双馈风力发电机功角暂态行为及其控制策略  

Transient performance of DFIG power angle in wind farm and its control strategy

作　　者：郝正航[1,2] 余贻鑫[1] 曾沅[1] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津300072 [2]贵州大学电气工程学院,贵州贵阳550003

出　　处：《电力自动化设备》2011年第2期79-83,共5页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217904)~~

摘　　要：为研究电网扰动下双馈风力发电机(DFIG)暂态行为和抵御电网扰动的技术措施,针对单机无穷大系统,定义了DFIG功角并分析其暂态行为。由于DFIG的功角与转子位置无关,其暂态行为是电磁暂态过程,故具有快变特点。在电网故障扰动下,DFIG的功角可能大幅变化,通过相量图分析发现功角大幅变化是导致机端电压严重跌落和转子过载的主要原因。提出了在暂态过程中,通过对备用坐标系和实时坐标系的切换操作,实现对DFIG的功角控制。所提策略无需测量远方变量,可使DFIG的功角剧变、电压跌落及转子过载问题得到较好解决。所提出DFIG功角控制策略还对风电场附近的同步电机有显著的致稳作用,能减小大扰动下同步电机的首摆幅度。单机无穷大系统算例和多机系统算例证实了所提方法的优越性。For studying the transient performance of DFIG（Doubly Fed Induction Generator） of under grid disturbance and developing the technical countermeasures,the power angle of DFIG is defined and its dynamic behavior is analyzed for a single-machine infinite system. As the power angle is independent of the rotor position and its transient behavior is an electromagnetic process,it varies quickly and greatly during grid disturbances. The analysis of vector chart demonstrates that the great variation of power angle causes the deep drop of terminal voltage and the overload of rotor. It is proposed to realize the real-time control of the power angle during the transient process by the switchover between the real-time frame and the standby reference frame to solve the problems mentioned above. The proposed angle control strategy can also restricts the first swing of the synchronous generators nearby the wind farm during grid disturbances. Simulations for single-machine infinite system and multi-machine system verify its superiority.

关 键 词：风力发电 双馈电机 暂态稳定 功角控制 备用坐标系 

分 类 号：TM614[电气工程—电力系统及自动化]