TY - GEN
T1 - EMI performance comparison of two-level and three-level inverters in small dc-link capacitors based motor drives
AU - Maheshwari, Ram Krishan
AU - Munk-Nielsen, Stig
AU - Busquets-Monge, S.
PY - 2012
Y1 - 2012
N2 - The size of passive components in an adjustable speed drive can be reduced by using small dc-link capacitors. The EMI filter in the drive also consists of passive components. The size of the filter can be reduced by using a three-level inverter, which can have low output voltage distortion. However, the three-level inverter based on small dc-link capacitors requires a PWM strategy to maintain neutral-point voltage balance. In this paper, the common mode voltage, which is the determining factor for the EMI filter size, is analyzed for a virtual-vector-based PWM strategy. The common mode voltage, the shaft voltage, and the conducted emission for the small dc-link capacitor based three-level inverter are compared with that of the two-level inverter operated with space vector PWM strategy. Experimental results for the common mode voltage, the shaft voltage, and the conducted emission are presented. Results show that the conducted emission from the three-level inverter is lower than that of the two-level inverter. Thus, a three-level inverter requires a smaller EMI filter in motor drives with small dc-link capacitors.
AB - The size of passive components in an adjustable speed drive can be reduced by using small dc-link capacitors. The EMI filter in the drive also consists of passive components. The size of the filter can be reduced by using a three-level inverter, which can have low output voltage distortion. However, the three-level inverter based on small dc-link capacitors requires a PWM strategy to maintain neutral-point voltage balance. In this paper, the common mode voltage, which is the determining factor for the EMI filter size, is analyzed for a virtual-vector-based PWM strategy. The common mode voltage, the shaft voltage, and the conducted emission for the small dc-link capacitor based three-level inverter are compared with that of the two-level inverter operated with space vector PWM strategy. Experimental results for the common mode voltage, the shaft voltage, and the conducted emission are presented. Results show that the conducted emission from the three-level inverter is lower than that of the two-level inverter. Thus, a three-level inverter requires a smaller EMI filter in motor drives with small dc-link capacitors.
UR - http://www.scopus.com/inward/record.url?scp=84864843570&partnerID=8YFLogxK
U2 - 10.1109/ISIE.2012.6237166
DO - 10.1109/ISIE.2012.6237166
M3 - Article in proceeding
SN - 978-1-4673-0159-6
T3 - Industrial Electronics (ISIE), IEEE International Symposium on
SP - 652
EP - 657
BT - Proceeding of the IEEE International Symposium on Industrial Electronics ISIE 2012
PB - IEEE Press
T2 - 21st IEEE International Symposium on Industrial Electronics
Y2 - 28 May 2012 through 31 May 2012
ER -