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EMI performance comparison of two-level and three-level inverters in small dc-link capacitors based motor drives
Maheshwari, RamKrishan; Munk-Nielsen, Stig; Busquets Monge, Sergio
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. GREP - Grup de Recerca en Electrònica de Potència
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.
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
Attribution-NonCommercial-NoDerivs 3.0 Spain

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