DC offset component is usually added into the input signal via the measurement path of grid voltage,which has a great influence on the performance of synchronous reference frame phase locked loop(SRF-PLL). To eliminate this influence,adaptive least mean square(LMS)algorithm is adopted to filter the DC offset component in the grid volt?age input signal. Moreover,a structure that has a simple discrete implementation is added to generate orthogonal sig?nals. The experimental results indicate that the proposed method can eliminate the influence of DC offset component ef?fectively,and it has good steady-state and dynamical performances.%电网电压采样环节会将直流偏置分量引入到电网电压输入信号中,影响同步参考坐标系锁相环SRF-PLL(synchronous reference frame-PLL)的性能.为消除直流偏置分量对锁相环性能的影响,采用自适应最小均方(least mean square,LMS)算法滤除电网电压输入信号中的直流偏置分量,并添加一种便于离散化的结构产生正交信号.实验结果表明所提锁相环方法能够有效消除直流偏置分量对锁相环性能的影响,具有良好的稳态和动态性能.
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