中文摘要：

针对电网电压畸变条件下电力电子变流器的同步锁相问题，提出一种基于频率自适应滑动平均滤波原理的同步锁相（MA-PLL）方法．该方法在传统的同步锁相环基础上，利用滑动平均滤波器在零点频率处的高衰减性能，消除畸变电网条件下电压谐波及不平衡分量对同步锁相的精度影响；采用频率自适应和幅值归一化方法，提高锁相环在电网电压频率变化与幅值波动时的跟踪性能；采用小信号分析法，对锁相环系数进行设计和选取，提高锁相环的动态响应．实验结果表明：在电网电压畸变、不平衡以及频率变化情况下，提出的方法均能准确快速地获得电网的相位和频率信息．

英文摘要：

In order to deal with the grid synchronization problem of power electronic converter under dis- torted grid voltage conditions,a synchronization method based on frequency adaptive moving average filter phase locked loop （MA-PLL） was proposed. A moving average filter is inserted in the conventional syn- chronous rotating frame PLL in order to eliminate the influence of unbalance and harmonic distortion volt- age components in adverse grid conditions. In addition, frequency-adaptive algorithm and magnitude nor- malized method are used to improve the performance of MA-PLL under the frequency variation and magni- tude voltage fluctuation. The PLL coefficients are optimized by the small-signal model analysis method, which improveds the dynamic performance of MA-PLL. The experimental results show that the proposed MA-PLL can accurately and rapidly obtain grid phase and frequency information under adverse grid condi- tions （e. g. , grid voltage distortion, voltage imbalance and frequency variation）.