Output Characteristics and MPPT Research for PV Array dunder Partially Shaded Conditions

MPPT(maximum power point tracking) has been one of the hot issues in PV power system all the time. At present, most of MPPT methods are very efficient only under uniform irradiance. However, the output power-voltage curve presents multi-peak characteristics under PSCs (partially shaded conditions), which is one challenge of the MPPT technology. In this paper, the segment characteristics of PV array, which is made by PV modules in series-parallel (SP) connection, was analyzed in details under PSCs. And then a GMPPT (global maximum power point tracking) algorithm was proposed based on the segment model. The MPPT controller using this algorithm can rapidly locate the segment where the GMPP(Global Maximum Power Point) is in and then converges the working point to GMPP using an improved InC (Incremental Conductance) method. A Matlab/SIMULINK model verifies that the proposed algorithm is efficient under both uniform irradiance and PSCs.

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System śledzenia warunków maksymalnej mocy MPPT jest powszechnie stosowany w systemach fotowoltaicznych. Systemy te w większości działają w warunkach jednorodnego nasłonecznienia. W artykule zaproponowano system śledzenia mocy w warunkach częściowego nasłonecznienia.