南方电网技术2026，Vol.20Issue(1)：57-67,11.DOI:10.13648/j.cnki.issn1674-0629.2026.01.006
基于超级电容储能型MMC的大规模风电直流送出系统故障穿越策略
Fault Ride-Through Strategy for Large-Scale Wind Power Transmission System Based on MMC-SESS
摘要
Abstract
To address the issue of DC voltage rise in large-scale wind power DC transmission systems based on modular multilevel converters(MMC)during AC voltage dips at the receiving end,a fault ride-through strategy utilizing supercapacitor energy storage MMC is proposed.The strategy involves utilizing the supercapacitor energy storage system to absorb surplus power during faults,thereby stabilizing the DC bus voltage,while optimizing the active and reactive current distribution of the receiving-end MMC to prioritize reactive power support for the AC grid.After the fault,the stored energy in the supercapacitor is released back into the grid,improving the utilization efficiency of wind power.Additionally,a parameter design method is presented for the supercapacitor energy storage system,including the filter inductance of the bidirectional Buck/Boost converter,the series and parallel numbers of supercapacitors,and the voltage reference value during steady-state operation.Simulation results in PSCAD/EMTDC demonstrate that the proposed strategy effectively suppresses overvoltage on the DC side and enhances the system's fault ride-through capability.In addition,the simulation results also verify that the proposed scheme has advantages in terms of DC voltage stability and energy utilization efficiency compared with the fault ride-through strategy based on DC unloading circuit.关键词
故障穿越/超级电容储能/无功功率补偿/柔性直流输电/卸荷电路Key words
fault ride-through/supercapacitor energy storage/reactive power compensation/voltage source converter based high voltage direct current/unloading circuit分类
信息技术与安全科学引用本文复制引用
苏浩天,王嘉骥,许建中,何棒棒,鲁翔,彭茂兰..基于超级电容储能型MMC的大规模风电直流送出系统故障穿越策略[J].南方电网技术,2026,20(1):57-67,11.基金项目
国家自然科学基金资助项目(52277094).Supported by the National Natural Science Foundation of China(52277094). （52277094）
