Decentralized Control for Parallel Operation of Distributed Generation Inverters Using Resistive Output Impedance
Guerrero, J.M.
Matas, J.
Luis Garcia de Vicuna
Castilla, M.
Miret, J.
Departament d'Enginyeria de Sistemes, Escola Univ. d'Enginyeria Tecnica Ind. de Barcelona;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: April 2007
Volume: 54,
Issue: 2
On page(s): 994-1004
ISSN: 0278-0046
INSPEC Accession Number: 9400448
Digital Object Identifier: 10.1109/TIE.2007.892621
Current Version Published: 2007-03-19
Abstract
In this paper, a novel wireless load-sharing controller for islanding parallel inverters in an ac-distributed system is proposed. This paper explores the resistive output impedance of the parallel-connected inverters in an island microgrid. The control loops are devised and analyzed, taking into account the special nature of a low-voltage microgrid, in which the line impedance is mainly resistive and the distance between the inverters makes the control intercommunication between them difficult. In contrast with the conventional droop-control method, the proposed controller uses resistive output impedance, and as a result, a different control law is obtained. The controller is implemented by using a digital signal processor board, which only uses local measurements of the unit, thus increasing the modularity, reliability, and flexibility of the distributed system. Experimental results are provided from two 6-kVA inverters connected in parallel, showing the features of the proposed wireless control
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