基于时步有限元的抽水蓄能电机瞬态参数计算方法的对比

Contrastive Study on Calculation Methods of Transient Parameters of Pumped Storage Machine Based on Time-Stepping Finite Element Method

为准确计算抽水蓄能电机分别运行于发电及电动工况时的瞬态参数,本文基于单元电机建立了抽水蓄能电机的场路耦合时步有限元模型。采用包络线法得到空载突然三相短路时电机的瞬态参数(简称包络线法),同时用冻结磁导率法得到空载突然三相短路时定转子绕组漏抗及电枢反应电抗,由各瞬态参数定义式得到瞬态参数(简称冻结磁导率法)。将冻结磁导率法计算值与设计值分别代入短路电流解析式中得到短路电流波形,与时步有限元仿真波形相比,冻结磁导率法计算波形与之更为接近。将这两种瞬态参数计算方法应用于实验室6极反装水轮发电机,与实验结果对比验证了两种计算方法的有效性和可行性。

In order to accurately calculate the transient parameters of pumped storage motor when it runs on power generation and motor conditions respectively, the field-circuit coupled time-stepping finite element(FEM) model which is based on unit machine is built in this paper. The transient parameters under three phases sudden short status are obtained by envelope method(for short envelope method). Simultaneously, the leakage reactance of stator and rotor windings and armature reaction reactances under three phases sudden short status are calculated by frozen permeability method, and the transient parameters are obtained by substituting the values into transient parameter definition formula(for short frozen permeability method). Then the design and calculated values of frozen permeability method are substituted into the short-circuit current analytical formula respectively, and compared with the FEM simulation waveform, the waveform of frozen permeability method is closer. Finally, the two calculation methods are used in the 6 poles anti-mounted hydro-generator, and compared with the experimental results, the effectiveness and feasibility of the two methods are verified.