Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Simple Compensation Method of Unclamped Switch Voltages in a Three-Level NPC Inverter
Authors Kyun-Seon Ji ; Sung-Tak Jou ; Hae-Gwang Jeong ; Kyo-Beum Lee
DOI 10.6113/TKPE/2014.19.3.257
Page pp.257-265
ISSN 1229-2214
Keywords neutral point clamped (NPC); three-level inverter; clamping voltage; compensation method
Abstract This paper proposes a simple compensation method for switches of the unclamped voltage in the three-level NPC inverter. Voltages of inner-switches can be unclamped in the three-level NPC (neutral point clamped) inverter. It can cause the problem of the switch fault accident. By adding a capacitor, switches of the unclamped voltage can be clamped. Through the analysis of the circuit, the reason behind switches being unclamped was verified which leads to the solution method that designs a compensation capacitor. The proposed method was validated through the simulation and experimental results.