Small Fluctuation Stability Analysis In The Case Of Water Turbine Regulation System For Power Station With Complicated Conduit System

The water turbine regulation system is a complicate auto-controlling system, it's small fluctuation dynamic course means: when the water turbine regulation system is interfered by tiny disturbance of load or command signal, the change of different parameters in the system is less, we can thought they are subtle change near by the discussing conditions, so we can make each tache in the system linearization, that is, describe the dynamic specialty of each tache and the whole system by means of linear differential equation. Because the working performance of water turbine regulation system is direct related with safety operation of hydropower station and water turbine-generator unit as well as the electric-power quality generated. Therefore, it has important bearing that analysesing the small fluctuation dynamic course of water turbine regulation system.When the stability of water turbine regulation system is analysesed, at first, the mathematical model of the regulation system must be established; then the space matrix must be build by means of transfer matrix; third, this mathematical model must be simulated by computer; and at last, the differential equation must be solved by the method of R-K.In this paper according to the design scheme of Yao Heba Power Station in NanYahe River, the mathematical model with longer and complicated conduit system, elastic water hammer and PID regulating low of voter turbine adjusting system in the case of the small fluctuation has being built, which include conduit system, surge tank, draft tube, water turbine, generator and governor. The hydraulic losses are taken into account, and nonlinearization in water turbine and the governor is also taken into account. Then the source programme is established by use of the MATLAB soft with powerful function and the emulate calculation is carried out by computer, and after calculating with all sort of condition and parameter combination of water turbine regulation system of Yao Heba Power Station in Nan Yahe river, we can obtain the optimum parameter and adjustive range of the governor to assure the electrical system that the power station belongs the small fluctuation regulation stabilization.