Coslight Hybrid Power System with Solar

Transcription

1 Coslight Hybrid Power System with Solar (Technical Manual Draft V1.0) Harbin Coslight Power Co., Ltd.

2 Contents I. Overview... 2 Characteristics of System with Solar 2 II. Composition of System with Solar Basic Composition of System with Solar...5 Optional Component of System with Solar...5 III. The Logic of System with Solar.. 6 Active Mode of Solar... 6 Power Mode by Battery... 6 Active Mode of DG... 7 Optimization of Control Mode IV. Monitoring and Remote Control of System with Solar 8 Monitoring of System with Solar...8 Remote Control of System with Solar... 9 V. Composition of System with Solar...10 VI. Configuration of System with Solar...10 VII. Abbreviation in Document 11 1

3 I. Overview The typical utilization of traditional diesel generator unit is installed in outdoor telecom site without city power grid or with frequent power failures, which have many disadvantages, such as low service efficiency, high maintenance cost and short service life. The new generation of Coslight Hybrid Power System with Solar ( System with Solar ) is developed based on Coslight Hybrid Power System ( System ).The System can be combined with a 4.5kW solar whose cost is 95,000 and which will save more than 430,000 for 20 years. As the most excellent solution for BTS installed in the regions with plenty of sunshine and without mains supply or with frequent power failures, Coslight solution is economical, reliable, safe and environmental protection. Characteristics of System with Solar 1. In System with Solar, the rated power of solar system is 4.5kW. When the weather is sunny, the solar system can provide 36kWh per day accounting for 50% of full load 72kWh, that means 1.5kW power is supplied by solar power. 2. The average runtime for DG is about 2 hours per day, and the total operating process is high efficient and effective. It results in a 60% of fuel consumption reduction compared with direct power by standard genset. 3. When the average load is 2.4kW every day, the DG runs for approximate 2h per day.the service life of DG is prolonged, and the expected service life will be over 15 years. If DG runs 24 hours a day to supply a BTS located in an area without mains supply, the service life of DG is only about 2 years. 4. As a new type battery, Coslight LFP battery has advantages such as small volume, light weight, and long service life, safe and reliable. No. Ambient DOD Service Life Temperature % 8000 cycles minimum % 7000 cycles minimum % 4000 cycles minimum The battery charge-discharge times can be 1-2 cycles per day according to the real load power. The battery shall be charged and discharged 1 cycle a day corresponds to 1.1kw average load every day, thus the service life of the battery is estimated to be over 10 years if the actual operation temperature of the battery is less than 40. The battery shall be charged and discharged 2 cycles a day corresponds to 2.4kW average load every day and then the service life of the battery is estimated to be over 5 years if the 2

4 actual operation temperature of battery is less than 40. Normally, no air conditioner is required for the maximum ambient temperature is not more than +38, and the air conditioner is required for the maximum ambient temperature more than Estimated OPEX OPEX in 10 years (Based on information in China, excluding maintenance cost) If the everyday average load is 1.1kW, the daily cost is as follows No. Name Amount (Yuan/day) Condition 1 Battery 21.9 Service life of battery= 10 years 2 Solar Power 13 Service life = 20 years 3 Fuel 6.16 No sunshine for 3 days per month 4 Other Components 13.6 Service life = 20 years Total OPEX in 5 years (Based on information In China, excluding maintenance cost) If the everyday average load is 2.4kW, the daily cost is as follows No. Name Amount (Yuan/day) Condition 1 Battery 43.8 Service life of battery= 5 years 2 Solar Power 13 Service life = 20 years 3 Fuel 77 2 hours per day, 5 liters per hour 3 days with no sunshine in a month 4 Other Components 18.1 Service life = 15 years Total

5 6. Comparison of System with Solar. For System with Solar corresponds to the everyday average load 2.4kW, OPEX (Based on information in China, excluding maintenance cost) per day is estimated as follows No. OPEX / Day Amount (Yuan) Condition 1 Battery 43.8 Service life = 5years 2 Fuel hours per day, 5liters per hour, RMB 7 Yuan/liter 3 Other Components 27.3 Service life =10 years Total When the everyday average load is 2.4kW, the OPEX per day of the system is 211.1, and with the same load, that of using the System with Solar is Cost difference per day between the two solutions: = 59.2/day. The total cost difference for 20 years: = 432,000 on the assumption that the estimated service life of solar is 20 years. 4

