Performance of average current mode controlled PWM UPS inverter with high crest factor load

Author

Fraser, M.E. ; Manning, C.D.

Author_Institution

Loughborough Univ. of Technol., UK

fYear

1994

fDate

26-28 Oct 1994

Firstpage

661

Lastpage

667

Abstract

This paper highlights the problems encountered when attempting to supply a high crest factor load from a UPS inverter. Inverter voltage control using an inner loop consisting of an average current mode controller and an outer loop is investigated. The choice of parameters, filter components and compensators, are discussed. Simulation results show the steady state and dynamic performance of the inverter. The addition of load current feedforward can cause the system to become unstable and is explained with the aid of simplified control models. The inverter under consideration is rated at 30 kVA with a PWM switching frequency of 15 kHz

Keywords

PWM invertors; circuit analysis computing; circuit stability; control system analysis computing; digital simulation; electric current control; feedforward; load (electric); power engineering computing; uninterruptible power supplies; voltage control; 15 kHz; 30 kVA; PWM UPS inverter; average current mode control; compensators; computer simulation; dynamic performance; feedforward; filter components; high crest factor load; inner loop; instability; outer loop; parameters; steady state performance; switching frequency; voltage control;

fLanguage

English

Publisher

iet

Conference_Titel

Power Electronics and Variable-Speed Drives, 1994. Fifth International Conference on

Conference_Location

London

Type

conf

DOI

10.1049/cp:19941043

Filename

341631