Technical Requirements for Renewable Energy Systems Connected to the Low Voltage (LV) Network via Inverters

Transcription

1 Technical Requirements for Renewable Energy Systems Connected to the Low Voltage (LV) Network via Inverters Specification Number: HPC-9FJ

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3 CONTENTS 1 Introduction Context Definitions In Scope Reference Documentation Reference Documentation Order of Precedence Useful Links Relevant Sections For Each Class Of Renewable Energy System Installation General Requirements Compliance with Requirements Offsetting of Imported Energy Supply Characteristics Labelling Documentation Technical Requirements For Each Class Of Renewable Energy System Installation System Diagram Circuit Diagram Metering Inverters Smoothing Requirements Feed-in Management Requirements Zero-Export Requirements Sole Use Transformer Type testing Routine Testing Commissioning CS10# Page 3 of 58 Print Date 19/08/2014

4 Tables Table 1: Types of Generation Management... 7 Table 2: Definitions... 7 Table 3: Classes of Renewable Energy Installation Table 4: Renewable Energy Types Table 5: Connection Types Table 6: Reference Documentation Table 7: Order of Precedence (Highest to Lowest) Table 8: Useful Links Table 9: Relevant Sections for Each Class of Renewable Energy System Installation Table 10: Key Supply Characteristics Table 11: Prerequisites for Using System Diagram A not generation managed Table 12: Prerequisites for Using System Diagram B generation managed via Smoothing Table 13: Prerequisites for Using System Diagram C generation managed via Zero-Export Table 14: Prerequisites for Using System Diagram D generation managed via Feed-in Management Table 15: Passive Anti-islanding Protection Settings Table 16: Equipment Configuration Options Table 17: Types of Test Methods Table 18: Test Points Table 19: Frequency and validation of testing requirements for each test method Table 20: Action Required Once Test Result Obtained Table 21: Example Ramp Down Test Parameters Table 22: Example Ramp Down Test Data CS10# Page 4 of 58 Print Date 19/08/2014

5 Figures Figure 1: Total, Unmanaged, Managed Hosting Capacity & Generation Management (refer to section 1.2 for details)... 6 Figure 2: System Diagram A - not generation managed Figure 3: System Diagram B - generation managed via Smoothing Figure 4: System Diagram C - generation managed via Zero-Export Figure 5: System Diagram D - generation managed via Feed-in Management Figure 6 Circuit Diagram T Figure 7: Ramp Down Rate with and without Renewable Energy Smoothing Figure 8: Ramp Down Characteristic Curve Figure 9: Method of Control Set Point & On/Off - Integral with Inverter Figure 10: Method of Control Set Point & On/Off - Discrete Figure 11: Method of Control On/Off - Integral with Smart Meter Figure 12: Method of Control On/Off - Discrete Figure 13: Example of Ramp Down Test Measurements Where Result is TEST FAIL Figure 14: Example Ramp Down Test Results CS10# Page 5 of 58 Print Date 19/08/2014

6 1 INTRODUCTION 1.1 Context The purpose of this Document is to specify the minimum technical requirements for customers connecting a Renewable Energy System to Horizon Power s Low Voltage Network via inverters, regardless of whether such systems export electricity into the Electricity System or not. The Document aims to be technology agnostic and therefore allow the Customer and market to come up with the appropriate technology to suit the application. Horizon Power presently only allows connection of a fixed total amount of customer generated Renewable Source Electricity capacity to its Electricity System. This limit is known as hosting capacity and varies from town to town as it is set at a level that allows Horizon Power to technically and commercially deliver safe and reliable electricity. The hosting capacity can be constrained by technical and commercial considerations. Raising this limit to a higher level can be achieved through the use of Generation Management methods. Managed Hosting Capacity (MHC) Unmanaged Hosting Capacity (UHC) No Renewable Renewable Energy Systems with Generation Management Renewable Energy Systems without Generation Management Total Hosting Capacity (THC) Figure 1: Total, Unmanaged, Managed Hosting Capacity (refer to section 1.2 for details) Generation Management is a method by which the variable output of Renewable Source Electricity is either: (a) directly or by remote means controlled, curtailed, suspended, interrupted or in any way reduced; and/or (b) managed, either by means of electricity storage or by other electricity generation. CS10# Page 6 of 58 Print Date 19/08/2014

7 The three types of Generation Management applicable to this Document are described in Table 1. Table 1: Types of Generation Management Type of Generation Management Smoothing Feed-in Management Zero-Export Description Participating customers to install Energy Storage Devices that release energy back to the Electricity System to prevent system instability. Participating customers to allow Horizon Power to curtail the customer s generation output to prevent system instability. Participating customers to install Energy Control Devices that prevent export of energy onto the Horizon Power Electricity System. 1.2 Definitions In addition to those listed in AS/NZS 3000 and AS 4777, the following definitions apply: Table 2: Definitions Term ac Battery Current Transformer Customer Final Loads dc DNP3 Document Definition Alternating Current A device used to store energy in the form of chemical energy. A current transformer (CT) is used for measurement of alternating electric currents. All electrical loads on the Customer s premises not part of the Renewable Energy Installation Direct Current Communication protocol. Distribution Network Protocol version 3 This document and any annexed schedules, together with any document referred to, or incorporated into, this document. Electrical Installation As defined in section of AS 3000:2007 Energy Storage Device A generic device that stores energy in the form of electrical, mechanical or chemical energy. CS10# Page 7 of 58 Print Date 19/08/2014

8 Term Energy Analyser Electricity System Feed In Management (FiM) Generation Management (GM) Horizon Power Host Facility Hz Inverter kw Low Voltage Network LV Managed Hosting Capacity (MHC) Metering Equipment Definition An instrument for measuring various parameters of an electrical power distribution system, such as energy consumption and generation etc. The electricity network owned and operated by Horizon Power and connected to the Premises. A type of Generation Management. Participating customers to allow Horizon Power to curtail the customer s generation output to prevent system instability. Includes the utilisation of technologies such as energy storage or feed in management to control the output profile of the renewable energy installation. The Horizon Power or third party premises where equipment associated with Feed-in management may be situated. Hertz The device forming part of a System which: a) limits the Renewable Source Electricity exported to the Electricity System; b) complies with the Technical Requirements; c) may convert direct current generated electrical energy into alternating current electrical energy; and d) relates to the AS 4777 definition. Kilo Watts (10^3 Watts) Portion of the Electricity System that is nominally at low voltage. Low Voltage The hosting capacity that can be made available for systems equipped with Generation Management. As applicable, the import, export, bi-directional, parallel and revenue meters installed at the Premises to measure the import of electricity to the Customer under the Electricity Supply Agreement and the Renewable Electricity Exported by the Customer. CS10# Page 8 of 58 Print Date 19/08/2014

