电压暂降检测算法及仿真分析  

Voltage Sag Detection Algorithm and Simulation Analysis

作　　者：高熊 陈星[1] 赵天义 白旭 Gao Xiong;Chen Xing;Zhao Tianyi;Bai Xu(School of Mechanical Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《机电工程技术》2022年第10期165-168,191,共5页Mechanical & Electrical Engineering Technology

摘　　要：介绍了电力系统中的电压暂降基本概念及危害,对均方根值检测法、dq变换法、单项瞬时dq变换法、αβ变换法、基于TEO能量算子检测法等进行了原理阐述及分析。针对αβ变换法检测实时性较差的问题,提出一种综合αβ变换法和ICA检测法的电压暂降检测方法。将独立分量(ICA)引入电压暂降检测中,根据电压暂降产生的原理来检测、分离电压信号。此种检测方法以αβ变换法为基础检测电压暂降幅值及相位变化,ICA检测法检测电压暂降起止时间,ICA解算值反映了电压信号波形畸变的起止时刻,不仅摆脱了传统dq变换法对同步采样的依赖,弥补了αβ变换法无法准确检测起止时间的缺点,同时对于谐波、噪声有一定的抗干扰性。在Matlab中对ICA检测法进行仿真分析,结果表明了其能够较好地完成电压暂降的检测。The basic concepts and hazards of voltage sags in power systems were introduced,and the principles of the RMS detection method,dq transform method,single-term instantaneous dq transform method,αβtransform method,and TEO-based energy operator detection method were expounded and analyzed.Aiming at the problem of poor real-time detection byαβtransform method,a voltage sag detection method combiningαβtransform method and ICA detection method were proposed.The independent component(ICA)was introduced into the voltage sag detection,and the voltage signal was detected and separated according to the principle of the voltage sag.The detection method was based on theαβtransformation method to detect the voltage sag amplitude and phase changes.The ICA detection method detected the start and end time of the voltage sag.The ICA solution value reflects the start and end times of the voltage signal waveform distortion,which not only gets rid of the traditional dq transformation method.The dependence on synchronous sampling makes up for the shortcomings of theαβtransform method that can not accurately detect the start and end times,and at the same time has a certain anti-interference for harmonics and noise.The ICA detection method is simulated and analyzed in Matlab,and the results show that it can complete the detection of voltage sags well.

关 键 词：电压暂降 dq变换法 αβ变换法 ICA检测法 

分 类 号：TM71.4[电气工程—电力系统及自动化]