基于滑模变结构控制的水轮机调节系统  

An Improved Hydro-Turbine Governing System Model and Design of Sliding Mode Variable Structure Controller

作　　者：寇攀高[1] 周建中[1] 张孝远[1] 王常青[1] 

机构地区：[1]华中科技大学水电与数字化工程学院,湖北省武汉市430074

出　　处：《电网技术》2012年第8期157-162,共6页Power System Technology

基　　金：国家自然科学基金项目(51079057;51039005);高等学校博士学科点专项科研基金(20100142110012)~~

摘　　要：针对传统PID控制策略随水轮机工况切换、参数时变适应性差的问题,将滑模变结构控制引入到水轮机调节系统中;考虑到传统水轮机调节系统状态空间模型忽略了机组转速给定项无法仿真机组空载扰动且线性最优控制下机组转速存在稳态误差的问题,推导出一种三控制输入的水轮机调节系统状态方程,揭示了状态方程稳态误差产生机制,提出了消除状态方程稳态误差的方法,在此基础上设计了水轮机调节系统的滑模变结构控制器。仿真试验表明,改进的三控制输入水轮机调节系统状态空间方程是一种有效的水轮机调节系统模型;滑模变结构控制器性能优于PID控制器,对水轮机调节系统的物理参数摄动、运行工况变化、各种幅度扰动具有更好的鲁棒性、适应性。In allusion to insufficient adaptability of traditional PID control strategy to operational condition change and time-varying parameters of hydro-turbine, the sliding mode variable structure control was led into hydro-turbine governing system （HTGS）. Considering the problems that in state space model of traditional of HTGS due to neglecting the rotational speed reference of hydro-turbine unit the no-load disturbance of hydro-turbine unit could not be simulated and there was steady state error in rotational speed of hydro-turbine unit, a state equation of HTGS with three control inputs was derived to reveal the mechanism of causing steady state error in state equation, and a method to eliminate the steady state error in state equation was proposed. On this basis a sliding mode variable structure controller for HTGS was designed. Simulation results showed that the state space equation of improved HYGS with three control inputs was an effective model of HTGS; the performance of sliding mode variable structure controller was better than that of P1D controller, and possessed better robustness and adaptability to physical parameter perturbation of HTGS, changes of operational conditions and disturbances with various magnitudes.

关 键 词：水轮机调节系统 滑模变结构控制 控制输入 状态空间 极点配置法 

分 类 号：TM62[电气工程—电力系统及自动化]