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To address the issues of insufficient inertia and damping support caused by massive power electronic equipment devices connected to DC substations, and the large fluctuation or instability of the 220 V DC bus voltage caused by the variation of power on the load side, an enhanced inertial control strategy based on VDCM (EI-VDCM) for DC substation is proposed. Firstly, the structure of the PV and energy storage DC substation is described. Secondly, the correspondingly mathematical model of the EI-VDCM control is derived. Then, the auxiliary voltage regulation power link is introduced into the control system to suppress the fluctuation of DC bus voltage caused by power change. Finally, the simulation model is built to verify the control strategy, and the actual waveform results show that the EI-VDVM control strategy can improve the transient stability of the DC bus voltage.
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Zou et al. (2024) studied this question.
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