Capacitor Voltage Balancing of a Five-Level ANPC Converter Using Phase-Shifted PWM

Five-level active neutral-point clamped (5L-ANPC) converter is an attractive topology for high-power medium-voltage motor drives. This paper presents a capacitor voltage-balancing method for the 5L-ANPC converter, including the voltage balancing of dc-link capacitors and flying capacitors. In order to ensure that the series-connected or high-voltage switches of the 5L-ANPC converter are operated at fundamental frequency and the other switches are operated at a constant switching frequency, phase-shifted pulse width modulation is used to control this converter. The relationship between the average neutral-point current and zero-sequence voltage is investigated, and an optimum zero-sequence voltage is calculated to regulate the neutral-point potential. The voltage across the flying capacitor is also regulated by adjusting the switching duty cycles of two PWM signals, which varies the operation time of redundant switching states in each switching period. Simulation and experimental results are presented to verify the validity of this method.

[1]  B. Reznikov,et al.  Five-level single-leg flying capacitor converter voltage balance dynamics analysis , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[2]  J. Peralta,et al.  Detailed and Averaged Models for a 401-Level MMC–HVDC System , 2012, IEEE Transactions on Power Delivery.

[3]  Baoming Ge,et al.  Medium-Voltage Multilevel Converters—State of the Art, Challenges, and Requirements in Industrial Applications , 2010, IEEE Transactions on Industrial Electronics.

[4]  Zheng Xu,et al.  Modeling and Control of a Modular Multilevel Converter-Based HVDC System Under Unbalanced Grid Conditions , 2012, IEEE Transactions on Power Electronics.

[5]  P. Steimer,et al.  Active-neutral-point-clamped (ANPC) multilevel converter technology , 2005, 2005 European Conference on Power Electronics and Applications.

[6]  Ping Wang,et al.  An Improved Pulse Width Modulation Method for Chopper-Cell-Based Modular Multilevel Converters , 2012, IEEE Transactions on Power Electronics.

[7]  Jun Liang,et al.  Modified Phase-Shifted PWM Control for Flying Capacitor Multilevel Converters , 2007, IEEE Transactions on Power Electronics.

[8]  Jun Li,et al.  Analysis and Design of Active NPC (ANPC) Inverters for Fault-Tolerant Operation of High-Power Electrical Drives , 2012, IEEE Transactions on Power Electronics.

[9]  J.W. Kolar,et al.  Five-level virtual-flux direct power control for the active neutral-point clamped multilevel inverter , 2008, 2008 IEEE Power Electronics Specialists Conference.

[10]  Wenjing Liu,et al.  Accelerated Model of Modular Multilevel Converters in PSCAD/EMTDC , 2013, IEEE Transactions on Power Delivery.

[11]  Fang Zheng Peng,et al.  Multilevel inverters: a survey of topologies, controls, and applications , 2002, IEEE Trans. Ind. Electron..

[12]  R. Marquardt.  A new modular voltage source inverter topology , 2003 .

[13]  J. Melkebeek,et al.  Improved Natural Balancing With Modified Phase-Shifted PWM for Single-Leg Five-Level Flying-Capacitor Converters , 2012, IEEE Transactions on Power Electronics.

[14]  Yongdong Li,et al.  Analysis and Calculation of Zero-Sequence Voltage Considering Neutral-Point Potential Balancing in Three-Level NPC Converters , 2010, IEEE Transactions on Industrial Electronics.

[15]  Vassilios G. Agelidis,et al.  Hybrid Flying-Capacitor-Based Active-Neutral-Point-Clamped Five-Level Converter Operated With SHE-PWM , 2011, IEEE Transactions on Industrial Electronics.

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

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

[18]  S. R. Pulikanti,et al.  Control of neutral point and flying capacitor voltages in five-level SHE-PWM controlled ANPC converter , 2009, 2009 4th IEEE Conference on Industrial Electronics and Applications.

[19]  Gonzalo Abad,et al.  Medium Voltage–High Power Converter Topologies Comparison Procedure, for a 6.6 kV Drive Application Using 4.5 kV IGBT Modules , 2012, IEEE Transactions on Industrial Electronics.

[20]  Georgios Konstantinou,et al.  Generalisation of flying capacitor-based active-neutralpoint- clamped multilevel converter using voltage-level modulation , 2012 .

[21]  Hirofumi Akagi.  Classification, Terminology, and Application of the Modular Multilevel Cascade Converter (MMCC) , 2011 .

[22]  F. Kieferndorf,et al.  A new medium voltage drive system based on ANPC-5L technology , 2010, 2010 IEEE International Conference on Industrial Technology.

[23]  Mariusz Malinowski,et al.  A Survey on Cascaded Multilevel Inverters , 2010, IEEE Transactions on Industrial Electronics.

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

[25]  Fang Z. Peng,et al.  Recent advances in multilevel converter/inverter topologies and applications , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[26]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[27]  José R. Rodríguez,et al.  A Survey on Neutral-Point-Clamped Inverters , 2010, IEEE Transactions on Industrial Electronics.

[28]  D.G. Holmes,et al.  Natural Capacitor Voltage Balancing for a Flying Capacitor Converter Induction Motor Drive , 2009, IEEE Transactions on Power Electronics.

[29]  Kui Wang,et al.  Neutral-Point Potential Balancing of a Five-Level Active Neutral-Point-Clamped Inverter , 2013, IEEE Transactions on Industrial Electronics.