Improved Direct Power Control of a DFIG-Based Wind Turbine During Network Unbalance
Improved Direct Power Control of a DFIG-Based Wind Turbine During Network Unbalance
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DOI：
10.1109/tpel.2009.2032188
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发表时间：
2009-09
影响因子：
6.7
通讯作者：
Peng Zhou;Yikang He;Dan Sun
中科院分区：
文献类型：
--
作者：
Peng Zhou;Yikang He;Dan Sun
针对风力发电系统中双馈感应发电机（DFIG）和电网侧变流器（GSC）在不平衡网络条件下的控制问题，提出了一种改进的坐标直接功率控制（DPC）策略。分别针对DFIG和GSC提出了两种改进的DPC方案。DFIG的DPC是为了消除转矩和定子无功功率的脉动，GSC的DPC是为了补偿定子有功功率的脉动。为了提高整个系统的控制性能，在改进的DPC中采用基频调谐和双网频调谐的谐振控制器，消除电网暂态不平衡故障产生的转矩脉动和功率脉动，使DFIG和GSC的输出功率可以直接调节，而无需进行正负序分解。通过电网电压不平衡条件下2mw双馈系统的仿真，验证了所提DPC策略的有效性。
This paper proposes an improved coordinate direct power control (DPC) strategy for the doubly fed induction generator (DFIG) and the grid side converter (GSC) of a wind power generation system under unbalanced network conditions. Two improved DPC schemes for the DFIG and the GSC are presented, respectively. The DPC for DFIG is to eliminate the torque and stator reactive power pulsations, while the DPC for GSC is to compensate for the pulsations of stator active power. In order to provide enhanced control performance of the overall system, the resonant controllers tuned at the fundamental and double grid frequency are applied in the improved DPC to eliminate the torque and power pulsations produced by the transient unbalanced grid faults, so that the output power of DFIG and GSC can be directly regulated without any necessity of the positive and negative sequence decomposition. The effectiveness of the proposed DPC strategy is verified by the simulation results of a 2-MW DFIG system under unbalanced grid voltage conditions.