Phase current reconstruction strategy of PMSM based on improved zero pulse insertion method
Aiming at current sampling distortion caused by dead-zone of phase current reconstruction in DC bus single current sampling permanent magnet synchronous motor system,improved zero pulse inser-tion method(IZPIM)was proposed to realize phase current reconstruction.Firstly,the disadvantages of traditional fixed zero pulse insertion method(FZPIM)was analyzed:because the zero-pulse insertion time of each phase is the same,the advantage of"double-switch PWM"mode to suppress current ripple is not played.Secondly,the IZPIM reconstruction strategy was proposed to eliminate the reconstruction blind area by adjusting the zero-pulse time and extending the current sampling window through the PWM duty ratio of each phase.The spatial voltage vector synthesis relationship was analyzed to prove the accu-racy of the reference voltage vector synthesis when other sectors of effective voltage vectors appear in the IZPIM reconstruction dead-zone.Finally,based on the Devenin circuit method,a simplified circuit mod-el with different voltage vectors was proposed,the current grain amplitude of FZPIM and IZPIM was com-pared,and the experimental platform of permanent magnet synchronous motor was built for experimental verification.The results show that the current reconstruction error of IZPIM is less than 3%.Compared with the traditional method,the current ripple suppression effect reaches 50%,and the phase current distortion rate decreases from 12.72%to 6.87%.
single current sensorDC bus samplingphase current reconstructionreconstruction dead-zonepermanent magnet synchronous motorzero pulse insertion method
NETL
NSTL
万方数据
