摘要
为了提升双馈电机(DFIG)风电系统柔性故障穿越(FFRT)能力,提出了采用全钒液流电池(VRB)储能的三单相不间断动态电压恢复器(UDVR)应对策略。对电网电压不平衡时DFIG转子侧变换器和网侧变换器暂态特性进行了理论分析,对全钒液流电池充放电特性进行了仿真分析,对单相UDVR的工作原理、矢量关系及其控制策略进行了研究。建立了基于VRB储能的UDVR改进DFIG风电系统故障穿越能力仿真模型。采用正常运行时UDVR旁路备用,电网故障时UDVR进行电压补偿的方式,验证了DFIG-FFRT特性。结果表明:对于严重的电网对称和不对称故障情况,UDVR可向电网注入补偿电压,整个暂态过程机组向电网注入了友好型绿色能源,提升了DFIG机组无超调FFRT运行能力。
To meet the requirements of improving the flexible fault ride through （FFRT） capability of double fed induction generator （DFIG） wind power system, we proposed a novel strategy of adopting three-single-phase uninterrupted dynamic voltage restorer （UDVR） with vanadium redox flow battery （VRB） energy storage. The transient characteristics of rotor side converter and grid side converter of DFIG under unbalanced grid voltage are analyzed, the charge-discharge charac- teristics of VRB is simulated and analyzed, and the single-phase UDVR working principle, unbalanced voltage vector and control strategy of UDVR are discussed. Furthermore, the simulation model for improving FFRT capability of DFIG wind power system based on VRB energy storage is established. The operation characteristics of DFIG-FFRT is verified by adopting the method, in which UDVR is bypass standby during grid normal operation and compensates unbalanced vol- tage during grid fault. The results reveal that, in view of the severe symmetrical and asymmetrical grid fault conditions, UDVR can inject compensation voltage to the grid. The DFIG wind turbine, in which green power is injected to the grid in whole voltage transient process, can improve the operation capacity of DFIG-FFRT without overshoot.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第10期3185-3192,共8页
High Voltage Engineering
基金
国家自然科学基金(51567020
51367012)
教育部新世纪优秀人才支持计划(NCET-11-1018)
内蒙古自治区自然科学基金(2015MS0532
2011BS0903)
内蒙古自治区"草原英才"工程(CYYC2013031)
风能太阳能利用技术省部共建教育部重点实验室开放基金(201403)~~
关键词
全钒液流电池
不间断动态电压恢复器
PR控制
柔性故障穿越
风力发电
双馈电机
储能
vanadium redox flow battery
uninterrupted dynamic voltage restorer
proportional-resonant control
flexible fault ride-through
wind power generation
DFIG
energy storage system
