单相电路电压暂降的求导检测算法

Derivation detection algorithm for single-phase circuit voltage sags

针对常规的单相电压暂降检测方法存在计算量大、信号不同步而影响检测结果的准确性等问题,提出了一种求导检测算法。该算法利用电压的瞬时值与其导数构造二元一次方程,通过求解方程来实现对电压暂降的实时检测,解决了矢量旋转坐标变换法计算量大与信号不同步的问题。仿真结果表明,该算法计算量小,检测时间短,精度高,满足检测的快速性要求。

In view of problem that common detection method of single-phase circuit voltage sags has huge calculated amount and its accuracy of detection result may be affected by unsynchronized signals, a derivation detection algorithm was proposed. The algorithm uses instantaneous voltage value and its derivative to construct linear equation in two unknowns, achieves real-time detection of voltage sags by solving the equation, and solves the problem of huge calculated amount and unsynchronized signals. The simulation results show that the algorithm has little calculated amount, short detection time and high precision, which can meet speedability requirements of detection.