Abstract
Photovoltaic (PV) elements have inherent variation between cells and panels due to manufacturing tolerance, degradation, and situational differences. This variation increases over system lifetime and creates maximum power point current mismatch that reduces output power when PV elements are strung in series. Traditionally, mismatch loss is addressed using cascaded converters. However, this research examines a differential converter architecture that achieves higher efficiency by processing a fraction of the total power. The effect of PV maximum power point (MPP) current variance on output power is modeled and examined using Monte Carlo simulation for the series string architecture with and without bypass diodes, and the PV-to-Bus and PV-to-PV differential power processing (DPP) architectures at various power ratings. Hot spotting can be a problem that significantly reduces output power. PV elements at fault can be bypassed, passively or actively, to reduce power loss. Simulation results show that both DPP architectures employing active bypass are able to compensate mismatch over the 25-year lifetime of a PV system with converters sized at approximately 10-20% of the panel ratings.
Original language | English (US) |
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Title of host publication | 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012 |
DOIs | |
State | Published - 2012 |
Event | 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012 - Kyoto, Japan Duration: Jul 10 2012 → Jul 13 2012 |
Other
Other | 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics, COMPEL 2012 |
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Country/Territory | Japan |
City | Kyoto |
Period | 7/10/12 → 7/13/12 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Modeling and Simulation