汽轮发电机失磁异步过程  

Loss of Excitation and Asynchronization Process of Steam Turbine Generator

作　　者：王道元[1] 徐余法[1] 刘昌奇 王敬莆 

机构地区：[1]上海电机学院电气学院,上海200240

出　　处：《广东电力》2015年第10期63-66,96,共5页Guangdong Electric Power

基　　金：上海市教委科研创新重点项目(09ZZ211);上海市自然科学基金项目(11ZR1413900)

摘　　要：针对汽轮发电机失磁故障对网机之间的稳定性造成的危害,分析了汽轮发电机失磁异步过程。以发电机失磁过程中的暂态特性和稳态特性为研究对象,利用派克变换原理,采用MATLAB/Simulink软件工具箱搭建单机无穷大系统,先以发电机失磁故障的暂态过程为基础,对定子电流、有功功率、无功功率、功角等物理量在此过程中的暂态特性进行分析;再以50 MW发电机为仿真实例,研究其发生失磁故障时的稳态变化。仿真结果表明:发电机带额定负荷发生失磁故障时,系统参数波动范围大,振动较严重,进入稳态异步运行的时间较长,对电机和电网产生严重危害。In allusion to damages to stability of power grid and generator caused by loss of excitation of steam turbine genera- tor, this paper analyzes loss of excitation and asynchrounization process of the steam turbine generator. Taking transient characteristic and steady-state characteristic in process of loss of excitation for research objects, Park transformation princi- ple and MATLAB/Simulink software tool cabinet was used for establishing single machine infinite bus system. Transient characteristics of stator current, active power, reactive power and power angle were analyzed on the basis of transient process of loss of excitation of the steam turbine generator firstly, then based on simulation example of 50 MW generator, steady-state change at the time of fault of loss of excitation was studied. Simulation results indicate that when loss of excita- tion fault happens to the generator with rated load, fluctuation range of system parameters are large, vibration is relatively serious and time for entering into steady-state asynchronous operation is longer which may seriously damage the generator and power grid.

关 键 词：汽轮发电机 暂态特性 稳态特性 失磁 额定负荷 

分 类 号：TM311[电气工程—电机]