The Nonlinear Equivalent Input Disturbance Coordinated Control for Enhancing the Stability of Hydraulic Generator System
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Hydraulic generator plays more important roles as a renewable clean energy in improving stability. As hydraulic generator enjoys strong nonlinear properties, traditional linearized control method may holds worse adaptability for vary disturbances. In order to solve the problem, a Nonlinear Equivalent Input Disturbance Coordinated Control (NEIDCC) method is proposed in this paper. The objective functions related to system control performance are firstly determined. Then the multi-objective equations satisfying the Brunovsky normal form are derived, by which the nonlinear control problem is transformed to linear space to be solved. The nonlinear equivalent control law is obtained from the linear law by calculating the Γ derivative of the objective functions. When the system is subjected to different disturbances, the designed NEIDCC control law supports dynamic damping by observing the disturbance to stabilize the oscillations. As a result, the control system holds good performance. The simulation results of the designed hydraulic turbine generator control system demonstrate the effectiveness of the NEIDCC method.
KeywordsHydraulic generator Stability NEIDCC Excitation
This work was supported by the National Natural Science Foundation of China (nos. 51267001) and the Natural Science Foundation of Shandong Province (nos. ZR2019YQ28).
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