Fuzzy logic‐based multi‐mode voltage control strategy for high ratio photovoltaic in a distribution network

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Abstract
To solve the problems of voltage crossing, offset and fluctuation caused by the high proportion of distributed photovoltaic (PV) access to the distribution network and reduce the risk of grid operation, proposing a Mamdani fuzzy logic based multi‐mode voltage control strategy for high ratio PV distribution network. Based on the voltage scale value of the grid connection, the control strategy combines multi‐mode operation with fuzzy logic and divides the PV inverter operation into three modes: Overvoltage suppression, undervoltage suppression, and network loss/power factor optimization. The control strategy is designed with different fuzzy controllers for each mode of operation to suit different operating conditions. The fuzzy rules are formulated based on the logical relationship between the inputs and the reactive power output of the inverter, and the reactive power output standardized value of the PV inverter is obtained by the defuzzification process. The simulation results show that the proposed method can alleviate the voltage crossing, voltage drift, and voltage fluctuation problems. Moreover, the voltage crossing and voltage drift are effectively suppressed, and the power factor is improved compared with the reactive power sag control, multi‐mode control, and traditional fuzzy control.

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