Abstract:
AC/DC hybrid microgrid is able to supply AC load and DC load. In order to realize the uniform distribution of DC power among interlinking converters and improve the DC voltage quality, a hierarchical control strategy for the interlinking converters is introduced. The first layer of the control strategy is that the voltage - power droop control method is used, which can realize the uniform load distribution. Because the droop control may lead to fall of the DC bus voltage, the DC voltage reference value is compensated according to the second layer control method, which can recover the bus voltage and ensure the quality of the DC voltage. This control strategy is analyzed by the root locus method. The microgrid model is built based on the simulation software DIgSILENT, and simulation results verify the validity of the strategy.