中文摘要：

为提高不平衡及谐波电网下双馈感应电机（doubly fed induction generator,DFIG）的运行性能,该文提出一种静止坐标系下的谐振滑模控制策略;通过在滑模控制切换面方程中加入6倍频谐振项,使系统实现对6倍频交流参考的无静差跟踪;实现了DFIG输出定子电流三相平衡且正弦,或者输出定子有功功率/无功功率平稳无脉动的控制目标,改善了不平衡及谐波电网下DFIG输出的电能质量。对比分析了不平衡及谐波电网下积分滑模控制与谐振滑模控制系统的性能,并证明了所提出控制系统的稳定性和收敛性。最后,构建了1 kW功率等级的DFIG实验平台,对所提控制策略进行了实验验证,证明了其可行性和有效性。

英文摘要：

In order to enhance the operation performance of doubly fed induction generator（DFIG） under the unbalance and harmonic grid voltages, this paper proposed resonant sliding mode control in the stator stationary αβ reference frame. The resonant controller tuned at the sixth fundamental frequency was added in the switching surface, which eliminated the tracking error at the sixth fundamental frequency. This control scheme achieved the control target of sinusoidal output currents or stable stator output active/reactive power, and improved the quality of DFIG output power under unbalance and harmonics grid voltage conditions. The analysis and contrast between the traditional integrate sliding mode control and the proposed resonant sliding mode control were given. And the stability and convergence capability of the proposed control strategy are analyzed. Finally, the experiments of the DFIG system validate the availability of the proposed control strategy.