Permanent Magnet Synchronous Generator (PMSG) and a PWM rectifier constitute a permanent magnet controllable power generation system,which has a increasingly wide application in the field of new energy power generation and electric drive.But compared with the direct grid connected operation generator,the stator current contains a large number of harmonic components.In this paper,the stator voltage harmonic model of permanent magnet synchronous generator under two modulation strategies of SPWM (sinusoidal pulse width modulation) and SVPWM (space vector pulse width modulation) was established.The harmonic current of generator stator current under different modulation ratio and carrier frequency was calculated and analyzed in detail,and change regulation of the harmonic current with the variation of modulation ratio and carrier frequency was also found.Finally,the simulation results verified the correctness of the conclusions.%永磁同步发电机(PMSG)与PWM整流器构成的永磁可控发电系统在新能源发电和电力驱动领域应用日益广泛,但与直接并网运行发电机相比,定子电流含有大量高次谐波分量.本文建立了SPWM(正弦脉宽调制)和SVPWM(空间矢量脉宽调制)两种调制策略下永磁发电机定子电压谐波模型,对不同调制比和载波频率下发电机定子电流谐波进行了详细的解析计算和分析,得到了谐波电流随调制比和载波频率的变化规律,仿真结果验证了结论的正确性.
展开▼
