Optimal VF-PDPC of grid connected inverter under unbalanced and distorted grid voltages
Optimal VF-PDPC of grid connected inverter under unbalanced and distorted grid voltages
In this article, an optimal virtual flux predictive direct power control (VF-PDPC) is proposed for three-phase grid connected voltage source inverter (VSI) operating under unbalanced and distorted grid supply voltage. The concept of virtual flux and extension pq theory is introduced in the conventional PDPC, where the former enhances its resilience toward distorted supply voltage while the latter enhances its resilience toward unbalanced supply voltage. The inherent advantages of the conventional PDPC scheme, such as simple implementation, fast dynamic responses, and no demand of modulators are retained. Getting rid of the complicated positive and negative sequence extraction of grid components, power compensation, or any tuning work, the proposed optimal VF-PDPC achieves excellent power tracking capability, and sinusoidal grid currents with low harmonics under various grid voltage conditions. Simulation results are presented to verify the effectiveness of the proposed control scheme when compared to the conventional PDPC, conventional VF-PDPC, and optimal PDPC.
1-8
Lee, Sze Sing
bd57e2af-031e-4ff1-aa50-9c0189a813bc
Heng, Yeh En
6860b43b-9bb5-4553-901f-397d71801b4b
November 2016
Lee, Sze Sing
bd57e2af-031e-4ff1-aa50-9c0189a813bc
Heng, Yeh En
6860b43b-9bb5-4553-901f-397d71801b4b
Lee, Sze Sing and Heng, Yeh En
(2016)
Optimal VF-PDPC of grid connected inverter under unbalanced and distorted grid voltages.
Electric Power Systems Research, 140, .
(doi:10.1016/j.epsr.2016.07.006).
Abstract
In this article, an optimal virtual flux predictive direct power control (VF-PDPC) is proposed for three-phase grid connected voltage source inverter (VSI) operating under unbalanced and distorted grid supply voltage. The concept of virtual flux and extension pq theory is introduced in the conventional PDPC, where the former enhances its resilience toward distorted supply voltage while the latter enhances its resilience toward unbalanced supply voltage. The inherent advantages of the conventional PDPC scheme, such as simple implementation, fast dynamic responses, and no demand of modulators are retained. Getting rid of the complicated positive and negative sequence extraction of grid components, power compensation, or any tuning work, the proposed optimal VF-PDPC achieves excellent power tracking capability, and sinusoidal grid currents with low harmonics under various grid voltage conditions. Simulation results are presented to verify the effectiveness of the proposed control scheme when compared to the conventional PDPC, conventional VF-PDPC, and optimal PDPC.
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Accepted/In Press date: 3 July 2016
e-pub ahead of print date: 10 July 2016
Published date: November 2016
Organisations:
EEE
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Local EPrints ID: 400349
URI: http://eprints.soton.ac.uk/id/eprint/400349
ISSN: 0378-7796
PURE UUID: 3614b4d7-a209-47eb-bc64-9b180e66057f
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Date deposited: 14 Sep 2016 15:44
Last modified: 15 Mar 2024 02:15
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Author:
Sze Sing Lee
Author:
Yeh En Heng
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