高电压技术2026，Vol.52Issue(3)：1060-1069,中插3,11.DOI:10.13336/j.1003-6520.hve.20242038
集成S7桥臂的基频调制电流源型海上换流站及其控制策略
Integrated Fundamental Frequency Modulation Current-source-converter Offshore Station with S7 Bridge Arm and the Control Strategy
摘要
Abstract
The use of IGCT-based current source converters(CSC)as the transmission solution for offshore wind farms can significantly reduce the construction costs of offshore converter stations compared to traditional solutions,making it a more economical choice.However,the existing modulation methods for CSCs use either pulse width modulation(PWM)or fundamental frequency modulation.The former suffers from high switching losses,while the latter,due to having only one control parameter(namely,the triggering angle),cannot achieve flexible control of active and reactive power.To ad-dress these issues,this paper proposes a current-source converter station with integrated S7 bridge arms and its control strategy.First,the S7CSC DC transmission topology is introduced,and its operating model is analyzed in detail.The co-ordination between the switching control of the S7 bridge arms and the fundamental frequency modulation strategy is discussed,and a mathematical model is developed.An offshore AC voltage/frequency control strategy is then proposed.The fault characteristics of offshore AC faults are analyzed,and a low-voltage ride-through strategy under AC faults is in-troduced.Finally,a PSCAD simulation model of the S7CSC is built to simulate and analyze the system structure and control strategy.The results verify that the S7CSC has two degrees of freedom,can stably control the offshore AC voltage,and demonstrates good fault response characteristics,making it capable of adapting to fluctuations in wind power output.关键词
远海风电/直流输电/S7CSC/调制原理/海上交流电压控制/低压穿越策略Key words
offshore wind power/HVDC/S7CSC/modulation principle/offshore AC voltage control/low-voltage ride-through strategy引用本文复制引用
冯定腾,熊小玲,王胜威,赵成勇..集成S7桥臂的基频调制电流源型海上换流站及其控制策略[J].高电压技术,2026,52(3):1060-1069,中插3,11.基金项目
国家自然科学基金联合基金(U23B20119). Project supported by Joint Funds of National Natural Science Foundation of China(U23B20119). （U23B20119）
