Integrated Control Strategy of DC Bus Voltage with Adaptive Virtual Capacitor Control
Due to the widespread use of traditional droop control in DC microgrids,the system suffers from rapid DC bus voltage changes,oscillations and large excursions during constant power load disturbances,which is detrimental to the proper operation of voltage-sensitive loads.To solve the above problems,the paper proposes an integrated control strategy for the DC bus voltage,consisting of the improved adaptive virtual capacitor control(IAVCC),oscillation suppressor and voltage compensator.In particular,IAVCC adaptively adjusts the virtual capacitor according to the bus voltage change rate during load disturbance,enhancing system inertia of DC microgrid to slow bus voltage changes and improve system dynamic characteristics.On this basis,the oscillation sup-pressor significantly damps out the voltage oscillation by filtering out the high-frequency oscillation component of the bus voltage.In addition,the voltage compensator enables deviation-free regulation of the bus voltage,solving the problem of severe bus voltage dips when the load power increases.The proposed integrated control strategy achieves optimization of the dynamic characteristics of the DC bus voltage,oscillation suppression,and deviation-free regulation.Finally,the feasibility of the proposed strategy is proven by RT-LAB-based experiments.
DC microgriddroop controlvirtual capacitoroscillation suppressionvoltage compensation
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