基于反推算法的双馈感应风力发电机直接功率控制

为提高双馈感应风力发电机的控制性能,提出了一种基于反推算法的直接功率控制(BSDPC)策略。讨论了在平衡电网条件下BS-DPC的基本原理,以及不平衡电网条件对BS-DPC的影响,并提出了针对不平衡电网条件的BS-DPC新的控制目标和改进控制策略。在平衡电网条件下,对双馈感应风力发电机基于传统查询开关表的直接功率控制(LUT-DPC)、矢量控制(VC)和BSDPC进行了仿真和实验研究,结果证明,BS-DPC在继承了LUT-DPC优异动态性能的同时,可获得恒定开关频率,并减小电流谐波和功率波动,具有良好的稳态性能;不平衡电网条件的仿真和实验研究同样证明了改进BS-DPC策略的正确性和有效性。

Backstepping-based Direct Power Control of Doubly-fed Induction Wind Turbines

In order to improve the operating performance of doubly-fed induction wind turbines, this paper proposes a direct power control (DPC) based on backstepping algorithm (BS-DPC). Firstly, a brief introduction of backstepping control is presented and the basic principle of BS-DPC is discussed in detail, then the comparative research and analysis on simulation and experimental results of look-up table DPC (LUT-DPC), vector control (VC) and BS-DPC under balanced power grid situation are proposed. The BS-DPC not only inherits excellent dynamic performance from traditional DPC, but also has excellent steady performance and decreases harmonic current and power pulsation with constant switching frequency. Secondly, the influence of unbalanced power grid on the BS-DPC is discussed, and then new control objectives and an improved control strategy based on BS-DPC are proposed. Simulation and experimental results verify the effectiveness of improved BS-DPC under unbalanced power grid condition as well. This work is supported by National Natural Science Foundation of China (No. 51377141) and Zhejiang Provincial Natural Science Foundation of China (No. LY13E070001).