Loss calculation method of modular multilevel HVDC converters

Author

Yang, Liu ; Zhao, Chengyong ; Yang, Xiaodong

Author_Institution

State Key Lab. of New Energy Power Syst., North China Electr. Power Univ., Beijing, China

fYear

2011

fDate

3-5 Oct. 2011

Firstpage

97

Lastpage

101

Abstract

The modular multilevel converter (MMC) is a novel voltage source converter (VSC) topology with great potential for high voltage direct current (HVDC) transmission applications. The MMC-based HVDC system has main characteristics of flexible controlled and low switching frequency so that its losses are smaller than that of the two-level VSC-based HVDC (VSC-HVDC) system. In this paper, the operating characteristics of MMC and its losses are analyzed, and a method is presented to calculate the on-state losses according to the different on-state current of upper and lower leg. Furthermore, after the impact of junction temperature coefficient in IGBT module, a method using curve fitting to calculate the switching losses of MMC is considered. Finally, the losses of MMC are calculated in MATLAB, and the corresponding loss reducing measures are obtained from the results which also show that the method proposed is reasonable and feasible.

Keywords

HVDC power convertors; HVDC power transmission; curve fitting; insulated gate bipolar transistors; 2011 high voltage direct current transmission applications; IGBT module; MATLAB; curve fitting; junction temperature coefficient; loss calculation method; low switching frequency; modular multilevel HVDC converters; on-state current; on-state losses; voltage source converter topology; HVDC transmission; Insulated gate bipolar transistors; Power conversion; Propagation losses; Switching loss; MMC (modular multilevel converter); VSC-HVDC (Voltage Source Converter-High Voltage Direct Current); calculation method; converter losses;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Power and Energy Conference (EPEC), 2011 IEEE

Conference_Location

Winnipeg, MB

Print_ISBN

978-1-4577-0405-5

Type

conf

DOI

10.1109/EPEC.2011.6070261

Filename

6070261