NDLI: Design of a robust digital current controller for a grid connected interleaved inverter

Content Provider	IEEE Xplore Digital Library
Author	Abusara, M.A. Sharkh, S.M.
Copyright Year	2010
Description	Author affiliation: School of Engineering Sciences,University of Southampton, Highfield, SO17 1BJ, United Kingdom (Abusara, M.A.; Sharkh, S.M.)
Abstract	This paper is concerned with the design and practical implementation of a robust digital current controller for a three-phase voltage source grid-connected interleaved inverter. Each phase consists of 5 half-bridge channels connected in parallel. Due to the current ripple cancellation of the interleaving topology, only small output filter capacitors are required which provide high impedance to grid voltage harmonics and hence better current quality compared to traditional 2-level LCL topology. The current in each channel is controlled via a single feedback loop. A feedforward loop of the grid voltage is incorporated to compensate for the grid disturbance. To control the high resonance frequency of the output filter, high sampling and switching frequencies are required. Alternatively, resistors in series with the filter capacitors are used to provide damping. This method becomes practically possible due to the low magnitude of the current of the capacitors and consequently low power dissipation in the damping resistors. The paper also studies in detail the effects of computational time delay and grid impedance variation on system stability. A phase lag compensator incorporated in the feedback loop is designed to increase system immunity to grid impedance variations. Simulation and practical results are presented to validate the design.
Starting Page	2903
Ending Page	2908
File Size	1577673
Page Count	6
File Format	PDF
ISBN	9781424463909
e-ISBN	9781424463923
DOI	10.1109/ISIE.2010.5637288
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-04
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inverters Power harmonic filters Delay effects Capacitors Inductors Harmonic analysis Topology
Content Type	Text
Resource Type	Article

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