9 Term Mini Hydro MEN MW NPER PLC Premises Prosumer PV Energy Renewable Energy Producer Renewable Energy System Renewable Energy System Installation Renewable Energy Installation Control System Renewable Energy System Installation Size Renewable Source Electricity Definition A renewable generation source less than 1MW that creates electrical energy as a result of harnessing moving water. Multiple Earthed Neutral Mega Watts (10^6 Watts) National Professional Engineer Register Programmable Logic Controller The premises nominated in the Application Documents, owned or occupied by the Customer, which must be the same Customer supplied at that premises in accordance with an Electricity Supply Agreement. A Horizon Power customer that installs a renewable energy system to offset their energy consumption. A renewable generation source that creates electrical energy as a result of harnessing energy from the sun collected on photovoltaic cells. An entity whose primary purpose is to generate and sell renewable source electricity to Horizon Power. a) a system of photovoltaic arrays; b) a system of wind turbines; c) a hydro power system; or d) another system for the generation of electricity from a renewable energy source, that has a generating capacity exceeding 1.5 kw but not exceeding 1 MW unless otherwise agreed in writing by Horizon Power. Part of a Customer s Electrical Installation containing the devices listed in Section 5.1. Abbreviated to and interchangeable with Renewable Energy Installation (REI). One or more devices that perform control and monitoring of the Renewable Energy System Installation. The nominal output rating in kw of the grid connected inverter. Electricity generated by a Renewable Energy System. CS10# Page 9 of 58 Print Date 19/08/2014

10 Term REBS s SCADA Solar Thermal Energy Spinning Reserve System Instability System Diagram t TCP/IP Technical Requirements Total Hosting Capacity (THC) Unmanaged Hosting Capacity (UHC) V Western Power Wind Energy Zero Export Response Time Definition Renewable Energy Buyback Scheme Seconds Supervisory Control and Data Acquisition A renewable generation source that creates electrical energy as a result of harnessing sun energy focussed on thermal collectors. The amount of unused generating capacity synchronised to the network and available for immediate use. A disturbance to the Electricity System that affects the reliability and quality of electricity supply to customers. A conceptual diagram that illustrates the relationships between separate subsystems using lines. time Transmission Control Protocol/Internet Protocol This refers to the provisions set out in this Document. The limited capacity of the Electricity System to accept or manage the output of Renewable Source Electricity from a Customer s System whether because of a technical limitation, insufficient reserve generating capacity or otherwise or commercial limitation. The sum of the Unmanaged Hosting Capacity (UHC) and Managed Hosting Capacity (MHC). The limit for hosting or renewable energy without Generation Management. Volts Electricity Networks Corporation trading as Western Power. A renewable generation source that creates electrical energy as a result of harnessing moving air. Is the time spanning from the renewable energy export event detection to its effective reduction to a net zero export situation. CS10# Page 10 of 58 Print Date 19/08/2014

11 1.3 In Scope Installation Size of the Renewable Energy System This Document is applicable to the following Renewable Energy System Installation 1 sizes and general customer type, as defined by this Document: Table 3: Classes of Renewable Energy Installation Class Renewable Energy System Installation Size Customer Type Class 1 0 kw < REI Size 5 kw Prosumers only Class 2 5 kw < REI Size 50 kw Prosumers only Class 3 50 kw < REI Size 1 MW Prosumers only Renewable Energy Types This Document is applicable to the following renewable energy types: Table 4: Renewable Energy Types Type Renewable Energy System Installation Size Solar (PV, solar thermal) Wind Class 1, 2 & 3 Mini Hydro The Customer s Renewable Energy System Installation shall only generate one type of renewable energy. Other types of Renewable Energy System Installations may be used by prior written agreement with Horizon Power only Connection Types This Document is applicable to the following connection types: Table 5: Connection Types Connection Single Phase (Two Wire, 240 V a.c.) Three Phase (Four Wire - LV Connection Point, 415 V a.c.) The maximum single phase connection allowed is 10 kw. 1 Abbreviated and used interchangeably in this Document to Renewable Energy Installation (REI) CS10# Page 11 of 58 Print Date 19/08/2014

12 The size of the Renewable Energy System Installation may necessitate the upgrading of a Customer s connection. For key criteria of single and three phase connections, refer to the WA Distribution Connections Manual Balanced Generation The nominal inverter output rating of multi-phase Renewable Energy System Installations shall not differ by more than 2.5 kva between phases Eligibility This document is applicable to all customers who wish to connect a Renewable Energy System Installation for Renewable Source Electricity to a Horizon Power Electricity System. 2 REFERENCE DOCUMENTATION 2.1 Reference Documentation Unless otherwise stated within this Document, the Customer shall comply with the latest versions of the following: Table 6: Reference Documentation Australian Standards AS/NZS 3000 Electrical Installations (Wiring Rules) AS/NZS 3100 AS 4777 (all parts) Approval and Test Specification General Requirements for Electrical Equipment Grid Connection of Energy Systems via Inverters AS 5033 Installation of Photovoltaic Arrays 2 Legislation Electricity Industry Code Electricity Industry Metering Code Electricity Act 1945 WA Distribution Connections Manual Horizon Power and Other Documents WA Electrical Requirements 2 Only if Renewable Energy Installation contains photovoltaic arrays. CS10# Page 12 of 58 Print Date 19/08/2014

13 2.2 Order of Precedence In the event of a conflict arising between the reference documents listed in Table 6, the following order of precedence shall apply: Table 7: Order of Precedence (Highest to Lowest) Order Reference Document 1 Legislation 2 Technical Requirements 3 Australian Standards The Customer shall notify Horizon Power of any such conflict prior to undertaking work in relation to this Document. 2.3 Useful Links Table 8: Useful Links Name Clean Energy Council Horizon Power Western Power Approved Inverters Clean Energy Council Approved Inverters Link Accessed May 2014 (List subject to change) CS10# Page 13 of 58 Print Date 19/08/2014

14 3 RELEVANT SECTIONS FOR EACH CLASS OF RENEWABLE ENERGY SYSTEM INSTALLATION As described in section 1.3.1, the Customer s Renewable Energy System Installation is defined as being one of three classes. Depending on the class, different sections of this Document apply, as summarised in the table below. Table 9: Relevant Sections for Each Class of Renewable Energy System Installation Class Class 1 Relevant Sections of This Document All sections Class 2 All sections except Class 3 All sections except Note: if a system is Zero Export constrained 4, please also refer to section GENERAL REQUIREMENTS 4.1 Compliance with Requirements The Customer shall comply with all the requirements of this Document. Horizon Power may, in its absolute discretion and without limiting any of its other rights, reject an application or disconnect the Customer from the network if the Customer s Electrical Installation does not comply, or, no longer complies with all the requirements of this Document. 4.2 Offsetting of Imported Energy The Buyback product is provided on a net export basis. This means the Customer uses the Renewable Source Electricity to first offset the consumption of imported electricity from Horizon Power s Electricity System. Two scenarios to consider: Net-Export The excess of energy is able to be sold to Horizon Power Zero net-export The excess of energy is not able to be sold to Horizon Power if Zero-Export product applies 4 (see section 5.7) 4 To determine whether you will be Zero-Export constrained, refer to the Horizon Power website (Saving Energy>Renewable energy>quick Links) or contact Horizon Power directly. CS10# Page 14 of 58 Print Date 19/08/2014

