Control and modulation scheme for a Cascaded H-Bridge multi-level converter in large scale photovoltaic systems

Multi-level Cascaded H-bridge (CHB) converters are ideal for implementing large scale photovoltaic systems. The improved quality of the voltage waveforms, high efficiency and ability to employ multiple Maximum Power Point Tracking (MPPT) algorithms are just some of the advantages. In this paper a three-phase CHB converter supplied with photovoltaic arrays is considered. A control and modulation structure based on Model Predictive Control (MPC) is described. The scheme inherently controls the DC link voltages while also providing the ability to modify any of those voltages to meet MPPT requirements. This avoids the cost and added complexity of extra DC/DC converters that are typically required to keep the DC link voltages uniform. Simulation and experimental results are presented that confirm the correct operation of the proposed approach.

[1]  Donald Grahame Holmes,et al.  Implementation of a direct digital predictive current controller for single and three phase voltage source inverters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  R.E. Betz,et al.  A digital current controller for three phase voltage source inverters , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[3]  H. Akagi,et al.  Control and Performance of a Medium-Voltage Transformerless Cascade PWM STATCOM with Star-Configuration , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[4]  Hirofumi Akagi,et al.  Instantaneous power theory and applications to power conditioning , 2007 .

[5]  H. Akagi,et al.  Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration , 2007, IEEE Transactions on Industry Applications.

[6]  R. Naderi,et al.  Phase-Shifted Carrier PWM Technique for General Cascaded Inverters , 2008, IEEE Transactions on Power Electronics.

[7]  J. Roudet,et al.  A Modular Strategy for Control and Voltage Balancing of Cascaded H-Bridge Rectifiers , 2008, IEEE Transactions on Power Electronics.

[8]  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.

[9]  U. Ammann,et al.  Predictive Approach to Increase Efficiency and Reduce Switching Losses on Matrix Converters , 2009, IEEE Transactions on Power Electronics.

[10]  H. Abu-Rub,et al.  Model Predictive Control of Cascaded H-Bridge multilevel inverters , 2009, 2009 13th European Conference on Power Electronics and Applications.

[11]  Colin C Davidson,et al.  The future of high power electronics in Transmission and Distribution power systems , 2009, 2009 13th European Conference on Power Electronics and Applications.

[12]  G. Mirzaeva,et al.  Phase leg voltage balancing of a cascaded H-Bridge converter based STATCOM using zero sequence injection , 2009, 2009 13th European Conference on Power Electronics and Applications.

[13]  Haitham Abu-Rub,et al.  Model Predictive Control of Multilevel Cascaded H-Bridge Inverters , 2010, IEEE Transactions on Industrial Electronics.

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

[15]  R.E. Betz,et al.  Optimisation of switching losses and harmonic performance using Model Predictive Control of a Cascaded H-bridge multi-level StatCom , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

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

[17]  N. Senthil Kumar,et al.  Design of optimum Maximum Power Point Tracking algorithm for solar panel , 2011, 2011 International Conference on Computer, Communication and Electrical Technology (ICCCET).

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

[19]  R. E. Betz,et al.  Multigoal Heuristic Model Predictive Control Technique Applied to a Cascaded H-bridge StatCom , 2012, IEEE Transactions on Power Electronics.