基于谐振控制器的变流器负序电流控制方法

Negative Sequence Current Control Method of Converter Based on Resonant Controller

考虑电网电压三相不平衡、宽频谐波等异常情况,采用最小二乘法计算电压、电流基波正序和负序值,通过软件锁相环控制技术自动跟踪电压基波正序旋转矢量,精确得到电网电压相位值。在对谐振控制器特性分析基础上,提出基于谐振控制器的变流器负序电流控制方法,实现风电机组电网电流不平衡控制。MATLAB仿真结果验证了所述谐振控制器的变流器负序电流控制方法的有效性。

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 fundamental 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 characteristics of resonant controllers,a negative sequence current control method for inverters based on resonant controllers is proposed to achieve current imbalance control in the wind turbine power grid.MATLAB simulation results validate the effectiveness of the negative sequence current control method for the inverter with the resonant controller described in this article.