Title :
Output impedance performance for parallel operation of UPS inverters using wireless and average current-sharing controllers
Author :
Guerrero, J.M. ; De Vicuña, L. Garcia ; Miret, J. ; Mata, J. ; Cruz, J.
Author_Institution :
Dept. of Autom. Control Syst. & Comput. Eng., Tecnica Ind. De Barcelona, Spain
Abstract :
This paper encompasses the study of the output impedance impact of parallel-connected UPS inverters. Two novel nonlinear control strategies are proposed. The first one is based on the single-wire current-sharing scheme, which is well known in parallel dc-to-dc converter systems. The second one is a wireless control technique derived from the droop method. The output impedance of the inverters is investigated in both cases. Results of two parallel-connected 1-kVA UPS inverters show the feasibility of the proposed approach. Finally, the two proposed controllers are compared between them and those with the existing solutions.
Keywords :
DC-DC power convertors; electric current control; invertors; nonlinear control systems; uninterruptible power supplies; 1 kVA; average current-sharing controllers; droop method; nonlinear control strategies; output impedance impact; parallel DC-to-DC converter systems; parallel-connected UPS inverters; single-wire current-sharing scheme; wireless control technique; Automatic control; Communication system control; Control systems; Distributed control; Frequency; Impedance measurement; Inverters; Uninterruptible power systems; Voltage control; Wire;
Conference_Titel :
Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual
Print_ISBN :
0-7803-8399-0
DOI :
10.1109/PESC.2004.1355219
