一种改进的三相不平衡电压暂降检测算法  

An improved three-phase unbalanced voltage sag detection algorithm

作　　者：彭诚 胡水林 曹宇 郝晓红 Peng Cheng;Hu Shuilin;Cao Yu;Hao Xiaohong(School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学机械与电气工程学院,成都611731

出　　处：《电测与仪表》2023年第8期62-65,91,共5页Electrical Measurement & Instrumentation

基　　金：中央高校基本业务费项目(2019J039)。

摘　　要：目前电压暂降成为了影响电能质量的主要因素,对电网电压进行快速且准确地检测是进行电压暂降治理的前提。文中针对三相不平衡电压暂降,依据对称分量原理提出了一种改进的三相不平衡电压暂降的检测算法。该算法在双dq变换的基础上,首先将所检测的电压信号进行正序负序坐标变换,而后通过三个连续的采样点对坐标变换后dq坐标系下的正序、负序分量中的直流成分进行快速提取,通过幅值与相位的计算可分别求得发生三相不平衡电压暂降后的正序、负序电压分量的幅值与相位。MATLAB/Simulink仿真结果验证了该方法的先进性与有效性。At present,voltage sag has become the main factor affecting power quality,so the quick and accurate detection of grid voltage is the prerequisite for voltage sag management.Aiming at the three-phase unbalanced voltage sag,an improved detection algorithm for three-phase unbalanced voltage sag is proposed based on the principle of symmetrical components.Based on the double dq transformation,the algorithm firstly transforms the detected voltage signal into positive sequence and negative sequence coordinates,and then,the DC component is quickly extracted through using three consecutive sampling points to transform the positive sequence and negative sequence components in the dq coordinate system after coordinate transformation,and the amplitude and phase of the voltage positive and negative sequence voltages can be obtained through the calculation of the amplitude and phase,respectively.MATLAB/Simulink simulation results verify the advancement and effectiveness of the proposed method.

关 键 词：三相不平衡 电压暂降 对称分量原理 直流分量快速提取 

分 类 号：TM933[电气工程—电力电子与电力传动]