15 4.3 Supply Characteristics The Customer s Electrical Installation shall be compatible with the characteristics of Horizon Power s supply as defined in Section 10 of WA Distribution Connections Manual. Table 10 below lists some key supply characteristics. Table 10: Key Supply Characteristics Parameter Value Single Phase Voltage 240 V a.c. +/- 6% Three Phase Voltage 415 V a.c. +/- 6% Frequency 50 Hz +/- 2.5% 4.4 Labelling Warning Labels shall be of the type and location specified in section 5.5 of AS Other labelling shall be as per AS/NZS Documentation Summary The following documentation shall be supplied by the Customer as part of its application: Application Form Compliance Checklist (SCHEDULE 1) System Diagram (SCHEDULE 2 Circuit Diagrams (SCHEDULE 3) Cable Data (SCHEDULE 4) NPER Signoff (SCHEDULE 5) Horizon Power may request additional information needed to perform a network impact assessment or to demonstrate that the Customer meets the requirements stated in this Document. This is particularly likely for larger installations that will require a more detailed assessment. Examples of the schedules to be submitted are included at the end of this Document Schedules to be submitted Schedule 1: Compliance Checklist A checklist comprising the key elements that needs to be satisfied in order to comply with this Document. Schedule 2: System Diagram A conceptual diagram, illustrating the functional relationships between key subsystems using solid lines. The Customer s System Diagram shall be in accordance with section 5.2 of this Document. CS10# Page 15 of 58 Print Date 19/08/2014

16 Schedule 3: Circuit Diagram One or more diagrams detailing the electrical connections from the point of connection through to the renewable energy source. The Customer s Circuit Diagram shall be in accordance with section 5.2 and the other requirements of this Document. The circuit diagram submitted to Horizon Power shall include: Electrical connections for all phases. Neutral and earth connections. Switchboard electrical connections (depiction of customer final loads not required). Electrical interconnection of all electrical elements of the Renewable Energy System Installation including inverters, energy storage devices, chargers, renewable energy sources, dc and ac protection devices etc. Schedule 4: Cable Data Data associated with power cables connecting the Customer s grid connected inverter to Horizon Power s electricity distribution system. This includes the consumer mains cable. Cable data to be provided includes: Location of cable in installation Number of cores Cross sectional area and insulation type Cable Length Method of installation (e.g. underground in conduit) The cables shall be depicted via one or more concept diagrams. Refer to example at the end of this Document. Schedule 5: NPER Signoff For Class 1 & 2 installations that require Generation Management (see Table 1), a NPER accredited engineer shall validate that the design is in accordance with this Document. An installer may reuse a NPER declaration for multiple installations providing the installations do not differ with the NPER validated reference design in the following elements: Make and model of inverters System Diagram Circuit Diagram (changes to protection and cable sizes permitted) Electrical arrangement of Renewable Energy System Installation Changes to firmware that affect compliance with this Document Changes to equipment that affect compliance with this Document Changes to the type of technology or methodology used to achieve compliance with this Document If a NPER declaration is reused, a cover letter shall be supplied stating: The project and date of the reference design That the new project does not differ from with the NPER validated design in the elements described above For every Class 3 installation, a NPER accredited engineer shall validate that the design is in accordance with this Document and provide supporting documentation. NPER accreditation for Class 3 Installations cannot be reused. CS10# Page 16 of 58 Print Date 19/08/2014

17 5 TECHNICAL REQUIREMENTS FOR EACH CLASS OF RENEWABLE ENERGY SYSTEM INSTALLATION This section outlines the Technical Requirements and System Diagram to be used for different types of renewable energy systems. The following criteria shall be employed to determine which System Diagram applies to each type of renewable energy system: Note (1) Customers on A2, C2, D2 tariffs or an educational institution are REBS eligible. CS10# Page 17 of 58 Print Date 19/08/2014

18 5.1 System Diagram A system diagram is a conceptual diagram that illustrates the functional relationships between key subsystems using solid lines. The lines do not represent wiring, rather energy flows between subsystems 5. Details such as intermediary protection devices, chargers, internal device connections, switches and links are not displayed on the provided system diagrams. The Customer s Electrical Installation shall be in accordance with one of the following system diagrams: System Diagram A System Diagram B System Diagram C System Diagram D Common elements to all four system diagrams include, but are not limited to: A single point of connection between the Customer s Electrical Installation and Horizon Power s Low Voltage Network Splitting of the Customer s Electrical Installation into the following elements: - Renewable Energy System Installation - Customer Final Loads - One or more switchboards - Meters The Renewable Energy System Installation may include, but is not limited to the following devices: - Renewable Energy Sources (e.g. photovoltaic cells, wind turbine) - Grid Connected Inverter - Other Inverters (if required) - Chargers - Grid Protection Devices - Energy Storage Devices (e.g. battery bank) - Feed in Management Devices - Associated control, monitoring, protection and auxiliary equipment Final Customer Loads (if present) - Final Customer Loads requiring energy (e.g. washing machine, television, motors, pumps etc.) - Associated control, monitoring, protection and auxiliary equipment 5 Refer to section 5.2 for an acceptable circuit diagram detailing the specific wiring that must be performed. CS10# Page 18 of 58 Print Date 19/08/2014

19 5.1.1 System Diagram A: Not Generation Managed The Customer s Electrical Installation shall be in accordance with System Diagram A (Figure 2), providing all the prerequisites described in Table 11 are met. Table 11: Prerequisites for Using System Diagram A Not Generation Managed Class Tariff Requirement Class 1 Customer is on A2, C2, D2 tariff or is an educational institution (i.e. eligible for REBS) Eligible to use System Diagram A Town has unmanaged hosting capacity 6 Class 2 Class 3 Not eligible to use System Diagram A Not eligible to use System Diagram A CUSTOMER ELECTRICAL INSTALLATION CUSTOMER RENEWABLE ENERGY INSTALLATION Switchboard(s) Renewable Energy Source Grid Connected Inverter Meter HP NETWORK CUSTOMER FINAL LOADS Final Loads Figure 2: System Diagram A - Not Generation Managed Key elements of System Diagram A are: No Generation Management measures are required No Energy Storage Devices are permitted as part of the Customer s Renewable Energy Installation. Use of one meter. 6 To determine whether your town has Unmanaged Hosting Capacity, refer to the Horizon Power website (Saving Energy>Renewable energy>quick Links) or contact Horizon Power directly. CS10# Page 19 of 58 Print Date 19/08/2014

