Abstract
For low-voltage AC-DC hybrid microgrids, an improved distributed droop control is proposed. The control strategy can reduce the unnecessary and excessive power transmission of interlinking converters (ICs) and realize accurate power distribution. Different from the traditional droop control, the improved strategy will establish a new operation target according to the load of AC and DC subgrids. The power sharing concept of distributed generations (DGs) is applied to IC control, which enables flexible power interactions between AC and DC subgrids. The proposed control strategy only allows the leader IC to collect information from the AC and DC side in order to reduce the communication pressure of the system. For the rest of the follower ICs, they communicate with each other to ensure accurate power distribution. Finally, a small signal model is established to analyze the impact of communication delay on the system stability. The AC/DC hybrid microgrid model is built on Matlab/Simulink to validate the performance of the proposed control strategy.
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