Hydro Turbine Governor System Model And Its Control Method Research

Hydraulic power is the important power supply sourse in our country, it plays very important roles in power system such as frequency modulating, keeping the power system voltage in stable state and counterpoising the power system load in balance state.The hydraulic power system is a large complicated nonlinear system that includes hydraulic subsystem, hydro turbine generator unit subsystem, speed control subsystem, excitation control subsystem, among which, the performance of hydro turbine governor subsystem is one of important factors. So it has very important realistic significance that the hydro turbine governor system is particularly researched for improving the quqlity of power system frequency and stability.Tightly focusing on hydro turbine governor system, aiming at the output performance of hydro turbine governor system, according to different hydraulic structure of practical hydraulic power generator system, this paper has made deep research on several aspects of hydro turbine governor system model and its control strategy from the point of model category, modeling method and control strategy.The whole thesis consists of5chapters, each chapter of main contents can be summarized as follows:Chapter1introduction:A brief review has been given for current research status of the domestic and international hydro turbine governor system model and its control stategy theory. The necessity and fundamentality were discussed in this paper for carrying on the research of hydro turbine governor system model and its control strategy. The paper's main contents were put forward based on different hydraulic structure of practical hydraulic power generator system.Chapter2hydro turbine governor system model analysis:according to different hydraulic structure of practical hydraulic power generator system, combining with continuity equation and energy conservation equation of hydraulic thesis, detailedly considering the effect given by hydraulic transient flow, the hydro turbine governor system models of individual penstock(no surge), tunnel-surge-penstock-generator unit(with surge), common tunnel-individual penstock-generator unit (same tunnel multi-unit) were put forward systematically. Then the model characteristic was analysed by the method of time domain analysis and frequency domain analysis.Chapter3Individual penstock hydro turbine governor system control strategy: According to the different transient flow characteristic, the individual penstock hydro turbine governor system was classified as unelastic and elastic model. For unelastic model, the Nichols PID hydro turbine governor system control framework was established by appling the Nichols PID controller design method. The simple PID control parameters tunning rule was deducted. For elastic model, considering the excellent anti-interference and anti-parameter error ability of advanced robust control, the double loop H?robust control scheme was proposed for elastic model. By use of the method, the system control performance was improved from the simulation results.Chapter4Hydro turbine governor system control strategy with surge:For tunnel-surge-penstock-generator unit(with surge) hydro turbine governor system, the5order nonlinear model was set up For the first time, the hydro turbine governor control system was designed by use of multi-index nonlinear control design method, all the model state variables could be controlled. The simulation results demonstrate that the method can effectively improve the system stabilities. According to multi-disturbance features of unelastic hydro turbine governor system, by use of H?, robust control theory, a double-circuit robust control strategy for hydro turbine speed control system is proposed. The parameter and power system load disturbance simulation result demonstrate that H?robust control design method has excellent control performance for hydro turbine governor system with surge.The5th chapter summarizes the main work of full text and achievements of the dissertation. Finally, the future research contents have been put forward.