【摘要】 针对兆瓦级双馈风力发电机转子励磁变频器的特点 ,本文首先将双PWM交 -直 -交变频器的主电路拓扑进行了等效 ,然后对等效后变频器的模型进行傅立叶分析 ,得出了系统的连续的高频数学模型。在此基础上 ,推导出了在一定的电流输入纹波系数的要求下 ,变频器输入电抗器参数的选择范围。进一步仿真的结果证明了本文所得出结论的正确性更多还原

【Abstract】 Aim to the MW-class doubly-fed wind generator’s rotor exciting convertor, the paper gives the equivalent circuit of the dual PWM ac/dc/ac convertor, and then applies Fourier analysis to the model of the equivalent circuit, obtains the continuous high-frequency math’s model. Based on it, the paper presents the range of the convertor’s inductor when the current’s harmonic coefficient is limited. The simulation’s result is given to prove the correctness of the conclusion.更多还原