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Energies 2017, 10(8), 1242; doi:10.3390/en10081242

Modelling and Control of Parallel-Connected Transformerless Inverters for Large Photovoltaic Farms

Grupo de Sistemas Electrónicos Industriales del Departamento de Ingeniería Electrónica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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Received: 14 July 2017 / Revised: 10 August 2017 / Accepted: 14 August 2017 / Published: 21 August 2017
(This article belongs to the Special Issue Control and Communication in Distributed Generation Systems)
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Abstract

This paper presents a control structure for transformerless photovoltaic inverters connected in parallel to manage photovoltaic fields in the MW range. Large photovoltaic farms are usually divided into several photovoltaic fields, each one of them managed by a centralized high power inverter. The current tendency to build up centralized inverters in the MW range is the use of several transformerless inverters connected in parallel, a topology that provokes the appearance of significant zero-sequence circulating currents among inverters. To eliminate this inconvenience, this paper proposes a control structure that avoids the appearance of circulating currents by controlling the zero-sequence component of the inverters. A second contribution of the paper is the development of a model of n parallel-connected inverters. To validate the concept, the proposed control structure has been applied to a photovoltaic field of 2 MW managed by four 500 kW photovoltaic inverters connected in parallel. View Full-Text
Keywords: photovoltaic farms; parallel inverters; circulating current; modeling and control photovoltaic farms; parallel inverters; circulating current; modeling and control
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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

Liberos, M.; González-Medina, R.; Garcerá, G.; Figueres, E. Modelling and Control of Parallel-Connected Transformerless Inverters for Large Photovoltaic Farms. Energies 2017, 10, 1242.

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