Study of bypass diodes configuration on PV modules with partial shaded

Light intensity is a very important factor in photovoltaic (PV) power generation, its efficiency will be greatly reduced in generating electricity when they are in partial shading and shadow effecting. In order to solve the maximum power point tracking (MPPT) problem of centralized PV arrays under complicated illumination environment, this study proposes reconstructing the by-pass diode, it can be effectively solved to keep the unobstructed power units working through this method, the power units of PV are judged by measuring the voltage of PV and they are connected the by-pass diode switches and parallel diode switches, so that the rest unshielded cells can continue to work, the whole PV will output electric power under the partially blocked condition. The test results show that the part of the shadow of the effective control of the output power with refactoring bypass diode of solar battery power, the output power has obvious improvement, the output can reach 126.9% by using refactoring's diode layout of PV by compared with ordinary diode layout.