Title :
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
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;
Conference_Titel :
Telecommunications Energy Conference, 2000. INTELEC. Twenty-second International
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-6407-4
DOI :
10.1109/INTLEC.2000.884299
