SVPWM调制策略下永磁同步发电机损耗分析

发布时间：2018-10-23 18:45

【摘要】：永磁同步发电系统中,发电机与PWM变流器直接相连,使永磁同步发电机谐波损耗增大,甚至会导致永磁材料不可逆去磁.针对该问题,本文利用AnSoft联合仿真研究了基于矢量控制的SVPWM调制策略下,设置不同调制比与载波频率对永磁同步发电机铜耗、铁耗及转子损耗的影响,并深入分析了损耗随调制比与载波频率变化的规律.仿真结果表明:SVPWM调制策略下的PMSG-PWM系统中,载波频率一定时,随着调制比的增大,永磁同步发电机铜耗、铁耗及转子损耗逐渐减小,且调制比每增加0.1对发电机铜耗的影响最大;调制比一定时,永磁同步发电机的铜耗、铁耗及转子损耗也逐渐减小,但载波频率每增加1kHz,对发电机铁耗及转子损耗的影响最大.研究结果为SVPWM调制策略下设定合理的调制比与载波频率以保障永磁同步发电机的安全运行提供了参考.
[Abstract]:In the PMSG system, the generator is directly connected to the PWM converter, which increases the harmonic loss of the PMSG and even leads to irreversible demagnetization of the permanent magnet material. Aiming at this problem, this paper studies the effects of different modulation ratio and carrier frequency on copper loss, iron loss and rotor loss of permanent magnet synchronous generator under SVPWM modulation strategy based on vector control by using AnSoft joint simulation. The variation of loss with modulation ratio and carrier frequency is analyzed. The simulation results show that the copper loss, iron loss and rotor loss of permanent magnet synchronous generator decrease with the increase of modulation ratio when the carrier frequency is constant in PMSG-PWM system with SVPWM modulation strategy, and the increase of modulation ratio has the greatest effect on the copper loss of generator. The copper loss, iron loss and rotor loss of PMSG are gradually reduced when the modulation ratio is constant, but with the increase of carrier frequency of 1kHz, the influence of the loss of PMSG on the loss of the generator and rotor is the greatest. The results provide a reference for the PMSG to ensure the safe operation of PMSG by setting a reasonable modulation ratio and carrier frequency under the SVPWM modulation strategy.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家自然科学基金资助项目(51407065) 湖南省科技计划项目(2015GK3012)~~
【分类号】：TM313

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