连接直驱式风电场的MMC-HVDC低压协调运行控制  

Coordinated operation control on low DC voltage of MMC-HVDC integrating direct-drive wind farm

作　　者：张清枝[1] 赵成功[2] Zhang Qingzhi;Zhao Chenggong(College of Mechanical and Electrical Engineering,Xinxiang University,Xinxiang 453003,Henan,China.;XJ Electric Company Limited,Xuchang 461000,Henan,China)

机构地区：[1]新乡学院,河南新乡453003 [2]许继集团有限公司,河南许昌461000

出　　处：《电测与仪表》2018年第18期109-114,共6页Electrical Measurement & Instrumentation

基　　金：2016年度河南省高等学校重点科研项目(16A470013);2018年河南省科技攻关项目(182102210121)

摘　　要：近几年随着柔性直流输电技术的兴起,风力发电采用MMC并网被广泛地研究和应用,然而常规的风电柔直并网方案控制维度少,无法匹配负荷的灵活性。文中提出了一种永磁直驱式风电场连接全桥型子模块的风电并网系统,其具有交直流电流独立控制特点,可以在低直流电压下实现系统的稳定运行,有效避免了负荷减少时引起的风机脱网事故。在直流电压下降时,该系统能够维持并网点交流电压恒定,从而使风电场能够正常运行。最后在PSCAD/EMTDC中进行了仿真验证,结果表明了所提出系统及其控制策略的正确性。In recent years,with the rise of HVDC transmission technology,wind power using MMC and network is widely studied and applied.However,the conventional HVDC integrating wind power methods have less control dimension,so that can not match the flexibility of the load.In this paper,a permanent magnet direct-drive wind farm connected to the MMC with full-bridge sub-modules in the wind power integration system is presented,which has the characteristics of AC and DC current independent control.The system can be stably operated at low DC voltage to avoid the accident of the turbine cut off the net caused by load reduction.When the DC voltage drops,the system constantly maintains the AC voltage,so that the wind farm can run normally.Finally,the simulation is carried out in PSCAD/EMTDC.The results show the correctness of the proposed system and its control strategy.

关 键 词：模块化多电平换流器 直驱式风机 低直流电压 协调运行 

分 类 号：TM933[电气工程—电力电子与电力传动]