An Effective High Step-Up Interleaved DC-DC Converter Photovoltaic Grid Connection System
G. Lakpathi1, S. Manohar Reddy2, K. Lakshmi Ganesh3, G. Satyanarayana4

1G. Lakpathi, Department of Electrical & Electronics Engineering, TKR college of Engineering & technology, meerpet, saroornagar, Hyderabad District, A.P, India.
2S. Manohar Reddy, Department of Electrical & Electronics Engineering, TKR college of Engineering & technology, meerpet, saroornagar, Hyderabad. District, A.P, India.
3K. Lakshmi Ganesh, MIAEME, Asst. Professor, Department of Electrical & Electronics Engineering, Vishnu Institute of Technology, vishnupur, Bhimavaram, W.G. District, A.P,India.
4G. Satyanarayana, M.Tech, PGDBM, School of Management Studies, University of  Hyderabad, India.
Manuscript received on August 04, 2013. | Revised Manuscript received on August 28, 2013. | Manuscript published on September 05, 2013. | PP: 156-163 | Volume-3, Issue-4, September 2013. | Retrieval Number: D1804093413/2013©BEIESP
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Abstract: Within the photovoltaic (PV) power generation systems in the market, the ac PV module has shown obvious growth. However, a high voltage gain converter is concentrate for the module’s grid connection with dc-ac inverter. This paper proposed a converter that employs a floating active switch to isolate energy from the PV panel when the ac module is OFF; this particular design protects installers and users from electrical hazards. Without extreme duty ratios and numerous turns-ratio of a coupled inductor, this converter achieves a high step-up voltage-conversion ratio; the leakage inductor energy of the coupled inductor is efficiently recycled to the load. These features explain about module’s high-efficiency performance. The detailed operating principles and steady-state analyses of continuous mode is described. A 15 volts produces from photovoltaic which is connects to high step-up dc-dc converter to produces output voltage of 170 volts. The novel proposed system is “an effective high step up interleaved dc-dc converter photovoltaic grid connection system”. In this configuration consists of PV array, high step-up interleaved dc-dc converter and three-phase inverter with grid connected system. In this system, the THD value per phase voltage of three phase inverter output without filter is 1.74% with grid connection system. In this same configuration with 2nd order filter connected of three phase inverter output, the THD value reduced to 0.08%. The results are shown in Matlab/simulink 2009a.
Keywords: AC module, coupled inductor, high step-up voltage gain, single switch, three-phase inverter, grid connection.