基于复小波变换和Teager能量算子的电压跌落检测方法研究

针对电压跌落的跳变相位、起止时刻和跌落幅值这三个特征量有效检测问题,提出了基于复小波变换和Teager能量算子的电压跌落检测方法。详细研究了复小波的构造原理以及它和Teager能量算子在检测电压跌落上的应用。对于含噪的电压跌落信号,利用Teager能量算子对db4复小波变换后得到的近似信号进行跌落幅值的检测,利用db4复小波变换检测发生跌落前后的两个近似信号的相位,以相位差的形式得出电压跌落发生的起止时刻与跳变相位。Matlab仿真结果验证了算法的抗干扰性与实时性。

Research of voltage sag detection method based on complex wavelet transform and Teager energy operator

To effectively detect jump phase, start and end time and sag amplitude of voltage sag, a method based on complex wavelet transform and teager energy operator is proposed in this paper to detect these three characteristics. The construction principle of complex wavelet and its application to the detection of voltage sag with teager energy operator are studied in detail. For the voltage sag signal with noise, the teager energy operator is used to detect the sag amplitude of the approximate signal obtained by the db4 real wavelet transform, and the db4 complex wavelet transform is used to detect the phase of two approximate signals before and after the sag, then the start and end time and jump phase will be given from the difference of two phases. The anti-interference and real-time performance of the algorithm is verified by matlab simulation results.