基于小波变换的电力系统谐波检测方法研究

摘要

Based on the wavelet multi-resolution analysis, a kind of sampling frequency selection method is proposed. It is effective in extracting the fundamental wave signal and the given harmonics signal. Harmonics signal is analyzed with wavelet transform, reasonable decomposition levels are selected, and then the harmonic detection results caused by sampling frequency in different ranges are discussed. The correctness of the method is tested by simulation. Finally, the method is used in F2812DSP based harmonic detection device for long time operation and test in the distribution network automation system. Results show that the method has a fast computing speed, a quick reaction, and a real-time tracking of harmonic changes.%基于小波多分辨分析,提出了一种采样频率的选择方法,可有效地提取基波信号和谐波信号.首先将谐波信号进行小波分析,选择合理的分解层数,在此基础上讨论了在不同范围内的采样频率对谐波检测的效果所造成的影响,通过仿真实验验证了所提出的采样频率选择方法的正确性.将该方法用于基于F2812DSP的谐波检测装置中,在配网自动化系统中进行长时间运行与测试,结果表明该方法具有计算速度快,反应灵敏等特点,能够实时跟踪谐波的变化.