Study And Simulation On Fuzzy Frequency Controller Of Micro-hydro Power In Tibet

Micro-hydro turbine governing system is an important part of hydropower system, the quality of governing system deeply affect production efficiency and safety. Micro-hydro turbine governing system is a misalignment, time-variable, the non-minimum phase system, its dynamics characteristic internal uncertainty and the external environment perturbation polytropic and so on increased the control difficulty.Currently, in order to stabilize output voltage and frequency generators Micro-hydro usually electronic controller to control the size of the generator by loading in order to purpose. The controlling principle is to exceed the current electricity power by the loading conveyor to another "false load" and going, which is a constant load operation mode. The "false load" will cause power consumption, and make an energy waste when the unit running. In addition , the unit speed overshoot the scope and frequency fluctuations are larger when there is a larger boot and load disturbance , which also led to voltage instability and seriously affected the life of unit and electrical equipment and electrical safety.In the article first elaborated the fuzzy PID control rationale, introduced the PID controller's structure and the fuzzy control principle of fuzzy control. Then has analyzed of their characteristics, proposed a fuzzy-neural-based PID controller with combination of fuzzy and neural. Then has analyzed the Micro-hydro turbine governing system's composition, the structure and so on basic situation, introduced the Micro-hydro turbine governing system's principle of work and the work process, establish the Micro-hydro turbine governing system's mathematical model. Based on this, designed has been suitable for the Micro-hydro turbine governing system's fuzzy PID controller. Then carried on the simulation using MATLAB's SIMULINK tools, establish a simulation model based on the Micro-hydro turbine governing system's mathematical model, then simulated by SIMULINK and has carried on the multianalysis comparison to the simulation's results; The has analyzed the Micro-hydro turbine governing system's parameters (input the quantization factor and output the scale factor) by simulation, analysed of the parameters'impact to the dynamic quality of regulation.The simulation result indicated that the system has the good adjustment quality: has the adjustable time is short, has the strong noise-immune dynamic energy, the over-adjustment is small and the regulating process is quickly steady. Compares with the conventional PID control displays a stronger robustness, is one effective control method. To improve the Micro-hydro turbine governing system's performance to provide support theoretically.