Maximum Power Tracking Via Outputregulation In Wind Energy System With PMSG

Wind power generation is very important for China’s energy transformation and the implementation of low-carbon economy strategy. Wind power generation system with permanent magnet synchronous generator( PMSG) has no gearbox, low maintenance cost, small volume, low voltage ride-through capability, becoming mainstream in medium-scale motors. In view of the characteristics with multi-variable, strong coupling and nonlinear, the output regulator with adaptive internal model is applied to improve the system performance and to increase the efficiency of power generation.The system model of PMSG wind power generation system is studied. The system controller is designed according to the traditional double-closed-loop voltage-vector control strategy. On the experimental platform of PMSG wind power generation, the traditional double closed loop voltage vector control strategy is verified by experiments. The stability of the system is tested under different wind speed conditions. The control strategy of maximum power point tracking(MPPT)is verified by the test.Based on the new viewpoint of the output regulation, the MPPT of the PMSG wind power generation system is formulated as a regulation problem of a new system. In view of the complexity of the PMSG wind power generation system, the system model is divided into the external system containing the tracking signal, the internal module with the adaptive controller and the original system equation. The wind speed signal is a series of Fourier functions with unknown characteristic frequency, which is converted into a speed tracking signal by the optimal power speed curve. According to the characteristics of the adaptive internal model system, the design method of the controller is studied. The internal model system is used to realize two targets: the stability of the internal model and the asymptotic approximation to the exosystem. In the new error coordinate system, the system of the error system including the adaptive parameters is established, and the controller design problem of the extended system is simplified to the establishment of the port-Hamiltonian model. The implementation of the regulator is proved by the theory of port-Hamiltonian.The simulation results show that the MPPT of PMSG wind power generation system can be realized by the control based on the output regulator under the random disturbance wind speed. Compared with the control performance of the classical PI control strategy, the output regulator controller has better robustness and fast convergence, and is more suitable for the nonlinear and multi disturbance PMSG wind power generation system.