摘要
基于小信号分析理论,构建了用于电力系统次同步振荡和低频振荡分析的统一系统线性化模型,并进行了适当简化,主要包含轴系、汽轮机及其调速系统、发电机及其励磁系统和输电线路模型,并采用复转矩系数法对机械阻尼和电气阻尼特性进行了分析。不同参数配置对系统阻尼的影响不同,重点考虑了调速系统参数(油动机行程反馈时间常数T2、调速器转速前馈系数K2、汽轮机高压容积时间常数Tcs及再热器蒸汽容积时间常数Trhs)和电气参数对系统阻尼的影响。结果表明:调速系统参数对系统阻尼的影响主要集中在低频段内,并会提供较大的负阻尼;而电气参数对系统阻尼的影响则主要在次同步频段内。研究结果可为电力系统低频振荡和次同步振荡的抑制提供依据。
On the basis of small signal analysis theory,a unified system linearization model for subsynchronous oscillation and low frequency oscillation analysis is established and properly simplified.The shaft model,steam turbine and governor,generator and its excitation system and transmission line model are included.The complex torque coefficient approach is adopted to analyze the system’s mechanical damping and mechanical damping characteristics.Different parameter configurations have different influences on the system’s damping characteristics,the effects of governor system parameters,such as time constant of servomotor position feedback T2,governor speed feedforward coefficient K2,time constant of turbine high pressure volume Tcs and time constant of reheater steam volume Trhs,as well as the electric parameters,are mainly considered.The results show that,the effects of the governor parameters on the system’s damping characteristics focus on low frequency range,while that of the electric parameters focus on subsynchronous frequency range.The results of the study can provide the basis for inhibiting low frequency oscillation and secondary synchronous oscillation of the power systems.
作者
张玉皓
杨昆
顾煜炯
马晓腾
赵鹏程
ZHANG Yuhao;YANG Kun;GU Yujiong;MA Xiaoteng;ZHAO Pengcheng(Power and Mechanical Engineering,North China Electric Power University Beijing 102206,China)
出处
《热力发电》
CAS
北大核心
2019年第8期1-7,共7页
Thermal Power Generation
关键词
低频振荡
次同步振荡
阻尼特性
小信号
复转矩系数法
汽轮机
轴系
low frequency oscillation
subsynchronous oscillation
damping characteristics
small signal
complex torque coefficient approach
steam turbine
shafting system
