Abstract
In this paper, a nonlinear model is established for the Kaplan turbine generator set (KTGS) with dual input governor and generator excitation to solve unsatisfactory regulation performance caused by the deviation from the combination curve during the transient process. According to the model characteristics, the constraint effect of the objective function in multi-objective feedback nonlinear control design is utilized to replace the associative relationship between the wicket gate and the blade. Then, a three-variable integrated nonlinear control strategy (TVINCS) is applied to the wicket gate, blade governor, and generator excitation. Simulation results demonstrate the precise tracking performance of hydraulic and electrical parameters controlled by TVINCS. The controller is designed to guarantee the turbine's output efficiency, and effectively coordinate the wicket gate and blade actions in the dynamic regulation process, providing a superior dynamic adjustment performance for the system under various disturbances.
Highlights
Hydropower plant (HPP), a system with high hydroelectric coupling features and strong nonlinearity, is composed of the diversion system, hydro turbine, generator, and the connected power grid
Few integrated control laws have been developed for governor and excitation [9], [10], and few works have been devoted to the coordinate control of Kaplan turbine generator set (KTGS) [11]
The Kaplan turbine governor generally adopts the combination curve to achieve the control between the wicket gate and the blade, which means that the blade angle is adjusted based on the gate opening, so it is still a single input control system
Summary
Hydropower plant (HPP) , a system with high hydroelectric coupling features and strong nonlinearity, is composed of the diversion system, hydro turbine, generator, and the connected power grid. The combined control simplifies the governor structure and facilitates the control law design for the transient response process, the system runs in the region deviating from the combination curve At this time, the combined relationship can not improve the operating efficiency of the turbine and possibly further deteriorate the regulating quality of KTGS in the dynamic process [12]. The innovation of this paper is to employ the multi-objective feedback nonlinear control design method to constrain the governor-related objective quantities This method is utilized to adjust the wicket gate and the blade according to the best efficiency relationship with no need for the combined relationship.
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