A Voltage Regulation Method Based on the Coordinated Power Control of Distributed Photovoltaic Inverter

The increasing integration of distributed photovoltaic results in the overvoltage problem at the point of interconnection, which can be regulated by controlling the active and reactive power of inverters, so a voltage regulation method is presented based on the coordinated power control of inverters in control area by studying such typical voltage regulation methods as Active Power Curtailment (APC) method and reactive power controlling methods including Q(U) and Q(P). By combing the APC and Q(U) method and considering the coordination between each distributed inverters, the constrained optimization mathematical model is built, which can solve active and reactive power reference value using complex method and guaranteeing the voltage level on buses within the limits. At last, a typical low voltage distributed network is used to verify the superiority of proposed method by comparing with the existing methods.