多馈入直流输电系统小信号调制器的协调优化整定  

COORDINATION AND OPTIMIZATION OF SMALL SIGNAL MODULATORS IN MULTI-INFEED HVDC SYSTEMS

作　　者：金丽成[1] 刘海峰[1] 徐政[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2003年第16期10-15,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究专项经费资助项目 (G19980 2 0 310 );国家自然科学基金资助项目 (5 0 2 770 34)

摘　　要：分析了多馈入交直流并联输电系统中各直流系统之间可能存在的不良相互作用。提出了对各直流小信号调制器参数进行协调整定的必要性 ,并将参数的协调整定问题归结为控制器结构已知但有若干未定参数可供优化的数学规划问题 ,所选的目标函数是与各交流联络线的有功功率和各发电机的功角相关的。基于NETOMAC软件平台 ,采用程序自带的非线性优化模块 ,可同时对这些参数进行优化 ,这种参数整定方法本身已考虑了交直流电力系统固有的非线性特性而不必显式导出整个系统的数学模型 ,因而不需要进行网络简化或线性化近似 ,这种方法对大规模交直流电力系统的控制器参数整定具有独到的优势。构造了一个含有两个区域间低频振荡模式的双馈入交直流输电系统 ,并对该系统的各直流小信号调制器参数进行了协调优化整定 ,仿真结果表明 ,经过协调优化后得到的直流小信号调制器能提高整个交直流系统的阻尼性能 。Because there may exist negative interactions among HVDC small signal modulation controllers in multi-infeed HVDC systems, it is necessary to tune the parameters of the HVDC modulators coordinately. This is equivalent to solve a nonlinear programming problem provided that the structures of the HVDC modulators are known. The objective function is considered to consist of the active power in the AC inter-ties and the rotor angles of all the generators. The parameters of the HVDC modulators can be optimized simultaneously with an inherent nonlinear optimization module of NETOMAC. The presented parameter tuning procedure has itself included the non-linear nature of the AC/DC system and does not need to manually derive the explicit mathematical model of the whole system, and hence system simplification and linearization are not needed. A dual-infeed HVDC system with two lightly damped inter-regional oscillation modes is constructed to demonstrate the effectiveness of the presented parameter tuning procedure. Simulation results show that the optimized HVDC modulators can improve the damping of overall power oscillations in the dual-infeed HVDC system. Furthermore, the optimized modulators are robust to changes in system configurations, operating conditions and fault modes.

关 键 词：直流输电系统 小信号调制器 协调控制 参数优化 

分 类 号：TN761[电子电信—电路与系统]