A minimized AC circulating control strategy for a non-isolated modular multilevel DC/DC converter

被引：0

作者：

Ma W. ^{[1
]}

Tian H. ^{[1
]}

Liu H. ^{[1
]}

Hu F. ^{[1
]}

Li M. ^{[1
]}

Zhang K. ^{[2
]}

机构：

[1] Institute of New Energy, China University of Petroleum (East China), Qingdao

[2] Shandong Energy Group Co., Ltd., Jining

来源：

Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2021年 / 49卷 / 22期

基金：

中国国家自然科学基金;

关键词：

DC grid; DC transformer; Energy internet; Modular multilevel DC/DC converter;

D O I：

10.19783/j.cnki.pspc.210130

中图分类号：

学科分类号：

摘要：

Intermediate AC transformers are commonly used in high voltage high power DC transformers which are used for medium and high voltage DC conversion and interconnection of DC power grids. These bring greater loss and volume. In this paper, a non-isolated multilevel modular DC/DC converter is studied. The converter avoids the need for an AC transformer compared with the common dual active bridge DC/DC converter. This paper first analyzes the working principle of this converter and establishes an equivalent mathematical model. Because of the special imbalance of the sub-module capacitor voltage, the converter needs to introduce an AC circulating current. A minimized AC circulating control strategy is proposed, which ensures the power balance of the bridge arm, reduces the AC component of the bridge arm current and the loss of the converter. The performance of the converter and the effectiveness of the proposed control strategy are verified in a Matlab/Simulink simulation. Finally, an experimental platform is built to verify the effectiveness of the converter topology and the control strategy. © 2021 Power System Protection and Control Press.

引用

页码：51 / 58

页数：7

共 29 条

[1] YANG Xiaofeng, ZHENG T Q, LIN Zhiqin, Et al., Survey of high-Power DC/DC converter for HVDC grid application, Power System Technology, 40, 3, pp. 670-677, (2016)
[2] YANG Bo, ZHUANG Jun, YAO Yunchang, Et al., A dual reverse blocking sub-module based MMC with DC fault current blocking capability, Power System Protection and Control, 47, 24, pp. 39-46, (2019)
[3] JIAO Ruihao, DING Jian, REN Jianwen, Et al., Future new DC power grids for large-scale clean energy integration and transmission, Smart Power, 47, 6, pp. 9-18, (2019)
[4] SUO Zhiwen, LI Gengyin, CHI Yongning, Et al., Multi-port DC substation for offshore wind farm integration and its master-slave control, Automation of Electric Power Systems, 39, 11, pp. 16-23, (2015)
[5] ALASSI A, BANALES S, ELLABBAN O, Et al., HVDC transmission: technology review, market trends and future outlook, Renewable and Sustainable Energy Reviews, 112, pp. 530-554, (2019)
[6] GUAN M., A series-connected offshore wind farm based on modular dual-active-bridge (DAB) isolated DC-DC converter, IEEE Transactions on Energy Conversion, 34, 3, pp. 1422-1431, (2019)
[7] WANG Xinying, TANG Guangfu, HE Zhiyuan, Et al., Topology research of DC/DC converters for offshore wind farm DC collection systems, Proceedings of the CSEE, 37, 3, pp. 837-848, (2017)
[8] SONG Guobing, HOU Junjie, GUO Bing, Et al., Pilot protection of hybrid MMC DC grid based on active detection, Protection and Control of Modern Power Systems, 5, 1, pp. 82-96, (2020)
[9] ZHOU Baorong, LI Xuanping, YANG Jian, Et al., Analysis of steady operation region of MMC-HVDC connected to passive network, Smart Power, 48, 6, pp. 98-104, (2020)
[10] TODORCEVIC T, BAUER P, FERREIRA J A, Et al., A modulation strategy for wide voltage output in DAB-based DC-DC modular multilevel converter for DEAP wave energy conversion, IEEE Journal of Emerging and Selected Topics in Power Electronics, 3, 4, pp. 1171-1181, (2015)

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