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.
Industrial Electronics, IEEE Transactions on
Volume 54, Issue 2, April 2007 Page(s):994 - 1004
Digital Object Identifier 10.1109/TIE.2007.892621
Summary: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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