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Energies 2016, 9(3), 190; doi:10.3390/en9030190

An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions

Department of Electrical and Information Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 139-743, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Shuhui Li
Received: 13 November 2015 / Revised: 4 December 2015 / Accepted: 7 March 2016 / Published: 12 March 2016

Abstract

This paper presents an improved current control strategy for a three-phase grid-connected inverter under distorted grid conditions. The main challenge associated with the grid-connected inverter in distributed generation (DG) systems is to maintain the harmonic contents in output current below the specified values even when the grid is subject to uncertain disturbances such as harmonic distortion. To overcome such a challenge, an improved current control scheme is proposed for a grid-connected inverter, in which the fundamental and harmonic currents are independently controlled by a proportional-integral (PI) decoupling controller and a predictive basis controller, respectively. The controller design approach is based on the model decomposition method, where the measured inverter currents and grid voltages are divided into the fundamental and harmonic components by means of moving average filters (MAFs). Moreover, to detect the angular displacement and angular frequency with better accuracy, even in the presence of the grid disturbance, the MAF is also introduced to implement an enhanced phase-lock loop (PLL) structure. Theoretical analyses as well as comparative simulation results demonstrate that the proposed control scheme can effectively compensate the uncertainties caused by the grid voltages with fast transient response. To validate the feasibility of the proposed scheme, the whole control algorithms are implemented on 2 kVA three-phase grid-connected inverter system using 32-bit floating-point DSP TMS320F28335. As a result, the proposed scheme is an attractive way to control a grid-connected inverter under adverse grid conditions. View Full-Text
Keywords: current control; distorted grid conditions; DSP TMS320F28335; grid-connected inverter; model decomposition; moving average filter current control; distorted grid conditions; DSP TMS320F28335; grid-connected inverter; model decomposition; moving average filter
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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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MDPI and ACS Style

Lai, N.B.; Kim, K.-H. An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions. Energies 2016, 9, 190.

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