A common mode voltage reduction in boost rectifier/inverter systemby shifting active voltage vector in a control period

摘要

This paper proposes a new space-vector pulse width modulationn(SVPWM) strategy that can reduce the number of common mode voltagenpulses in a three-phase boost rectifier/inverter system using ansynchronized switching sequence. In the proposed SVPWM strategy, it isnpossible to eliminate one common mode voltage pulse in every controlnperiod by shifting the active voltage vectors of the inverter to alignnto those of the boost rectifier. Thus, a reduction in the total numbernof common mode voltage pulses and RMS motor leakage current can benobtained without extra hardware. Since the proposed SVPWM strategy cannbe simply implemented in software, it is widely applicable regardless ofnthe power capacity of the converter and results in no increment ofnconverter volume, weight and price. Moreover, because the proposed SVPWMnstrategy maintains the magnitude of the active voltage vector requirednfor motor control and simply changes the distribution of the zero,nvoltage vector, it does not effect the control performance of the powernconverter