基于无闭锁直流自耦变压器的LCC-HVDC与VSC-HVDC互联系统

doi:10.19595/j.cnki.1000-6753.tces.L80556

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摘要为了满足未来不同电压等级、不同类型的直流电网互联的需要,研究了一种通过无闭锁直流自耦变压器（DC AUTO）连接基于电网换向换流器的高压直流输电（LCC-HVDC）和基于电压源型换流器的高压直流输电（VSC-HVDC）的互联系统。该互联系统可以充分利用两种高压直流技术各自的优势,实现灵活的双向有功功率传输,并且可以在不闭锁任何器件的同时有效穿越直流故障。首先,提出该互联系统的拓扑并简要分析其基本优势,然后分别为VSC-HVDC、无闭锁DC AUTO、LCC-HVDC设计可行的控制策略以确保系统在正常工况和故障状态下的稳定运行,最后在PSCAD/EMTDC平台下搭建了该互联系统仿真模型,并通过仿真结果证明了该互联系统的可行性与所提控制方案的有效性。

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关键词 ：直流自耦变压器, 高压直流输电, 直流电网, 混合型MMC, 直流故障穿越

Abstract：DC-DC converters play an indispensable role in interconnecting DC systems with different voltage levels. This paper investigates the feasibility of interconnecting LCC-HVDC and VSC-HVDC through an un-interrupted DC autotransformer (DC AUTO). The interconnected system aims at taking advantage of the two HVDC technologies respectively. To begin with, the system configuration and the potential benefits are illustrated. Then, the corresponding control strategies towards LCC-HVDC, VSC-HVDC, and the un-interrupted DC AUTO are proposed to ensure the interconnected system steady operation during both normal time and faulted conditions. Finally, a 4-terminal test system is built on PSCAD/EMTDC platform to validate the technical feasibility of the interconnected system and the effectiveness of the proposed control strategy.

Key words： DC autotransformer high voltage direct current DC grid hybrid MMC DC fault ride-through

收稿日期: 2018-07-01 出版日期: 2019-02-15

PACS:

TM72

基金资助:国家电网公司科技资助项目（NYN17201600314）

通讯作者: 李梦柏男,1990年生,博士研究生,研究方向为直流-直流变压器、直流电网等。E-mail: mengbo_li@foxmail.com

作者简介: 杨之翰男,1992年生,硕士研究生,研究方向为柔性直流输电和直流电网。E-mail: yangzhihan@hust.edu.cn

引用本文:

杨之翰, 李梦柏, 向往, 林卫星, 姚良忠, 文劲宇. 基于无闭锁直流自耦变压器的LCC-HVDC与VSC-HVDC互联系统[J]. 电工技术学报, 2018, 33(zk2): 499-510. Yang Zhihan, Li Mengbo, Xiang Wang, Lin Weixing, Yao Liangzhong, Wen Jinyu. Research on the Interconnection System of VSC-HVDC and LCC-HVDC Based on Un-Interrupted DC-DC Autotransformer. Transactions of China Electrotechnical Society, 2018, 33(zk2): 499-510.

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