摘要
本文在SVPWM矢量控制策略下,只改变载波频率进行仿真,分析不同载波频率对谐波的影响。首先对SVPWM采样原理进行分析,建立载波频率与谐波关系的模型,然后对SVPWM矢量控制下的异步电机系统进行仿真,分析定子电流、转子转速和转矩波形,得出低谐波、响应速度快和转矩脉动小等特点,最后以A相定子电流为例,只改变载波频率分别取3 kHz、4 kHz和5 kHz进行FFT分析,对比三者的THD,可以得出载波频率越大,THD越小,谐波损耗越小。
The SVPWM vector control strategy,only with the carrier frequency changed,the influence of different carrier frequencies on harmonics are analyzed using simulation.Firstly,the sampling principle of SVPWM is presented.Then,the model of carrier frequency and harmonics relationship is established.And then,the asynchronous motor system under SVPWM vector control is simulated using Simulink,with the stator current,rotor speed and torque waveform analyzed,from which the characteristics of low harmonics,fast dynamic response and small torque ripple are observed.Finally,taking the A-phase stator current as an example,FFT analyses under the carrier frequency of 3 kHz,4 kHz and 5 kHz are conducted respectively,It can be concluded that the larger the carrier frequency,the smaller the THD,the smaller the harmonic loss.
作者
李纯清
Li Chunqing(Hunan Xiangdian Power Co.,Ltd.,Xiangtan City 411101,Hunan,China)
出处
《船电技术》
2021年第6期35-38,共4页
Marine Electric & Electronic Engineering
