Modular Multilevel Solid State Transformer of Arm Integrated Submodule With DC Short Circuit Fault Blocking Capability

被引：0
|
作者：
Yan Y. [1 ,2 ]
Sun Y. [1 ,2 ]
Guo W. [2 ]
Hou K. [1 ]
机构：
[1] State Key Laboratory of Smart Grid Protection and Control, NARI Group Corporation, Jiangsu Province, Nanjing
[2] NARI School of Electrical and Automation Engineering, Nanjing Normal University, Jiangsu Province, Nanjing
来源：
Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 03期
基金：
中国国家自然科学基金;
关键词：
arm integrated submodule (AISM); hybrid frequency modulation; modular multilevel converter solid state transformer (MMC-SST); MVDC short circuit fault uninterrupted operation;
D O I：
10.13335/j.1000-3673.pst.2022.2369
中图分类号：
学科分类号：
摘要：
The solid state transformer based on the modular multilevel converter (MMC-SST) has attracted an extensive attention in the AC / DC hybrid distribution network due to its multi-voltage levels and multi-voltage configuration ports. The traditional input series output parallel (ISOP) typed MMC-SST has a high power density, but it cannot supply power to the low voltage side continuously under the condition of a medium voltage DC (MVDC) port short circuit fault. The dual active bridge (DAB) typed MMC-SST has the problems of low power density and high cost. The traditional DAB typed MMC-SST with a half bridge structure cannot continuously supply power to the low-voltage side either in the case of an MVDC port short circuit fault. This paper proposes an arm integrated submodule (AISM) based MMC-SST topology (AISM type MMC-SST). Without changing the electrical characteristics of the MMC-SST ports, the number of switching devices is effectively reduced, and the SST has got the ability of uninterrupted operation under the condition of a short circuit on the MVDC port, thus improving the power density and power supply reliability of the SST. Meanwhile, for the proposed AISM typed MMC-SST, a hybrid frequency modulation for the MMC is proposed in the paper. Based on the common mode and differential mode decoupling principles, the decoupling of the high and low frequency modulation signals in the MMC-SST is realized. The feasibility of the proposed topology and control method is verified by theoretical analysis and simulation. © 2024 Power System Technology Press. All rights reserved.
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页码：1224 / 1234
页数：10
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