电动及发电工况下抽水蓄能发电电动机的电磁特性分析

Analysis of Electromagnetic Characteristics of Pumped Storage Generator-Motor under the Working Condition of Motor and Generator

为研究抽水蓄能发电电动机电动和发电两种工况对电机自身及电力系统的影响问题,以广州抽水蓄能电站B厂内一台发电电动机为例,建立二维有限元模型,结合有限元和场路耦合方法,联立求解得到两种工况的磁场分布,并对比分析了两种工况下的磁力线分布、气隙磁密、电磁转矩等。结果表明,与发电工况相比,电动工况下单个磁极内的磁场分布不均匀程度更高,磁力线偏移更大,转子所受电磁转矩的波动更强,对电机自身及系统稳定性的影响更高。研究结果可为抽水蓄能发电电动机组长期稳定运行提供参考。

In order to study the influence of the pumped storage generator-motor on the itself and electric power system at the working condition of motor and generator,taking agenerator-motor of the Guangzhou pumped storage B as an example,a two-dimensional finite element model was established.Then coupling finite element method and field circuit coupling method was used to solve the model and the magnetic field distributions at two operating conditions were obtained.Compared with the magnetic field distribution,the air gap flux density and the electromagnetic torque,the results show that comparing with the generator operating condition,the single pole＇s magnetic field distribution is more non-uniform,the rotor＇s electromagnetic torque is more powerful,and the impact on the stability of the generator-motor itself and the electric power system is much higher.The research results can provide reference for long-term stable operation of pumped storage generator-motor.