PV reactive voltage regional autonomy control strategy for Q(U) improvement in distribution network

In order to solve the voltage over-limit problem of photovoltaic grid-connected, the inverter's reactive power output is adjusted to reduce the voltage limit. By analyzing the limitations of typical PV reactive voltage control methods, a modified Q(U)-based PV reactive voltage regional autonomous control strategy is proposed. This strategy sets the voltage threshold based on dynamic voltage and power information and divides the operating region. The Q (U) control strategy is used to calculate the PV reactive output target value, and the inverter is controlled to meet the reactive power output requirement. The simulation analysis results show that the method can solve the problem of voltage over-limit of photovoltaic access.