| In recent years, Highlighted the limitation of thermal power and advantage of our country is rich in water resources, the government invested enormous of hydropower construction, makes hydropower station get leap development. However, with the boom of the national economy, the increase of electricity demand, power generation process eccn load constantly change at any time, make the hydro turbine speed is not easy to remain stable, the same unit output frequency volatility is bigger, cannot satisfy the needs of each department. In order to satisfy the hydropower grid transmission frequency index requirements, must be real-time adjust the water input of hydroelectric generating set, to adjust the speed of the unit. Hydro turbine governing system, therefore, as an important part of hydropower unit control system, its advantages and disadvantages of dynamic regulation performance is directly related to social production efficiency and security of person.Hydro turbine speed governor for hydro turbine grid electricity an essential control part of the production system, it through the actuator real-time adjustment of turbine guide vane opening, adjusting the energy input size, keeping the speed of hydropower unit in a certain range, maintain the stability of the unit output frequency in the end. Therefore, the turbine guide vane opening control for improving power system transient stability, improve the dynamic quality has an important role.In this paper, the hydraulic generator speed control system of synergetic control law was studied, and according to the synergetic control theory design of speed controller. Firstly, according to the working mechanism of hydro turbine governing system, adopts the modular modeling design method of the water turbine governing system is divided into several functional modules, and according to the signal link relations between modules, to establish the mathematical model of hydro turbine governing system, and the first-order generator and load model is given. Secondly, this paper discusses the source and basic principle of the synergetic control theory, the methods and steps of synergetic controller design is given. At the same time, to study the effect of design parameters on the controller utility, the synergetic controller design parameters for the mathematical analysis. Again, due to the hydropower stations are far away from load center, here in a single-machine infinite-bus system as the research object. In terms of the theory of synergetic control, select speed deviation and its acceleration linear combination of the two into a macro variables, define system manifold, in order to obtain good turbine speed regulation performance, speed control law of synergetic controller is deduced. Through the MATLAB/Simulink shows that the speed synergetic controller has strong robustness. Finally, for the study of synergetic control for the advantages of conventional PID control, the introduction of particle swarm algorithm(PSO) to the controller parameter optimization, and through MATLAB simulation analysis shows that synergetic controller has reduce the steady-state error, fast response speed and better dynamic performance.To sum up, application of synergetic control theory design of speed governor can obtain good speed control effect. Hydro-generator units synergetic control method is used for the speed control system has good dynamic regulation performance of generating unit. At the same time the speed controller together also has the advantages of structure design is simple and easy to implement. Therefore, the law of coordinated control method was applied to speed regulation control has better practical value and application prospect. |
PDF Full Text Request