A distributed PWM strategy for modular multilevel converter

The modular multilevel converter (MMC) has become a potential candidate for medium/high-power applications including high-voltage direct current (HVDC) transmission, adjustable speed drive, and static var compensation systems. One of the technical challenges associated with the control of an MMC is the choice of pulse width modulation (PWM) strategy along with a submodule (SM) capacitor voltage balancing algorithm without imposing high computational burden on the controller and/or unnecessary switching transitions among the SMs. This paper proposes a distributed PWM strategy with an improved SM capacitor voltage balancing algorithm which aims at reducing the computational burden of the controller, the electro-magnetic interference and the switching frequency. The validity of the proposed PWM strategy and the SM capacitor voltage balancing algorithm is confirmed by simulation and experimental results.

[1]  I. Hasegawa,et al.  Startup and low-speed operation of an adjustable-speed motor driven by a modular multilevel cascade inverter (MMCI) , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  H. Akagi,et al.  Control and Analysis of the Modular Multilevel Cascade Converter Based on Double-Star Chopper-Cells (MMCC-DSCC) , 2011, IEEE Transactions on Power Electronics.

[3]  Maryam Saeedifard,et al.  Reduced switching-frequency voltage-balancing strategies for modular multilevel HVDC converters , 2013, 2014 IEEE PES General Meeting | Conference & Exposition.

[4]  Manfred Winkelnkemper,et al.  Low output frequency operation of the Modular Multi-Level Converter , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[5]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[6]  Makoto Hagiwara,et al.  Negative-Sequence Reactive-Power Control by a PWM STATCOM Based on a Modular Multilevel Cascade Converter (MMCC-SDBC) , 2012 .

[7]  McDonald,et al.  Transformerless STATCOM based on a five-level modular multilevel converter , 2009 .

[8]  Zhe Chen,et al.  A Control Method for Voltage Balancing in Modular Multilevel Converters , 2014, IEEE Transactions on Power Electronics.

[9]  K. Ilves,et al.  Modular multilevel converter ac motor drives with constant torque form zero to nominal speed , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[10]  Zheng Xu,et al.  Suppressing DC Voltage Ripples of MMC-HVDC Under Unbalanced Grid Conditions , 2012, IEEE Transactions on Power Delivery.

[11]  Georgios Konstantinou,et al.  Active Redundant Submodule Configuration in Modular Multilevel Converters , 2013, IEEE Transactions on Power Delivery.

[12]  Kai Zhang,et al.  An Improved Control System for Modular Multilevel Converters with New Modulation Strategy and Voltage Balancing Control , 2015, IEEE Transactions on Power Electronics.

[13]  Staffan Norrga,et al.  Tolerance Band Modulation Methods for Modular Multilevel Converters , 2015 .

[14]  H. P. Mohammadi,et al.  A Transformerless Medium-Voltage STATCOM Topology Based on Extended Modular Multilevel Converters , 2011, IEEE Transactions on Power Electronics.

[15]  H. Akagi,et al.  Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters , 2009, IEEE Transactions on Power Electronics.

[16]  Maryam Saeedifard,et al.  Optimal control of modular multilevel converters for low-speed operation of motor drives , 2014, 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014.

[17]  S. Allebrod,et al.  New transformerless, scalable Modular Multilevel Converters for HVDC-transmission , 2008, 2008 IEEE Power Electronics Specialists Conference.

[18]  Makoto Hagiwara,et al.  A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter , 2010, IEEE Transactions on Power Electronics.

[19]  Maryam Saeedifard,et al.  Operation, Control, and Applications of the Modular Multilevel Converter: A Review , 2015, IEEE Transactions on Power Electronics.

[20]  Reza Iravani,et al.  Dynamic performance of a modular multilevel back-to-back HVDC system , 2010, 2011 IEEE Power and Energy Society General Meeting.

[21]  Leon M. Tolbert,et al.  A New Selective Loop Bias Mapping Phase Disposition PWM With Dynamic Voltage Balance Capability for Modular Multilevel Converter , 2014, IEEE Transactions on Industrial Electronics.

[22]  M. Pereira,et al.  SVC PLUS: An MMC STATCOM for network and grid access applications , 2011, 2011 IEEE Trondheim PowerTech.

[23]  W. Marsden.  I and J , 2012 .