Abstract
In order to reduce the use of power electronic devices, adapt to different loads connected to the DC microgrid, and improve the reliability and safety of power supply, this paper proposes a multi-voltage level DC microgrid control strategy. The basic structure and operation mode of multi-voltage level DC microgrid are introduced. The control strategies of photovoltaic power generation and hybrid energy storage are proposed. The model of bidirectional DC/DC converter is established and the control strategy of hierarchical control of DC bus voltage is proposed. A power balance control strategy is proposed for AC/DC bidirectional power converter to realize smooth AC-DC power transfer. Simulation analysis on Matlab platform verifies the feasibility of the control strategy.
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