大规模海上风电经VSC-HVDC并网后电能质量问题分析  

Analysis on power quality problem of large-scale offshore wind power grid-connected via VSC-HVDC

作　　者：吕志超 苏建军 程艳 李广磊 韩世浩 赵志鹏 邵泰衡 王乐淼 LüZhichao;SU Jianjun;CHENG Yan;LI Guanglei;HAN Shihao;ZHAO Zhipeng;SHAO Taiheng;WANG Lemiao(College of Electrical Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Shandong Electric Power Research Institute,Jinan 250002,China)

机构地区：[1]山东理工大学电气工程学院,山东淄博255000 [2]国网山东省电力公司电力科学研究院,山东济南250002

出　　处：《现代电子技术》2020年第5期92-96,100,共6页Modern Electronics Technique

基　　金：国家科技支撑计划课题(2015BAA07B01)。

摘　　要：由于海上风速的多变性,同时风机组中存在大量电力电子器件等原因,其并网后所产生的电能质量问题不容忽视。对于离岸较远的大规模海上风电场,基于电压源换流器的高压直流输电(VSC-HVDC)凭借其独特的技术优势未来将成为不可或缺的输电技术。为保证电能质量符合标准,需在并网前对电能质量作出分析。根据风电场等值原理,运用PSACD/EMTDC仿真软件搭建由双馈异步风机组成的大规模海上风电场经VSC-HVDC并网模型,研究其在风速波动下闪变、谐波电压与电流、电压偏差等电能质量问题。结果表明,在风速波动时谐波问题比较严重,实际工程中应充分考虑当地风资源的状况,制定合理的滤波方案,为今后海上风电并网的电能质量分析工作提供借鉴与参考。The power quality problems caused by the grid-connection cannot be ignored because of the variability of offshore wind speed and the existence of a large number of power electronic devices in wind turbines.As for large-scale offshore wind farms far from the shore,voltage source converter based high voltage direct current(VSC-HVDC)will become an indispensable power transmission technology in the future due to its unique technical advantages.The power quality should be analyzed before grid-connection to ensure that the power quality meets the standards.The PSACD/EMTDC simulation software is used on the basis of equivalence principle of wind farms to build a model of large-scale offshore wind farm composed of DFIG connected to the grid via VSC-HVDC.The power quality problems such as flicker,harmonic voltage and current,and voltage deviation occurring as wind speed fluctuation are researched.The results show that the harmonic problem is serious when the wind speed fluctuates.In practical projects,the local wind resources should be fully considered and reasonable filtering schemes should be formulated.It provides a reference for the power quality analysis of the offshore wind power′s grid-connection in the future.

关 键 词：海上风电 VSC-HVDC 电能质量 并网模型 输电技术 滤波方案 

分 类 号：TN99-34[电子电信—信号与信息处理] TM614[电子电信—信息与通信工程]