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To address the issue of possible overvoltage in the DC transmission system beyond the allowable range for safe operation after a significant disturbance occurs, a self-adaptive voltage droop control strategy is proposed to enhance the voltage regulation capability of the system, which adopts conventional fixed coefficient droop control.Firstly, considering model accuracy, the Thevenin equivalent model of the modular multilevel converter is established.Then, based on the power-voltage characteristic relationship of conventional droop control and by incorporating the local electrical quantities of the converter station using droop control, a novel adaptive voltage droop controller is designed. Compared to traditional droop control strategies, the proposed adaptive voltage droop controller exhibits superior DC voltage regulation capability. Finally, a ±200 kV four-terminal flexible DC transmission system simulation model is built in the electromagnetic transient simulation software PSCAD/EMTDC to validate the effectiveness of the proposed adaptive voltage droop control strategy. Simulation results demonstrate that the voltage control performance of the proposed adaptive voltage droop control strategy is superior to that of the traditional droop control strategy.
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Basic Information:
DOI：10.12194/j.ntu.20221207005
China Classification Code:TM721.1;TM46
Citation Information:
[1]SUN Ji,QIU Jianlong,LIU Xueqiang ,et al.Adaptive voltage droop control for multi-terminal HVDC systems based on MMC[J].Journal of Nantong University (Natural Science Edition),2023,22(03):45-55.DOI:10.12194/j.ntu.20221207005.
Fund Information:
国家自然科学基金面上项目（62173175,61877033）
2023-04-10
2023-04-10
2023-04-10