一种软件锁相环和电压跌落检测新算法  

A New Algorithm for Software Phase Locked-loop and Voltage Sag Detection

作　　者：陈国栋[1] 朱淼[1] 蔡旭[1] 李睿[1] 宋晋峰 周悦 

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]上海电气输配电集团技术中心,上海市长宁区200042

出　　处：《中国电机工程学报》2014年第25期4385-4394,共10页Proceedings of the CSEE

基　　金：国家高技术研究发展计划项目(863计划)(2011AA05A111);上海市科技创新行动计划项目(13DZ1200200)~~

摘　　要：动态电压恢复器(dynamic voltage restorer,DVR)的响应速度是衡量DVR特性的重要指标,锁相环和电压跌落检测算法则是决定其响应速度的2个关键因素,而电网电压畸变、跌落过程中发生的相位跳变和电压不平衡制约着锁相环和检测算法的快速性。该文结合最小方差(least error squares,LES)滤波器和改进对称分量法设计了新的软件锁相环和电压跌落检测算法,对这2种方法进行详细的理论推导,阐明各频次的正负序分量解耦的机理。在Matlab/Simulink中搭建仿真模型,与传统锁相环方法和电压跌落检测算法进行对比分析。最后,在电压跌落平台进行工业样机验证,结果表明所提方法可行有效,且具有较高的响应速度。On the engineering application of a dynamic voltage restorer （DVR）, the response time is a key factor to judge the performance of the DVR, which is depended on the software phase locked-loop （SPLL） and the voltage sag detection algorithm. Phase jump, unbalance and harmonic accompanied with the voltage sag usually impact the dynamic response of the SPLL and the voltage sag detection. The paper proposed a new algorithm based on the combination of the least error squares （LES） filter and improved symmetrical components method, then the detailed procedure was presented, and the crossing-decoupling frequency-domain of positive and negative components was analyzed. To verify the effectiveness, a DVR simulation model had been built in Matlab/Simulink and a series of comparison and analysis had been carried out. Finally, a 10 kV/2 MVA prototype was tested on a voltage drop generator platform. The improved response time and validity are demonstrated by experimental results with the comparison of traditional methods.

关 键 词：动态电压恢复器 最小方差滤波器 对称分量 软件锁相环 检测算法 

分 类 号：TM761[电气工程—电力系统及自动化]