Repetitive-Based Controller for a UPS Inverter to Compensate Unbalance and Harmonic Distortion
G. Escobar
A. A. Valdez
J. Leyva-Ramos
P. Mattavelli
Div. of Appl. Math., IPICYT, San Luis Potosi;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2007
Volume: 54,
Issue: 1
On page(s): 504-510
ISSN: 0278-0046
INSPEC Accession Number: 9299074
Digital Object Identifier: 10.1109/TIE.2006.888803
Current Version Published: 2007-02-05
Abstract
This paper discusses a repetitive-based controller for an uninterruptible power supply (UPS) inverter. It is shown that a bank of resonant filters, used as a refinement term for harmonic compensation in earlier works, is equivalent to a repetitive scheme with a particular structure. The latter is implemented using a simple feedback array with a delay line, thus making the implementation relatively easy. More precisely, the repetitive scheme takes a negative feedback structure plus a feedforward path whenever the odd harmonics are considered for compensation only. The repetitive scheme, equivalent to the bank of resonant filters, acts as a refinement term to reject the harmonic distortion caused by the unbalanced and distorted load current, and thus, allowing the UPS inverter to deliver an almost pure sinusoidal balanced voltage. Experimental results in a 1.5 KVA three-phase inverter are included to show the performance of the proposed controller
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