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Decentralized Parallel Operation of Inverters Sharing Unbalanced and Nonlinear Loads

De, Dipankar and Ramanarayanan, Venkataramanan (2010) Decentralized Parallel Operation of Inverters Sharing Unbalanced and Nonlinear Loads. In: IEEE Transactions on Power Electronics, 25 (12). pp. 2995-3025.

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In this paper, a wireless control strategy for parallel operation of three-phase four-wire inverters is proposed. A generalized situation is considered where the inverters are of unequal power ratings and the loads are nonlinear and unbalanced in nature. The proposed control algorithm exploits the potential of sinusoidal domain proportional+multiresonant controller ( in the inner voltage regulation loop) to make the system suitable for nonlinear and unbalanced loads with a simple and generalized structure of virtual output-impedance loop. The decentralized operation is achieved by using three-phase P/Q droop characteristics. The overall control algorithm helps to limit the harmonic contents and the degree of unbalance in the output-voltage waveform and to achieve excellent power-sharing accuracy in spite of mismatch in the inverter output impedances. Moreover, a synchronized turn on with consequent change over to the droop mode is applied for the new incoming unit in order to limit the circulating current completely. The simulation and experimental results from-1 kVA and -0.5 kVA paralleled units validate the effectiveness of the scheme.

Item Type: Journal Article
Publication: IEEE Transactions on Power Electronics
Publisher: IEEE
Additional Information: Copyright 2010 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Microgrid;output impedance; proportional plus multiresonant controller;start-up phase-locked loop (PLL);wireless control.
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 14 Feb 2011 09:03
Last Modified: 14 Feb 2011 09:03
URI: http://eprints.iisc.ac.in/id/eprint/35550

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