A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections

Shuxin Zhang; Binbin Li; Da Cheng; Xiaodong Zhao; Gen Li; Wei Wang; Dianguo Xu

doi:10.1109/TPEL.2020.3002536

A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections

Shuxin Zhang^*
, Binbin Li
, Da Cheng
, Xiaodong Zhao
, Gen Li
, Wei Wang
, Dianguo Xu

^*Corresponding author for this work

School of Electrical Engineering and Automation, Harbin Institute of Technology
CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd.
Cardiff University

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

With the rapid development of voltage source converter-based high-voltage direct current (HVdc) transmission, it is an irresistible trend that HVdc grid will come into being. High-voltage and high-power dc/dc converters will serve as dc transformers in HVdc grid to interconnect dc lines with different voltage ratings. This article proposes a monopolar symmetrical dc/dc converter which is composed of cascaded half-bridge submodules and series-connected insulated-gate bipolar transistors. This hybrid topology features low capital costs, high efficiency, small footprint, and bidirectional power transfer capability. Operation principle, parameter design, and the control strategies of this topology are introduced. A 480-MW, ±500 kV/±160 kV monopolar symmetrical dc/dc converter is simulated to verify its performance and evaluate the efficiency. In addition, a downscaled prototype rated at 2.4 kW, ±300 V/±100 V has been built and tested. Experimental results further validate the effectiveness of the proposed dc/dc converter.

Original language	English
Article number	9117166
Pages (from-to)	248-262
Number of pages	15
Journal	IEEE Transactions on Power Electronics
Volume	36
Issue number	1
DOIs	https://doi.org/10.1109/TPEL.2020.3002536
State	Published - Jan 2021
Externally published	Yes

Keywords

DC transformer
high-voltage direct current (HVdc) grid
hybrid topology
monopolar symmetrical dc/dc converter

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10.1109/TPEL.2020.3002536

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title = "A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections",

abstract = "With the rapid development of voltage source converter-based high-voltage direct current (HVdc) transmission, it is an irresistible trend that HVdc grid will come into being. High-voltage and high-power dc/dc converters will serve as dc transformers in HVdc grid to interconnect dc lines with different voltage ratings. This article proposes a monopolar symmetrical dc/dc converter which is composed of cascaded half-bridge submodules and series-connected insulated-gate bipolar transistors. This hybrid topology features low capital costs, high efficiency, small footprint, and bidirectional power transfer capability. Operation principle, parameter design, and the control strategies of this topology are introduced. A 480-MW, ±500 kV/±160 kV monopolar symmetrical dc/dc converter is simulated to verify its performance and evaluate the efficiency. In addition, a downscaled prototype rated at 2.4 kW, ±300 V/±100 V has been built and tested. Experimental results further validate the effectiveness of the proposed dc/dc converter.",

keywords = "DC transformer, high-voltage direct current (HVdc) grid, hybrid topology, monopolar symmetrical dc/dc converter",

author = "Shuxin Zhang and Binbin Li and Da Cheng and Xiaodong Zhao and Gen Li and Wei Wang and Dianguo Xu",

note = "Publisher Copyright: {\textcopyright} 1986-2012 IEEE.",

year = "2021",

month = jan,

doi = "10.1109/TPEL.2020.3002536",

language = "英语",

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AU - Cheng, Da

AU - Zhao, Xiaodong

AU - Li, Gen

AU - Wang, Wei

AU - Xu, Dianguo

PY - 2021/1

Y1 - 2021/1

N2 - With the rapid development of voltage source converter-based high-voltage direct current (HVdc) transmission, it is an irresistible trend that HVdc grid will come into being. High-voltage and high-power dc/dc converters will serve as dc transformers in HVdc grid to interconnect dc lines with different voltage ratings. This article proposes a monopolar symmetrical dc/dc converter which is composed of cascaded half-bridge submodules and series-connected insulated-gate bipolar transistors. This hybrid topology features low capital costs, high efficiency, small footprint, and bidirectional power transfer capability. Operation principle, parameter design, and the control strategies of this topology are introduced. A 480-MW, ±500 kV/±160 kV monopolar symmetrical dc/dc converter is simulated to verify its performance and evaluate the efficiency. In addition, a downscaled prototype rated at 2.4 kW, ±300 V/±100 V has been built and tested. Experimental results further validate the effectiveness of the proposed dc/dc converter.

AB - With the rapid development of voltage source converter-based high-voltage direct current (HVdc) transmission, it is an irresistible trend that HVdc grid will come into being. High-voltage and high-power dc/dc converters will serve as dc transformers in HVdc grid to interconnect dc lines with different voltage ratings. This article proposes a monopolar symmetrical dc/dc converter which is composed of cascaded half-bridge submodules and series-connected insulated-gate bipolar transistors. This hybrid topology features low capital costs, high efficiency, small footprint, and bidirectional power transfer capability. Operation principle, parameter design, and the control strategies of this topology are introduced. A 480-MW, ±500 kV/±160 kV monopolar symmetrical dc/dc converter is simulated to verify its performance and evaluate the efficiency. In addition, a downscaled prototype rated at 2.4 kW, ±300 V/±100 V has been built and tested. Experimental results further validate the effectiveness of the proposed dc/dc converter.

KW - DC transformer

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ER -

A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections

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Keywords

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