20 5.1.2 System Diagram B: Generation Managed via Smoothing The Customer s Electrical Installation shall be in accordance with System Diagram B (see Figure 3), providing the prerequisites described in Table 12 are met. Table 12: Prerequisites for Using System Diagram B Generation Managed via Smoothing Class Tariff Requirement Class 1 Customer is on A2, C2, D2 tariff or is an educational institution (i.e. eligible for REBS) Eligible to use System Diagram B All other customer tariffs except M2 (i.e. not eligible for REBS) Eligible to use System Diagram B Town has Managed Hosting Capacity 7. Subject to offer availability 8 Class 2 Any customer tariff except M2 Subject to offer availability 8 Eligible to use System Diagram B Class 3 Any customer tariff except M2 Subject to offer availability 8 Eligible to use System Diagram B 7 To determine whether your town has Managed Hosting Capacity, refer to the Horizon Power website (Saving Energy>Renewable energy>quick Links) or contact Horizon Power directly. 8 To determine the offer availability, contact Horizon Power directly. CS10# Page 20 of 58 Print Date 19/08/2014

21 CUSTOMER ELECTRICAL INSTALLATION CUSTOMER RENEWABLE ENERGY INSTALLATION Switchboard(s) Renewable Energy Source Grid Connected Inverter Meter HP NETWORK Energy Storage Smoothing Subsystem CUSTOMER FINAL LOADS Final Loads Figure 3: System Diagram B - Generation Managed via Smoothing CS10# Page 21 of 58 Print Date 19/08/2014

22 Key elements of System Diagram B (see Figure 3) are: Use of Renewable Energy Smoothing. Requirement for Energy Storage devices to be installed either on the dc or ac side of the grid connected inverter or other intermediary devices. No direct connection is permitted between the Customer s Renewable Energy Installation and Customer Final Loads. Connection must be made via the switchboard. Use of one meter. Note: the smoothing subsystem may be integral or separate with the grid connected inverter System Diagram C: Generation Managed via Zero-Export The customer s Electrical Installation shall be in accordance with System Diagram D (Figure 4), providing all the prerequisites described in Table 13 are met. Table 13: Prerequisites for Using System Diagram C Generation Managed via Zero-Export Class Tariff Requirement Class 1 Customer is on A2, C2, D2 tariff or is an educational institution (i.e. eligible for REBS) Not eligible to use System Diagram C Town has managed hosting capacity 9. Any customer tariff except M2 Subject to offer availability 10 Eligible to use System Diagram C Class 2 Any customer tariff except M2 Subject to offer availability 10 Eligible to use System Diagram C Class 3 Any customer tariff except M2 Subject to offer availability 10 Eligible to use System Diagram C 9 To determine whether your town has Zero Export Managed Hosting Capacity, refer to the Horizon Power website (Saving Energy>Renewable energy>quick Links) or contact Horizon Power directly. 10 To determine offer availability contact Horizon Power directly. CS10# Page 22 of 58 Print Date 19/08/2014

23 CUSTOMER ELECTRICAL INSTALLATION CUSTOMER RENEWABLE ENERGY INSTALLATION Switchboard(s) Renewable Energy Source Grid Connected Inverter Meter HP NETWORK Energy Storage Smoothing Subsystem Zero Export Subsystem CUSTOMER FINAL LOADS Final Loads Figure 4: System Diagram C - Generation Managed via Zero-Export Key elements of System Diagram C are: Use of a Zero Export and Smoothing devices (see section 5.1.2). Requirement for Energy Storage devices to be installed either on the dc or ac side of the grid connected inverter or other intermediary devices. Use of one meter. Note: the Zero Export device might be integral or separate with the grid connected inverter. CS10# Page 23 of 58 Print Date 19/08/2014

24 5.1.4 System Diagram D: Generation Managed via Feed-in Management The Customer s Electrical Installation shall be in accordance with System Diagram D (see Figure 5), providing the prerequisites described in Table 14 are met. Table 14: Prerequisites for Using System Diagram D Generation Managed via Feed-in Management Class Tariff Requirement Class 1 Customer is on A2, C2, D2 tariff or is an educational institution (i.e. eligible for REBS) Not Eligible to use System Diagram D All other customer tariffs except M2 (i.e. not eligible for REBS) Eligible to use System Diagram D NA Subject to offer availability 11 Class 2 Any customer tariff except M2 Subject to offer availability 11 Eligible to use System Diagram D Class 3 Any customer tariff except M2 Subject to offer availability 11 Tariff is Independent Power Producer (IPP) 12 application is not for an existing Horizon Power connection By negotiation 13 Eligible to use System Diagram D 11 To determine offer availability and if feed-in management applies, contact Horizon Power directly. 12 Independent Power Producers (IPP) are applicants who wish to install a large renewable energy system (typically greater than 200 kw) with the intention of supplying the energy they produce back to Horizon Power as a power producer. 13 Negotiated Power Purchase Agreement (PPA) Horizon Power directly. CS10# Page 24 of 58 Print Date 19/08/2014

25 CUSTOMER ELECTRICAL INSTALLATION CUSTOMER RENEWABLE ENERGY INSTALLATION Switchboard(s) Renewable Energy Source Grid Connected Inverter Meter HP NETWORK Energy Storage Smoothing Subsystem Feed In Management Subsystem HP CONTROL SYSTEM CUSTOMER FINAL LOADS Final Loads Figure 5: System Diagram D - Generation Managed via Feed-in Management Key elements of System Diagram D are: Use of Feed-in Management. and Smoothing devices (see section 5.1.2). Requirement for Energy Storage devices to be installed either on the dc or ac side of the grid connected inverter or other intermediary devices. Direct communication required between the Customer s Electrical Installation and Horizon Power s Control System. No direct connection is permitted between the Customer s Renewable Energy Installation and Customer Final Loads. Connection must be made via the switchboard. Use of one meter. Note: the feed-in management subsystem may be integral or separate with the grid connected inverter. CS10# Page 25 of 58 Print Date 19/08/2014

26 5.2 Circuit Diagram The circuit diagram in this section describes the allowable electrical connections required between the Customer s Main Switchboard, Renewable Energy Installation, Final Loads and Horizon Power Meter for both single and three phase connections. The Customer shall perform wiring in accordance with Circuit Diagram T. As per Circuit Diagram T electrical connections within the Customer s Renewable Energy Installation are not shown. The Customer shall rely on the other requirements of this Document together with AS , AS/NZS 3000, AS 5033 (PV only) and other applicable documents to connect the internal components of Renewable Energy Installation correctly Circuit Diagram T HP NETWORK 1ph or 3ph A N POINT OF CONNECTION CUSTOMER SWITCHBOARD METER FUSE HORIZON POWER METER Neutral Link N Main Earth MEN Earth Link To Customer Renewable Energy Installation* N A INVERTER MAIN SWITCH & OVER CURRENT PROTECTION RCD MAIN SWITCH RCD A To Customer Final Loads Figure 6 Circuit Diagram T * For further wiring requirements for electrical connection of the Customer s Renewable Energy Installation, refer to other requirements in this document, AS , AS/NZS 3000 and AS 5033 (PV only). A= Active, N = Neutral, MEN = Multiple Earthed Neutral, RCD = Residual Current Device CS10# Page 26 of 58 Print Date 19/08/2014

