Title :
A new stacked NPC converter: 3L-topology and control
Author :
Floricau, Dan ; Gateau, Guillaume ; Dumitrescu, Mariana ; Teodorescu, Remus
Author_Institution :
Politehnica Univ. of Bucharest, Bucharest
Abstract :
In this paper a new three-level (3L) voltage source converter is presented. This new topology called Stacked Neutral Point Clamped (3L-SNPC) increases the apparent switching frequency compared with other 3L structures (3L-Stacked Cells, 3L-Neutral Point Clamped and 3L-Active NPC). This advantage leads to a better balancing of total losses in power switches under all specified operating conditions (low or high modulation index). The topology has more degrees of freedom and allows a parallel conversion. The load current passes simultaneously or alternatively through two parallel paths, depending on PWM strategy. In the paper three PWM strategies are proposed and their switching states and commutations are analyzed. The total losses in power switches are calculated and compared to the most popular 3L structures. Experimental and simulation results are illustrated in the paper to confirm the operation of the proposed topology.
Keywords :
network topology; power conversion; switches; 3L active NPC; 3L neutral point clamped; 3L stacked cells; NPC converter; load current passes; parallel conversion; power switches; stacked neutral point clamped; switching frequency; three level topology; voltage source converter; Capacitors; Pulse width modulation; Pulse width modulation inverters; Semiconductor devices; Sliding mode control; Switches; Switching converters; Switching frequency; Topology; Voltage; Modulation strategy; Multilevel converters; Pulse Width Modulation (PWM); Voltage Source Converter (VSC); Voltage Source Inverter (VSI);
Conference_Titel :
Power Electronics and Applications, 2007 European Conference on
Conference_Location :
Aalborg
Print_ISBN :
978-92-75815-10-8
Electronic_ISBN :
978-92-75815-10-8
DOI :
10.1109/EPE.2007.4417285
