带直联主变的自并励水轮发电机灭磁仿真

本文介绍了一种带直联主变压器(以下简称主变)的自并励水轮发电机的灭磁仿真结果,为考虑发电机空载特性和主变磁化特性的非线性,利用了发电机空载特性的分析表达式,主变空载磁化曲线的折线表达式,做了发电机-主变组空载误强励、空载下在主变高压侧发生三相短路时和因线路充电引起过电压下灭磁的Simulink仿真.以三峡700MW水轮发电机组的参数为例,给出了有参考价值的结果.

De-excitation of a Self-shunt Exciting Hydraulic Generator with a Directly Connecting Main Transformer

De-excitation simulation result of a self-shunt exciting hydraulic generator with a directly connecting main transformer is given in the paper.To consider non-linearity of no-load characteristic of generator and magnetizing characteristic of transformer,analysis expressions for them are used.De-excitation simulations with Simulink on forced-excitation of no-load generator,abrupt three-phase short-circuit and over voltage caused by charge of long transmission line on high voltage side of main transformer were described.Finally,a simulation example of a self-shunt excited 700 MW hydraulic generator with directly connecting main transformer of Three-gorge power plant is given,which shows useful results for reference.