双馈发电机应对电网低次谐波的直接谐振控制

Direct Resonant Control Scheme of Double Fed Induction Generator to Low-order Harmonics in Power Grid

为解决双馈发电机因电网低次谐波引起定子、转子电流和电磁转矩中含有谐波分量,导致双馈发电机输出电能质量降低和不能稳定运行的问题,提出了定子电流直接谐振控制方案。首先分析电网低次谐波对双馈发电机的影响;然后提出了基于谐振控制器的定子电流直接谐振控制方案;最后进行仿真研究。仿真研究表明,定子电流直接谐振控制方案可有效消除定子、转子电流和电磁转矩中的低次谐波分量,验证了控制方案的正确性和有效性,为工程实际应用提供参考。

The stator current direct resonance control scheme was proposed to solve the problem that tlie stator, rotor current and electromagnetic torcque of the doubly-fed generator were caused by the harmonics of the power grid,which leaded to the decrease of the output power quality of tiie doubly-fed generator and the non-stable operation. The influence of harmonics on doubly-fed generators was analyzed, and then the stator current direct resonance control scheme based on resonant controller was proposed. Finally,the simulation was carried out. The simulation results show that the stator current direct resonance control scheme can efectively eliminate the harmonic components in stator,rotor current and electromagnetic torque,and verify the correctness and effectivenss of the control scheme,and provide reference for practical application.