Comprehensive comparative evaluation of single- and multi-stage three-phase power converters for photovoltaic applications

For utility-scale photovoltaic (PV) power plants, the trend goes towards larger installations with reduced levelized costs of electricity. Further cost reductions can be achieved by modular and redundant inverter topologies, which enable higher reliabilities and a better overall system availability. In this paper, a comparative evaluation of selected three-phase single-and multi-stage voltage source inverters with rated power of 50kW for modular utility-scale PV plants is presented. Based on detailed loss, volume and thermal models, the inverter systems are designed according to a variety of constraints and standards covering a wide range of practical issues, such as grid codes, EMI requirements and lifetime considerations. Finally, for different operational switching frequencies, the optimal topologies are identified by means of an analysis regarding achievable efficiencies, power density and required semiconductor chip areas.

[1]  B. Sahan,et al.  Comparative Evaluation of Three-Phase Current Source Inverters for Grid Interfacing of Distributed and Renewable Energy Systems , 2011, IEEE Transactions on Power Electronics.

[2]  D. Kranzer,et al.  Extreme high efficiency PV-power converters , 2009, 2009 13th European Conference on Power Electronics and Applications.

[3]  Johann W. Kolar,et al.  Overview and Comparison of Grid Harmonics and Conducted EMI Standards for LV Converters Connected to the MV Distribution System , 2012 .

[4]  Johann W. Kolar,et al.  The essence of three-phase PFC rectifier systems , 2011, 2011 IEEE 33rd International Telecommunications Energy Conference (INTELEC).

[5]  M. Alonso-Abella,et al.  Redefinition of the European Efficiency - Finding the Compromise Between Simplicity and Accuracy , 2008 .

[6]  Gerd Griepentrog,et al.  Towards next generation photovoltaic inverters , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[7]  L.M. Tolbert,et al.  Maximum constant boost control of the Z-source inverter , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[8]  J. Muhlethaler,et al.  Modeling and multi-objective optimization of inductive power components , 2012 .

[9]  Johann W. Kolar,et al.  Comparison of the chip area usage of 2-level and 3-level voltage source converter topologies , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

[10]  Friedrich W. Fuchs,et al.  Comparison of transformerless converter topologies for photovoltaic application concerning efficiency and mechanical volume , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[11]  N. Asano,et al.  PV Technology trends and Industry's Role , 2008, 2008 IEEE International Electron Devices Meeting.

[12]  J. W. Kolar,et al.  Optimal design of LCL harmonic filters for three-phase PFC rectifiers , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[13]  U. Borup,et al.  Transformerless Photovoltaic Inverters Connected to the Grid , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[14]  U. Drofenik,et al.  Analyzing the Theoretical Limits of Forced Air-Cooling by Employing Advanced Composite Materials with Thermal Conductivities > 400W/mK , 2006 .

[15]  Joachim Bocker,et al.  Photovoltaic inverter with high efficiency over a wide operation area - a practical approach , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[16]  Tianhao Tang,et al.  Efficiency analysis for three phase grid-tied PV inverter , 2008, 2008 IEEE International Conference on Industrial Technology.

[17]  Peter Zacharias,et al.  Highly Efficient Single-Phase Transformerless Inverters for Grid-Connected Photovoltaic Systems , 2010, IEEE Transactions on Industrial Electronics.

[18]  Florian Krismer,et al.  Modeling and optimization of bidirectional dual active bridge DC-DC converter topologies , 2010 .