Auxiliary Strategy for DC Fault Clearing of Low Capacitance Half-Bridge Modular Multilevel Converter

被引：0
作者：
Fan Q. [1 ]
Yu Y. [2 ]
Xia J. [1 ]
Zhao C. [1 ]
Xu J. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
[2] State Grid Zhejiang Hangzhou Qiantang New District Power Supply Company, Hangzhou
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2022年 / 37卷 / 14期
关键词：
Current injection; DC fault clearing strategy; equivalent charge; experimental verification; fast recovery; low capacitance half-bridge MMC;
D O I：
10.19595/j.cnki.1000-6753.tces.211233
中图分类号：
学科分类号：
摘要：
The current injection method can reduce the capacitance value of bridge arm sub modules (SMs), thereby reducing the volume and weight of MMC, and realizing the lightweight of MMC. Based on the theoretical analysis of the characteristics of low capacitance MMC in DC fault conditions, it is pointed out that the discharge speed of SM sunder low capacitance is fast when other parameters remain unchanged, which may lead to low voltage blocking of SMs during the DC fault clearing process. From the perspective of equivalent charge, a DC fault clearing strategy based on low capacitance half bridge MMC is proposed. By adjusting the total number of SMs in each phase according to the capacitance reduction ratio in MMC during the fault clearing process, the discharge capacity of the SM capacitors can be effectively reduced and the system recovery can be accelerated. A simulation program is built in PSCAD/EMTDC simulation environment, and the effectiveness of auxiliary strategy for DC fault clearing in low capacitance MMC is verified. © 2022 Chinese Machine Press. All rights reserved.
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页码：3713 / 3722
页数：9
相关论文
共 19 条
  • [1] Lesnicar A, Marquardt R, An innovative modular multilevel converter topology suitable for a wide power range, 2003 IEEE Bologna Power Tech Conference Proceedings, (2003)
  • [2] Xu Dianguo, Liu Yuchao, Wu Jian, Review on control strategies of multi-terminal direct current transmission system, Transactions of China Electrotechnical Society, 30, 17, pp. 1-12, (2015)
  • [3] Tan Xiangyu, Ren Li, Tang Yuejin, Et al., Study on the current-limiting characteristics of saturated iron core superconducting fault current limiter in MMC-HVDC system, Transactions of China Electrotechnical Society, 35, S2, pp. 556-561, (2020)
  • [4] Meng Peiyu, Wang Zhibing, Chi Yongning, Et al., Control strategy of hybrid four-terminal HVDC transmission system dedicated for long-distance power delivery from multiple energy bases, Transactions of China Electrotechnical Society, 35, S2, pp. 523-534, (2020)
  • [5] Li Ying, Hu Jiaxin, Influence of the two Sessions' spirits of “peak carbon dioxide emissions and carbon neutrality” on power industry development in China, Popular Utilization of Electricity, 36, 3, pp. 10-11, (2021)
  • [6] Xu Jianzhong, Li Yu, Lu Feng, Et al., A review of suppression methods for sub-module capacitor voltage ripple amplitudes in modular multilevel converters, Proceedings of the CSEE, 39, 2, pp. 571-584, (2019)
  • [7] Li Kai, Zhao Zhengming, Yuan Liqiang, Et al., Controlstrategy based on the energy balance for reducing submodule capacitor voltage fluctuation of modular multilevel converter, Transactions of China Electrotechnical Society, 32, 14, pp. 17-26, (2017)
  • [8] Tu Qingrui, Xu Zheng, Guan Minyuan, Et al., Design of circulating current suppressing controllers for modular multilevel converter, Automation of Electric Power Systems, 34, 18, pp. 57-61, (2010)
  • [9] Engel S P, De Doncker R W., Control of the modular multi-level converter for minimized cell capacitance, Proceedings of 14th European Conference on Power Electronics and Applications, pp. 1-10, (2011)
  • [10] Vasiladiotis M, Cherix N, Rufer A., Accurate capacitor voltage ripple estimation and current control considerations for grid-connected modular multilevel converters, IEEE Transactions on Power Electronics, 29, 9, pp. 4568-4579, (2014)
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