Title: Fault detection, isolation and compensation of current measurement error in grid connected PV system

Authors: Fatma Ben Youssef; Ahlem Ben Youssef; Lassaad Sbita

Addresses: National Engineering School of Gabes, University of Gabes, Zrig, 6029 Gabes, Tunisia ' Higher Institute of Industrial System, University of Gabes, Street Salaheddine El Ayoubi, 6032 Gabes, Tunisia ' National Engineering School of Gabes, University of Gabes, Zrig, 6029 Gabes, Tunisia

Abstract: Control strategy of grid connected photovoltaic system requires a precise measurement in order to guarantee the desired performance. This work deals with erroneous measurement compensation that can be an occurrence in the grid, such current sensor output as DC offset and scaled error. A simple technique for fault measurement diagnosis and compensation has been investigated to ensure system service continuity. The proposed technique is composed by two steps; the first one consists to isolate the error in one of three phase current. In the second one, fault magnitude is computed and injected to the corresponding signal. In particular, the DC offset and scaled error magnitudes can be determined through analytical analysis of current in the synchronous d-axis at grid angular frequency ωg and 2ωg, respectively. The suggested algorithm does not need additional hardware. Simulation results are presented to demonstrate the effectiveness of the proposed fault detection and compensation method.

Keywords: grid current; fault detection; error compensation; fault isolation; grid angular frequency; current controller.

DOI: 10.1504/IJDSSS.2019.10027384

International Journal of Digital Signals and Smart Systems, 2019 Vol.3 No.4, pp.248 - 267

Received: 22 Sep 2018
Accepted: 23 Feb 2019

Published online: 13 Mar 2020 *

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