Control Strategies of a Hybrid Multilevel Converter for Expanding Adjustable Output Voltage Range

This paper proposes a new arrangement and new control strategies for a hybrid multilevel converter, aiming at a high-power high-efficiency converter system being free from harmonic distortion. The strategies enable one to expand the adjustable output voltage range up to 100% by keeping a very low harmonic distortion of the output voltage. The triangular-carrier-based pulsewidth modulation (PWM) and space-vector-based PWM strategies are applied to voltage control. The effectiveness is verified by simulation and experimental results. The proposed hybrid multilevel converter is applicable to medium-voltage networks as a high-power grid-interface converter.

[1]  M. Marchesoni,et al.  A non conventional power converter for plasma stabilization , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.

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

[3]  Shoji Fukuda,et al.  Control strategy for a three phase series-connected hybrid inverter system , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[4]  D. J. Adams,et al.  A power line conditioner using cascade multilevel inverters for distribution systems , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[5]  S. Fukuda,et al.  A Hybrid Multilevel Converter System with Extended Adjustable Output Voltage Range , 2007, 2007 IEEE Power Electronics Specialists Conference.

[6]  N. S. Choi,et al.  A general circuit topology of multilevel inverter , 1991, PESC '91 Record 22nd Annual IEEE Power Electronics Specialists Conference.

[7]  Thomas A. Lipo,et al.  Comparison of multilevel inverters for static VAr compensation , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[8]  Akira Sagawa,et al.  Optimal-regulator-based control of NPC boost rectifiers for unity power factor and reduced neutral-point-potential variations , 1999, IEEE Trans. Ind. Electron..

[9]  S. Fukuda,et al.  Optimal regulator based control of NPC boost rectifiers for unity power factor and reduced neutral point potential variations , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[10]  Jorge Pontt,et al.  "Novel 20 MW downhill conveyor system using three-level converters" , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[11]  J. Rodriguez,et al.  High voltage multilevel converter with regeneration capability , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

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

[13]  W. Leonhard,et al.  Power Electronics and Control by Microelectronics in Future Energy Systems , 1999 .

[14]  Fang Zheng Peng,et al.  A multilevel voltage-source inverter with separate DC sources for static VAr generation , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[15]  Laszlo Gyugyi,et al.  AEP unified power flow controller performance , 1999 .

[16]  Kenichi Suzuki,et al.  Development of self-commutated SVC for power system , 1993 .

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

[18]  S. Fukuda,et al.  Introduction of a series-connected hybrid multi-converter system , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[19]  E. Kraft.  Three-level high-power inverters with IGCT and IGBT elements compared on the basic of measurements of the device loss , 1999 .

[20]  Timothy C. Green,et al.  Control and filter design of three-phase inverters for high power quality grid connection , 2003 .

[21]  Fumitoshi Ichikawa,et al.  Develppment of Self-Commutated SVC for Power System , 1993 .

[22]  R.W. De Doncker.  Medium-voltage power electronic technologies for future decentralized power systems , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).

[23]  S. Fukuda,et al.  A Hybrid Multi Converter System Having Full Adjustable Output Voltage Range , 2007, 2007 Power Conversion Conference - Nagoya.

[24]  Pablo Lezana,et al.  High-voltage multilevel converter with regeneration capability , 2002, IEEE Trans. Ind. Electron..

[25]  T.A. Meynard,et al.  Multi-level conversion: high voltage choppers and voltage-source inverters , 1992, PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference.

[26]  Thomas A. Lipo,et al.  A generalized structure of multilevel power converter , 1998, 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings..

[27]  Thomas A. Lipo,et al.  Hybrid multilevel power conversion system: a competitive solution for high power applications , 1999 .

[28]  Fang Zheng Peng,et al.  Multilevel converters-a new breed of power converters , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[29]  P. W. Hammond,et al.  A new approach to enhance power quality for medium voltage AC drives , 1997 .

[30]  T. W. Cease,et al.  Development of a /spl plusmn/100 MVAr static condenser for voltage control of transmission systems , 1995 .