Topology and Modulation Strategy of DC-DC Interfacing Converter for Inter-connection Between LCC-HVDC and VSC-HVDC

LI Yan; LIU Chao; ZHU Miao; ZHU Lingzhi; CHEN Yang; CAI Xu

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Topology and Modulation Strategy of DC-DC Interfacing Converter for Inter-connection Between LCC-HVDC and VSC-HVDC

更新时间：2025-12-08

- Topology and Modulation Strategy of DC-DC Interfacing Converter for Inter-connection Between LCC-HVDC and VSC-HVDC
- Vol. 46, Issue 4, Pages: 1260-1268(2020)
- 作者机构：
  
  1. 中国电力科学研究院有限公司
  2. 上海交通大学电子信息与电气工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 April 2020，
  
  Published：2020
- 稿件说明：
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LI Yan, LIU Chao, ZHU Miao, et al. Topology and Modulation Strategy of DC-DC Interfacing Converter for Inter-connection Between LCC-HVDC and VSC-HVDC[J]. 2020, 46(4): 1260-1268.
DOI：

LI Yan, LIU Chao, ZHU Miao, et al. Topology and Modulation Strategy of DC-DC Interfacing Converter for Inter-connection Between LCC-HVDC and VSC-HVDC[J]. 2020, 46(4): 1260-1268. DOI：

摘要

为实现基于电网换相换流器的LCC-HVDC和基于电压源型换流器的VSC-HVDC之间的直流互联

提出了一种隔离型双MMC结构的互联DC-DC接口及其调制策略。为满足LCC-HVDC与VSC-HVDC在电压等级和工作原理等方面的差异性需求

互联接口在LCC侧采用全桥MMC结构

在VSC侧采用半桥MMC结构

两侧MMC之间通过中频变压器进行功率交换。针对该接口的应用场景

提出了准两电平调制策略及其子模块均压控制策略。接口工作过程分析表明

所提出的调制策略能够稳定传输功率

减小子模块承受的电压应力。对子模块能量交互过程分析表明

所提出子模块均压策略能够合理设置子模块移相角

有效维持子模块电容电压均衡稳定。同时给出仿真与实验结果

证明了所提出的接口及其调制策略的有效性与正确性。

Abstract

An isolated dual MMC DC-DC interfacing converter and its modulation strategy are proposed for the inter-connection of Line Commutated Converter HVDC（LCC-HVDC） and Voltage Source Converter HVDC（VSC-HVDC）. Full bridge MMC is applied in LCC side and half bridge MMC in VSC side for the different characteristics and demands of LCC-HVDC and VSC-HVDC. The two converters are connected via an intermediate-frequency transformer. A quasi two-level modulation method and its submodule voltage balancing strategy are presented to meet the proposed scenario. According to the analysis of the converter working process

stable power transmission and low submodule voltage pressure can be achieved. According to the submodule energy exchanging analysis

submodule capacitor voltages maintain stable by reasonably setting the phase-shifting angle of submodule with proposed voltage balancing strategy. Simulation and experiment results verify the effectiveness of proposed topology and modulation strategy.

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