Impact of Line Current Harmonics on the DC Bus Quality of a Three-Phase PWM Inverter

Journal article, 2014

Three-Phase PWM inverters are widely used in many applications. The dc bus of a three-phase PWM inverter is subject of harmonics due to the inherent PWM switching operation that may impose severe consequences to the system. The impact of 5th and 7th harmonic components on the dc bus ripple is investigated in this paper. The analytical formulation and simulation method have been used to quantify the impact of these harmonics on the dc bus quality. The results show that there is a low frequency component with an order of 6 (6th harmonic) on the inverter dc side current which is explained and discussed here.