Title: System and method for optimizing fundamental frequency modulation for a cascaded multilevel inverter

Abstract

A system and a method for optimizing fundamental frequency modulation in a cascaded multilevel inverter (CMI) are provided. The CMI includes at least a first H-bridge module and a second H-bridge module connected in series with the first H-bridge module. The first H-bridge module is operated according to a first duty cycle and the second H-bridge module is operated according to a second duty cycle. The first duty cycle is greater than the second duty cycle. The first and second H-bridge modules are controlled utilizing fundamental frequency modulation. A portion of the first duty cycle is transferred to the second duty cycle thereby optimizing fundamental frequency modulation by at least improving power sharing between the first and second H-bridge modules and improving equalization of DC capacitor currents and voltage ripples while maintaining the same fundamental modulation to the output voltage waveform.

Inventors:

Peng, Fang Zheng; Yang, Shuitao

Issue Date:

2018-07-24

Research Org.:

Michigan State Univ., East Lansing, MI (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1464120

Patent Number(s):

10033263

Application Number:

15/188,218

Assignee:

Board of Trustees of Michigan State University (East Lansing, MI)

Patent Classifications (CPCs):

H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS

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H - ELECTRICITY H02 - GENERATION H02M - APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS

H02M7/483 - Converters with outputs that each can have more than two voltages levels
H02M1/12 - Arrangements for reducing harmonics from ac input or output
H02M2007/4835 - {comprising a plurality of cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, the capacitors being selectively connected in series to determine the instantaneous output voltage}
H02M7/49 - Combination of the output voltage waveforms of a plurality of converters

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DOE Contract Number:  

AR0000222

Resource Type:

Patent

Resource Relation:

Patent File Date: 2016 Jun 21

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING; 47 OTHER INSTRUMENTATION