兼顾功角稳定的水电机组调节系统模糊滑模控制器的设计  

Design of Fuzzy Sliding Mode Controller for Hydro-turbine Regulating System Considering Power Angle Stability

作　　者：孔繁镍[1] 蓝天顺 骆铭 夏家辉 陆文玲 KONG Fan-nie;LAN Tian-shun;LUO Ming;XIA Jia-hui;LU Wen-ling(School of Electrical Engineering,Guangxi University,Nanning 530004,Guangxi,China;School of Intelligent Manufacturing,Nanning College for Vocational Technology,Nanning 530008,Guangxi,China)

机构地区：[1]广西大学电气工程学院,广西南宁530004 [2]南宁职业技术学院智能制造学院,广西南宁530008

出　　处：《中国农村水利水电》2022年第10期190-197,共8页China Rural Water and Hydropower

基　　金：广西重点研发计划(桂科AB18281009)。

摘　　要：水电机组调节系统对水电站的安全稳定运行起着关键的作用,不当的调节参数会弱化系统的阻尼,诱发水电机组功角振荡行为。为保证水电机组稳定运行,提出了一种兼顾功角稳定的模糊滑模控制策略。首先,考虑水力与机电系统暂态特性之间的相互影响,建立了包含弹性水击的水轮机内特性模型和三阶发电机模型的水电机组调节系统模型,并分析不同工况下系统的振荡特性。其次,通过将Δδ及ΔV_(t)引入滑模面函数,改善控制器输出对系统阻尼的影响,提升系统功角输出的稳定性。在此基础上,以系统机械功率为参考指标,设计了一种基于指数规律调整的变速趋近律,使收敛速度能够随工况变化及时调整。不同工况下的仿真结果表明,提出的控制律在系统受到功率扰动时,能够有效改善水电机组功角振荡行为,抑制系统低频振荡的发生,提高了系统的稳定性和控制器的鲁棒性。The hydro-turbine regulating system plays a key role in the safe and stable operation of hydropower plants.Improper regulation parameters can weaken the damping of the system and induce hydropower unit power angle oscillation behavior.In order to ensure the stable operation of hydropower units,this paper proposes a fuzzy sliding mode control strategy based on improved reaching law and sliding manifold.Firstly,considering the mutual influence between the transient characteristics of hydraulic and electromechanical systems,a hydro-turbine regulating system containing the internal characteristics of the hydraulic turbine with elastic water hammer and the third-order generator model is established,and the oscillation characteristics of the system under different operating conditions are analyzed.Secondly,the stability of the system rotor angle is enhanced by introducingΔδandΔV_(t) into the sliding manifold to improve the influence of the controller output on the system damping.On this basis,taking the mechanical power of the system as the reference index,a variable speed reaching law based on the exponential law adjustment is designed,so that the convergence speed can be adjusted in time with the change of working conditions.Simulation results under different working conditions show that the proposed control law can effectively improve the power-angle oscillation behavior of the hydropower unit and suppress the occurrence of low-frequency oscillation of the system when the system is subject to power disturbance,which enhances the stability of the system and the robustness of the controller.

关 键 词：水电机组调节系统 滑模控制 模糊控制 变速趋近律 功角稳定 

分 类 号：TV73[水利工程—水利水电工程]