电压不对称骤升下DFIG暂态特性及无功协调控制  

Transient Characteristics and Reactive Power Coordination Control of DFIG Under Asymmetric Voltage Swell

作　　者：林东敏 孙永彦 张小莉 钟海英 LIN Dongmin;SUN Yongyan;ZHANG Xiaoli;ZHONG Haiying(Economic Research Institute,State Grid Gansu Electric Power Company,Lanzhou 730050,Gansu,China)

机构地区：[1]国网甘肃省电力公司经济技术研究院,甘肃兰州730050

出　　处：《电气传动》2021年第4期34-39,共6页Electric Drive

摘　　要：针对双馈感应风力发电机(DFIG)电网电压不对称骤升故障,传统的研究大多集中于定子磁链暂态特性的分析,忽略了故障时间对DFIG的影响。以单相和两相不对称骤升故障为例,详细分析了DFIG在不同故障发生时刻的定子磁链暂态特性,并推导出对应的定子磁链和转子电压表达式。此外,DFIG一般运行在单位功率因数下,这忽略了其自身RSC和GSC的无功协调能力。针对这一问题,提出了DFIG无功协调控制方案,以此帮助风电系统实现穿越故障。仿真结果验证了暂态特性推导的正确性以及RSC和GSC无功协调控制方案的有效性,所提控制策略有效抑制了并网点电压的骤升,同时满足了系统无功支撑的需求。For the voltage asymmetry sudden rise fault of doubly fed induction generator(DFIG)grid,the traditional research mostly focuses on the analysis of stator flux transient characteristics,ignoring the impact of fault time on DFIG.Taking single-phase and two-phase asymmetric sudden rise faults as examples,the transient characteristics of stator flux linkage of DFIG at different fault time were analyzed in detail,and the corresponding expressions of stator flux and rotor voltage were deduced.In addition,DFIG is generally operated under the unit power factor,which the reactive power coordination abilities of its own rotor side converter(RSC)and grid side converter(GSC)are ignored.In order to solve this problem,a DFIG reactive power coordination control scheme was proposed to help wind power system achieve through fault.The simulation results verify the correctness of the derivation of transient characteristics and the effectiveness of RSC and GSC reactive power coordinated control schemes.The proposed control strategy effectively suppresses the voltage surge at the grid-connected point and meets the demand of reactive power support.

关 键 词：双馈感应风力发电机 高电压穿越 暂态特性 无功协调 

分 类 号：TM614[电气工程—电力系统及自动化]