Design and experiment of a back-to-back (BTB) system using modular multilevel cascade converters for power distribution systems

This paper presents an application of the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC) to a back-to-back (BTB) system for installation on 6.6-kV power distribution systems. The DSCC is characterized by a cascade connection of multiple chopper-cells per leg, leading to flexible circuit design, low voltage steps, low EMI emission, and low harmonic voltage and current. The DSCC-based BTB system is equipped with neither dc capacitor nor voltage sensor on the common dc link. The paper designs, constructs, and tests a three-phase, 200-V, and 10-kW downscaled system to verify and justify its operating principles and performance. Experimental and simulated results agree well with each other, showing a promising possibility of the DSCC-based BTB system.

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

[2]  Steven Liu,et al.  Integrated current control, energy control and energy balancing of Modular Multilevel Converters , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

[3]  H. Akagi,et al.  A Bidirectional Isolated DC–DC Converter as a Core Circuit of the Next-Generation Medium-Voltage Power Conversion System , 2007, IEEE Transactions on Power Electronics.

[4]  Hirofumi Akagi,et al.  Classification, Terminology, and Application of the Modular Multilevel Cascade Converter (MMCC) , 2010, IEEE Transactions on Power Electronics.

[5]  H. Akagi,et al.  Modeling and Analysis of Switching-Ripple Voltage on the DC Link Between a Diode Rectifier and a Modular Multilevel Cascade Inverter (MMCI) , 2013, IEEE Transactions on Power Electronics.

[6]  Hans-Joachim Knaak,et al.  Modular multilevel converters and HVDC/FACTS: A success story , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

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

[8]  R.W. De Doncker,et al.  A novel DC-link voltage control of PWM-switched cascade cell multi-level inverter applied to STATCOM , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

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

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

[11]  D. Retzmann,et al.  Prospects of multilevel VSC technologies for power transmission , 2008, 2008 IEEE/PES Transmission and Distribution Conference and Exposition.

[12]  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.

[13]  Hirofumi Akagi,et al.  Analysis and design of a DC voltage-controlled static VAr compensator using quad-series voltage-source inverters , 1996 .

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

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

[16]  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.

[17]  N. Okada,et al.  Development of a 6.6 kV - 1 MVA Transformerless Loop Balance Controller , 2007, 2007 IEEE Power Electronics Specialists Conference.