考虑延时拍数的电压跌落深度通用检测算法及其性能分析  

A Universal Voltage Sag Depth Detection Method Considering Delay Factor and Its Performance Analysis

作　　者：袁艺[1] 尹项根[1] 邹常跃[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室,华中科技大学,湖北省武汉市430074

出　　处：《电力系统自动化》2013年第12期57-62,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50837002);高等学校博士学科点专项科研基金资助项目(20090142110055)~~

摘　　要：电压跌落深度检测是新能源系统按标准实现低电压穿越的基础技术。针对电网电压跌落深度的快速准确检出问题,综合考虑频率偏移及电压谐波的影响,文中给出了一种适应性广的检测算法。该算法在静止坐标系下,通过相隔n个采样周期的2个采样值可快速计算出电压跌落深度。分析了延时拍数n变化时,算法的检测速度及其在频率偏移、波形畸变等非理想条件下的检测精度。通过改变延时拍数n,检测算法能灵活地在快速性与精确性间权衡折中,以适应不同的应用场合。仿真与实验结果验证了所述算法的可行性。The detection of voltage dips is one of the fundamental technologies to achieve renewable energy system low voltage ride-through capability. A flexible voltage sag depth detection method is presented and the influence of frequency drift and harmonics are considered in detail. In a static coordinate system, the voltage dips is calculated by use of two sample values of n sampling interval. The detection speed and precision is also analyzed when n is varying, and under abnormal frequency and waveform conditions. By changing the delay factor n, the method can flexibly compromise between the detection accuracy and detection speed. Simulation results verify the proposed detection method.

关 键 词：电压跌落 检测算法 频率偏移 谐波 延时 低电压穿越 

分 类 号：TM714.2[电气工程—电力系统及自动化]