Title :
Steady-state invariant frequency and amplitude droop control using adaptive output impedance for parallel-connected UPS inverters
Author :
Guerrero, Josep M. ; De Vicuna, Luis Garcia ; Matas, Jose ; Miret, Jaume ; Cruz, J.
Author_Institution :
Sustainable Distributed Generation Syst. & Renewable Energy Group, Escola Univ. d´´Enginyeria Tecnica Industrial de Barcelona
Abstract :
In this paper, a novel wireless load-sharing controller for parallel connected UPS inverters is proposed. As opposed to the conventional droop method, the proposed method achieves stable steady-state frequency and amplitude. The paper explorers the output impedance of the UPS inverters, and adaptive virtual output impedance is proposed in order to reduce its line impedance impact. Experimental results are presented from two 6 kVA UPS inverters controlled by TMS320LF2407A DSP boards, showing the feasibility of the proposed approach
Keywords :
digital control; digital signal processing chips; invertors; load regulation; power engineering computing; uninterruptible power supplies; 6 kVA; TMS320LF2407A DSP boards; adaptive virtual output impedance; amplitude droop control method; load-sharing controller; parallel-connected UPS inverters; steady-state frequency; steady-state invariant frequency; Adaptive control; Control systems; Frequency; Impedance; Inverters; Power engineering and energy; Programmable control; Reactive power; Steady-state; Uninterruptible power systems;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2005. APEC 2005. Twentieth Annual IEEE
Conference_Location :
Austin, TX
Print_ISBN :
0-7803-8975-1
DOI :
10.1109/APEC.2005.1452997
