A Design Method of Hybrid MMC Full-bridge Submodule Proportion Applied to DC Traction Power Supply System for Urban Rail Transit

Yanna XI; Xiaotong LI; Ziming LI; Yingdong WEI; Xiaoqian LI; Fangmin WANG; Wei LI; Weirui LI

doi:10.11930/j.issn.1004-9649.202011100

Zhongguo dianli (Apr 2022)

A Design Method of Hybrid MMC Full-bridge Submodule Proportion Applied to DC Traction Power Supply System for Urban Rail Transit

Yanna XI,
Xiaotong LI,
Ziming LI,
Yingdong WEI,
Xiaoqian LI,
Fangmin WANG,
Wei LI,
Weirui LI

Affiliations

Yanna XI: State Grid Beijing Electric Power Company, Beijing 100031, China
Xiaotong LI: State Grid Beijing Electric Power Company, Beijing 100031, China
Ziming LI: State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering, Tsinghua University), Beijing100084, China
Yingdong WEI: State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering, Tsinghua University), Beijing100084, China
Xiaoqian LI: State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering, Tsinghua University), Beijing100084, China
Fangmin WANG: State Grid Beijing Electric Power Company, Beijing 100031, China
Wei LI: State Grid Beijing Electric Power Company, Beijing 100031, China
Weirui LI: State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering, Tsinghua University), Beijing100084, China

DOI: https://doi.org/10.11930/j.issn.1004-9649.202011100
Journal volume & issue: Vol. 55, no. 4
pp. 54 – 62

Abstract

Read online

The characteristic of urban rail DC traction power supply system is low voltage and large current. The capacity of a converter fails to meet the demand, limited by the current capacity of the switching device. Hybrid modular multilevel converter (MMC) is composed of full-bridge submodule and half-bridge submodule. It can be used in systems with modulation ratio greater than one. Utilizing the negative level output capability of the full-bridge submodule, the increase of the AC voltage or the reduction of the DC voltage can be achieved. This article is aimed at the hybrid MMC that can be applied in the DC traction power supply system and proposes a design method for the proportion of full-bridge submodule. This method meets the needs of high modulation ratio steady state operation and DC fault clearing capability. A 1 500 V subway system is selected as an example and three sets of parameters are also selected. The simulation model was built in PSCAD software to verify the correctness of the design method.

Published in Zhongguo dianli

ISSN: 1004-9649 (Print)
Publisher: State Grid Energy Research Institute
Country of publisher: China
LCC subjects: Science: Physics: Electricity and magnetism: Electricity; Technology: Electrical engineering. Electronics. Nuclear engineering: Production of electric energy or power. Powerplants. Central stations
Website: http://www.electricpower.com.cn/CN/1004-9649/home.shtml

About the journal

Abstract

Keywords