配电网电压暂降检测算法的仿真比较

在分析有效值算法、瞬时dq变换法和αβ变换法3种电压暂降检测算法基本原理的基础上,应用Matlab/Simulink软件仿真平台,建立了配电网电压暂降的检测模型。针对电压暂降时有无相位跳变以及配电网含谐波源等情况,对3种检测算法的检测性能进行了仿真比较。仿真结果表明:3种检测算法都能检测电压暂降后基波有效值的大小。其中,αβ变换法具有检测响应速度快,检测精度高等特点,而瞬时dq变换法则具有更好的配电网谐波抗干扰能力。

Simulation and Comparison of Voltage Sag Detection Algorithms in Distribution Networks

Based on the analysis of grid voltage sag detection principles,simulation models of voltage sag are established including the algorithms of the root mean square(RMS),the instantaneous dq transformation and the αβ transformation by using Matlab/Simulink software platform.According to the different conditions with and without phase-angle jumping and with the voltage including harmonics when the distributed voltage occurs to the voltage sag,detection performances of three detection algorithms were investigated and compared.The results show that all of the presented algorithms can realize the RMS detection of fundamental voltage after the voltage sagging.Compared with the other two algorithms,the αβ transformation detection algorithm has faster responses and higher accuracy,while the instantaneous dq transformation detection algorithm has better robustness of the harmonic interference in distribution network.