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DESIGN AND IMPLEMENTATION OF TRANSFORMERLESS INVERTER WITH DC CURRENT ELIMINATION

DESIGN AND IMPLEMENTATION OF TRANSFORMERLESS INVERTER WITH DC CURRENT ELIMINATION. Guided By Dr. Sasidharan Sreedharan. Presented By, SUDHIN P.K PGEE02012. CONTENTS. OBJECTIVE MOTIVATION LITERATURE REVIEW PROPOSED CONVERTER COMPLETE MODEL – BLOCK DIAGRAM EXPECTED OUTCOME GANTT CHART

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DESIGN AND IMPLEMENTATION OF TRANSFORMERLESS INVERTER WITH DC CURRENT ELIMINATION

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  1. DESIGN AND IMPLEMENTATION OF TRANSFORMERLESS INVERTER WITH DC CURRENT ELIMINATION Guided By Dr. Sasidharan Sreedharan Presented By, SUDHIN P.K PGEE02012

  2. CONTENTS • OBJECTIVE • MOTIVATION • LITERATURE REVIEW • PROPOSED CONVERTER • COMPLETE MODEL – BLOCK DIAGRAM • EXPECTED OUTCOME • GANTT CHART • REFERENCES

  3. OBJECTIVE • Phase I : • Simulation : Transformerless Inverter Model • Hardware implementation of Transformerless inverter (Off Grid Model) • Phase II : • PLL Design • Grid Integration of Developed Model

  4. MOTIVATION • Increasing demand of PV system • Development of Cost Effective system • Complete elimination of CM leakage current

  5. WHY ‘LESS’ TOPOLOGY? • Most Commercial PV inverters employ either line-frequency or high-frequency isolation transformers. • Increases – Size,Cost,Losses • Transformerless Topology – Reduced Size, weight, cost and installation complexity • Increases efficiency by 2% • produces Common Mode Leakage Current

  6. The common mode leakage current, • increases the system losses • reduces the grid connected current quality • induces severe conducted and radiated electromagnetic interference • causes personal safety problems.

  7. Literature Review Full H Bridge Topology [5] Half H Bridge Topology [5] Simple Structure High EMI III. High Common mode Leakage Current IV. High Voltage Stress across switches Simple Structure High EMI III. High Common mode Leakage Current

  8. HERIC Topology [6] H5 Topology [7] Large number of Switches Low EMI III. Low Common mode Leakage Current Less number of Switches Low EMI III. Low Common mode Leakage Current

  9. Proposed topology : Concept

  10. Proposed topology

  11. Comparison with Patented Topologies

  12. Complete model 220 V (AC) 400 V (DC) 12/24 V (DC) DC-DC CONVERTER (MPPT) LOAD/ GRID TRANSFORMER-LESS INVERTER Triggering Pulses (SPWM) Triggering Pulses MICRO CONTROLLER MICRO CONTROLLER Vpv,Ipv

  13. EXPECTED OUTCOME • Simulation and Hardware implementation of Transformerless Inverter with complete DC current elimination. • Less voltage and current stress on switches in comparison with HERIC and H5 Topology

  14. GANTT CHART

  15. REFERENCES [1] Gu, Yunjie, Wuhua Li, Yi Zhao, Bo Yang, Chushan Li, and Xiangning He. "Transformerless Inverter with Virtual DC Bus Concept for Cost Effective Grid-connected PV Power Systems." (2013): 1-1. [2] S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, “A review of single-phase grid-connected inverters for photovoltaic modules,” IEEE Trans. Ind.Appl., vol. 41, no. 5, pp. 1292–1306, Sep./Oct. 2005. [3] T. Kerekes, R. Teodorescu, P. Rodr´ıguez, G. V´azquez, and E. Aldabas, “A new high-efficiency single-phase transformerless PV inverter topology,”IEEETrans. Ind. Electron., vol. 58, no. 1, pp. 184–191, Jan. 2011.

  16. REFERENCES [4] Yang, Bo, Wuhua Li, YunjieGu, Wenfeng Cui, and Xiangning He. "Improved transformerless inverter with common-mode leakage current elimination for a photovoltaic grid-connected power system." Power Electronics, IEEE Transactions on 27, no. 2 (2012): 752-762. [5] Patrao, Iván, Emilio Figueres, Fran González-Espín, and Gabriel Garcerá. "Transformerless topologies for grid-connected single-phase photovoltaic inverters." Renewable and Sustainable Energy Reviews 15, no. 7 (2011): 3423-3431. [6] S. Heribert, S. Christoph, and K. Juergen, German Patent HERIC Topology,DE 10221592 A1, Apr. 2003. [7] V. Matthias, G. Frank, B. Sven, and H. Uwe, German Patent H5-Topology,DE 102004030912 B3, Jan. 2006.

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