互联非线性系统反馈主导控制设计方法及汽门开度控制应用  

Stability control of interconnected nonlinear systems based on feedback domination method and application on turbine valve

作　　者：常乃超[1] 陈来军[2] 侯云鹤[3] 

机构地区：[1]国家电网公司,北京100032 [2]清华大学电机系电力系统国家重点实验室,北京100084 [3]华中科技大学电力工程系,湖北武汉430074

出　　处：《控制理论与应用》2014年第6期687-692,共6页Control Theory & Applications

基　　金：国家电网公司科技资助项目(SGCC–MPLG001(001–031)–2012);国家自然科学基金创新研究群体资助项目(51321005)

摘　　要：分析了电力系统非线性的数学性质,指出电力系统非线性是一种有界非线性.在此基础上,将反馈主导方法(feedback domination method,FDM)引入多机电力系统非线性控制.该方法与反馈线性化方法不同;反馈线性化方法是通过反馈将原非线性系统转化为线性系统,反馈主导方法则是通过反馈将原非线性系统转换为特定形式的非线性系统,该特定形式的非线性系统的动态由反馈引入的非线性部分主导.以多机系统非线性汽门控制问题为例,设计了反馈主导非线性汽门控制器,该控制器仅包含本地量测量,易于实现.数值仿真表明,多机系统反馈主导非线性汽门控制器可显著提高电力系统暂态稳定性.Mathematical characteristics of power system nonlinearity are analyzed. It is shown that the nonlinearity between generator output power and node voltage is a kind of bounded nonlinearity. According to the bounded nonlinearity, we introduce the feedback domination method （FDM） for controlling the nonlinear multi-machine power systems. Being different from the feedback linearization method （FLM） which transforms a nonlinear system into a linear system through nonlinear feedback, FDM transforms a nonlinear system into another nonlinear system with a particular form through nonlinear feedback. The dynamics of the transformed nonlinear system is dominated by the nonlinear part in the feedback loop. As an example, feedback domination method （FDM） is applied to design the nonlinear turbine valve control in multi-machine power systems. The nonlinear valve control law constructed for generators only includes local measurements, so that it is easy to be implemented. Numerical simulations demonstrate that the nonlinear valve control law based on FDM effectively improves transient stability in power system.

关 键 词：非线性控制 反馈主导 电力系统 汽门开度控制 

分 类 号：TM921.5[电气工程—电力电子与电力传动]