一种用于检测电压暂降的新方法

电压暂降问题严重影响电网的电能质量,对于此类问题的解决方案还未能同时兼顾实时性与准确性。故本文将通过PSCAD分析比较多种电压暂降检测的方法,并在单相电路瞬时电压dq0坐标变换检测法的基础上,将变换坐标并延迟60°,提出一种新的单相dq坐标变换检测法。最后采用PSCAD仿真三相电力系统发生单相接地的故障工况,分别采用快速傅里叶电压暂降检测法、单相电路瞬时电压dq0坐标变换检测法与新的单相dq坐标变换检测法进行电压暂降检测,从而对比分析得到新的方法检测的优越性。该检测方法为电压暂降的检测提供了新的思路和新的手段。

The New Method of Analyzing Voltage Sags Detection

Voltage sag problems affect the quality of power grid seriously, for solutions to these problems have not been able to take into account the timeliness and accuracy at the same time. This paper focuses on single-phase circuit instantaneous voltage dq0 detection changed method of voltage sags detection method based on the PSCAD, on this basis, transformed and delayed the coordinate by 60°, presents a new single-phase dq coordinate transformation assay. Finally, the advantages of method for the detection of three-phase power system simulation PSCAD single-phase fault this condition were analyzed, through comparing the Fast Fourier、single-phase dq coordinate transformation assay and the new single-phase dq coordinate transformation assay for detecting Voltage Sags. It provides a new way for voltage sags detection method.