电力工程技术2025，Vol.44Issue(5)：57-68,12.DOI:10.12158/j.2096-3203.2025.05.005
海上风电经柔性低频输电送出系统的故障穿越协调控制策略
Fault ride-through coordinated control strategy for offshore wind power via flexible low-frequency transmission system
摘要
Abstract
The offshore wind power via flexible low-frequency transmission(FLFT)system based on the modular multilevel matrix converter(M3C)faces power surplus and stability risks following faults on the power frequency grid side.To address this issue,the effects of the M3C power frequency,low-frequency decoupling control strategy on the transient process under grid side faults are first analyzed in the paper.Secondly,boundary conditions for power frequency,low-frequency side voltage and active power are deduced.Consideration into the control methods of the M3C converter,low voltage ride-through requirements,and fault types,a fault ride-through strategy based on an improved voltage-dropping method is proposed for M3C-wind turbine joint voltage-power sag control to enable wind turbine overspeed load shedding outside the low voltage ride-through range.Finally,a wind turbine via a FLFT model is built in PSCAD/EMTDC to validate the proposed strategy.It is shown that the proposed strategy can ensure the average voltage of the M3C sub-module capacitors within limits and enable safe operation during system faults.关键词
海上风电/柔性低频输电(FLFT)/模块化多电平矩阵换流器(M3C)/降压法/超速减载/故障穿越Key words
offshore wind power/flexible low-frequency transmission(FLFT)/modular multilevel matrix converter(M3C)/voltage-dropping method/overspeed load shedding/fault ride-through分类
信息技术与安全科学引用本文复制引用
向念文,程海龙,叶寿洪,邵冰冰,王书来,陆翌..海上风电经柔性低频输电送出系统的故障穿越协调控制策略[J].电力工程技术,2025,44(5):57-68,12.基金项目
国家重点研发计划资助项目(2021YFB2401100) （2021YFB2401100）
国家电网有限公司总部科技项目(5211DS22002C) （5211DS22002C）
中央高校基本科研业务费专项资金资助项目(JZ2024HGTB0230) （JZ2024HGTB0230）
