Modified Dual-stage Inverter Applied in a Three-phase Grid-connected Pv System Using Behavior Matching Technique

Marcio M. Casaro; Lenon Schmitz; Carolina Knaesel; Denizar Cruz Martins

doi:10.18618/REP.2013.1.793803

Authors

Marcio M. Casaro Federal University of Santa Catarina– Florianopolis, SC – Brazil
Lenon Schmitz Federal University of Santa Catarina – Florianopolis, SC – Brazil
Carolina Knaesel Federal University of Santa Catarina – Florianopolis, SC – Brazil
Denizar Cruz Martins Federal University of Santa Catarina – Florianopolis, SC – Brazil

DOI:

https://doi.org/10.18618/REP.2013.1.793803

Keywords:

Behavior Matching, Dual-Stage Inverter, Grid-Connected PV System

Abstract

This paper presents a grid-connected PV system in a centralized configuration and constructed through a three-phase dual-stage inverter. In this topology, usually, a DC-DC converter performs the maximum power point tracking (MPPT) and an inverter is responsible for controlling the grid-current. For the DC-DC stage the three-phase series resonant converter (SRC3) is chosen thanks to the advantages that it exhibits. However, it is inadequate for the accomplishment of MPPT, due to its efficiency strongly dependent on the implemented deadtime and switching frequency. Then, this paper proposes a conceptual modification, i.e., a modified dual-stage inverter in which the inverter stage is responsible for both the MPPT and the grid-current control. In addition, the DC-DC converter operates with constant duty cycle and frequency. Such configuration requires a new concept, introduced as Behavior Matching. It serves as a fundamental feature for the DC-DC converter to reproduce the PV array I-V characteristic when they are connected, without control action. The maximum power operating point (MPOP) is found by maximizing the direct axis current, obtained by Park’s transformation from the inverter, through the perturbation and observation algorithm (P&O). Any specific measurement to realize MPPT is not needed. The galvanic isolation is achieved by using a high-frequency transformer. The structure is appropriate for high power applications, above 10 kW.

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Author Biographies

Marcio M. Casaro, Federal University of Santa Catarina– Florianopolis, SC – Brazil

was born in Assis, Brazil, in 1972. He received the B.S. degree from Unilins - School of Engineering, Lins, Brazil, and the M.S. and Ph.D. degrees from Federal University of Santa Catarina, Florianópolis, Brazil, all in electrical engineering, in 1994, 1996 and 2009, respectively. He has been working for Federal University of Technology - UTFPR since 1997 as a lecturer of the Department of Electrical Engineering. He is a member of the Brazilian Power Electronics Society. His research interests include power electronics converters and their applications.

Lenon Schmitz, Federal University of Santa Catarina – Florianopolis, SC – Brazil

was born in Blumenau, SC, Brazil, on March 28, 1990. He is in the last semester to receive the B.S. degree in electrical engineering from Federal University of Santa Catarina, Florianópolis, SC, Brazil, and he has been a scientific initiation scholarship student at the Power Electronics Institute since 2010. He was co-author in two scientific papers in the grid-connected systems areas. His interest research field includes dc-dc and dc-ac converters, grid-connected systems and renewable energy.

Carolina Knaesel, Federal University of Santa Catarina – Florianopolis, SC – Brazil

was born in Blumenau, SC, Brazil, on August 11, 1991. She is in the sixth semester of undergraduate electrical engineering at Federal University of Santa Catarina, Florianópolis, SC, Brazil, and she has been a scientific initiation scholarship student at the Power Electronics Institute since 2012. Her interest research areas include dc-dc and dc-ac converters, grid-connected systems and renewable energy.

Denizar Cruz Martins, Federal University of Santa Catarina – Florianopolis, SC – Brazil

was born in São Paulo, Brazil, on April 24, 1955. He received the B.S. and M.S. degrees in electrical engineering from Federal University of Santa Catarina, Florianópolis, SC, Brazil, in 1978 and 1981, respectively, and the Ph.D. degree in electrical engineering from the Polytechnic National Institute of Toulouse, Toulouse, France, in 1986. He is currently a Titular Professor in the Department of Electrical Engineering at Federal University of Santa Catarina. . He is a member of the Brazilian Power Electronics Society. His interest research areas include dc-dc and dc-ac converters, high frequency, soft commutation, power factor correction and gridconnected PV systems.

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