与△/Y_0变压器相联的同步发电机暂态运行时步有限元仿真  

SIMULATION OF A SYNCHRONOUS GENERATOR CONNECTED VIA A DELTA-STAR TRANSFORMER BY TIME-STEPPING FINITE ELEMENT METHOD

作　　者：蒙亮[1] 刘晓芳[1] 罗应立[1] 

机构地区：[1]华北电力大学电气工程学院,北京102206

出　　处：《电网技术》2004年第13期36-39,64,共5页Power System Technology

基　　金：国家自然科学基金资助项目(50277011)

摘　　要：结合时步有限元方法,设计了一个通过△/Y0变压器与无穷大系统及负荷相连接的同步发电机暂态运行过程的仿真程序。在该仿真程序中的发电机模型中考虑了铁心的饱和、转速的变化以及自动电压调节系统(AVR)的调节等对仿真结果的影响,并应用了麦克斯韦应力法计算电磁力矩。在仿真计算中,通过改变仿真程序中相应的参数来模拟不同线路上开关的断开、闭合过程,能方便地对同步发电机受到多种三相对称干扰后的运行过程进行有限元数字仿真。算例计算结果表明了该仿真程序的正确性。Using time-stepping finite element method a simulation program for transient operation of a three-phase generator connected to infinite bus system and power load via a transformer with delta-star wiring is presented, in which the core saturation, the variation of rotation speed and the adjustment of AVR are taken account into generator model, the electromagnetic torque is calculated by Maxwell stress tensor method. In the calculation by means of changing the corresponding parameters in simulation program the processes of switching-on and switching-off of the circuit breakers in different transmission lines are simulated, so the digital finite element simulation for the generator operation under three phase symmetrical disturbances can be conveniently carried out. The results of calculation examples show that this program is correct.

关 键 词：同步发电机 暂态运行 时步有限元方法 仿真 △/Yo变压器 电力系统 仿真模型 

分 类 号：TM341[电气工程—电机] TM743