Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications

Jianguo Li; Xianghong Zuo; Yuming Zhao; Xiuping Lv; Jiuhe Wang

doi:10.17775/CSEEJPES.2017.00630

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Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications

Regular Papers | 更新时间：2025-12-18

- Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications
- Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications
- 中国电机工程学会电力与能源系统学报(英文) 2019年5卷第1期页码：87-99
- 作者机构：
  
  1. Beijing Information Science and Technology University,, CN,Beijing
  2. Beijing Electric Power Economic Research Institute,Beijing,China,100055
  3. Shenzhen Power Supply Company,Shenzhen,China,518048
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2017.00630
  中图分类号：
- 纸质出版：2019
- 稿件说明：
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Jianguo Li, Xianghong Zuo, Yuming Zhao, 等. Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications[J]. 中国电机工程学会电力与能源系统学报(英文), 2019,5(1):87-99.

Jianguo Li, Xianghong Zuo, Yuming Zhao, et al. Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications[J]. CSEE Journal of Power and Energy Systems, 2019, 5(1): 87-99.
Jianguo Li, Xianghong Zuo, Yuming Zhao, 等. Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications[J]. 中国电机工程学会电力与能源系统学报(英文), 2019,5(1):87-99. DOI： 10.17775/CSEEJPES.2017.00630.

Jianguo Li, Xianghong Zuo, Yuming Zhao, et al. Operation, analysis and experiments of DC transformers based on modular multilevel converters for HVDC applications[J]. CSEE Journal of Power and Energy Systems, 2019, 5(1): 87-99. DOI： 10.17775/CSEEJPES.2017.00630.

摘要

Abstract

This paper studies the operation

analysis and experiments of multilevel high frequency link transformers (MHFLT) based on modular multilevel converters (MMC) for high voltage DC applications. The multilevel dual active phase shift is proposed to operate the MHFLT using a high switching frequency

which brings about many advantages and makes the operation quite different from that of the traditional DC transformer (DCT) based on a dual active bridge and the fundamental frequency MMC widely used in flexible HVDC transmission. Specifically

MHFLT is suitable for high voltage levels

which is due to its good switching characterization

ability to cut itself off from an external fault

and it can also achieve redundancy operations when a sub-module fault occurs. In this paper

the operation

modulation method

multilevel high frequency link voltage

current

and power characterization

high frequency commutation

and switching characterization are analyzed comprehensively; the pulse rotation and distributed delay control

and fault handling strategies of MHFLT are then proposed. Finally

a prototype is built

and the experimental results verify the correctness and effectiveness of the proposed solution.

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