Step-Down Partial Power DC-DC Converters for Two-Stage Photovoltaic String Inverters
| Autor: | Gonzalo Carrasco, Samir Kouro, Thierry Meynard, Jaime W. Zapata |
|---|---|
| Přispěvatelé: | Convertisseurs Statiques (LAPLACE-CS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Dc-dc converters
Computer Networks and Communications Computer science 020209 energy lcsh:TK7800-8360 02 engineering and technology 7. Clean energy Maximum power point tracking photovoltaic energy Dc–dc converters 0202 electrical engineering electronic engineering information engineering Grid connection Energy transformation Electrical and Electronic Engineering partial power converters business.industry lcsh:Electronics 020208 electrical & electronic engineering Photovoltaic system Energy conversion efficiency [SPI.NRJ]Engineering Sciences [physics]/Electric power Electrical engineering Converters [SPI.TRON]Engineering Sciences [physics]/Electronics Hardware and Architecture Control and Systems Engineering Signal Processing string inverter business Decoupling (electronics) Voltage |
| Zdroj: | Electronics Electronics, Penton Publishing Inc., 2019, 8 (1), pp.87. ⟨10.3390/electronics8010087⟩ Electronics, Vol 8, Iss 1, p 87 (2019) Volume 8 Issue 1 |
| ISSN: | 0883-4989 |
| DOI: | 10.3390/electronics8010087⟩ |
| Popis: | International audience; Photovoltaic (PV) systems composed by two energy conversion stages are attractive from an operation point of view. This is because the maximum power point tracking (MPPT) range is extended, due to the voltage decoupling between the PV system and the dc-link. Nevertheless, the additional dc-dc conversion stage increases the volume, cost and power converter losses. Therefore, central inverters based on a single-stage converter, have been a mainstream solution to interface large-scale PV arrays composed of several strings connected in parallel made by the series connections of PV modules. The concept of partial power converters (PPC), previously reported as a voltage step-up stage, has not addressed in depth for all types of PV applications. In this work, a PPC performing voltage step-down operation is proposed and analyzed. This concept is interesting from the industry point of view, since with the new isolation standards of PV modules are reaching 1500 V, increasing both the size of the string and dc-link voltage for single-stage inverters. Since grid connection remains typically at 690 V, larger strings impose more demanding operation for single-stage central inverters (required to operate at lower modulation indexes and demand higher blocking voltage devices), making the proposed step-down PPC an attractive solution. Theoretical analysis and an experimental test-bench was built in order to validate the PPC concept, the control performance and the improvement of the conversion efficiency. The experimental results corroborate the benefits of using a PPC, in terms of increasing the system efficiency by reducing the processed power of the converter, while not affecting the system performance. |
| Databáze: | OpenAIRE |
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