摘要
首先考虑 UPFC装置与电力系统串联和并联的两部分之间耦合直流电容的动态 ,建立了具有 UPFC的输电系统的动态数学模型。在此基础上 ,对 UPFC的 4个控制变量进行分析 ,提出了控制变量 m1,m2 和φ1的线性控制规律 ,并运用基于微分几何理论的仿射非线性系统反馈精确线性化和动态反馈原理及方法 ,得到了控制变量φ2 的非线性最优控制律的解析表达式 ,从而提出了UPFC的线性与非线性最优混合控制策略。控制策略的测量量均可本地化 ,以利于工程应用。仿真结果表明在文中所给出的非线性控制器作用下 ,UPFC能有效地改善电力系统的动态品质和暂态稳定性。
This paper builds up the model of a transmission system with the UPFC and proposes a nonlinear control strategy of UPFC. In the model, the dynamic performance of the DC capacitor, which is coupled with two parts of the UPFC in shunt and in series with transmission line, is considered. On the basis of the model, the linear control laws of m1, m2 and φ1 are put forward, and the analytic expression of the nonlinear control law of control variable φ2 for the UPFC is obtained by using the approach of designing the nonlinear optimal controller based on the differential geometry theory. As a result, the control strategy for UPFC including linear and nonlinear laws is obtained, in which all measure variables can be localized for engineering implementations. Simulation results verify its efficiency in improving dynamic quality and transient stability of power systems.
出处
《电力系统自动化》
EI
CSCD
北大核心
2001年第19期1-5,共5页
Automation of Electric Power Systems
基金
国家重点基础研究专项经费 (G19980 2 0 30 9)
国家自然科学基金 (5 98372 70 )
清华大学博士点基金资助项目
关键词
统一潮流控制器
非线性控制
电力系统稳定性
输电线路
数学模型
Capacitors
Computer simulation
DC power transmission
Electric power systems
Feedback
Mathematical models
Optimal control systems
Transients
