基于改进锁相环的含谐波电压暂降检测方法  

Method for Detecting Voltage Sag Containing Harmonics Based on Improved Phase-locked Loop

作　　者：叶萌 李思萱 陈兴 吕干云[1] 章心因[1] Ye Meng;Li Sixuan;Chen Xing;Lyu Ganyu;Zhang Xinyin(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing Jiangsu 211167,China;Jiangning District Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing Jiangsu 211103,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]国网江苏电力有限公司江宁区供电分公司,江苏南京211103

出　　处：《电气自动化》2025年第1期26-29,共4页Electrical Automation

基　　金：国家自然科学基金项目(51577086);江苏“六大人才高峰”创新团队(TD-XNY004)。

摘　　要：电压暂降是电力系统中最重要的电能质量问题,不仅对系统安全稳定运行产生严重影响,还导致巨大的经济损失。为了实时监测电压暂降并降低谐波对电压监测的影响,提出了一种基于改进锁相环的含谐波电压暂降检测方法。通过分析改进锁相环的基本原理与稳定性,验证了改进后的锁相环结构不仅能够实现对输入信号基波的实时跟踪,还能够准确获取基波的频率和相位信息,并检测提取出谐波信号。仿真结果表明,在谐波环境下,改进后的锁相环结构对电压暂降的监测效果显著,为实时监测电压暂降提供了一种可行且有效的解决途径。简单的结构和优越的性能使其在电力系统中具有广泛的应用前景。Voltage sag is the most important power quality issue in the power system,which not only seriously affects the safe and stable operation of the system,but also leads to huge economic losses.In order to monitor voltage sag in real time and reduce the impact of harmonics on voltage monitoring,a harmonic voltage sag detection method based on an improved phase-locked loop(PLL)was proposed.By analyzing the basic principle and stability of the improved phase-locked loop,it was verified that the improved phase-locked loop structure can not only achieve real-time tracking of the input signal fundamental wave,but also accurately obtain the frequency and phase information of the fundamental wave,and detect and extract harmonic signals.The simulation results show that the improved phase-locked loop structure has a significant monitoring effect on voltage sag in harmonic environments,providing a feasible and effective solution for real-time monitoring of voltage sag.Its simple structure and superior performance make it widely applicable in power systems.

关 键 词：配电网 电能质量 改进锁相环 电压暂降 

分 类 号：TM711[电气工程—电力系统及自动化]