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浙江大学学报(工学版)
浙江大学学报(工学版)
电气工程     
一种频率自适应滑动平均滤波器的电网同步方法
曾争,杨家强
浙江大学 电气工程学院,浙江 杭州 310027
A grid synchronization method using frequency adaptive moving average filter
ZENG Zheng ,YANG Jia-qiang
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
 全文: PDF(2380 KB)  
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.
关键词： 谐波畸变;  频率自适应;  锁相环;  滑动平均滤波器;  电网同步    
Abstract:

In order to deal with the grid synchronization problem of power electronic converter under distorted 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 synchronous rotating frame PLL in order to eliminate the influence of unbalance and harmonic distortion voltage components in adverse grid conditions. In addition, frequency-adaptive algorithm and magnitude normalized method are used to improve the performance of MA-PLL under the frequency variation and magnitude 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 conditions (e.g., grid voltage distortion, voltage imbalance and frequency variation)．
Key words: frequency adaptive filter    moving average filter    phase locked loop (PLL)    grid synchronization    harmonic distortion
出版日期: 2014-09-30
:  TM 46  
基金资助:

国家自然科学基金资助项目(51177150)
通讯作者: 杨家强，男，副教授     E-mail: yjq1998@163.com
作者简介: 曾争（1987－），男，博士生，从事电能质量及其控制技术研究. E-mail: zengzheng0701@zju.edu.cn
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曾争,杨家强. 一种频率自适应滑动平均滤波器的电网同步方法[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2014.09.022.

ZENG Zheng,YANG Jia-qiang. A grid synchronization method using frequency adaptive moving average filter. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2014.09.022.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2014.09.022    或    http://www.zjujournals.com/xueshu/eng/CN/Y2014/V48/I9/1696

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