空間矢量PWM逆變器死區(qū)效應(yīng)分析與補償方法

針對電壓源型空間矢量脈寬調(diào)制逆變器的死區(qū)效應(yīng)，提出了一種根據(jù)電流矢量判斷電流極性的死區(qū)補償方法，分析了因死區(qū)時間、功率器件導(dǎo)通關(guān)斷時間引起的誤差電壓矢量，在不同的電壓矢量扇區(qū)內(nèi)根據(jù)電流極性的不同，通過矢量合成的方法得出了誤差電壓矢量的幅值，給出了該矢量和三相電流極性的對應(yīng)關(guān)系，并在靜止參考軸系內(nèi)完成了補償算法.結(jié)果表明，死區(qū)效應(yīng)引起了逆變器輸出電壓波形畸變，引起了電機電流波形畸變和轉(zhuǎn)矩脈動.該補償方法能有效改善電機導(dǎo)流波形，提高了逆變器的輸出性能.

Abstract: Aimed at dead time effect of voltage-fed space vector pulse width modulation (SVPWM) inverter,a novel compensation method detecting current polarities from the current vector was presented. Error voltage vector generated by the dead time，power devices turn-on and turn-off time was analyzed, and the amplitude of error voltage vector was calculated in different voltage vector sectors under different 3-phase current polarities. The relationship of error voltage vector and 3-phase current polarities was given，and the compensation algorithm was implemented in the stationary reference frame. The results indicate that
the dead time effect distorts inverter output voltage and current waveform and increases torque ripples of the motor. The compensation method can effectively improve motor current waveform, the inverter's output performance can be greatly enhanced.