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).