Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters

A modular multilevel converter (MMC) is one of the next-generation multilevel converters intended for high- or medium-voltage power conversion without transformers. The MMC is based on cascade connection of multiple bidirectional chopper-cells per leg, thus requiring voltage-balancing control of the multiple floating DC capacitors. However, no paper has made an explicit discussion on voltage-balancing control with theoretical and experimental verifications. This paper deals with two types of pulsewidth-modulated modular multilevel converters (PWM- MMCs) with focus on their circuit configurations and voltage-balancing control. Combination of averaging and balancing controls enables the PWM-MMCs to achieve voltage balancing without any external circuit. The viability of the PWM-MMCs, as well as the effectiveness of the voltage-balancing control, is confirmed by simulation and experiment.

[1]  Thierry Meynard,et al.  Multi-Level Choppers for High Voltage Applications , 1992 .

[2]  Fang Zheng Peng,et al.  A generalized multilevel inverter topology with self voltage balancing , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

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

[4]  Tetsuo Uzuka,et al.  A static voltage fluctuation compensator for AC electric railway , 2004, PESC 2004.

[5]  Naotaka Iio,et al.  Electronic Frequency Converter , 2010 .

[6]  H. Akagi,et al.  A Transformerless Energy Storage System Based on a Cascade Multilevel PWM Converter With Star Configuration , 2008, IEEE Transactions on Industry Applications.

[7]  H. Akagi,et al.  Calculation of DC Magnetic Flux Deviation in the Converter-Transformer of a Self-Commutated BTB System During Single-Line-to-Ground Faults , 2008, IEEE Transactions on Power Electronics.

[8]  Thierry Meynard,et al.  Multicell converters: basic concepts and industry applications , 2002, IEEE Trans. Ind. Electron..

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

[10]  M. Glinka,et al.  Prototype of multiphase modular-multilevel-converter with 2 MW power rating and 17-level-output-voltage , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[11]  H. Akagi,et al.  A transformerless battery energy storage system based on a multilevel cascade PWM converter , 2008, 2008 IEEE Power Electronics Specialists Conference.

[12]  Midori Otsuki,et al.  Electronic frequency converter feeding single-phase circuit for Shinkansen , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

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

[14]  Fujio Ishiguro,et al.  Development of a large static VAr generator using self-commutated inverters for improving power system stability , 1991 .

[15]  Rainer Marquardt,et al.  A New Single Phase AC/AC-Multilevel Converter for Traction Vehicles Operating On Ac Line Voltage , 2004 .

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

[17]  Hirofumi Akagi,et al.  Large static converters for industry and utility applications , 2001, Proc. IEEE.

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

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

[20]  Rainer Marquardt,et al.  A new AC/AC multilevel converter family , 2005, IEEE Transactions on Industrial Electronics.

[21]  Hirofumi Akagi,et al.  A 6.6-kV transformerless STATCOM based on a five-level diode-clamped PWM converter: system design and experimentation of a 200-V, 10-kVA laboratory model , 2005 .

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