Power Quality Improvement for Grid Connected Inverters under Distorted and Unbalanced Grids

Hyun-Sou Kim; Jung-Su Kim; Kyeong-Hwa Kim

Power Quality Improvement for Grid Connected Inverters under Distorted and Unbalanced Grids

Hyun-Sou Kim

Jung-Su Kim

Kyeong-Hwa Kim

Vol. 16, No. 4, pp. 1578-1586, Jul. 2016

10.6113/JPE.2016.16.4.1578

Distorted and unbalanced grid

Distributed generation

Disturbance observer

Grid connected inverter

Power quality

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Abstract

A power quality improvement scheme for grid connected inverters, even in the presence of the disturbances in grid voltages due to harmonic distortions and three-phase imbalance, is presented for distributed generation (DG) power systems. The control objective is to force the inverter currents to follow their references with robustness even under external disturbances in grid voltages. The proposed scheme is realized by a disturbance observer (DOB) based current control scheme. Since the uncertainty in a system can be effectively canceled out using an estimated disturbance by the DOB, the resultant system behaves like a closed-loop system consisting of a disturbance-free nominal model. For experimental verification, a 2 kVA laboratory prototype of a grid connected inverter has been built using a digital signal processor (DSP) TMS320F28335. Through comparative simulations and experimental results under grid disturbances such as harmonic distortion and imbalance, the effectiveness of the proposed DOB based current control scheme is demonstrated.

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Cite this article

[IEEE Style]

H. Kim, J. Kim, K. Kim, "Power Quality Improvement for Grid Connected Inverters under Distorted and Unbalanced Grids," Journal of Power Electronics, vol. 16, no. 4, pp. 1578-1586, 2016. DOI: 10.6113/JPE.2016.16.4.1578.

[ACM Style]

Hyun-Sou Kim, Jung-Su Kim, and Kyeong-Hwa Kim. 2016. Power Quality Improvement for Grid Connected Inverters under Distorted and Unbalanced Grids. Journal of Power Electronics, 16, 4, (2016), 1578-1586. DOI: 10.6113/JPE.2016.16.4.1578.