电网技术2016，Vol.40Issue(1)：47-54,8.DOI:10.13335/j.1000-3673.pst.2016.01.007
应用于海上风电场柔性直流接入系统的直流故障穿越协同控制策略
Coordinated DC Fault Ride-Through Control Strategy for Offshore Wind Farm Interconnection With Flexible HVDC
摘要
Abstract
More and more offshore wind farms are connected to main grid with flexible HVDC in recent years.However,Modular Multilevel Converter (MMC) based on traditional half-bridge sub-module cannot suppress DC fault current because of its topological limitation.When pole-to-pole DC fault occurs,general strategy such as blocking IGBTs or tripping AC breaker will cause wind farm shedding from system.To solve the problem,a coordinated control strategy was proposed based on hybrid sub-module MMC containing half-bridge sub-module and full-bridge sub-module.The strategy controls DC voltage to suppress fault current during pole-to-pole DC fault.In order to keep power flow balance,offshore wind farm power flow limits would change according to flexible HVDC's DC voltage.The proposed strategy could ride through DC fault without blocking IGBTs,while keeping capacitor voltage stable.Finally,feasibility and effectiveness of the proposed method were verified with MATLAB/SIMULINK simulation.关键词
海上风电场/柔性直流输电/协同控制/直流故障穿越Key words
offshore wind farm/flexible HVDC/coordinated control strategy/DC fault ride-through分类
信息技术与安全科学引用本文复制引用
李道洋,姚为正,吴金龙,王先为,张军,行登江..应用于海上风电场柔性直流接入系统的直流故障穿越协同控制策略[J].电网技术,2016,40(1):47-54,8.基金项目
国家863高技术基金项目(2015AA050101).The National High Technology Research and Development Program of China (863 Program) (2015AA050101). （2015AA050101）
