研究目的
To study the number of maximum power points (MPPs) in photovoltaic (PV) module arrays during partial shading events by clouds and to understand the effects of PV array configurations and shadow edge characteristics on the occurrence of multiple MPPs.
研究成果
The study concludes that most partial shading events caused by clouds do not cause multiple MPPs in PV arrays. The number of MPPs decreases with more parallel-connected PV strings but increases with longer strings. The total-cross-tied electrical PV array configuration performs worse than the series-parallel configuration during partial shading. Energy losses from operating at a local MPP instead of the global one are minimal.
研究不足
The study assumes that cloud shadows are wide enough to cover the whole PV array, shadow edges are linear across a PV array area, and the apparent velocity of the shadow edge is constant during each simulation period. These assumptions may not hold in all real-world scenarios.
1：Experimental Design and Method Selection:
The study utilized measured irradiance data to identify shadow edges and simulate the electrical characteristics of PV arrays during these events. A validated mathematical model of irradiance transitions and a simulation model of a PV module were used.
2：Sample Selection and Data Sources:
Irradiance data from five months (May–September 2013) was used, with around 9000 shadow edges identified.
3：List of Experimental Equipment and Materials:
Silicon photodiode-based Kipp&Zonen SP Lite2 pyranometers were used for irradiance measurements.
4：Experimental Procedures and Operational Workflow:
The movement of shadow edges over PV arrays was simulated, considering the irradiance at the center of each submodule for each time step.
5：Data Analysis Methods:
The characteristics of MPPs were determined by finding the maxima of the simulated P–U curve of the array, with peaks very close to each other ignored.
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