基于瞬时对称分量变换的单相电压暂降检测  

Detection of Single-phase Voltage Sag Based on Instantaneous Symmetrical Component Transform

作　　者：李希年 庞清乐[1] 孙静[1] 

机构地区：[1]山东工商学院信息与电子工程学院,烟台264005

出　　处：《电力系统及其自动化学报》2018年第1期76-80,87,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61403236);山东省教育厅科技发展规划资助项目(J15LN10);烟台市科技计划资助项目(2014ZH079;2016ZH055)

摘　　要：电压暂降影响工业敏感设备的正常运行,甚至导致连续生产过程的中断,是最严重的工业电能质量问题之一,其快速检测是保障工业正常连续生产的关键前提。本文研究基于瞬时对称分量变换的电压暂降检测法。首先,将单相电压看作两相为零的三相不对称电压,应用瞬时对称分量法提取其正序分量;然后,基于复域abc/dq变换法计算电压的幅值与相角,实现电压暂降的检测。与其他检测法不同,所提方法利用相量所包含的相角信息,只需进行复域d变换或者q变换,计算量减小,降低了对设备的硬件要求。Matlab下的仿真结果证明了该方法的有效性。Voltage sag is one of the most serious power quality problems that affects the normal operation of industrial sensitive equipment and even leads to the interruption of continuous production process. Therefore, its detection is the key premise to guarantee the continuous normal industrial production. In this paper, voltage sag detection method is studied based on instantaneous symmetrical component （ISC） transform. First, a single-phase voltage is regarded as a three-phase asymmetrical voltage with two phase voltages being zero, and ISC method is used to extract the positive-se- quence component. Then, the voltage＇ s amplitude and phase angle are calculated by abc/dq transform in complex do- main to realize the detection of voltage sag. Unlike other methods, the proposed method only uses d or q transform in complex domain by taking advantage of the phase angle information contained in the phase quantities, thus the computa- tion load and hardware requirements are reduced. Simulation results in Matlab validate the effectiveness of the proposed method.

关 键 词：电压暂降 同步坐标变换 瞬时对称分量 复域 检测 

分 类 号：TM93[电气工程—电力电子与电力传动]