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Open AccessArticle

Controller for the Grid-Connected Microinverter Output Current Tracking

1
State Research Institute Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania
2
Institute of Regional Development, Siauliai University, P. Visinskio str. 25-402, LT-76351 Siauliai, Lithuania
3
Faculty of Electronics, Vilnius Gediminas Technical University, Naugarduko st. 41, 03227 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(1), 112; https://doi.org/10.3390/sym12010112 (registering DOI)
Received: 19 November 2019 / Revised: 26 December 2019 / Accepted: 2 January 2020 / Published: 7 January 2020
The modification of the proportional–integral (PI) controller with the variable proportional constant for tracking of the grid-connected photovoltaic microinverter output current has been proposed. The obtained results show that in the case when the proportional constant of the PI controller varies in time according to the appropriate law, the microinverter output current sinus shape distortions decrease as compared to the case when the ordinary PI controller is used. The operation of the microinverter with the proposed controller was investigated for the cases when the electrical grid voltage sinus shape is not distorted and when it is distorted by the higher harmonics. View Full-Text
Keywords: grid-connected photovoltaic microinverter; controller; output current tracking; current distortions; grid voltage distortions grid-connected photovoltaic microinverter; controller; output current tracking; current distortions; grid voltage distortions
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Bielskis, E.; Baskys, A.; Valiulis, G. Controller for the Grid-Connected Microinverter Output Current Tracking. Symmetry 2020, 12, 112.

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