Abstract

At present, the asymmetric faults that take place in a power grid result in the grid current imbalance, and feed into the grid power inducing oscillation, which seriously affects the stability of power grid. For the asymmetric fault, the second-order generalized integrator(SOGI) is used to separate the positive and negative sequence components. The negative sequence voltage feedforward control method with notch filter is proposed. It can suppress the influence of the double frequency alternating components generated by the line side negative sequence components, and improve the low voltage ride through performance of the photovoltaic power generation system. Then, the key parameters of the inverter are identified by chaotic particle swarm optimization(CPSO) algorithm. The simulation model in Matlab/Simulink verifies the feasibility and effectiveness of the proposed method.

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