不平衡负载下DFIG的孤岛运行控制技术

Autonomous Operation Control Technique of DFIG Under Unbalanced Load

针对孤岛模式下双馈异步发电机(DFIG)实际运行需要,通过改进间接定子磁链定向(ISF0)控制策略,分离提取定子磁链正负序分量并使用比例积分谐振(PIR)控制,实现不平衡负载下DFIG定子输出电压幅值、频率稳定。实验表明该算法能明显降低DFIG定子输出电压不平衡度,从而有效满足DFIG孤岛不平衡条件下运行需求。

Aiming at the operation requirement of doubly-fed induction generator （DFIG） under autonomous operation mode, this paper presents the modified indirect stator flux orientation （ISFO） strategy to implement the stability of sta- tor voltage amplitude and frequency on the unbalanced load, in which both the positive and negative sequences of st- ator flux are extracted and controlled by the proportional integral resonant（PIR） controller.The experimental results indicate an evident decline of the stator voltage unbalanced degree, which strongly validates the proposed strategy.