Study on improved droop control strategy of MMC-MTDC system based on novel sliding mode control

Zhang, Mingguang; Wang, Wenting; Ding, Jingjing

doi:10.1016/j.egyr.2021.09.138

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…To solve this problem, people have proposed an adaptive droop coefficient control strategy, which determines the droop coefficient based on the power function form of SOC changes and improves the power distribution effect to a certain extent. It is more suitable for suppressing bus voltage fluctuations and achieving SOC balance in the droop control link [21,22]. However, this control method has complex control structures and ignores the steady-state bus voltage deviation caused by traditional droop control defects.…”

Section: Pvmentioning

confidence: 99%

Automatic SOC Equalization Strategy of Energy Storage Units with DC Microgrid Bus Voltage Support

Tian,

Mo,

Zhao

et al. 2024

ENERGY

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In this paper, an improved sag control strategy based on automatic SOC equalization is proposed to solve the problems of slow SOC equalization and excessive bus voltage fluctuation amplitude and offset caused by load and PV power variations in a stand-alone DC microgrid. The strategy includes primary and secondary control. Among them, the primary control suppresses the DC microgrid voltage fluctuation through the I and II section control, and the secondary control aims to correct the P-U curve of the energy storage system and the PV system, thus reducing the steady-state bus voltage excursion. The simulation results demonstrate that the proposed control strategy effectively achieves SOC balancing and enhances the immunity of bus voltage. The proposed strategy improves the voltage fluctuation suppression ability by approximately 39.4% and 43.1% under the PV power and load power fluctuation conditions, respectively. Furthermore, the steady-state deviation of the bus voltage, U dc is only 0.01-0.1 V, ensuring stable operation of the DC microgrid in fluctuating power environments.

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Section: Pvmentioning

confidence: 99%