The H∞ control method of bidirectional converter in hybrid AC/DC microgrid

摘要

Hybrid AC/DC microgrid can make full use of different kinds of renewable energy to meet the needs of various types of loads. The bidirectional converters become the link between dc and ac region. In this paper, H8 robust control method is proposed to stabilize the both-side voltages of the bidirectional converters where it is transformed to a mix sensitivity problem. When there are perturbations on system parameters or disturbances in system operation, the system can maintain stability. The system order is reduced through Park transformation that converts the periodic three-phase timevarying signal to two-phase dc signal, therefore the design complexity of controller is simplified and the tracking accuracy of phase angle is improved. By using Matlab/Simulink, the anti-interference capability and good control capability are verified in the condition that the parameters of the converters change.