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Coordinated Control for Power Balance Based on Per-Unit Voltage for Multivoltage-Level DC Microgrid

Multivoltage-level DC microgrid (MLDG) is composed of several DC submicrogrids (SMGs) with different voltage levels. In order to avoid power surplus or deficit of a DC SMG caused by the change of renewable sources and loads and lack of power control among SMGs, it is vital to realize the coordination among DC SMGs. In this paper, a coordinated control method based on per-unit voltage for power balance in MLDG is proposed. In this method, the compensation value is calculated by per-unit bus voltages at secondary control level, and sent to the dual active bridge (DAB) converter control loop which connects different DC SMGs. Thus, the per-unit bus voltages of each SMG can be controlled to be equal, which contributes to the global power balance. Finally, the validity and effectiveness of proposed control method are verified in Matlab/Simulink.