Output impedance of PWM UPS inverter-feedback vs. filters

Author

Kusko, A. ; Galler, D. ; Medora, N.

Author_Institution

Failure Anal. Associates, Inc., Westborough, MA, USA

fYear

1990

fDate

7-12 Oct. 1990

Firstpage

1044

Abstract

The output impedance of an uninterruptible power supply (UPS), which determines the voltage distortion caused by switchmode power supplies, rectifiers, and other nonlinear loads, is reviewed. Step-wave inverters that use shunt filter traps to attenuate the voltage harmonics and thereby present a low impedance to the harmonic load currents of the same order are discussed. Another approach to reducing the output impedance of pulse-width modulation (PWM) inverters, using the negative-feedback technique of the amplifier, is also discussed. Conclusions concerning the use of filters and feedback in the design of PWMs for UPSs are summarized.<>

Keywords

electric impedance; feedback; filters; harmonics; invertors; pulse width modulation; rectifiers; switched mode power supplies; uninterruptible power supplies; PWM UPS inverter; negative-feedback; nonlinear loads; output impedance; rectifiers; shunt filter traps; switchmode power supplies; uninterruptible power supply; voltage distortion; voltage harmonics attenuation; Impedance; Power harmonic filters; Power supplies; Pulse amplifiers; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Rectifiers; Uninterruptible power systems; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE

Conference_Location

Seattle, WA, USA

Print_ISBN

0-87942-553-9

Type

conf

DOI

10.1109/IAS.1990.152313

Filename

152313