水轮机及其调速系统对电力系统低频振荡的影响分析  

The Study of Low-Frequency Oscillations of Hydro-turbine Speed Control System in Power System

作　　者：周益华[1] 竺炜[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410004

出　　处：《中国水能及电气化》2012年第4期13-18,共6页China Water Power & Electrification

基　　金：湖南省自然科学基金资助项目(11JJ6032);湖南省科技计划资助项目(2010FJ4095)

摘　　要：基于水轮机及其调速系统的典型模型,推导了转子的机械阻尼力矩系数;采用非线性规划的方法,对典型参数范围内的机械阻尼力矩系数进行了极值分析。分析发现,水轮机及其调速系统提供的负阻尼转矩,可能导致电力系统呈现弱阻尼甚至负阻尼状态,进而可能发生强迫共振和负阻尼两种形式的低频振荡。该分析结果在频域和时域仿真中都得到了验证,对低频振荡的分析及抑制有现实意义。Based on hydro-turbine speed control system typical model, derived the rotor mechanical damping torque coefficient; the use of non-linear programming method, within the typical parameters, the extreme value of mechanical torque coefficient is analyzed. Analysis found that hydro-turbine speed control system provide a negative damping torque that may cause the power system to become weak or even negative damping, which may occur two forms of low-frequency oscillation： negative and resonance oscillation. Results of the analysis in the frequency domain and time domain simulation have been verified. Research and analysis is practical significance for suppression of low frequency oscillation.

关 键 词：水轮机 调速系统 负阻尼转矩 电力系统低频振荡 

分 类 号：TM712[电气工程—电力系统及自动化]