励磁绕组与阻尼绕组耦合效应对大型同步调相机转子暂态电流特性的影响

Influence of coupling effect between excitation winding and damping winding on transient current characteristics of large synchronous condenser

针对大型同步调相机暂态分析时模型精度较低的问题,提出一种考虑励磁绕组与阻尼绕组耦合效应的同步调相机暂态分析精确模型。首先,通过引入特征电抗建立同步调相机考虑励磁绕组与阻尼绕组耦合效应的暂态分析精确模型,并基于励磁电流拟合对特征电抗进行求解。然后,通过三相短路与BC相间短路故障仿真,对比同步调相机传统模型与精确模型的转子暂态电流特性。最后,建立同步调相机机-网暂态仿真模型,分析系统送端交流母线电压波动时同步调相机精确模型的暂态运行特性。研究表明,考虑励磁绕组与阻尼绕组耦合效应时同步调相机转子暂态电流特性的精度更高。三相短路与BC相间短路故障后3个周期内,同步调相机暂态分析精确模型励磁电流峰值平均值的精度分别提高了27.27%和61.53%。

In order to solve the problem of low precision in transient analysis of large synchronous condenser,an accurate transient analysis model of synchronous condenser considering coupling effect of excitation windings and damping windings was proposed.Firstly,an accurate transient analysis model considering the coupling effect of excitation winding and damping winding was established by introducing characteristic reactance,and the characteristic reactance was solved based on excitation current fitting.Then,the transient current characteristics of the rotor were compared between the traditional model and the precise model by simulating the three phase short circuit and the BC phase short circuit fault.Finally,the machine-network transient simulation model of synchronous condenser was established to analyze the transient operation characteristics of the precise model of the synchronous condenser when the AC bus voltage of the system is fluctuating.The results show that accuracy of synchronous condenser of rotor transient current is higher when considering the coupling effect of excitation winding and damping winding.In three cycles after the three phase short circuit fault and the BC phase short circuit fault,the precision of the transient analysis accurate model of the excitation current mean value of peaks increases by 27.27%and 61.53%,respectively.