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 Inverterâ€
1
Department of Electrical Engineering, Chonbuk National University, Jeollabuk-do 54896, Korea
2
Department of Electrical Engineering, Kyungnam University, Changwon 51767, Korea
â€
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)
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-TextKeywords:
single-phase grid-tied inverter; direct current (DC) offset error; proportional-resonant (PR) current control; DC component; secondary harmonic component
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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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