基于信号短时延迟算法单相电压暂降检测方法

Single-phase Voltage Sag Detection Method Based on Signal Short-Time Delay Algorithm

快速、准确检测电网电压暂降深度是进行电压暂降治理的前提与关键。为此提出了一种基于信号短时延迟的电压暂降检测方法。该算法将单相电压信号延迟若干个采样周期以构造其正交信号,从而可采用基于dq变换的瞬时无功功率理论对瞬时电压进行快速准确检测;同时通过设置延迟时间并结合EMAF算法将随机噪声控制在检测系统所能承受的范围内,以满足工业应用对噪声干扰性能的要求。最后,MATLAB/Simulink仿真结果验证了该算法的先进性与实用性。

Fast and accurate detection of the depth of power grid voltage sag is the prerequisite and key for voltage sag management.In this paper,a voltage sag detection method based on signal short delay was proposed.In this algorithm,the single-phase signal was delayed by several sampling periods to construct its orthogonal voltage signal and then the voltage was detected according to the dq transformation of instantaneous reactive power theory.At the same time,by setting the delay time and combining with the EMAF algorithm,the algorithm could control the noise within the tolerable range,so as to realize the rapid and accurate detection of the voltage sag characteristic quantity in the actual industrial application.Finally,the effectiveness and practicability of the method were verified by MATLAB/Simulink simulation.