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Energies 2018, 11(9), 2308; https://doi.org/10.3390/en11092308

DC Offset Error Compensation Algorithm for PR Current Control of a Single-Phase Grid-Tied Inverter

1
Department of Electrical Engineering, Chonbuk National University, Jeollabuk-do 54896, Korea
2
Department of Electrical Engineering, Kyungnam University, Changwon 51767, Korea
2017 IEEE Applied Power Electronics Conference and Exposition (APEC), Tempa, FL, USA, 26–30 March 2017.
*
Author to whom correspondence should be addressed.
Received: 17 July 2018 / Revised: 17 August 2018 / Accepted: 27 August 2018 / Published: 2 September 2018
(This article belongs to the Special Issue Power Electronics 2018)
Full-Text   |   PDF [4879 KB, uploaded 2 September 2018]   |  

Abstract

In a single-phase grid-tied inverter, the direct current (DC) offset error included in the measured grid side phase current has various causes, such as a non-ideal current sensor, unbalanced power supply of an operational amplifier, and nonlinear features of analog components in interface circuits, etc. If the DC offset error is included in the measured current, it causes the secondary harmonic of fundamental frequency and the DC component in grid phase current which result in degradation of inverter performance. In this paper, a theoretical detection method of the secondary harmonic of the fundamental frequency and a DC component in grid phase current for a proportional-resonant (PR) current control system is introduced. Based on the detection method, an algorithm for compensating DC offset error is also presented for single-phase grid-tied inverters. Simulation results and experimental verification of the DC offset error compensation algorithm are shown in this paper. View Full-Text
Keywords: single-phase grid-tied inverter; direct current (DC) offset error; proportional-resonant (PR) current control; DC component; secondary harmonic component single-phase grid-tied inverter; direct current (DC) offset error; proportional-resonant (PR) current control; DC component; secondary harmonic component
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lee, J.S.; Hwang, S.-H. DC Offset Error Compensation Algorithm for PR Current Control of a Single-Phase Grid-Tied Inverter. Energies 2018, 11, 2308.

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