Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Adaptive Volt-VAr Control Algorithm to Grid Strength and PV Inverter Characteristics

Version 1 : Received: 25 February 2021 / Approved: 26 February 2021 / Online: 26 February 2021 (08:23:33 CET)

A peer-reviewed article of this Preprint also exists.

Gubert, T.C.; Colet, A.; Casals, L.C.; Corchero, C.; Domínguez-García, J.L.; Sotomayor, A.A.; Martin, W.; Stauffer, Y.; Alet, P.-J. Adaptive Volt-Var Control Algorithm to Grid Strength and PV Inverter Characteristics. Sustainability 2021, 13, 4459. Gubert, T.C.; Colet, A.; Casals, L.C.; Corchero, C.; Domínguez-García, J.L.; Sotomayor, A.A.; Martin, W.; Stauffer, Y.; Alet, P.-J. Adaptive Volt-Var Control Algorithm to Grid Strength and PV Inverter Characteristics. Sustainability 2021, 13, 4459.

Journal reference: Sustainability 2021, 13, 4459
DOI: 10.3390/su13084459

Abstract

High-penetration of Distributed Energy Resources (DER) in low voltage distribution grids, mainly photovoltaics (PV), might lead to overvoltage in the point of common coupling. Volt-VAr is one of the common control functions for DER power converters used to enhance the stability and the reliability of the voltage in the distribution system and, thus, fulfilling the network operator requirements. In this study, a centralized algorithm will provide local Volt-VAr control parameters to each PV inverter, based on the electrical grid characteristics where each equipment is installed. Since accurate information of grid characteristics is typically not available, the parametrization of the electrical grid is done using power meter data in DER location and a voltage sensitivity matrix. The algorithm has different optimization modes to both minimize voltage deviation and line current. In order to validate the effectiveness of the algorithm and its deployment in real infrastructure, it has been tested in an experimental setup with PV emulators in a set of 5-day tests. Volt-VAr control algorithm successfully adapted its parameters based on grid topology and PV inverter characteristics, achieving a voltage reduction up to 25% of the allowed voltage deviation.

Subject Areas

Distributed power generation; low-voltage; test facilities; standards; voltage regulation; reactive power; microgrids; photovoltaic systems; optimization methods

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