不平衡电压下双馈变速风电机组的控制策略

Control Strategy of the DFIG-Based Wind Power System under Unbalanced Grid Voltage Conditions

提出了不平衡电网电压下双馈发电机的控制策略,并建立了双馈发电机在正、反旋转坐标系下的数学模型。在此基础上推导和分析了电网电压不平衡条件下双馈发电机输出的瞬时有功、无功功率的组成。提出了4种可供选择的不平衡电压控制方案,并给出了不同控制目标下转子的正、负序电流目标值的计算原则。通过MATLAB/SIMULINK仿真验证了控制方案的有效性。

This paper proposes a new control strategy for doubly-fed induction generator （DFIG） under unbalanced grid voltage. In the stator voltage-oriented positive and negative reference frames, the mathematical model for DFIG under unbalanced grid voltage is developed. Based the proposed model, the stator output instantaneous active power and reactive power are deduced and analyzed. Four unbalanced control schemes are proposed and the corresponding rotor positive together with negative sequence currents. The presented control system is modeled on MATLAB/SIMULINK, and the simulation results are provided to demonstrate the feasibility of the proposed control scheme.