Study On Turbine Governing System Based On The Mode Of Regulating Water Level

In this paper, in order to solve the economic production of run-of-river hydropower plant, the new control mode of regulating the water-level of the forebay is introduced into the hydraulic turbine governor.Based on the establishment of the mathematical model of the water-level controlling system, the boundary control equation of the stable domain of the continuous system and discrete system are found respectively, and the characteristic of stable domain of the two systems is analysed. The results show that the water-level controlling system has wide stable domain and stable condition is easy satisfied and the domain is larger when the forebay time constant Tq is bigger. Then it probes the optimal pole-placement of hydraulic turbine governing system with the synthetical dominant pole-placement method based on the optimal state-adjuster and deduces the optimal relations of the parameters between the controlling objects and the regulating system. By the optimal experiment, the optimal function of the regulating parameters of the system under the interference of water level is deduced. At last, an emulation of a concrete instance proves that the dynamic performance of the governing system can primly meet the need of practical production by setting the-regulating parameters with reference of the optimal function.Besides, an improved PID algorithm is given in this paper. According to normal PID algorithm, the improved algorithm has higher calculation accuracy. After the analysis of the governing system under the mode of regulating frequency with different PID algorithm, it is easy to find that the system with improved algorithm has wider domain than that of the system with normal PID algorithm, and the former is more favorable to the stability than the later.