Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom

This paper further develops a model predictive control (MPC) scheme which is able to exploit the large number of redundant switching states available in a multilevel H-bridge StatCom (H-StatCom). The new sections of the scheme provide optimized methods to tradeoff the harmonic performance with converter switching losses and capacitor voltage ripple. Varying the pulse placement within the modulation scheme and modifying the heuristic model of the voltage balancing characteristics allows the MPC scheme to achieve superior performance to that of the industry standard phase shifted carrier modulation technique. The effects of capacitor voltage ripple on the lifetime of the capacitors are also investigated. It is shown that the MPC scheme can reduce capacitor voltage ripple and increase capacitor lifetime. Simulation and experimental results are presented that confirm the correct operation of the control and modulation strategies.

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

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

[3]  R. E. Betz,et al.  Novel phase shifted carrier modulation for a cascaded H-bridge multi-level StatCom , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[4]  Wenhua Liu,et al.  Multilevel Optimal Modulation and Dynamic Control Strategies for STATCOMs Using Cascaded Multilevel Inverters , 2007, IEEE Transactions on Power Delivery.

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

[6]  Holmes,et al.  Pulse width modulation for power converters , 2003 .

[7]  R. E. Betz,et al.  Voltage balancing characteristics for a cascaded H-bridge multi-level StatCom employing space vector modulation , 2012, 2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC).

[8]  M. Ermis,et al.  VSC-Based D-STATCOM With Selective Harmonic Elimination , 2007, IEEE Transactions on Industry Applications.

[9]  Terrence J. Summers,et al.  Outline of the Control Design for a Cascaded H-Bridge STATCOM , 2008, 2008 IEEE Industry Applications Society Annual Meeting.

[10]  Thomas A. Lipo,et al.  Pulse Width Modulation for Power Converters: Principles and Practice , 2003 .

[11]  Hirofumi Akagi,et al.  Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components , 1984, IEEE Transactions on Industry Applications.

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

[13]  Chung-Yuen Won,et al.  A Real Maximum Power Point Tracking Method for Mismatching Compensation in PV Array Under Partially Shaded Conditions , 2011, IEEE Transactions on Power Electronics.

[14]  S. Parler.  Thermal modeling of aluminum electrolytic capacitors , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[15]  Bin Wu,et al.  Multilevel Voltage-Source-Converter Topologies for Industrial Medium-Voltage Drives , 2007, IEEE Transactions on Industrial Electronics.

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

[17]  Alfred Rufer,et al.  A Generalized Design Principle of a Uniform Step Asymmetrical Multilevel Converter For High Power Conversion , 2001 .

[18]  Pat Wheeler,et al.  DC link balancing and ripple compensation for a cascaded-H-bridge using space vector modulation , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[19]  M A Vogelsberger,et al.  Life-Cycle Monitoring and Voltage-Managing Unit for DC-Link Electrolytic Capacitors in PWM Converters , 2011, IEEE Transactions on Power Electronics.

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

[21]  J.C. Balda,et al.  Lifetime of Electrolytic Capacitors in Regenerative Induction Motor Drives , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[22]  M. Forster,et al.  Reduction of DC bus capacitor ripple current with PAM/PWM converter , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[23]  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.

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

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