一种应用于电力系统的锁相环

摘要

Power system signal analysis becomes more and more important as the power system is rapidly developed.This paper gives an improved phase-locked loop（IPLL） structure for the application needs of power quality detection,power conversion systems,power systems protection,and so on.Mathematical model is analyzed with control theory.The functions of the IPLL are showed based on Matlab/simulink.The analysis mentioned above shows that IPLL can extract phase,frequency,amplitude and also fundamental wave.The applications of the IPLL don＇t need ？？ transform and dq transform compared with conventional phase locked-loop.This is a new choice for power system signal analysis application.%随着电力系统的快速发展,电力系统信号分析越来越重要。本文结合电能质量检测、电力变换以及电力系统保护等方面的实际需求,设计分析了一种改进型锁相环（IPLL）。文中利用控制理论详细分析了IPLL的数学模型,基于Matlab/Simulink对IPLL的功能进行了仿真。上述分析表明,该结构可以满足提取电网信号的相位、频率、幅值和基波等信息的需求。与电力系统中普遍应用的锁相环相比,减少了？？变换和dq变换等环节,增加了跟踪信号幅值的功能。为电力系统的信号分析提供了一种新思路。