摘要
本文提出了一种新颖的适用于三相电力系统在频率波动条件下的锁相环系统。介绍了锁相环的三个环节鉴相器、环路滤波器和压控振荡器的基本构成以及系统的工作原理,并在离散时域内分析了锁相环系统的动态特性,通过闭环系统的根轨迹给出了系统的稳定条件,仿真实验结果表明该锁相环可以很好地跟踪系统频率的变化从而实现相位的锁定。
A novel phase locked loop system used to realize real time phase synchronization under the condition of frequency variations of three-phase power system is presented.The paper introduced the system configuration and operation theory,at the same time analyzed dynamic characteristics in discrete time domains and gave the stability condition of system through closed-loop system root locus.Simulation experiment verified that phase lock loop system put forward in this paper can measure the instantaneous frequency and phase of power system.
出处
《电气技术》
2008年第1期64-66,共3页
Electrical Engineering
关键词
锁相环
离散时域
动态特性
根轨迹
phase locked loop
discrete time domain
dynamic characteristics
root loci
