改善动态相位跟踪和不平衡电压检测性能的改进软锁相环算法  

A Modified Soft Phase Lock Loop Algorithm Improving the Performance in Dynamic Phase Tracking and Detection of Unbalanced Voltage

作　　者：袁志昌[1] 宋强[1] 刘文华[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《电网技术》2010年第1期31-35,共5页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB217907)~~

摘　　要：相位检测是控制系统的基础,软锁相环检测适用于电压畸变场合,便于数字化实现。分析了软锁相环应用于静止同步补偿器时面临的若干问题,并提出了2方面的改进方案:一是针对超前/滞后环节参数选取困难的问题,将其滤波功能转移到前置延时信号消除环节中;二是q轴电压经PI调节的输出直接作为相位的误差信号,减少了前向积分环节。通过仿真实验证明改进后的软锁相环在动态相位跟踪及不平衡电压检测等方面的性能有显著改善。Phase detection of power grid voltage is the base of control, soft phase lock loop （SPLL） detection is convenient for digital realization and suitable to the occasions where voltage distortion exists. In this paper, some problems that have to be faced with in the application of SPLL to static synchronous compensator （STATCOM） are analyzed, and two improvements of SPLL are proposed. The first one is removing the filtering function of lead-leg element into the prepositive delayed signal cancellation （DSC） element to remedy the difficulty in deciding its parameters; the second one is directly taking the post-PI regulation output of q-axis voltage as error signal of phase to call off the forward integrating element. The modified SPLL possesses better performance in dynamic phase tracking and detection of unbalanced voltage. Such a conclusion is verified by digital simulation.

关 键 词：相位检测 软锁相环 静止同步补偿器 延时信号消除 前向积分 动态相位跟踪 不平衡电压检测 

分 类 号：TM744[电气工程—电力系统及自动化]