Vitor PİRES, J. F. MARTİNS, D. FOİTO, Chen HÃO

A Grid Connected Photovoltaic System With a Multilevel Inverter and a Le-Blanc Transformer

In this paper a novel power conversion structure for grid-connected photovoltaic applications is presented. This structure is based on a multilevel inverter and on a LeBlanc transformer. The proposed multilevel power converter uses two single-phase voltage source inverters and a four wire voltage source inverter. The Le-Blanc transformer is connected at the output of the multilevel inverter. The configuration of the PV system is based on the multi-string technology. The structural design of this new power converter allows a seven level shaped output voltage wave at the output of the multilevel inverter. To control this power converter a sliding mode controller with a vectorial modulator is used. This control system allows obtaining a fast a robust response for the multilevel inverter. Several experimental results are presented, confirming the expected performance of the proposed power conversion structure.

Keywords:

Photovoltaic power conversion, grid connection multilevel converter, LeBlanc transformer, cascade structure, sliding mode controller,

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European Commission, EU Energy Trends to 2030,
Luxembourg, Publications Office of the European Union, accessedon:http://ec.europa.eu/energy/observatory/trends _2030/, 2010.
E. Koutroulis, K. Kalaitzakis, N. C. Voulgaris, “Development of a microcontroller-based, photovoltaic maximum power point tracking control system”. IEEE Transactions Power Electronics, vol. 16, No 1, pp. 46-54, I. Houssamo, F. Locment, M. Sechilariu, “Maximum power Development and experimental comparison of two algorithms”. Renewable Energy, vol. 35, No 10, pp. 2387, 2010. photovoltaic power system:
I. H. Altasa, A. M. Sharaf, “A novel maximum power fuzzy logic controller for photovoltaic solar energy systems”. Renewable Energy, vol. 33, No 3, pp. 388-399, Syafaruddin, E. Karatepe, T. Hiyama, “Polar coordinated fuzzy controller based real-time maximum-power point control of photovoltaic system”. Renewable Energy, vol. , no 12, pp. 2597-2606, 2009.
C. Larbes, S. M. A. Cheikh, T. Obeidi, A. Zerguerras, “Genetic algorithms optimized fuzzy logic control for the maximum power point tracking in photovoltaic system”. Renewable Energy, vol. 34, No 10, pp. 2093-2100, 2009.
T. Tafticht, K. Agbossou, M. L. Doumbia, A. Chériti, “An improved maximum power point tracking method for photovoltaic systems”. Renewable Energy, vol. 33, No 7, pp. 1508-1516, 2008.
A. Chaouachi, R. M. Kamel, K. Nagasaka, “A novel multi-model neuro-fuzzy-based MPPT for three-phase grid-connected photovoltaic system”. Solar Energy ;84(12):2219-2229.
N. Hamrouni, M. Jraidi, A. Chérif, “New control strategy for 2-stage grid-connected photovoltaic power system”. Renewable Energy, vol. 33, no 10 pp. 2212-2221, 2008.
S-K Kim, J-K Jeon, C-H Cho, E-S Kim, J-B Ahn, “Modeling and simulation of a grid-connected PV generation system for electromagnetic transient analysis”. Solar Energy, vol. 83, No 5, pp. 664-678, 2009.
B. Yu, M. Matsui, Y. Jung, G. Yu, “A combined active anti-islanding method for photovoltaic systems”. Renewable Energy, vol. 33, No 10, pp. 979-985, 2008.
A. Menti, T. Zacharias, J. Milias-Argitis, “Harmonic distortion assessment for a single-phase grid-connected photovoltaic system”. Renewable Energy, vol. 36, No 1, pp. 360-368, 2011
A. Nabae, I. Takahashi, and H. Akagi, “A new neutral-point Transactions Industry Applications, vol. IA-17, no. 5, pp. 523, Sep./Oct. 1981. PWM inverter,” IEEE
T. A. Meynard, H. Foch, “Multi-level choppers for high voltage applications,” European Power Electronics Journal, vol. 2, no. 1, pp. 45-50, March 1992.
Peter W. Hammond, “A New Approach to Enhance Power Quality for Medium Voltage AC Drives”, IEEE Transactions on Industry Applications, Vol. 33, No 1, pp. 208, January/February 1997.
J. Rodriguez, J. S. Lai, F. Z. Peng, “Multilevel inverters: a survey of topologies, controls, and applications”. Electronics, vol. 49, No 4, pp. 724-738. Transactions on Industrial F-S Kang, S. E. Cho, S-J Park, C-U Kim, T. Ise, “A new control scheme of a cascaded transformer type multilevel PWM inverter for a residential photovoltaic power ;78(6):727-738. system”. Solar Energy N. A. Rahim, J. Selvaraj, C. Krismadinata, “Five- level inverter with dual reference modulation technique for grid-connected PV system”. Renewable Energy, vol. , No 3, pp. 712-720, 2010.
E. Beser, B. Arifoglu, S. Camur, E. K Beser, “A grid-connected photovoltaic power conversion system with single-phase multilevel inverter”. Solar Energy, vol. , No 12, pp. 2056-2067, 2010.
S. Busquets-Monge, J. Rocabert, P. Rodriguez, S. Alepuz, J. Bordonau, “Multilevel diode-clamped converter for photovoltaic generators with independent voltage control of each solar array”. IEEE Transactions on Industrial Electronics, vol. 55, No 7, pp. 2713-2723,
M. Calais, V. G. Agelidis, M. S. Dymond, “A cascaded inverter for transformerless single-phase grid- connected photovoltaic systems”. Renewable Energy, vol. 22, No 1-3, pp. 255-262, 2001.
M. Calais, V. G. Agelidis, M. Meinhardt, “Multilevel converters for single-phase grid connected photovoltaic systems: an overview”. Solar Energy, Vol. , no 5, pp. 325-335, 1999.
J. Alonso-Martínez, J. Eloy-García, S. Arnaltes, Direct power control of grid connected PV systems with three level NPC inverter. Solar Energy 2010;84(7):1175
A. Ruffer, Ch-B Andrianirina, “A symmetrical 3 phase 2-switch PFC-power supply for variable output voltage”. EPE'95: European Conference on Power Electronics and Aplications, 1995.
S-R Huang, B-N Chen, “Harmonic Study of the Le Blanc Transformer for Taiwan Railway’s Electrification System”. IEEE Transactions on Power Delivery 2002; (2):495-499.
E. Koutroulis, K. Kalaitzakis, N. C. Voulgaris, “Development of a microcontroller-based, photovoltaic maximum power point tracking control system”. IEEE Transactions on Power Electronics, vol. 16, No 1, pp. 46- , 2001.
Soares V, Verdelho P, Marques GD. “Active Power Filter Control Circuit Based on the Instantaneous Active and reactive Current id-iq Method”, Power Electronics Specialists Conference, 1997:1096-1101.
J. F. Silva “Sliding Mode Control Design of Drive and Regulation Electronics for Power Converters”. Special Issue on Power Electronics of Journal on Circuits, Systems and Computers, vol. 5, No 3, pp. 355- , 1995.
V. F. Pires, J. F. Silva, “Three-Phase Single-Stage Four-Switch PFC Buck-Boost Type Rectifier”. IEEE Transactions on Industrial Electronics, vol. 52, No 2, pp. 453, 2005.
V. Utkin, “Variable structure systems with sliding mode”. IEEE Transactions on Automatic Control, vol. , No 2), pp. 212-222, 1977.
W. Gao, J. Hung, “Variable structure control: A Survey”. IEEE Transactions on Industrial Electronics, vol. 40, No 1, pp. 2-22, 1993.