Adaptive phase-shifted PWM for multilevel cascaded H-bridge converters with large number of power cells

Cascaded H-bridge multilevel converters are usually applied for high-power systems with independent dc sources. It can be used as PV inverter or to operate independent battery stacks. In these cases, as each dc source can be working at different operational points, conventional modulators lead to high distorted output waveforms degrading the converter performance. In this paper, a modulation method as a modified version of conventional phase-shifted PWM is presented when the CHB converter has a large number of power cells. This method is an extension of a previous technique only suitable for CHB converters with three power cells per phase. Simulation results show the good performance of the proposal with higher number of cells.

[1]  P. Barrade,et al.  Direct Connection of Supercapacitors to Photovoltaic Panels With On–Off Maximum Power Point Tracking , 2012, IEEE Transactions on Sustainable Energy.

[2]  Pablo Correa,et al.  Control of a Single-Phase Cascaded H-Bridge Multilevel Inverter for Grid-Connected Photovoltaic Systems , 2009, IEEE Transactions on Industrial Electronics.

[3]  Marco Liserre,et al.  Multilevel Phase-Shifting Carrier PWM Technique in case of Non-Equal dc-Link Voltages , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[4]  Akshay Kumar Rathore,et al.  Fundamental Switching Frequency Optimal Pulsewidth Modulation of Medium-Voltage Cascaded Seven-Level Inverter , 2014, IEEE Transactions on Industry Applications.

[5]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.

[6]  Domingo Biel Solé,et al.  Energy-balance control of PV cascaded multilevel grid-connected inverters for phase-shifted and level-shifted pulse-width modulations , 2012 .

[7]  Akshay Kumar Rathore,et al.  Fundamental Switching Frequency Optimal Pulsewidth Modulation of Medium-Voltage Cascaded Seven-Level Inverter , 2015 .

[8]  F. Blaabjerg,et al.  Power electronics for renewable energy systems , 2006, 2009 International Conference on Power Engineering, Energy and Electrical Drives.

[9]  Enrique Romero-Cadaval,et al.  Grid-Connected Photovoltaic Generation Plants: Components and Operation , 2013, IEEE Industrial Electronics Magazine.

[10]  Francesc Guinjoan,et al.  Energy-Balance Control of PV Cascaded Multilevel Grid-Connected Inverters Under Level-Shifted and Phase-Shifted PWMs , 2013, IEEE Transactions on Industrial Electronics.

[11]  Samir Kouro,et al.  Multidimensional Modulation Technique for Cascaded Multilevel Converters , 2011, IEEE Transactions on Industrial Electronics.

[12]  L.G. Franquelo,et al.  The age of multilevel converters arrives , 2008, IEEE Industrial Electronics Magazine.

[13]  Leopoldo García Franquelo,et al.  Challenges of the Current Energy Scenario: The Power Electronics Contribution , 2014 .

[14]  Bin Wu,et al.  Cascaded H-bridge multilevel converter topology and three-phase balance control for large scale photovoltaic systems , 2012, 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG).

[15]  Samir Kouro,et al.  Variable-Angle Phase-Shifted PWM for Multilevel Three-Cell Cascaded H-Bridge Converters , 2017, IEEE Transactions on Industrial Electronics.

[16]  Bin Wu,et al.  Recent Advances and Industrial Applications of Multilevel Converters , 2010, IEEE Transactions on Industrial Electronics.

[17]  Mohsen Hamzeh,et al.  Integrating hybrid power source into an islanded MV microgrid using CHB multilevel inverter under unbalanced and nonlinear load conditions , 2014, 2014 IEEE PES General Meeting | Conference & Exposition.

[18]  Leopoldo G. Franquelo,et al.  Grid-Connected Photovoltaic Systems: An Overview of Recent Research and Emerging PV Converter Technology , 2015, IEEE Industrial Electronics Magazine.

[19]  Leopoldo García Franquelo,et al.  Advanced control of a multilevel cascaded H-bridge converter for PV applications , 2014, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society.

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

[21]  Bin Wu,et al.  The Essential Role and the Continuous Evolution of Modulation Techniques for Voltage-Source Inverters in the Past, Present, and Future Power Electronics , 2016, IEEE Transactions on Industrial Electronics.

[22]  K. Baskaran,et al.  Efficient Sequential Switching Hybrid-Modulation Techniques for Cascaded Multilevel Inverters , 2011, IEEE Transactions on Power Electronics.

[23]  Hui Li,et al.  A Cascaded Photovoltaic System Integrating Segmented Energy Storages With Self-Regulating Power Allocation Control and Wide Range Reactive Power Compensation , 2011, IEEE Transactions on Power Electronics.

[24]  Giampaolo Buticchi,et al.  A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems , 2014, IEEE Transactions on Industrial Electronics.

[25]  Nakkireddyvari Bhargavi,et al.  Modular Cascaded H-Bridge Multilevel PV Inverter with Distributed MPPT for Grid-Connected Applications , 2016 .

[26]  Bin Wu,et al.  Control of a cascaded H-bridge multilevel converter for grid connection of photovoltaic systems , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[27]  J. Rodriguez,et al.  Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems , 2011, 2011 IEEE International Symposium on Industrial Electronics.

[28]  Younghoon Cho,et al.  A Carrier-Based Neutral Voltage Modulation Strategy for Multilevel Cascaded Inverters Under Unbalanced DC Sources , 2014, IEEE Transactions on Industrial Electronics.

[29]  Marcelo A. Pérez,et al.  Multilevel Converters: An Enabling Technology for High-Power Applications , 2009, Proceedings of the IEEE.