Coordinated passivity control of permanent magnet synchronous generator based on dual PWM converter

Abstract

Passivity control of permanent magnet synchronous generator based on dual PWM converter can improve the system robustness. However, the DC bus voltage fluctuation still exists in the system because of the separated control for the generator-side converter and the grid-side converter. By introducing the grid-side dynamic power error into the passivity control, a novel coordinated passivity control scheme is proposed in this paper, in order to suppress the DC bus voltage fluctuation. The port controlled dissipative Hamiltonian system model of the permanent magnet synchronous generator system is established based on the dual PWM converter, furthermore, the original Hamiltonian energy function of the system is matched to the expected Hamiltonian energy function by the energy re-shaping. Moreover, the main factor of the DC bus voltage fluctuation is analyzed from the point of view of the expected Hamiltonian energy function. Compared with the traditional power feedforward control method, the system has no feedforward effect at the steady state, which proves the steady-state performance of the grid-side converter. The simulation results and the experimental results show that the proposed coordinated passivity control scheme can suppress the DC bus voltage fluctuation effectively.