Roy Allen, Technical Training, 17FEB2015 ABB Solar Days Residential Products, Design & Application Rapid Shutdown. ABB Feb 27, 2014 Slide 1

Transcription

1 Roy Allen, Technical Training, 17FEB2015 ABB Solar Days Residential Products, Design & Application Rapid Shutdown Feb 27, 2014 Slide 1

2 ABB Single-Phase Products MICRO Inverter Single MPPT Dual MPPT MICRO-0.25-I UNO-2.0-I PVI-3.0-TL PVI-5000-TL UNO-7.6-TL MICRO-0.3-I UNO-2.5-I PVI-3.6-TL PVI-6000-TL UNO-8.6-TL MICRO-0.3HV-I PVI-3.8-TL PVI-4.2-TL Month DD, YYYY Slide 2

3 ABB Three-Phase Products Isolated PVI-10.0-I-208 PVI-10.0-I-480 PVI-10.0-I-600 PVI-12.0-I-208 PVI-12.0-I-480 PVI-12.0-I VDC -TL TRIO-20.0-TL-US TRIO-27.6-TL-US 1000VDC, Multiple MPPT ULTRA-750-TL ULTRA-1100-TL ULTRA-1500-TL Slide 3 Month DD, YYYY

4 ABB Single-Phase String Inverters Training Objectives Rapid Shutdown Month DD, YYYY Slide 4

5 2014 NEC article Rapid Shutdown ABB Solution architecture Key Product Features Utilizes contactors on rooftop device controlled by 24V voltage source from inverter 24V conductors to be run in same conduit as PV strings Ways to initiate disconnect Open AC Disconnect Press Remote E-Stop If combining on roof, additional local disconnecting switch required (more cost) Slide 5

6 Packaging The solution will be sold as a Rapid shutdown kit for ABB inverters Kit will be field installable wherever NEC requirement is enforced Complete system (ABB inverter + rapid shutdown kit) certified to UL1741 Installation instructions will be provided in the kit Benefits of Kit approach Eliminates the need to stock multiple inverter SKUs Only requires forecasting of different SKUs of rapid shutdown kit; inverter forecast can remain unchanged Slide 6

7 System Contents 24V power supply Rapid shutdown box Terminal blocks Instructions Slide 7

8 Available options Enclosure Dimensions 10 x8 x4 Type 4X rating Four strings in, two out Useful for dual MPPT operation Two bleeder resistors provided Local disconnecting switch Two strings in, one out Useful for parallel or single MPPT operation No fuses, one bleeder resistor in rooftop box Local disconnecting switch Two strings in, two out pass through Useful for dual MPPT operation (one string per MPPT) No fuses, two bleeder resistors No local disconnecting switch Slide 8

9 SKU # 1 Four strings in, two out, combined SKU # 2 Four strings in, two out String 1 20A rating CH1 String 2 To inverter String 3 20A rating CH2 String 4 24V Slide 9

10 SKU #1 use cases Four strings Dual MPPT SW SW ~20A ~20A M1 M2 = ~ Three strings Dual MPPT SW SW ~20A ~10A M1 M2 = ~ Slide 10

11 SKU # 2 Two strings in, one out combined SKU # 2 Two strings in, one out String 1 20A rating CH1 String 2 To inverter Local disconnect 24V Slide 11

12 SKU #2 use cases Two strings Single MPPT SW ~20A M1 = ~ One string Single MPPT SW ~10A M1 = ~ Slide 12

13 SKU # 3 SKU # 3 Two strings in, two out pass-through String 1 10A rating CH1 String 2 10A rating CH2 To inverter 24V Slide 13

14 SKU #3 use cases Two independent strings Dual MPPT SW SW ~10A ~10A M1 M2 = ~ Slide 14

15 Components Bleeder resistor Contactors Bleeder resistor Local disconnect switch Input and output terminals 24V connection from inverter Slide 15

16 solutions Inverter Switchbox Modifications Replace with 3- position terminals DIN rail mounted 24Vdc power supply Remove one of two GND terminals on DC side Slide 16

17 Competitive benchmarks ABB SMA Fronius SolarEdge Disconnection method Contactor Contactor Solid state (using Tigo optimizers) Solid state (optimizer) E-stop button Optional Required* Optional Optional Method of initiation of rapid shutdown Meter pull or flip AC breaker Signal from E- stop (additional wiring) Through inverter Inverter DC disconnect switch Extra conduit required No Yes, for E-stop button Yes, for Tigo gateway* No Combining on roof Yes Yes N/A N/A How many strings supported Estimated system cost (equipment + labor) * N/A N/A $ $$ $$$ $$$ * To be confirmed Slide 17

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19 Transformer-less vs. Isolated: Part 4: Installation Methodology/Requirements Transformer-less Inverter DC + DC - AC Grid EGC SE Array/strings are floating with respect to ground (Array is NOT intentionally bonded GND) RISO measurements and RCD used to determine GF condition All DC wiring must have two levels of insulation When combiner fuses are required both POS and NEG conductors must be fused If DC switch is required both POS and NEG conductors must be switched Slide 19

20 Transformer-less vs. Isolated: Part 4: Installation Methodology/Requirements Transformer-Isolated Inverter DC + DC - EGC AC SE Grid Intentional bond between array and the grounding conductor. Either POS or NEG conductor must be bonded to ground Ground bonding jumper is the GF Detector fuse Example shows a NEG ground systemhow do we know? If combiner fuses are required, only needed in hot conductor If DC switch is required only switch hot Slide 20