采用串联网侧变换器的DFIG风电系统低电压穿越控制  

Low Voltage Ride-through Control of Doubly-fed Induction Generator Wind Turbines with a Series Grid-side Converter

作　　者：姚骏[1] 廖勇[1] 李辉[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆市400044

出　　处：《电力系统自动化》2010年第6期98-103,115,共7页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA05Z422);重庆市科技计划攻关项目(CSTC2008AB3047);输配电装备及系统安全与新技术国家重点实验室自主研究资助项目(2007DA10512709214)~~

摘　　要：双馈感应发电机(DFIG)因其对电网故障的敏感性,其低电压穿越运行控制技术备受关注。文中针对定子侧加装串联网侧变换器的新型DFIG风电系统,详细研究了其低电压穿越运行特性,提出了一种适用于新拓扑下发电系统的运行控制方案:通过控制串联网侧变换器抑制定子磁链暂态直流分量及电网电压负序分量对发电机转子侧的不良影响;通过控制转子侧变换器进一步限制故障时发电机的定、转子电流,从而实现发电系统的低电压穿越运行。仿真结果表明:采用所提出的控制方案,可实现电网故障时DFIG风电系统的零电压穿越运行;采用新拓扑的DFIG风电系统具有优良的电网对称及非对称短路故障穿越能力。Doubly-fed induction generator （DFIG） is sensitive to the grid faults, and its low voltage ride-through （LVRT） operation and control technology attracts more and more research interests. The LVRT operation characteristics of doubly-fed induction generator wind turbines with a series grid-side converter in the stator are investigated, and an operational control strategy is proposed. To restrain the stator and rotor currents during the grid fault, the series grid-side converter is controlled to suppress the transient DC flux component in the stator flux and the negative component in the grid voltage. In the mean time, a successful LVRT under the grid fault is realized by also controlling the rotor-side converter. Simulation results show that the proposed control strategy can make the DFIG system achieve zero voltage ride through, and the generation system with the new topology has the excellent fault ride-through capability under symmetrical and unsymmetrical faults.

关 键 词：风力发电 双馈感应发电机(DFIG) 电网故障 串联网侧变换器 低电压穿越 

分 类 号：TM614[电气工程—电力系统及自动化]