一种频率自适应滑动平均滤波器的电网同步方法  

A grid synchronization method using frequency adaptive moving average filter

作　　者：曾争[1] 杨家强[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2014年第9期1696-1703,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51177150)

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.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）.

关 键 词：锁相环 滑动平均滤波器 谐波畸变 频率自适应 电网同步 

分 类 号：TM46[电气工程—电器] TM71