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2014 PV Performance Modeling Workshop: Inverter performance models Opportunities and requirements for the future: Jaspreet Singh, PG Solar

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2014 PV Performance Modeling Workshop: Inverter performance models Opportunities and requirements for the future: Jaspreet Singh, PG Solar

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2014 PV Performance Modeling Workshop: Inverter performance models Opportunities and requirements for the future: Jaspreet Singh, PG Solar

  1. 1. Inverter performance models Opportunities and requirements for the future Jaspreet Singh, PG Solar, May 5th 2014 © ABB May 05, 2014 | Slide 1
  2. 2. 2 Confidential© ABB May 05, 2014 | Slide 2 A global leader in power and automation technologies Leading market positions in main businesses  145,000 employees in about 100 countries  $39 billion in revenue (2012)  Formed in 1988 merger of Swiss and Swedish engineering companies  Predecessors founded in 1883 and 1891  Publicly owned company with head office in Switzerland
  3. 3. Solar PV applications Product, system and solutions offering Solar inverters Low voltage products PV power plants Products and solutions for trackers Grid integration • Micro inverters • String inverters – single phase • String inverters – three phase • Central inverters • Turnkey inverter solutions • Switching (switch- disconnectors, circuit breakers, contactors) • Protection (miniature- circuit breakers, residual current devices, fuses, surge protective devices • Metering and monitoring • Combiner boxes • Other (terminal blocks, pilot devices, etc). • Turnkey, balance of system (BoS) and eBOP (electrical balance of plant) offering • Remote operations and maintenance, SCADA • Plant automation and optimization • Brake motors • DC motors • Drives • PLCs • Manual motor starters • LV breakers and switches • PLC peripheral products (monitoring relays, timers, power supplies, serial data converters, interface relays, opto couplers…) • Turnkey substations • Compact secondary substations (CSS) • Transformers • Medium voltage switchgear • FACTS • HVDC power transmission Related offerings ABB in solar: Most comprehensive value proposition Full range of products and solutions for key applications Microgrids Residential Commercial Utility Smart grids Electric vehicle charging Battery energy storage
  4. 4. 4 Confidential  External tools  CEC efficiency - Sandia guidelines, factory witnessed  CEC efficiency - includes auxiliary power  OND files - certified by 3rd party IE partner  Post processing tools - simplified Excel files with derating factored  Derating plots - temperature, voltage, altitude  Internal tools  Inverter models - coefficients for temp/voltage derating  Array model - single diode equation models from public data  Combined model to spot check and approve applications Inverter performance models What we share © ABB May 05, 2014 | Slide 4
  5. 5. 5 Confidential  CEC efficiency  Revised Sandia guidelines  Auxiliary load Inclusion  Thermal derating  Ambient temperature  Solar gain  Voltage derating  DC input voltage  Power factor operation  Voltage dependence  Temperature dependence Inverter performance models Opportunities © ABB May 05, 2014 | Slide 5
  6. 6. 6 Confidential  DC/ AC ratios  Derating  Efficiency  Multi MPPT configurations  Different orientation  Variable conditions  MPPT Efficiency  Static  Dynamic Inverter performance models Opportunities © ABB May 05, 2014 | Slide 6
  7. 7. 7 Confidential  Multiple manufacturers  Large product portfolios  Multiple topologies  Different thermal designs  Different coefficients  Extensive testing  Data validation Inverter performance models Complexities © ABB May 05, 2014 | Slide 7
  8. 8. 8 Confidential  Initial models can be created based on design parameters  Final modified models can be based on measured data  Irradiance and other application effects need to be discussed Inverter performance models Thermal derating © ABB May 05, 2014 | Slide 8
  9. 9. 9 Confidential  Nominal power window and operating windows may be different  Temperature dependence on operating voltage need to be discussed Inverter performance models Voltage derating © ABB May 05, 2014 | Slide 9
  10. 10. 10 Confidential  Inverter output power ∝ inverter internal temperature  Inverter temperature = α1 x ambient temperature + solar gain  Solar gain = irradiance (W/m2) x solar absorption (%) + surface area (m2)  Inverter output power ∝ DC input voltage  DC input voltage = f (array voltage, MPPT operating point)  Array voltage = f (temperature, irradiance, Rsh) Inverter performance models Developing a model © ABB May 05, 2014 | Slide 10
  11. 11. 11 Confidential  Modeled PV array using single diode model and inverter derating model  Focus is on approving applications rather than energy harvest Inverter performance models Developing a model © ABB May 05, 2014 | Slide 11
  12. 12. 12 Confidential  A common industry benchmark is recommended  Phase approach can be used  Scientific community needs to support Inverter performance models Phase approach Derating models • Existing data Efficiency • New standards • New testing Applications • Power factor • Grid support • CPUC Rule 21 © ABB May 05, 2014 | Slide 12

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