The Influences and Effects of Photovoltaic Array’s Bypass Diode and String Diode under Partially Shaded Conditions
Zhang Mingrui1, Jiang Liming1, Ouyang Li2
1. College of Electronic and Information Engineering, Tongji University, Shanghai 201804; 2. Central Academe, Shanghai Electric Group Co., Ltd, Shanghai 200070
Abstract：The different output characteristic influences of photovoltaic array’s bypass diode and string diode under partially shaded conditions are analyzed. The mismatch power loss's diminishment effect of bypass diode and string diode are distinguished. The Matlab’s solar cell which is applicable to establish photovoltaic array’s circuit model replaces complex math model. Because of photovoltaic cell’s short-circuit current changes linearly with irradiance, bypass diode’s set influences array’s output characteristic obviously. Because of photovoltaic cell’s open-circuit voltage changes nonlinearly with irradiance resulting in a small variation range, string diode's set influences array’s output characteristic less obviously.
2017, Vol. 18 
