电压互感器的铁磁谐振过电压分析

介绍了电力系统铁磁谐振的产生机理,对它进行数学模型的建立及理论分析.并首次提出了将时频域分析法运用到对铁磁谐振过电压的分析中.时域上,将铁磁谐振系统中的线性部分与非线性部分分开,用传递函数来表征线性部分,用描述函数来表征非线性部分,建立的压变描述函数使计算过程更趋简单.频域上则借鉴非线性振动理论中小参数法分析基频谐振,平均法分析1/3分频谐振.通过对时域、频域的分析,为消谐装置的设计提供了相应的理论依据.

The generating mechanism of ferromagnetic resonance in power system is introduced as well as the establishment and theory analysis of its mathematical model. The time and frequency domain analysis method is firstly proposed to analyze the ferromagnetic resonance over- voltage. In time domain, the linear and nonlinear parts in ferromagnetic resonance system are separated, which is characterized by transfer function and describing function respectively. The established describing function of pressure variable makes the calculation procedure much easier. In frequency domain, small parameter method in nonlinear vibration theory is referred to analyze the fundamental frequency resonance, and the average method is used to analyze 1/3 frequency resonance. Through the analysis of time and frequency domain, the corresponding theory basis is provided for the design of resonance suppression devices.