Coordinated control method of active and reactive power for voltage regulation in distribution systems with high-penetration PV

Abstract

Owing to the intermittent and randomness of solar radiation, high-penetration photovoltaic (PV) energy injected into power distribution systems will inevitably change the magnitude and direction of the power flow, thus causing problems such as voltage violation of the point of common coupling (PCC) and further having a hazardous influence on consumers’ electricity quality. And the communication construction of China’s distribution systems is now relatively weak, difficultly integrating multiple voltage regulation equipment. To improve consumers’ voltage quality at the PCC, a coordinated control method based on active and reactive power of local inverter is proposed. This method can realize the economic regulation of the voltage at the PCC through reactive compensation and active reduction, which can maximumly assure the voltage magnitude at the PCC within limits (including upper and lower limits) and maximize the utilization capacity of PV inverter. Based on Matlab/Simulink, simulation results in different scenarios show the effectiveness of the proposed method.