一种基于电压矢量定向的新型DFIG磁链阻尼控制策略

Proceedings of The 7th International Power Electronics and Motion Control Conference Pub Date : 2012-06-02 DOI:10.1109/IPEMC.2012.6259181

Hongbin Ma, Xueguang Zhang, Xinlong Liu, Dianguo Xu

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引用次数: 7

摘要

提出了一种基于电网电压定向的新型DFIG磁链阻尼控制策略。由于电网故障引起的电压变化，DFIG定子中会产生暂态直流磁通分量，使输出功率波动，电磁转矩产生振动。在严重的情况下，发电机转子会产生过电压和电流。因此有必要采用磁链阻尼控制策略来消除定子中的直流磁链分量。首先基于DFIG模型分析了电网故障对电磁关系的影响。分析了DFIG电网电压矢量定向控制策略的稳定性。详细介绍了磁链阻尼控制策略的原理。考虑了转子侧变流器速率和发电机运行状态的影响。最后，通过仿真结果验证了所提控制策略的有效性。该方法可以快速消除暂态直流磁通分量，提高控制系统的稳定性，有助于实现DFIG系统的LVRT(低压穿越)运行。

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A novel flux damping control strategy of DFIG based on voltage vector oriented

A novel flux damping control strategy of DFIG based on grid voltage oriented is proposed in this paper. The transient DC flux component will emerge in DFIG stator because of the voltage changed by grid fault, which makes the output power fluctuate and the electromagnetic torque vibrate. In serious conditions, over voltage and current will be induced in the generator rotor. So it is necessary to adopt the flux damping control strategy to eliminate the DC flux component in stator. Firstly the influence on electromagnetic relationship caused by grid fault is analyzed based on the DFIG model. The stability of DFIG grid voltage vector oriented control strategy is also analyzed. The principle of the proposed flux damping control strategy is introduced in details. The effects of the rotor side converter's rate and the generator operation state are considered. Finally, the availability of proposed control strategy is verified by simulation results. The transient DC flux component can be eliminated quickly and the stability of control system is improved, so this method is helpful to achieve the LVRT (low voltage ride through) operation of DFIG system.

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Proceedings of The 7th International Power Electronics and Motion Control Conference

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