同步发电机短路故障参数的扩充Prony算法辨识

Parameter estimation of synchronous generator fault of short-circuit based on expansion Prony algorithm

针对同步发电机短路故障问题,在分析同步发电机短路电流信号特点的基础上,提出了基于扩充Prony算法的同步发电机三相短路电流分段分析方法,建立了同步发电机突然三相短路电路模型。通过仿真分析得到拟合误差曲线以及A、B两相短路电流的模态信息。仿真结果表明:算法能够有效的提取各相电流信号的幅值、频率、相位和阻尼参数等模态信息,信号拟合精确度在10-5以上,是一种有效的同步发电机短路电流分析算法。

On the basis of analyzing the characteristics of synchronous generator short - circuit current, a novel segmental analysis method based on expansion Prony algorithm was proposed in order to analyze the fault current of synchronous generator with short-circuit in three phases. A circuit model of synchronous generator with sudden short-circuits in three phases was constructed. The fitting error curves and current modal information of A,B phase are obtained. The simulation results show that expansion Prony algorithm can obtain magnitude, frequency, phase, and damping parameter of each phase current. The fitting precision of expansion Prony algorithm exceeded 10^-5. Therefore, the simulation results verify the effectiveness of expansion Prony algorithm.