Analysis and design of grid-connected 3-phase 3-level AT-NPC inverter for low-voltage applications

Authors : EMRE AVCI, MEHMET UÇAR

Pages : 2464-2478

View : 22 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The 3-level T-type neutral point clamped insert ignore into journalissuearticles values(T-NPC); inverter has become the most popular multilevel inverter used in low-voltage applications. However, the realization of a bidirectional switch located at the midpoint leg of the T-NPC inverter is achieved using two insulated gate bipolar transistors insert ignore into journalissuearticles values(IGBTs); with two antiparallel diodes. Power dissipation in these switches is high since there are two semiconductors insert ignore into journalissuearticles values(an IGBT and a diode); in the current path at the midpoint leg. Switch losses can be reduced and thus the highest conversion efficiency can be achieved if the bidirectional switches in the T-NPC inverter are replaced by highly efficient reverse-blocking IGBTs insert ignore into journalissuearticles values(RB-IGBTs);. The objective of this paper is to assess the performance of a 3-phase 3-level grid-connected advanced T-NPC insert ignore into journalissuearticles values(AT-NPC); inverter with RB-IGBT for low-voltage applications. This paper describes the operating principle of the grid-connected AT-NPC inverter, analyzes the power losses, and discusses the control strategy. A 1.7-kW laboratory prototype is designed and built to verify the feasibility and the effectiveness of the proposed 3-phase 3-level grid-connected AT-NPC inverter. Real-time control of the inverter is experimentally achieved using a dSPACE DS1103 controller. The experimental results show that the efficiency of the proposed grid-connected inverter is about 96.3%.
Keywords : RB IGBT, advanced T NPC, grid connected, highly efficient inverter, three level inverter, low voltage