Dynamic Matric Predictive Control Of Hydro-turbine Governing System

The hydro-turbine governing system is an integral combination of hydraulic machinery,mechanical system,electrical load and control system for the integration of system.When the hydropower station operates practically,all parts of the hydro-turbine governing system coupling each other and influence each other.Thus,the system is a complex nonlinear time-varying system in essence.Of course,a traditional control method has nothing to do with controlling such a complicate and complex system to be stable in drastic situations because of its limitations.On the other hand,with the development of hydropower energy,the ever-larger hydropower station and the increasing hydraulic unit capacity make it difficult to control the hydro-turbine governing system stable.These above factors will affect the power system,and even seriously affect the stability and safety of hydro power station,if there are no effective control methods.Therefore,it is necessary to study the advanced control methods of the hydro-turbine governing system.For the same reason,the paper facilitates three predictive control methods.(1)The accurate T-S fuzzy model of the nonlinear hydro-turbine governing system is established considering its nonlinear characteristics.Based on the model,the T-S-DMC control method is researched.The stability of the controlled system is proved by using the Lyapunov function.Subsequently,the anti-interference ability and tracking performance of the method is investigated based on the practical operation of the nonlinear hydro-turbine governing system.Furthermore,the numerical experiments also illustrate that the T-S-DMC predictive control method enjoys great advantages over the traditional PID control method.(2)It is difficult for traditional PID control method to control complex nonlinear,time-varying,strong-coupling system.However,dynamic matrix control(DMC)control method has the capacity to overcome the time-varying,strong-coupling characteristics.Thus,a DMC-PID control method is presented to control the six-dimensional nonlinear hydro-turbine governing system by taking advantages of both DMC method and PID method.More specifically,the effectiveness of the method is proved by the numerical experiments.Furthermore,the numerical experiments also illustrates that the method enjoys excellent anti-interference ability and tracking performance.In addition,the method is applied to a class of one-order inertial pure lagging system.And the results show that the DMC-PID methodhave great advantages over the traditional PID control method.(3)Model algorithmic control(MAC)method is researched to control the six-dimensional nonlinear hydro-turbine governing system.The effectiveness of the method is verified by numerical experiments.Subsequently,the anti-interference ability and tracking performance of the method is investigated based on the practical operation of the nonlinear hydro-turbine governing system.Finally,the MAC method is compared with traditional PID method by numerical experiments.From the above discussions and analysis,the results certificate that the three predictive control methods proposed in this paper can control the hydro-turbine governing system to be stable well.In addition,these methods all enjoy excellent control quality.