煤矿企业配电网铁磁谐振类型判断研究

Research on ferromagnetic resonance type estimation of distribution network in coal mining enterprises

为了准确判断铁磁谐振类型,从分析铁磁谐振的发生机理出发,采用相模变换理论对三相配电网进行解耦,利用0模电路建立非线性网络铁磁谐振的数学模型,以配电网中各变电站不同运行方式下对地容抗与互感器励磁电抗xC0/xLe的值为依据,利用Peterson谐振曲线定性的判断出谐振频率的区间,运用ATP-EMTP软件对配电网发生单相接地故障和断线故障进行仿真表明发生的铁磁谐振主要为分频谐振和基频谐振,与现场事故分析相符,对预防路线故障具有一定应用价值。

In order to estimate the ferromagnetic resonance type accurately,phase-mode transformation theory is choosed to decouple a three-phase distribution network,uses the 0 module circuit to establish the mathematical model for nonlinear network ferromagnetic resonance based on the analysis of the mechanism of ferromagnetic resonance,and Peterson resonance curve is applied to find the resonance frequency range qualitatively according to the ratio of each substation capacitance and transformer magnetizing reactance under different operation modes. At last,according to the ATP-EMTP software,the single-phase earth fault model and the broken-line fault model are built,and the simulation research are performed. The results show that the ferromagnetic resonance of substation is fractional frequency resonance and fundamental frequency resonance,and that the method proposed is suitable for predicting line fault.