提升风电场MMC-HVDC系统LVRT能力的协调控制策略  

Coordinated Control Strategy to Enhance LVRT Capability of MMC-HVDC Systems Connected Wind Farms

作　　者：朱蒙 李卫星[1] 晁璞璞 徐殿国[1] 李语童 ZHU Meng;LI Weixing;CHAO Pupu;XU Dianguo;LI Yutong(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《电力系统自动化》2018年第19期77-82,共6页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2017YFB0902000);国家自然基金重点项目(51237002);国家电网公司科技项目(SGXJ0000KXJS1700841)~~

摘　　要：降压控制是实现风电场经基于模块化多电平换流器的高压直流(MMC-HVDC)输电并网系统低电压穿越(LVRT)的主要方法,但采用降压控制极易导致风电场暂态过流,不仅会加重风电机组的电气应力,还会危及直流系统的安全运行。为了改善风电场及MMC-HVDC系统的暂态特性和低电压穿越能力,文中对双馈感应发电机(DFIG)风电场MMC-HVDC系统的低电压穿越过程进行了解析,设计了与降压控制相协调的风电场辅助降载控制策略,分析了控制器参数变化对风电场降载速率及直流系统电压动态特性的影响,通过仿真验证了所设计方案的有效性。Voltage drop control is the main low voltage ride-through（LVRT）method for MMC-HVDC system connected wind farms,but it often causes wind farm overcurrent during transient state,which will not only increase the electric stress of wind turbine but also endanger the safe operation of MMC stations.In order to improve the transient characteristics and LVRT capabilities of the system,the LVRT process of MMC-HVDC systems connected DFIG-based wind farms is analyzed in detail,and an auxiliary power reduction control strategy is proposed for wind farms.The impacts of the controller parameters variations on power reduction rates and dynamic behaviors of DC voltage of MMC are also analyzed.Finally,case studies have conducted to verify the effectiveness of proposed schemes.

关 键 词：风电场 MMC-HVDC 低电压穿越 降压控制 降载控制 

分 类 号：TM614[电气工程—电力系统及自动化]