A Medium Voltage AC Drive with Parallel Current Source Inverters For High Power Applications

Author

Xu, D. ; Zargari, N.R. ; Wu, B. ; Wiseman, J. ; Yuwen, B. ; Rizzo, S.

Author_Institution

Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, Ont.

fYear

2005

fDate

16-16 June 2005

Firstpage

2277

Lastpage

2283

Abstract

A power circuit topology suitable for large medium voltage AC drive applications is presented. The line side harmonics requirements are met by using an 18 pulse phase-controlled rectifier. The output horsepower of the drive is increased by connecting two inverters in parallel. The low switching frequency used in the inverters makes this approach especially attractive in very high power applications. A new control scheme is proposed to ensure proper current sharing between the two output inverters even when the power switching devices and the two bridges are severely asymmetric. The start up issues and the control response to transient conditions are analyzed and the boundaries of the controllability of the system are discussed. The proposed system is experimentally verified by a 208 V, 5 hp laboratory set up

Keywords

AC motor drives; bridge circuits; controllability; harmonic analysis; invertors; phase control; switching convertors; 208 V; current sharing; high power applications; medium voltage AC drive; parallel current source inverters; phase-controlled rectifier; power circuit topology; power switching devices; system controllability; transient conditions; Bridge circuits; Circuit topology; Control systems; Controllability; Inverters; Joining processes; Medium voltage; Rectifiers; Switching frequency; Transient analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th

Conference_Location

Recife

Print_ISBN

0-7803-9033-4

Type

conf

DOI

10.1109/PESC.2005.1581949

Filename

1581949