Considering abnormal situations such as three-phase voltage imbalance and broadband harmonics in the power grid,this paper utilizes the least squares method to obtain the positive and negative sequence values of voltage and current fundamen-tal waves.Through software phase-locked loop control technology,the rotation vector of the positive sequence of the voltage fundamental wave is automatically tracked to accurately obtain the power grid voltage phase value.By investigating the charac-teristics of resonant controllers,a negative sequence current control method for inverters based on resonant controllers is pro-posed to achieve current imbalance control in the wind turbine power grid.MATLAB simulation results validate the effective-ness of the negative sequence current control method for the inverter with the resonant controller described in this article.
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