6 II. Composition of System with Solar High strength I-steel beam is used as the internal structure of the braced steel frame. The DG, fuel tank, LFP batteries box, DC-DC converter and controller, etc. are firmly and stably mounted on the braced steel frame.the external structure is spliced by galvanized metal plates and spray coating steel plates. The solar panels are mounted on special steel frame. These parts are shown in figure below. PV Panel Solar Array Basic Composition of the System with Solar 1. Integrated outdoor steel structure 2. Weather and sound proof canopy 68dB (A) 1 mt 3. Solar ( Solar battery unit) 4. DG with engine at variable speed(if Optional) 5. Integrated fuel tank of 900 litres 6. LFP battery with long service life, deep and circular charge and discharge 7. High-efficiency DC-DC converter 8. Controller (automatic switchover between oil and electric power, alarm and protection) 9. Communication interface Display common faults/engine running/low fuel level/auto mode/low oil pressure/high engine temperature. Add or reduce displayed parameters as required by client. Optional Component of System with Solar 1. Matchable 48V DC air conditioner W DC/AC converter for small AC loads 3. External expansion tank of 2000 litres 5

7 III. The Logic of System with Solar The operation modes of System with Solar switches automatically through the system controller i.e. Active/Sleep Mode of solar, Active/Sleep Mode of DG, Charge/Discharge Mode of battery bank, details as follows. Active Mode of Solar When the DC output power of the 48V solar is more than the load power, the solar supplies power for load and charges the battery. When the DC output power of the 48V solar is equal to load power, the solar supplies power for load. When the DC output power of the 48Vsolar is less than load power, the solar and the battery supply power for load simultaneously. Power Mode by Battery When there is no sunshine or sunshine is seriously insufficient, the solar turns to sleep mode, and the battery supplies power for the load. When sunshine is insufficient, DC output power of the 48V solar is less than load power, both the battery and the solar supply power for load. 6

8 Active Mode of DG When the battery reaches the set DOD value, the output power of the solar is zero or less than the required load power, the DG turns to Active Mode to supply power for load and charges the battery till the battery is fully charged. Optimization of Control Mode Through optimization of the above-mentioned control modes, the solar power is used to the largest extent, the battery will get neither overcharged nor overdischarged because the DG turns to Sleep Mode when the batter reaches the set cutoff voltage and the DG turns to Active Mode when the battery reaches the set DOD. 7

9 IV. Monitoring and Remote Control of System with Solar Monitoring 8

10 Remote Control of System with Solar The remote control of System with Solar is based on internet remote monitoring, the network expansion telecommunication unit WEBTU1 integrating a SIM card communicates with the system controller via RS232 interface. All functions of the power system can be controlled through network, especially power system status/ battery status/ DC-DC converter status/fuel status, etc. All information collected by the system controller can be transmitted to Coslight management server through the IP/GPRS function of WEB TU1. Scheme of Data Collection Remote Control System 9

11 V. Composition of System with Solar VI. Configuration of System with Solar No. Configuration (System Parameters) Rated Value(3KW Power ) 1 Output power of DG 15KW 2 Output voltage of DG DC190V-260V 3 Solar 4.5KW 4 Power of DC-DC Inverter 21KW 5 Capacity of LFP battery 480AH 6 Volume of fuel tank 900L 7 Noise level at canopy 68/75DB(A)at 1mt 10

12 VII. Abbreviation in Document AC Alternating Current DC Direct Current DC DG Direct Current Diesel Genset (The DG can output DC directly) DG Diesel Genset DOD Depth of Discharge LAN Local Area Network LFP Lithium Iron Phosphate OPEX Operating Expense PMG Permanent Magnet Generator PV Panel Photovoltaic Panel SHPS Solar Hybrid Power System SMS Storage Management Services 11