CAJ | 학술논문

对于海上风电场模块化多电平换流器型高压直流输电(MMC-HVDC)并网系统，提出风电场侧模块化多电平换流器通过双维度单环直接控制风电场集电系统交流电压的方法，有效控制集电系统交流电压并保持稳定。基于 PSCAD/EMTDC 建立整个海上风电场直流并网系统模型，进行相应仿真研究，针对风速变化、风电场集电系统故障、电网故障以及MMC-H VDC直流单极接地故障等几种情况进行暂态分析，并与交流并网系统暂态结果进行比较。研究结果表明，采用所述控制方法的并网MMC-H VDC系统在发生相应故障时能够保持稳定运行，验证了海上风电场MMC-H VDC并网系统及相应控制方法的正确性和有效性。
대우해상풍전장모괴화다전평환류기형고압직류수전(MMC-HVDC)병망계통，제출풍전장측모괴화다전평환류기통과쌍유도단배직접공제풍전장집전계통교류전압적방법，유효공제집전계통교류전압병보지은정。기우 PSCAD/EMTDC 건립정개해상풍전장직류병망계통모형，진행상응방진연구，침대풍속변화、풍전장집전계통고장、전망고장이급MMC-H VDC직류단겁접지고장등궤충정황진행잠태분석，병여교류병망계통잠태결과진행비교。연구결과표명，채용소술공제방법적병망MMC-H VDC계통재발생상응고장시능구보지은정운행，험증료해상풍전장MMC-H VDC병망계통급상응공제방법적정학성화유효성。
For offshore wind farm integration system with modular multilevel converter high voltage direct current (MMC-HVDC),the control strategy for the wind farm modular multilevel converter(MMC)to maintain the AC voltage of the wind farm collecting system is presented,which adopts single loop in two dimensions.The detailed offshore wind farm MMC-HVDC integration system is established.The model is realized with PSCAD/EMTDC.Simulation and research under different conditions are carried out.Transient behaviors of the whole integration system during wind speed variations,wind farm collecting system fault,grid fault and single pole grounding fault of the MMC-HVDC system are studied.The results are compared with the results of a high voltage alternating current(HVAC)integration system.The study reveals that the MMC-HVDC system with the control strategies presented can keep stable operation under different faults.The results show that the proposed grid integration system and control strategies are correct and valid.