【摘要】 该文研究了电站中由电流传感器(CT)以及控制电缆组成的二次侧传变系统在故障行波信号的传变过程中引起的阻尼振荡现象,建立了二次侧传变回路的高频等效电路并得到了对应的复频域传递函数,基于此分析了电缆长度对行波波头振荡频率的影响及相关计算式。利用EMTP/ATP搭建了二次侧传变回路的仿真模型,并通过西北电网750kV"乾-信"线现场记录的行波波形与仿真波形比较验证了模型的合理性。利用Prony分解算法提取波头的振荡频率,并对比了不同电缆长度下的仿真结果与理论计算值,证明了分析的正确性。更多还原

【Abstract】 Damped oscillations can occur in travelling waves due to substation secondary circuits. A high-frequency model of the secondary circuit and its transfer function is used to analyze the influence of the secondary cable’s length and to calculate the oscillation frequency.An EMTP/ATP model was built and verified by comparing with recorded waveforms from the 750 kV "Qian-Xin"transmission line in Northwest China.The Prony method was used to extract the oscillation frequency.Simulation results with different cable lengths show the effectiveness of the Prony method.更多还原