27 5.2.2 Photovoltaic Installations Within the Customer s Renewable Energy System Installation, Photovoltaic installations shall comply with Australian Standard AS 5033 Installation of Photovoltaic (PV) Arrays Modification Due To Larger Installations At Horizon Power s discretion, larger or rural installations may require modifications to the Circuit Diagram T to facilitate metering. 5.3 Metering Approved Meters Only Horizon Power approved bi-directional meters shall be used for each circuit diagram and connection type. If the customer has existing non-conforming meters, then they must be replaced Supply The meter shall be supplied by Horizon Power Approved Installers The meter shall be installed by an installer approved by Horizon Power Programming The meter shall be pre-programmed by Horizon Power Installation The meters shall be installed in accordance with section 11 of the WA Distribution Connections Manual Upgrading of Enclosure In order to meet the meter installation requirements of section 11 of the WA Distribution Connections Manual, the Customer may have to upgrade the enclosure where the meters are housed, typically due to space constraints Measurement of Meters Horizon Power shall perform measurements in accordance with the Metering Code and Horizon Power Metrology Procedures Cost of Metering The cost of materials and installation of meters shall be borne by the Customer in accordance with the customer's Buyback Contract. This includes the cost of upgrading of enclosures and switchboard if required. CS10# Page 27 of 58 Print Date 19/08/2014

28 5.4 Inverters Number of Inverters Horizon Power requires the Customer to install one or more inverters in order to convert Renewable Source Electricity into a form that is able to be exported from the Customer s Renewable Energy System Installation to Horizon Power s Low Voltage Network. The Customer shall connect their Renewable Energy System Installation to the Switchboard via one or more Inverters. The connection shall be via one or more grid protection devices and circuit breakers which may be integral with the inverter, in accordance with AS Approved Inverters The Grid-connected Inverter model shall comply with the following standards: AS 4777 AS 3100 The Grid-connected Inverter model shall: Be on Western Power s list of approved Inverters; and/or both: i) have a certificate of compliance with AS 4777 from a NATA recognised laboratory; and ii) be on the Clean Energy Council s approved list of Inverters; Export Only The Renewable Energy System Installation shall not be able to import power from Horizon Power s Electricity System to charge Energy Storage Devices. The Renewable Energy System Installation shall be resistant to tampering that enables direct energy importation to charge energy storage devices. If bidirectional inverters are used, the Renewable Energy System Installation shall be prevented from importing power from Horizon Power s Electricity System to charge Energy Storage Devices, by one or more of the following methods: An physical device; A software interlock; or By the nature of the design. Any method used shall be tamper resistant. Horizon Power reserves the right to permanently exclude an Inverter make and model from connection to its Electricity System if it considers (in its absolute discretion) that the method used to prevent energy import is not satisfactory. CS10# Page 28 of 58 Print Date 19/08/2014

29 5.4.4 Passive Anti-islanding Protection Settings Passive Anti-islanding protection shall be as per section 5.3 of AS The Grid-connected Inverter shall be installed with the following passive anti-islanding settings prior to energisation: Table 15: Passive Anti-islanding Protection Settings Parameter Value Definition fmin 46.5 Hz Refer section 5.3 of AS fmax 53 Hz Vmin Vmax 190 V 265 V The settings may either be pre-set or programmable. The programming of the setting shall not be easily changed and preferably be done internally within the inverter or protected by a password. Horizon Power may request changes to the above settings prior to energisation Permission to Export The grid connected Inverter shall be prevented from exporting power until the Energy Storage Devices have sufficient energy stored to meet the ramp rate requirements described in section 5.5. Note: this clause does not apply for Zero-Export To determine whether you are Zero-Export constrained, refer to the Horizon Power website or contact Horizon Power directly. CS10# Page 29 of 58 Print Date 19/08/2014

30 5.5 Smoothing Requirements Concept Controlling the ramp rate of the Inverter output is a requirement of the Renewable Energy Smoothing type of Generation Management. As described in Table 1, Renewable Energy Smoothing requires the Customer to install Energy Storage Devices that release energy back to the Electricity System over a period of time if the Renewable Source Electricity output changes too suddenly (Figure 7). This allows enough time for Horizon Power and Independent Power Producers to ramp up their generation assets to cover for a loss in Customer generation. Power O0 Ramp Down Rate Too High Maximum Allowable Ramp Down Rate Oss Cloud Event Key Renewable Energy Source Output Power Inverter Output Power with Renewable Energy Smoothing Inverter Output Power without Renewable Energy Smoothing Losses Time Steady State: Inverter Output Power Renewable Energy Source Output Power - Losses Figure 7: Ramp Down Rate with and without Renewable Energy Smoothing Characteristic Curve Figure 8 below plots the characteristic curve of the output power of a grid connected Inverter. The characteristic curve is defined as the desired output behaviour of the grid connected inverter, initially operating at nominal rated output, in response to a step change in renewable energy source output at time t = 0 seconds to 0 kw. CS10# Page 30 of 58 Print Date 19/08/2014

31 Power [kw] On Rn = * On / Tn [W/s] NL = 100 * / Tn [%] Key Renewable Energy Source Output Power Inverter Output Power with Renewable Energy Smoothing Linearity Bounds Losses Tn Time [s] Parameters Rn := Nominal Ramp Down Rate [W/s] Tn := Nominal Ramp Down Time [s] On := Nominal Rated Inverter Output [kw] := Maximum Input Deviation [s] NL := Percentage Non-linearity [%] Figure 8: Ramp Down Characteristic Curve Nominal Ramp Down Time All Renewable Energy System Installations employing System Diagrams B or C shall have a nominal ramp down time Tn of 720 seconds. The nominal ramp down time is depicted Figure 8 and is defined as the time taken for the inverter to ramp down from nominal rated output to 0 kw. The nominal ramp down rate for each installation size is then derived according to the equation shown in Figure 8. Control action is required when the ramp down rate of the renewable energy source exceeds Rn in magnitude. CS10# Page 31 of 58 Print Date 19/08/2014

32 5.5.4 Nominal Ramp Up Time All Renewable Energy Installations employing System Diagrams B or C shall have a nominal ramp up time Tp of 360 seconds. The nominal ramp up time Rp is defined as the time taken for the inverter to ramp up from 0 kw to nominal rated output: Rp = 1000 * On / Tp [W/s] This covers for a sudden increase in Renewable Source Electricity output. It is expected that during this type of control action that the Energy Storage Devices would be absorbing energy. Control action is required when the ramp up rate of the renewable energy source exceeds Rp in magnitude Non Linearity The non-linearity of the ramp rate of the inverter output, as defined by the Characteristic Curve depicted in Figure 8 shall be less than 10% Type and Size of Energy Storage Devices The ramp rate requirements describe the required output behaviour of the inverter only. The type of Energy Storage Devices used together with the control algorithm, trigger condition and associated devices is left for the Customer to determine Testing The Renewable Energy System Installation shall be considered to have met the ramp down requirements if it passes a ramp down test described in section 5.9. CS10# Page 32 of 58 Print Date 19/08/2014

