Feasibility of capacitor voltage regulation and output voltage harmonic minimization in cascaded H-bridge converters

Multilevel converters have found popularity in electric-drive vehicles. In cascaded H-bridge multilevel converters, it is advantageous to use only one DC voltage source for the main H-bridge cell and supply the rest of the cells with capacitors. However, regulating the capacitors' voltage level becomes a challenging issue. This paper studies the existing constraints on regulating the capacitor voltage levels especially with respect to the elimination of the fifth and seventh harmonics. Detailed as well as simplified analyses are presented and verified. In addition, the constrained nonlinear optimization method is used to find the switching angles that regulate the capacitor voltage, eliminate the fifth harmonic, and minimize the combination of seventh and eleventh harmonics.

[1]  J. Dixon,et al.  Reactive Power Compensation Technologies: State-of-the-Art Review , 2005, Proceedings of the IEEE.

[2]  Alfred Rufer,et al.  Control of a hybrid asymmetric multilevel inverter for competitive medium-voltage industrial drives , 2003, IEEE Transactions on Industry Applications.

[3]  Xiaogang Huang,et al.  Direct-coupled multilevel cascaded series VAr compensators , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[4]  J. Chiasson,et al.  A cascade multilevel inverter using a single DC source , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[5]  Zhong Du,et al.  Elimination of harmonics in a multilevel converter with nonequal DC sources , 2005, IEEE Transactions on Industry Applications.

[6]  Thomas A. Lipo,et al.  A hybrid multilevel inverter topology for drive applications , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.

[7]  Keith Corzine,et al.  A cascaded multi-level H-bridge inverter utilizing capacitor voltages sources , 2003 .

[8]  L.G. Franquelo,et al.  The age of multilevel converters arrives , 2008, IEEE Industrial Electronics Magazine.

[9]  Keith Corzine,et al.  Control of cascaded multi-level inverters , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[10]  L.M. Tolbert,et al.  Fundamental Frequency Switching Strategies of a Seven-Level Hybrid Cascaded H-Bridge Multilevel Inverter , 2009, IEEE Transactions on Power Electronics.

[11]  Carlo Cecati,et al.  Design of H-bridge multilevel active rectifier for traction systems , 2002 .

[12]  A. Rufer,et al.  Control of a hybrid asymmetric multilevel inverter for competitive medium-voltage industrial drives , 2003, IEEE Transactions on Industry Applications.

[13]  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.

[14]  A.R. Bendre,et al.  Floating capacitor voltage regulation in diode clamped hybrid multilevel converters , 2009, 2009 IEEE Electric Ship Technologies Symposium.

[15]  J. Chiasson,et al.  A new approach to solving the harmonic elimination equations for a multilevel converter , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[16]  Leon M. Tolbert,et al.  Multilevel converters for large electric drives , 1999 .

[17]  A.R. Beig,et al.  A novel fifteen level inverter for photovoltaic power supply system , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..