Single Phase Single-Stage Transformer Less Renewable Energy System for Micro Grid Applications
Seepelli Praveen1, Samalla Krishna2, Katkuri Laxmi Chaitanya3
1Seepelli Praveen, M.Tech Pursuing, Department of Electrical Power Systems, Tudi Narsimha Reddy Institute of Technology and Science, Gudur (vill) Bibinagar (Mdl), Nalgonda, (A.P.), India.
2Dr. Samalla Krishna, Principal, Department of Electronics & Communication Engineering, Tudi Narasimha Reddy Institute of Technology& Sciences, Hydearabad, (A.P.), India.
3Ms. Katkuri Laxmi Chaitanaya Asst. Prof., Department of Electrical & Electronics Engineering, Tudi Narasimha Reddy Institute of Technology & Sciences, (A.P.), India.
Manuscript received on July 10, 2015. | Revised Manuscript received on July 17, 2015. | Manuscript published on August 15, 2015. | PP: 3-7 | Volume-3 Issue-9, August 2015. | Retrieval Number: I0922083915/2015©BEIESP
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Abstract: In low power renewable systems, a single phase grid-connected converter is usually adopted. This paper deals with a single stage transformer less single phase converter for micro grid applications with PV system is proposed. By using this system the maximum power tracing is possible from PV array to the micro grid. The maximum power point tracing is maintained with a logical controller. A proportional controller is used to control the current injected into the grid a single-phase, single-stage current source inverter based photovoltaic system for grid connection. A double-tuned parallel resonant circuit is designed to attenuate harmonics at the inverter dc side. It helps to improve the power quality and system efficiency. A modified carrier based modulation technique for the current source inverter is studied to magnetize the dc-link inductor and to control the switching pattern for the single phase grid-connected CSI. The operation of Single Phase Transformer-less grid connected PV system is verified by the Simulation and experimental results show the effectiveness of the proposed solution.
Keywords: Distributed power Generation, DC- AC power conversion ,current source inverter grid- connected converters, Single – phase systems, current source converters, Maximum power point tracing (MPT).