33 5.6 Feed-in Management Requirements Feed-in Management is requirement of Renewable Energy Installations that meet the prerequisites described in Table Class 2 Renewable Energy Installations Functional Requirements The Feed-in Management subsystem for class 1 & 2 Renewable Energy installations shall include: Communication between the Renewable Energy System and Horizon Power via Horizon Power s Advanced Metering Infrastructure. Direct control and status indication over the inverter isolation circuit breaker or electronic isolator. At Horizon Power s absolute discretion, the Feed-in Management subsystem for class 1 & 2 Renewable Energy installations may also include: Control over, and regulation of the output of the grid connected inverter including: - Instantaneous active power set point control (within 15 s from signal transmission). - Reactive power set point control (+0.85 to control with 60 s response from signal). - Facility for automated system ramp down on loss of the communications link. - Instantaneous set point control of energy storage (within 15 s from signal transmission). Access to live on site generation resource data (e.g. solar irradiation data, wind speed & direction data etc.). Access to live inverter data Horizon Power Scope Horizon Power shall: Supply, install, own and maintain the Advanced Metering Infrastructure associated with the Feed-in Management subsystem. Assist the customer to commission their Feed-in Management sub system Perform control and monitoring CS10# Page 33 of 58 Print Date 19/08/2014

34 Zigbee Customer Scope The Customer shall: Provide suitable control and monitoring inputs to Horizon Power s communication channel in order to fulfil the functional requirements described in section Supply, install and commission the feed-in management sub system, liaising with Horizon Power as required Equipment Given the functional requirements described in section , the following equipment configurations are possible: Table 16: Equipment Configuration Options Method of Control Integral/Discrete Equipment Configuration Set Point & On/Off Integral with Inverter Figure 9 Set Point & On/Off Discrete Figure 10 On/Off Integral with Smart Meter Figure 11 On/Off Discrete Figure 12 CUSTOMER HORIZON POWER Smart Meter Inverter Zigbee Head End System Custom Control System SCADA System Internal Wireless Hardwired Figure 9: Method of Control Set Point & On/Off - Integral with Inverter In this equipment configuration, the inverter can be turned on or off or curtailed to a set point by using the ZigBee interface within the dual element smart meter. The smart meter communicates to the compliant ZigBee enabled inverter. CS10# Page 34 of 58 Print Date 19/08/2014

35 CUSTOMER HORIZON POWER Smart Meter Inverter Zigbee setpoint control device Zigbee Head End System Custom Control System SCADA System Internal Wireless Hardwired Figure 10: Method of Control Set Point & On/Off - Discrete In this equipment configuration, the inverter can be turned on or off or curtailed to a set point by using the ZigBee interface within the dual element smart meter. The smart meter communicates to the compliant ZigBee enabled inverter. The smart meter communicates with a third party ZigBee device connected in series with the inverter. CUSTOMER HORIZON POWER Smart Meter Inverter Load Control Switch Head End System Custom Control System SCADA System Internal Wireless Hardwired Figure 11: Method of Control On/Off - Integral with Smart Meter In this equipment configuration, the inverter can be turned on or off by using the load control relay within the dual element smart meter. Curtailment to set points is not possible in this arrangement. CS10# Page 35 of 58 Print Date 19/08/2014

36 CUSTOMER HORIZON POWER Smart Meter Inverter Zigbee load control device Zigbee Head End System Custom Control System SCADA System Internal Wireless Hardwired Figure 12: Method of Control On/Off - Discrete In this equipment configuration, the inverter can be turned on or off by using the ZigBee interface within the dual element smart meter. The smart meter communicates with a third party ZigBee device connected in series with the inverter which performs the disconnect function. Curtailment to set points is not possible in this arrangement. Note: Further specification of the equipment will need to be performed once the advanced metering infrastructure has been chosen and deployed by Horizon Power. CS10# Page 36 of 58 Print Date 19/08/2014

37 5.6.2 Class 3 Renewable Energy Installations Functional Requirements The Feed-in Management subsystem shall: Include an active communication channel to a location specified by Horizon Power (known as the Host Facility). Include a status indicator on the communications channel. Provide Horizon Power with remote control over, and regulation of the output of the grid connected inverter including: - Instantaneous active power set point control (within 15 sec from signal transmission). - Reactive power set point control (+0.85 to control with 60 sec response from signal). - Direct control and status indication over the main LV system isolation circuit breaker. - Facility for automated system ramp down on loss of the communications link. Provide Horizon Power with full unrestricted access to the SEL-735 model Power Quality and Revenue meter. Provide Horizon Power with access to live on site generation resource data (e.g. solar irradiation data, wind speed & direction data etc.). Provide Horizon Power with live access to the Customer s Renewable Energy Installation for monitoring purposes in order to maintain system quality reliability and stability Horizon Power Scope Horizon Power shall: Supply, install, own and maintain the communications channel associated with the Feed-in Management subsystem. This includes any associated equipment, cables, cabinets and systems. Perform system integration associated with connecting the Customer s Feed-in Management subsystem to Horizon Power s Control System. CS10# Page 37 of 58 Print Date 19/08/2014

38 Customer Scope The Customer shall: Provide suitable control and monitoring inputs to Horizon Power s communication channel in order to fulfil the functional requirements described in section Provide a suitable location on the Customer s side for Horizon Power s equipment associated with the Feed-in Management subsystem. Provide Single Phase 240 V AC power to Horizon Power s equipment cabinets on the Customer s side. Provide Horizon Power with autonomous entry level access to the Renewable Energy Installation in order to perform up front and ongoing works Equipment The Feed-in Management subsystem shall comprise the following components: Customers Renewable Energy Installation A transceiver, installed by Horizon Power at the Customer s Renewable Energy Installation. A SEL-735 power quality and revenue meter with additional I/O module for CB status and fault indication, installed by Horizon Power at the Customer s Renewable Energy Installation. Associated control and monitoring devices needed to meet the functional requirements described in section installed by Horizon Power at the Customer s Renewable Energy Installation. One or more cabinets to house the above components. CS10# Page 38 of 58 Print Date 19/08/2014

39 5.7 Zero-Export Requirements Zero-Export is requirement of Renewable Energy Installations that meet the prerequisites described in Table Technical Requirements The Energy Control subsystem shall: Ensure export of active power to Horizon Power Network within following limits - 0 kw - response time 15 : max. 5 s Use communication media, interfaces and protocols ensuring interoperability of components in the subsystem to meet above performance requirements. Meet the service life of the renewable energy system. Be resistant to outdoor harsh stresses (rain, wind, UV etc.). Comply with applicable Australian standards. Be tamper-proof (enclosure and settings) Equipment Current 16 Zero-Export Energy Control Subsystems include but are not limited to: Inverter Disconnect Systems that disconnect the renewable energy installation if the instantaneous generation exceeds the instantaneous load. Inverter Output Reducer Systems that control the instantaneous generation to ensure it does not exceed the instantaneous load. Energy storage devices that store the excess of energy (separate or integral of the inverter). 15 Is the time spanning from the renewable energy export event detection to its effective reduction to a net zero export situation. 16 Accessed May 2014 (list subject to change) CS10# Page 39 of 58 Print Date 19/08/2014

