An analysis of midpoint balance for the neutral-point-clamped three-level VSI

Author

Dong Ho Lee ; Lee, Seong R. ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

1

fYear

1998

fDate

17-22 May 1998

Firstpage

193

Abstract

The three level voltage source inverter (VSI) is a good topology for high voltage and high power applications where no semiconductor devices are available. However, it has an inherent problem of midpoint charge balance. The problem becomes critical when the load is nonlinear and/or has large phase angle and harmonics. If it exceeds the critical points, there is no way to control the midpoint voltage by itself. The midpoint balancing problem is analyzed with respect to the reactive loads with harmonic currents and a way to solve the problem is suggested

Keywords

harmonics; invertors; voltage control; harmonic currents; harmonics; high power; high voltage; large phase angle; midpoint balance analysis; midpoint charge balance; midpoint voltage control; neutral-point-clamped three-level VSI; nonlinear load; reactive loads; three level voltage source inverter; Capacitors; Harmonic analysis; Instruments; Inverters; Phase distortion; Power semiconductor switches; Semiconductor devices; Stress; Topology; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE

Conference_Location

Fukuoka

ISSN

0275-9306

Print_ISBN

0-7803-4489-8

Type

conf

DOI

10.1109/PESC.1998.701899

Filename

701899