段俊东, 段志远.一种改进发电机动态稳定的方法[J].河南理工大学学报（自然科学版）,2020,39(6):100-105.

DUAN J D, DUAN Z Y.A method for improving dynamic stability of generator[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(6):100-105.

一种改进发电机动态稳定的方法

段俊东, 段志远

河南理工大学 电气工程与自动化学院，河南 焦作454000

摘要:快速励磁系统在提高电力系统暂态稳定性的同时，会加剧电力系统的低频振荡。本文采用发电机转子等效电势建立发电机与无穷大系统的戴维南等效电路，建立发电机的电磁输出功率表示式，分析励磁调节对发电机电磁功率的影响，并采用固定励磁和自动励磁两种励磁方法进行动态仿真对比。结果表明：在发电机动态振荡过程中，励磁电流按照电压偏差调节，加剧了发电机与系统之间的功角振荡并延长了持续时间；过低的励磁输出造成发电机输出电磁功率减小，在一定程度上影响了发电机的动态稳定性；发电机端电压过电压时，采取限制低励磁的控制对发电机励磁输出电压进行限制控制，经发电机动态仿真计算与自动励磁动态仿真对比，可知在一定程度上可明显改善发电机的动态稳定性，具有较好的实用性。

关键词:发电机;励磁系统;低频振荡;电压偏差;励磁限制

doi:10.16186/j.cnki.1673-9787.2020.6.14

基金项目:国家自然科学基金资助项目（61703144）

收稿日期:2020/02/20

修回日期:2020/03/30

出版日期:2020/11/15

A method for improving dynamic stability of generator

DUAN Jundong, DUAN Zhiyuan

School of Electrical Engineering and Automation， Henan Polytechnic University ，Jiaozuo 454000 ， Henan， China

Abstract:Fast-response excitation system not only improves transient stability， but also aggravates the low -frequency oscillation of power system. The expression of output electromagnetic power of generator was deduced by Thevenin equivalent circuit. The circuit was established by the rotor equivalent voltage and infinite-bus voltage. The influence of excitation regulation on generator electromagnetic power was analyzed by the circuit. Fixed excitation and auto-excitation simulation waveforms were compared. The results showed that， during the dynamic oscillation of the generator， the excitation current was adjusted according to the voltage deviation， which aggravated the power angle oscillation and prolonged the duration between the generator and the system. The excessively low excitation output would cause the output electromagnetic power to decrease， which affected the dynamic stability of the generator to a certain extent. When the generator terminal voltage was overvoltage， low excitation limitation was used to reduce generator excitation output voltage. By analyzing the generator dynamic simulation calculation and the dynamic simulation of the automatic excitation， the dynamic stability of the generator could be significantly improved to a certain extent， and it also had certain applicability.

Key words:generator;excitation system;low-frequency oscillation;voltage deviation;excitation limitation

一种改进发电机动态稳定的方法_段俊东.pdf