A new PWM method to reduce beat phenomenon in large capacity inverters with low-switching frequency

Author

Iwaji, Yoshitaka ; Sukegawa, Takashi ; Okuyama, Toshiaki ; Ikimi, Takashi ; Shigyou, Masakane ; Tobise, Masahiro

Author_Institution

Power & Ind. Syst. R&D Div., Hitachi Ltd., Ibaraki, Japan

Volume

2

fYear

1997

fDate

5-9 Oct 1997

Firstpage

1512

Abstract

In an asynchronous PWM method, the ratio of the carrier frequency to the fundamental frequency must be at least 15-20 in order to suppress the beat phenomenon. However, it is impossible to achieve this condition for large capacity inverters (e.g. GTO inverters), when the fundamental frequency is high. Assuming that the beat phenomenon is caused by an error generated in the PWM process, the authors introduce a compensator to reduce the error. As a result, beat phenomenon can be decreased for a low carrier frequency. Effectiveness of the proposed method is shown by experimental results

Keywords

DC-AC power convertors; PWM invertors; bipolar transistor switches; compensation; insulated gate bipolar transistors; power bipolar transistors; power semiconductor switches; switching circuits; thyristor convertors; GTO inverters; PWM invertors; asynchronous PWM method; beat phenomenon reduction; carrier frequency; compensator; fundamental frequency; low-switching frequency; AC motors; Error correction; Frequency conversion; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Switching frequency; Switching loss; Synchronous motors; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE

Conference_Location

New Orleans, LA

ISSN

0197-2618

Print_ISBN

0-7803-4067-1

Type

conf

DOI

10.1109/IAS.1997.629053

Filename

629053