40 5.8 Sole Use Transformer As an outcome of the application Horizon Power may require the Customer to be supplied from a sole use transformer in order to maintain the reliability of the Electricity System 17. The Customer shall bear Horizon Power s costs of supplying and installing a sole use transformer. 5.9 Type Testing For installations where Renewable Energy Smoothing is required, Horizon Power needs to be able to verify whether a Customer s Renewable Energy Installation complies with ramp down requirements specified in section 5.5. This is achieved by the validation of an NPER accredited engineer that the Renewable Energy Smoothing system is in accordance with the ramp down testing requirements specified in section Routine Testing Validation is achieved by Horizon Power certifying on a periodic basis that the ramp rate requirements are being met Testing Method The testing method shall be one of the following: Table 17: Types of Test Methods Test Method Pushbutton 18 Self-Test Battery Health Indicator 19 Description A pushbutton is pressed which initiates a test sequence that results in a PASS or FAIL. An indicator guaranteeing the health of the battery system and showing there is sufficient capacity in the battery system to perform the test sequence 17 This is expected to be more of an issue for large Class 3 installations. 18 A pushbutton may be a multifunction, accessible by menus or dedicated button 19 Must be clearly visible to a meter reader CS10# Page 40 of 58 Print Date 19/08/2014

41 Ramp Down Testing Procedure Figure 13 illustrates the test requirements. In addition, an example of test measurements is contained in Appendix A. Power [kw] On NOT TO SCALE O0 = K*On Outside of Pass Bounds 0.1KTn 0.3KTn 0.5KTn 0.7KTn 0.9KTn Tn Time t [s] Key Renewable Energy Source Output Power Desired Inverter Output Power Ramp Down Curve Linearity Bounds (Pass Bounds) Losses Measured Value Tn On O0 K Parameters := Nominal Ramp Down Time [s] := Nominal Rated Inverter Output [kw] := Measured Inverter t=0 [kw] := O0 / On [units] Figure 13: Example of Ramp Down Test Measurements Where Result is TEST FAIL Procedure: 1. Measure inverter output power prior to commencement of test, O0 Let On be the nominal output rating of the grid connected inverter Let K = O0 / On If K < 0.4 abort test Determine 5 test points and the pass bounds for each power measurement 20 The best time to perform the test is during peak output (typically. 12-2pm) CS10# Page 41 of 58 Print Date 19/08/2014

42 Table 18: Test Points Measuring Time Power Measurement Pass Bounds Lower Upper 0.1 KTn 0.8 KOn KOn 0.3 KTn 0.6 KOn 0.8 KOn 0.5 KTn 0.4 KOn 0.6 KOn 0.7 KTn 0.2 KOn 0.4 KOn 0.9 KTn KOn 3. Electrically isolate the renewable energy source from the rest of the Renewable Energy Installation Start timer. 5. Record measured inverter output value Omeasured at each test point specified in step If all five measured output values Omeasured are within the pass bounds specified in step 2 then TEST PASSED, else TEST FAILED 7. Indicate Status 8. If TEST FAILED disconnect inverter from grid according to section If TEST PASSED, allow permanent connection to the grid to section Reconnect the renewable energy source to the rest of the Renewable Energy Installation. 11. Test Complete Measurement Accuracy Each measured value shall be accurate to within 4% and with repeatability of 2%. Measurements that lie outside the pass bounds but within measurement uncertainty bounds shall be considered passed. 21 This could be done by sending an energising signal to a relay that actuates the DC breaker immediately upstream of the renewable energy source. CS10# Page 42 of 58 Print Date 19/08/2014

43 Recording of Data Test data shall be stored in an electronic format that guards against tampering. Data associated with the previous 12 ramp down tests shall be able to be stored. Data shall include: Date and time of test. Test result: Pass or Fail. Five test measurement values. Values of K, Tn, O0, On at the time of the test Frequency and Validation of Testing Horizon Power requires evidence of compliance ( Certification ) with the ramp down requirements on an annual basis. This will involve Horizon Power personnel visiting the Customer s premises and performing one of the following tasks: Reading of battery health indicator Reading of a conducted pushbutton self-test Table 19 summarises the test frequency requirements. Table 19: Frequency and validation of testing requirements for each test method Method Pushbutton Self-Test Horizon Power Certification Frequency Annually Battery health indicator visualisation Action on Test Completion If disconnected, the customer shall connect their Renewable Energy System Installation to Horizon Power s Electricity System for the purposes of conducting the ramp down test. This is a temporary connection only. The table below describes the action required once a test result is obtained. Table 20: Action Required Once Test Result Obtained Method Action on TEST FAIL Action on TEST PASS Pushbutton Self-Test Battery Health Indicator Automatic Disconnection of Inverter. Permanent Connection of REI to Horizon Power Network not allowed and prevented by software interlock. Conduct a Pushbutton Self- Test Permanent Connection of REI to HP Network now allowed NA CS10# Page 43 of 58 Print Date 19/08/2014

44 5.11 Commissioning Commissioning and verification shall be in accordance with section 8 of AS 3000, AS 5033 (if applicable), WA Distribution Connections Manual, WA electrical requirements and manufacturer recommendations. In addition, if applicable, the Customer shall perform a ramp down test prior to the commencement of use. Horizon Power reserves the right to witness commissioning or request evidence of commissioning results prior to granting final approval. Renewable Energy System Installations that employ Feed In Management will require the involvement of Horizon Power personnel as part of the commissioning process. CS10# Page 44 of 58 Print Date 19/08/2014

45 APPENDIX A. EXAMPLE OF RAMP DOWN TEST Table 21: Example Ramp Down Test Parameters Description Parameter Value Nominal Rated Inverter Output On 5 kw Nominal Ramp Down Time Tn 300 s 22 Initial Inverter Output O0 3.5 kw Calculated Scaling Constant K 0.7 Measurement Error ε 4% Table 22: Example Ramp Down Test Data Test Point Measuring Time [s] Power Measurement Pass Bounds Lower [kw] Upper [kw] O measured [kw] Result t t t t t OVERALL TEST RESULT: FAIL 3.2 [ ] 2.40 [ ] 1.0 [ ] 0.90 [ ] 0.40 [ ] PASS PASS FAIL PASS PASS 22 Note that the standard specifies a different nominal ramp down time CS10# Page 45 of 58 Print Date 19/08/2014

46 4.5 Ramp Down Test Results Inverter Output [kw] Lower Pass Bound Upper Pass Bound Measured Time [s] Figure 14: Example Ramp Down Test Results CS10# Page 46 of 58 Print Date 19/08/2014

