Abstract
This paper presents a hierarchical control strategy (HCS) for modular multilevel converter (MMC)-based islanded microgrid which is composed of two parts: the inner MMC control (IMC) and the outer loop control (OLC). The former includes the voltage and current control loops and the circulating current suppression algorithm, which are used to stabilize the bridge arm voltage, balance the individual capacitor voltage and suppress the circulating current. The later includes the droop control, secondary control and voltage/current harmonic regulation control loops, which are used to obtain good power sharing, balance the main circuit voltage, restore the frequency deviations and suppress the output voltage harmonics. Then, the dynamic linear/nonlinear load perturbation and single-phase load transient disturbance are applied to test the effectiveness of the proposed control strategies. The simulation results obtained from Matlab/Simulink are presented to verify the strategy.
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