Research On Integrated Control Strategy Of Hydraulic Turbine Generator Unit

Synchronous generator excitation systems and water turbine governors are veryimportant control equipments in the power plant, both of which play a vital role to ensurethe eletricity quality, and the power systems to run safely and stably. Traditional controlmethod is to study the excitation system and generator respectively, which is verymature,however but ignores the coupling. With the development and deepening ofcontrol theory, people begin to consider applying the advanced control theory to theresearch of integrated control of water turbine generator. The so-called integrated controlis to control the turbine and generator as a whole, making the generator terminal voltageand angular velocity as the feedback quantity to control the excitation regulator andspeed regulator in order to improve the stability of the control system.First, the paper introduces the working mechanism of the turbine and generator, themathematical model of speed control and excitation control individual and thecomprehensive control method. Have their linearization to solve the model nonlinearproblems.Then, introduces the basic concepts of optimal control. Optimal control theory andapplications were used to design speed control optimal controller, the optimal excitationcontroler and the integrated controller. By simulation contrast, verify that the integratedcontrol has better control effect.Finally, introduces the dyadic expansion algorithm. By choosing weighting functionto design robust control strategy based on dyadic expanded. The simulation study showsthat the dyadic expansion can solve the coupling problem of the system, and the robustcontroller designed in this paper has better anti-interference performance and moreexcellent control effect.