文档介绍：摘要
同步发电机励磁系统的控制性能不仅影响着电力系统中电能质量、电压的稳定,系统的功率因数和稳定运行极限,而且影响着电力系统的暂态性能、动态性能,特别是对系统的低频振荡,次同步振荡的抑制。按提供励磁功率的方式, 励磁系统分为他励和自励两种形式,前者的励磁功率取自与发电机同轴的励磁发电机,后者的励磁功率由发电机定子提供。对目前存在的自励系统,其励磁功率是由同步发电机的机端电压经励磁变压器降压, 在线检测机端电压和负载电流,按照一定的规律来调节相控整流器的控制角,以满足系统的增、减磁的需要。
同步发电机励磁系统是同步发电机重要组成部分,其主要任务是通过调节发电机励磁绕组的电流来控制发电机的端电压,并使其维持在一个恒定的水平上。要实现这个目的,就必须根据负载的大小和性质随时调节发电机的励磁电流,显然,这一调节过程只有通过自动励磁控制装置才能实现。随着科学技术和电力系统的发展,对同步发电机励磁装置的要求也在不断提高。同时随着大规模集成电路技术和计算机技术的发展,采用微处理器作为硬件控制核心的微机励磁装置将成为今后自动励磁装置的发展方向。
本文针对同步发电机论述了微机励磁装置的特点及发展现状,分析了励磁调节器的原理和设计方法,提出了同步发电机自动励磁装置的设计思路,并对发电机励磁系统进行建模与仿真。
关健词:同步发电机,励磁,MATLAB\SIMULINK
Abstract
Synchronous generator excitation system control performance not only affects the power system of power quality, voltage stability, the power factor of system and stable operation, but also affects the limit of the power system transient performance,dynamic performance, especially on the system frequency oscillation times synchronous oscillation of inhibition. By the way, provide excitation power into his excitation control system shunt and interpret two forms, former excitation power from the exciting generator with generator coaxial, which provided by the generator stator excitation power. The existing motivated excitation system, and its power is the machine by synchronous generator voltage transformer step-down, again by excitation by silicon-controlled phased rectifier to generators provide after rectifying on-line detection machine, excitation voltage terminal and load current, according to certain rules to regulate phased rectifier control Angle to satisfy the system increase and decrease ic needs.
Synchronous generator excitation control of synchronous generator system is an ponent of the system, whose main task is by regulating the excitation current to control the winding of the generator terminal voltage, and to be maintained at a constant level. To achieve this objective, it is necessary in accordance with the size and nature of the load at any time adjust the gene