电网不对称故障下双馈风力发电系统电压的检测

基于双矢量dq同步旋转变换，将基波电压正负序分量进行解耦，电网电压进行双αβ和双矢量dq同步旋转变换，旋转变换后得到的分量进行滞后T/4（ T为电压周期）调压控制，实现基波电压正序分量快速检测。仿真结果表明，所提出的电压检测方法可实现在电网不对称故障下能快速检测出电压跌落时刻和幅值，基波电压正序分量输出平滑，验证了所提出电压检测方法的有效性。

Voltage Detection of the Doubly-Fed Induction Generator Under Asymmetrical Grid Fault

In this paper, the decoupling detection of positive and negative sequence components of the fundamental voltage was achieved based on double vector dq synchronous rotation transformation. The grid voltage were transformed under the system ofαβand dq . The components obtained after rotation transformation were controlled by lag T/4 （ T is the voltage cycle） . The simulation results show that the proposed method can quickly detect the time and amplitude of voltage drop under the unsymmetrical grid fault. The output of positive sequence component of fundamental voltage is smooth, which verifies the proposed method of voltage detection.