3 State Current Mode of a Grid Connected PV Converter

Nowadays in applications of renewable energy sources it is important to develop powerful and energy-saving photovoltaic converters and to keep the prescriptions of the standards. In grid connected PV converters the obvious solution to increase the efficiency is to reduce the switching losses. Our new developed control method reduces the switching losses and keeps the limitations of the harmonic distortion standards. The base idea of the method is the utilization of 3-state control causing discontinuous current mode at low input power. In the following sections the control theory, the realizations and the simulation results are presented.

Authors:

• Attila Balogh
• Eszter Varga
• István Varjasi

Keywords:

• Discontinuous current
• high efficiency
• PVconverter
• control method.

References:

[1] A. Balogh, Z. Bilau, I. Varjasi, S. Halasz, "High Efficiency Control of a
Grid Connected PV Converter", In Proc. of EuroPES2007, Palma de
Mallorca, Spain.
[2] I. Varjasi, A. Balogh, S. Halasz, "Sensorless Control of a Grid
Connected PV Converter", in Proc. PEMC2006, Portoroz, Slovenia.
[3] IEC 61727 International Standard, Photovoltaic (PV) systems -
Characteristics of the utility interface, Switzerland, 2004.
[4] A. Balogh, I. Varjasi, Discontinuous Current Mode of a Grid Connected
PV Converter, IYCE2007, Budapest, Hungary
[5] I. Varjasi, A. Balogh, S. Halasz, Sensorless control of a grid connected
PV converter, EPE-PEMC2006, Portoroz., Slovenia.
[6] A. Balogh, Z.T. Bilau and I. Varjasi, High Efficiency Control of a Grid
Connected PV Converter. In Proc. of EuroPES2007, Palma de Mallorca,
Spain.
[7] Attila Balogh, Zoltán Tamás Bilau, Istvan Varjasi Control Algorithm for
High Efficiency Grid Connected PV Converters. In Proc. of IWCIT
2007, Ostrava, Czech Republic.
[8] Attila Balogh, Eszter Varga, István Varjasi: 3SC for Grid Connected
Converters, In Proc. of Power and Energy Systems Conference
(EuroPES 2008), Corfu, Greece, 2008.
[9] Attila Balogh, Zoltan Tamás Bilau, István Varjasi, Sándor Halász: High
Efficiency Control of a Low Noise PV Converter, In Proc. of
Mezsdunarodnaja Naucsno-Tehnicseszkaja Konferencija,Tomszk,
Russia, 2007.