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

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ID: 75139
2017
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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.
Reference Key
liberos2017modellingenergies Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Liberos, Marian;González-Medina, Raúl;Garcerá, Gabriel;Figueres, Emilio;
Journal energies
Year 2017
DOI
DOI not found
URL
https://www.mdpi.com/1996-1073/10/8/1242
Keywords
Engineering (General). Civil engineering (General) Technology Electrical engineering. Electronics. Nuclear engineering

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