High Step-Up DC–AC Inverter Suitable for AC Module Applications

In this paper, a novel grid-connected high step-up inverter is proposed. The topology is composed of two stages. The first stage is a single-switch high step-up dc-dc converter with bipolar outputs, and the second stage is a conventional half-bridge dc-ac grid-connected inverter. Negative grounding of the photovoltaic (PV) module has resulted in elimination of unwanted ground leakage currents in the PV system. Simple structure, employing few semiconductor switches, simple control, and high efficiency are the features of the proposed topology. Theoretical analysis and principal operation of the circuit are discussed. An experimental prototype is implemented to verify the performance of the proposed inverter. The experimental results confirm the aforementioned features and the theoretical analysis of the converter operation.

[1]  Ka Wai Eric Cheng,et al.  Design and analysis of switched-capacitor-based step-up resonant converters , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[2]  F. Blaabjerg,et al.  Review and Comparison of Step-Up Transformerless Topologies for Photovoltaic AC-Module Application , 2013, IEEE Transactions on Power Electronics.

[3]  C.-Y. Lin,et al.  High-efficiency, high-step-up DC-DC convertor for fuel-cell generation system , 2005 .

[4]  Shaojun Xie,et al.  Leakage Current Analytical Model and Application in Single-Phase Transformerless Photovoltaic Grid-Connected Inverter , 2010, IEEE Transactions on Electromagnetic Compatibility.

[5]  E. Koutroulis,et al.  Optimal Design of Modern Transformerless PV Inverter Topologies , 2013, IEEE Transactions on Energy Conversion.

[6]  L.M. Tolbert,et al.  Novel multilevel inverter carrier-based PWM methods , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[7]  P.N. Enjeti,et al.  Analysis and evaluation of a series-combined connected boost and buck-boost dc-dc converter for photovoltaic application , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[8]  Quan Li,et al.  A Review of the Single Phase Photovoltaic Module Integrated Converter Topologies With Three Different DC Link Configurations , 2008, IEEE Transactions on Power Electronics.

[9]  F. Blaabjerg,et al.  A review of single-phase grid-connected inverters for photovoltaic modules , 2005, IEEE Transactions on Industry Applications.

[10]  Wuhua Li,et al.  Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications , 2011, IEEE Transactions on Industrial Electronics.

[11]  Marco Liserre,et al.  The high efficiency transformer-less PV inverter topologies derived from NPC topology , 2009, 2009 13th European Conference on Power Electronics and Applications.

[12]  R. Wai,et al.  High step-up DC-DC converter for fuel cell generation system , 2004, 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004.

[13]  Fred C. Lee,et al.  High-efficiency, high step-up DC-DC converters , 2003 .

[14]  Makarand Sudhakar Ballal,et al.  Soft-Switching DC–DC Converter for Distributed Energy Sources With High Step-Up Voltage Capability , 2015, IEEE Transactions on Industrial Electronics.

[15]  Xinbo Ruan,et al.  Nonisolated High Step-Up DC–DC Converters Adopting Switched-Capacitor Cell , 2015, IEEE Transactions on Industrial Electronics.

[16]  Samir Kouro,et al.  Reduced Switching-Frequency-Modulation Algorithm for High-Power Multilevel Inverters , 2007, IEEE Transactions on Industrial Electronics.

[17]  Rong-Jong Wai,et al.  High step-up converter with coupled-inductor , 2005 .

[18]  Henry Shu-Hung Chung,et al.  Generalized structure of bi-directional switched-capacitor DC/DC converters , 2003 .

[19]  Yaow-Ming Chen,et al.  Boost Converter with Coupled Inductors and Buck-Boost Type of Active Clamp , 2005 .

[20]  S.V. Araujo,et al.  Novel grid-connected non-isolated converters for photovoltaic systems with grounded generator , 2008, 2008 IEEE Power Electronics Specialists Conference.

[21]  Man Hyung Lee,et al.  A new single-phase five-level PWM inverter employing a deadbeat control scheme , 2003 .

[22]  J. Bordonau,et al.  Topologies of single-phase inverters for small distributed power generators: an overview , 2004, IEEE Transactions on Power Electronics.

[23]  T. Habetler,et al.  Novel Multilevel Inverter Carrier-Based PWM Method , 2000 .

[24]  Fernando L. M. Antunes,et al.  Multilevel Inverter Topologies for Stand-Alone PV Systems , 2013, IEEE Transactions on Industrial Electronics.

[25]  Hurng-Liahng Jou,et al.  Novel Transformerless Grid-Connected Power Converter With Negative Grounding for Photovoltaic Generation System , 2012, IEEE Transactions on Power Electronics.