Parallel operation of three-phase UPS inverters by wireless load sharing control

Author

Byun, Y.B. ; Koo, T.G. ; Joe, K.Y. ; Kim, E.S. ; Seo, J.I. ; Kim, D.H.

Author_Institution

Korea Electro-technol. Res. Inst., Kyungnam, South Korea

fYear

2000

fDate

2000

Firstpage

526

Lastpage

532

Abstract

A load sharing control based on the frequency and voltage droop concept for parallel operation of two three-phase uninterruptible power supply (UPS) systems with no control interconnection lines is presented in this paper. First of all, due to the use of active power and reactive power as control variables, the characteristics of output powers according to amplitude and phase differences between output voltages of two UPS systems are analyzed. Secondly, simulation results with different line impedance are demonstrated the feasibility of the wireless load sharing control. Finally, experiments are presented to verify the theoretical discussion with two three-phase 20 kVA UPS systems employed TMS320C32, a kind of real time digital signal processor (DSP)

Keywords

DC-AC power convertors; control system analysis; control system synthesis; invertors; load regulation; reactive power; uninterruptible power supplies; 20 kVA; frequency and voltage droop concept; parallel operation; three-phase UPS inverters; uninterruptible power supply; voltage droop concept; wireless load sharing control; Control systems; Frequency; Impedance; Inverters; Power generation; Power system interconnection; Reactive power control; Real time systems; Uninterruptible power systems; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 2000. INTELEC. Twenty-second International

Conference_Location

Phoenix, AZ

Print_ISBN

0-7803-6407-4

Type

conf

DOI

10.1109/INTLEC.2000.884299

Filename

884299