计及励磁系统的同步电机时步有限元模型研究

Research on Time-stepping Finite Element Model of Synchronous Generator with Excitation System

为更全面和准确地反映同步电机实际的运行状态,在基于S函数建立的单机-无穷大系统场-路-网耦合时步有限元模型中增加AVR(自动励磁调节器)及PSS(电力系统稳定器)模型。对几种典型小扰动和大扰动工况分别运用经典派克方程模型和时步有限元模型进行仿真求解,讨论分析非线性因素以及励磁系统的调节作用对于电机运行特性和系统响应产生的影响。结果表明,计及励磁系统的时步有限元模型能更准确地体现电机真实的运行状况。最后,实测10kW 6极反装凸极电机空载三相短路数据,和仿真结果吻合较好,证明了计算方法的正确性。

In order to research the operating condition of synchronous generator more accurately, AVR(automatic excitation regulation) and PSS(power system stabilizer) are added to field-circuit-network coupled time-stepping finite element model of single machine infinite system, which is based on S-function. The small and big disturbance were calculated to compare and analyze the effects of non-linear factor and excitation system on the machine operating characteristic and system response. The result shows that the time-stepping finite element model considering excitation system can reflect the running condition of machine more factually. Three-phase no-load short-circuit test of 10kW 6 salient-poles reversed machine is carried out, the measured waveform and simulation results are in great agreement, verifies the accuracy of the method.