计及相位影响的间谐波与电压闪变的定量关系研究

Research on quantitative relationship between inter-harmonics and voltage flicker considering the phase influence

电力系统闪变与间谐波存在密切的关系,文中从信号调制理论的角度进一步揭示了两者之间的定量关系。一方面,在充分考虑相位参数的影响下,分析了间谐波叠加在工频信号上所引起的幅度调制和相位调制效应,指出只有发生幅度调制时,间谐波才会引起信号包络的波动。另一方面,从闪变信号的数学模型推导出由调幅波所引起的间谐波参数的定量计算公式。基于MATLAB软件的仿真验证了结论的正确性。

There is a close relation between flicker and inter-harmonics in power system. This paper further reveals the quantitative relationship between them from the perspective of signal modulation theory. On the one hand, consid- ering the phase parameter influence, it analyzes the amplitude modulation and phase modulation effect when the inter-harmonic is superposed on the power frequency signal, and concludes that only when the amplitude modulation occurs, the inter-harmonic will cause the signal envelope fluctuation. On the other hand, the quantitative calculation formula of the inter-harmonic parameters caused by amplitude modulation wave is deduced from the flicker signal mathematical model. Simulations based on the MATLAB software verify the correctness of the conclusions.