Coordinated Control of DFIG's Rotor and Grid Side Converters During Network Unbalance
Coordinated Control of DFIG's Rotor and Grid Side Converters During Network Unbalance
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DOI：
10.1109/tpel.2008.921157
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发表时间：
2008-05
影响因子：
6.7
通讯作者：
Lie Xu
中科院分区：
文献类型：
--
作者：
Lie Xu
提出了一种双馈风力发电系统在电压不平衡条件下转子侧变流器和网侧变流器的协调控制方法。说明了不平衡电压下RSC和GSC的系统行为和操作。为了提供增强的操作，RSC被控制以消除在不平衡定子供电下的两倍供电频率下的转矩振荡。定子输出有功功率的振荡然后被GSC的有功功率输出抵消，以确保整个DFIG发电系统的恒定有功功率输出。为了提供RSC和GSC所需的正序和负序电流控制，分析了包含主控制器和辅助控制器的电流控制策略。主控制器在不涉及正/负序分解的正（dq）+帧中实现，而辅助控制器在提取负序电流的负序（dq）帧中实现。使用EMTDC/PSCAD的仿真结果为2 MW双馈风力发电系统，以验证所提出的控制方案，并显示增强系统运行期间的不平衡电压供应。
This paper proposes a coordinated control of the rotor side converters (RSCs) and grid side converters (GSCs) of doubly-fed induction generator (DFIG) based wind generation systems under unbalanced voltage conditions. System behaviors and operations of the RSC and GSC under unbalanced voltage are illustrated. To provide enhanced operation, the RSC is controlled to eliminate the torque oscillations at double supply frequency under unbalanced stator supply. The oscillation of the stator output active power is then cancelled by the active power output from the GSC, to ensure constant active power output from the overall DFIG generation system. To provide the required positive and negative sequence currents control for the RSC and GSC, a current control strategy containing a main controller and an auxiliary controller is analyzed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition whereas the auxiliary controller is implemented in the negative sequence (dq)- frame with negative sequence current extracted. Simulation results using EMTDC/PSCAD are presented for a 2 MW DFIG wind generation system to validate the proposed control scheme and to show the enhanced system operation during unbalanced voltage supply.