一种混合模块型直流变压器冗余设计及控制策略

doi:10.19595/j.cnki.1000-6753.tces.L90128

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摘要针对移相-谐振双有源桥（PS-SRDAB）混合型直流变压器（DCT）,该文提出一种热备用冗余设计及其控制策略。为提高该类DCT内部谐振双有源桥（SRDAB）单元运行可靠性,将所备用的移相双有源桥（PSDAB）与其并联连接。在正常运行时,SRDAB与备用PSDAB单元同时工作,并通过控制高压侧电容电压实现两类模块内部传输能量配比。若SRDAB出现如过电流、过电压、过温等故障,对其进行闭锁后热备用PSDAB将承担模块全部功率。该文分析采用冗余设计时混合模块化直流变压器（HMDCT）的工作原理及运行特性,建立系统动态小信号模型,同时研究在采用传统电压闭环控制策略时的运行稳定性。利用所搭建的实验原理样机验证了所提出的冗余设计及控制策略的有效性。

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关键词 ：直流变压器, 冗余设计, 热备用, 混合移相-谐振双有源桥

Abstract：This paper proposes a hot standby redundant design and its control strategy for the hybrid phase-shifted and series resonant dual active bridge (PS-SRDAB) type dc transformer (DCT). To improve the reliability of the series resonant dual active bridge (SRDAB) of the DCT, a standby PSDAB power module is connected in parallel with it. In normal operation, the SRDAB and the standby phase-shifted dual active bridge (PSDAB) are operated simultaneously, and the transferred power ratio of the PSDABs and SRDABs is realized by controlling capacitor voltage on the high-voltage side. If the SRDAB has faults such as over-current, over-voltage, over-temperature and so on, the whole power is transferred by the PSDAB after the fault SRDAB is blocked. This paper analyzes the operation principle and characteristics of the hybrid modular DCT (HMDCT), establishes an average dynamic small signal model, and illustrates the operating stability with a traditional voltage closed-loop control strategy. The proposed redundant design method and its control strategy are verified by a experimental prototype.

Key words： DC transformer redundant design hot backup hybrid phase-shifted and series resonant dual active bridge (PS-SRDAB)

收稿日期: 2020-06-30

PACS:

TM41

基金资助:国家自然科学基金项目（51707184）和中国科学院青年创新促进会（2019144）资助

通讯作者: 高范强男,1968年生,博士,硕士生导师,研究方向为电力电子变压器、大功率电力电子变换器。E-mail: gaofanqiang@mail.iee.ac.cn

作者简介: 张航男,1991年生,博士,助理研究员,研究方向为大功率电力电子变换器。E-mail: zhanghang215@mail.iee.ac.cn

引用本文:

张航, 李子欣, 高范强, 赵聪, 徐飞. 一种混合模块型直流变压器冗余设计及控制策略[J]. 电工技术学报, 2022, 37(2): 409-423. Zhang Hang, Li Zixin, Gao Fanqiang, Zhao Cong, Xu Fei. A Redundant Design and Control Strategy of Hybrid Modular DC Transformer. Transactions of China Electrotechnical Society, 2022, 37(2): 409-423.

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