In order to solve the problem of voltage limit violation and voltage fluctuation caused by the high-proportion residential photovoltaic(PV)power integrated into low-voltage distribution networks

and reduce the network operation risk

a residential PV reactive power control strategy based on Mamdani fuzzy inference is proposed. The strategy uses the voltage excursion and PV active power variation rate as two inputs to adapt to voltage limit violation and voltage fluctuation scenarios

respectively. Fuzzy rules are developed according to the logical relationship between the input and the output of inverter reactive power. Then the reactive power output of the PV inverter is obtained via the defuzzification process. The parameters of the fuzzy triangular membership functions of different buses are coordinated and designed based on the voltage sensitivity theory. Therefore

an effective utilization of reactive power capacity of residential PV inverters can be achieved. Finally

the simulation results show that the proposed strategy can effectively mitigate the voltage limit violation and voltage fluctuation. In contrast with the conventional reactive power droop control of inverters

the voltage limit violation and voltage fluctuation are effectively suppressed.