47 APPENDIX B. TYPICAL FEED-IN MANAGEMENT COMMUNICATIONS BLOCK DIAGRAM CS10# Page 47 of 58 Print Date 19/08/2014

48 SCHEDULES The following Schedules shall be submitted to Horizon Power by the Customer as part of their application: SCHEDULE 1 Customer Compliance Checklist (typical shown below) SCHEDULE 2 System Diagram (typical shown below) SCHEDULE 3 Circuit Diagram (typical shown below) SCHEDULE 4 Cable Data (typical shown below) SCHEDULE 5 NPER Signoff (typical shown below) CS10# Page 48 of 58 Print Date 19/08/2014

49 SCHEDULE 1. CUSTOMER COMPLIANCE CHECKLIST Description Relevant Complies Comments Clauses Renewable Energy Installation Size and Type Connection Types Reference Documentation 2 General Requirements Compliance with Requirements 4.1 General Requirements Supply Characteristics 4.3 General Requirements Labelling 4.4 General Requirements Documentation 4.5 System Diagram 5.1 Circuit Diagram 5.2 Metering 5.3 Inverters - Number Inverters Approved Inverters Inverters Export Only CS10# Page 49 of 58 Print Date 19/08/2014

50 Inverters Passive Anti-islanding Protection Settings Inverters Permission to Export Ramp Rate Characteristic Curve Ramp Rate Non Linearity Ramp Rate Nominal Ramp Down Time Ramp Rate - Testing Feed In Management- Functional Requirements Feed In Management- Customer Scope Routine Testing Testing Procedure Routine Testing Testing Procedure 5.10 Routine Testing Measurement Accuracy Routine Testing Frequency & Validity of Testing Routine Testing Action on Test Completion Commissioning 5.11 CS10# Page 50 of 58 Print Date 19/08/2014

51 SCHEDULE 2. SYSTEM DIAGRAM *****SAMPLE ONLY**** CUSTOMER ELECTRICAL INSTALLATION CUSTOMER RENEWABLE ENERGY INSTALLATION Switchboard(s) Renewable Energy Source Grid Connected Inverter Meter HP NETWORK Smoothing Subsystem CUSTOMER FINAL LOADS Final Loads CS10# Page 51 of 58 Print Date 19/08/2014

52 SCHEDULE 3. CIRCUIT DIAGRAM *****SAMPLE ONLY**** SHEET 1 HP NETWORK Single Phase 240V a.c A N POINT OF CONNECTION MAIN SWITCHBOARD METER FUSE HORIZON POWER METER Neutral Link N Main Earth MEN Earth Link { To Renewable Energy Installation (SHEET 2) N A INVERTER MAIN SWITCH & OVER CURRENT PROTECTION (rating) MAIN SWITCH (rating) A To Customer Final Loads CS10# Page 52 of 58 Print Date 19/08/2014

53 (schedule 3 continued) *****SAMPLE ONLY**** SHEET 2 (no of strings, cells per string, Power per cell) PV ARRAY PV ARRAY ISOLATOR (d.c) (rating) INVERTER 1 (with grid protection device) BATTERY CB (d.c) (rating) pv+ pv- pv+ pvbatt+ batt- E N A INVERTER LOCAL ISOLATOR (a.c) (rating) }From Main Switchboard (SHEET 1) Battery (Voltage, Ampere-Hours) CS10# Page 53 of 58 Print Date 19/08/2014

54 SCHEDULE 4. CABLE DATA *****SAMPLE ONLY**** CONCEPT DRAWINGS (SAMPLE): 3 1 HORIZON POWER POLE CUSTOMER POLE MAIN SWITCHBOARD & METER INVERTER 2 PROPERTY BOUNDARY Property Boundary HORIZON POWER POLE 3 CUSTOMER POLE 2 MAIN SWITCHBOARD/ METER BOX 1 INVERTER RENEWABLE ENERGY SOURCE CS10# Page 54 of 58 Print Date 19/08/2014

55 (schedule 4 continued) ****NOTE: Include cable information for all power cables between Inverter and Point of Supply**** Concept Drawing Item Cable Length Cable Type Installation type 1 10 m 4 mm 2, 2 Core + Earth, PVC/PVC, Copper In Roof Space 2 20 m 4 mm 2, 2 Core, PVC/PVC, Copper Underground 3 30 m 4 mm 2, 2 Core, Bare, Copper Overhead CS10# Page 55 of 58 Print Date 19/08/2014

56 SCHEDULE 5. NPER SIGNOFF *****SAMPLE ONLY: NEW REFERENCE DESIGN**** Horizon Power 18 Brodie Hall Drive Technology Park Bentley, WA, 6102 Your Ref: XXXXXX Our Ref: YYYYYY (if applicable) DD/MM/YY Dear Sir/Madam Subject: Renewable Energy Connection - Project Name, Project Location Please find attached our submission for the abovementioned project. This letter is to certify that as a Chartered Professional Engineer and by virtue of my training and experience, the submission documentations issued together with this letter complies with the requirements of the following: HPC-9FJ Horizon Power Technical Requirements for Connection of Renewable Energy Systems to the Low Voltage Network via Inverters (State latest revision) Electricity (Licensing) Regulations 1991 AS/NZS 3000 (State latest revision) Western Australian Electrical Requirements (State latest revision) Western Australian Distribution Connections Manual (State latest revision) AS 3100 (State latest revision) AS 4777 (State latest revision) AS 5033 (State latest revision) In addition, the following schedules have been submitted as part of the application: Schedule 1: Compliance Checklist Schedule 2: System Diagram Schedule 3: Circuit Diagrams Schedule 4: Cable Data Should you have any queries, please contact the undersigned. Yours Sincerely, Chartered Professional Engineer s Name and NPER Number Professional Title Company Name Company Address Contact Detail CS10# Page 56 of 58 Print Date 19/08/2014

57 *****SAMPLE ONLY: COVER LETTER FOR REUSED REFERENCE DESIGN**** Horizon Power 18 Brodie Hall Drive Technology Park Bentley, WA, 6102 Your Ref: XXXXXX Our Ref: YYYYYY (if applicable) DD/MM/YY Dear Sir/Madam Subject: Renewable Energy Connection - Project Name, Project Location Please find attached our submission for the abovementioned project. This letter is to declare that the abovementioned project makes use of the reference design for Project (State Project) dated (State Date). An NPER accredited chartered professional engineer has checked the reference design and it has been attached to our submission for your consideration. The abovementioned project does not differ with the NPER validated reference design in the key elements described in section of the Technical Requirements. In addition, the following schedules have been submitted as part of the application: Schedule 1: Compliance Checklist Schedule 2: System Diagram Schedule 3: Circuit Diagrams Schedule 4: Cable Data Should you have any queries, please contact the undersigned. Yours Sincerely, Name Professional Title Company Name Company Address Contact Detail CS10# Page 57 of 58 Print Date 19/08/2014

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