Abstract
The AC/DC hybrid microgrid can realize the power flow between the two sub-microgrids by controlling the interconnected converters connected to the AC and DC sub-microgrids, thereby improving the system’s ability to suppress power fluctuations. In order to achieve a reasonable power flow between the two sub-microgrids in the steady state and in the transient process, this paper analyzes that the traditional droop control of interconnected converter ( ILC ) pays less attention to the transient process of the hybrid microgrid. On the basis of virtual synchronous generator, a bidirectional virtual inertia control strategy for ILC is proposed. This control strategy can not only respond to the offset between the DC bus voltage and the AC frequency, but also achieve the goal of sharing the system power fluctuations between the two sub-microgrids in the steady state according to the voltage and frequency offset requirements. It can also respond to the DC bus voltage and The rate of change of the AC frequency realizes a reasonable inertial support between the two sub-microgrids in the transient process. In order to balance the transient target and steady-state target of the interconnected converter, this paper designs the parameters of the proposed control. Finally, a simulation model was built in PSCAD to verify the effectiveness of the proposed control strategy.
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