A Coordinated Control Strategy for Microgrid Cluster Based on Interlinking Converter

Currently, the control design of hybrid AC/DC microgrids is usually based on the deviation of frequency and voltage measured by the interlinking converter for power balancing control, while the introduction of dynamic consensus control for the performance degradation of microgrids on both sides of the problem will likewise regulate the voltage, and at this time, after the elimination of voltage and frequency deviations, the power balancing control of the interlinking converter will lose its reliability. In order to achieve the accuracy of power interconnection, a hierarchical secondary control method for global power balancing and voltage-frequency of hybrid microgrids is proposed. Microgrids with different loading rates (actual power demand/maximum power supply capacity) on both sides are interconnected through an inter-microgrid interlinking converter, while metrics such as voltage recovery and reactive power equalization are recovered within the microgrid through consensus control. The proposed control strategy is simulated and experimented to verify the effectiveness of the control strategy proposed in this paper.