Optimal scheme of PV array in partial shading: A reconfiguration algorithm

Abstract

The local shadow can easily make the photovoltaic (PV)array appear hot spot phenomenon, reduce the output power and affects the security and the reliability of the PV power generation system; At the same time, the P-V characteristic of PV array is changed from single peak curve to multi peak curve, which makes the MTTP controller unable to achieve maximum power tracking. In order to solve the problem that the output power is affected by the partial shading, in this paper, a global optimization method for PV array reconfiguration is adopted. By changing the connection mode of the PV array, shadow localized PV array by optimization algorithm can achieve optimal distribution of shadows, maximally achieve the output power of PV array smoothly under the condition of shadow, improve the output power of the whole PV array to some extent. It also eliminate the local peak value, improve the multi peak phenomenon and verify the effectiveness of the optimization strategy by PSCAD/EMTDC simulation.