2026-04-13T15:17:39Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/191362026-01-16T08:15:53Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Maheshwari, RamKrishan author Munk-Nielsen, Stig author Busquets Monge, Sergio author 2012 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. Postprint (published version) Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència Electric filters -- Design and construction. Electromagnetic interference Electronic apparatus and appliances Adjustable speed drives Common mode voltage Conducted emissions Dc link capacitor EMI filters Low output voltage Motor drive Neutral-point voltages Passive components Performance comparison PWM strategy Shaft voltage Space vector PWM Three-level inverters Filtres elèctrics -- Projectes i construcció Interferència electromàgnetica Components electrònics EMI performance comparison of two-level and three-level inverters in small dc-link capacitors based motor drives