Modular Multilevel DC Transformer for DC Distribution Application Based on Extended Phase-Shift Control

被引：0
|
作者：
Guan Z. [1 ]
Mei J. [1 ]
Ding R. [1 ]
Ge R. [1 ]
Fan G. [1 ]
机构：
[1] School of Electrical Engineering, Southeast University, Nanjing
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2019年 / 34卷 / 13期
关键词：
Backflow power; DC transformer; Extended phase-shift; Modular multilevel converter; Optimized working area;
D O I：
10.19595/j.cnki.1000-6753.tces.L80295
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
This paper analyzes the topology and operation characteristics of MMC-H bridge DC transformer based on modular multilevel converter (MMC) arm and H-bridge, where the MMC adopts staircase modulation and the H-bridge adopts an extended phase shift modulation with an added phase shift. Besides, this paper deduces the expression of the voltage and current of the AC chain in the DC transformer. The expression of transmission power and algorithm of backflow power are deduced, and the distribution of power variation with parameters is analyzed. The factors that affect the backflow power are summarized, and the optimized voltage regulation ratio is discussed. Zero-backflow-power boundary conditions and backflow power optimized working area are condensed. In order to suppress the backflow power, this paper proposes a backflow power optimized strategy that DC transformer works in the optimized working area by adjusting of the inner/outer phase-shift, which reduces the backflow power and current stress. Finally, a physical prototype is built to verify the optimized strategy by experimental results. © 2019, Electrical Technology Press Co. Ltd. All right reserved.
引用
收藏
页码：2770 / 2781
页数：11
相关论文
共 15 条
  • [1] Zheng H., Jiang D., Du Y., Economic comparison of AC and DC distribution system, Power System Technology, 37, 12, pp. 3368-3374, (2013)
  • [2] Zhou F., Huang W., Study on the key technology of DC distribution power network, Power System Protection and Control, 42, 22, pp. 62-67, (2014)
  • [3] Wang Z., Wang T., Zhang J., Research on modular multilevel DC transformer, Proceedings of the CSEE, 36, 1, pp. 31-39, (2016)
  • [4] Wang C., Sha G., Wang J., Et al., The analysis of zero voltage switching dual active bridge DC-DC converters based on dual phase shifting control, Transactions of China Electrotechnical Society, 30, 12, pp. 106-113, (2015)
  • [5] Wu J., Meng D., Shen Y., Et al., Optimal control strategy of dual active bridge DC-DC converter with combined dual-phase-shift and traditional-phase-shift controls, Transactions of China Electrotechnical Society, 31, 19, pp. 97-105, (2016)
  • [6] Zhao B., Yu Q., Sun W., Extended-phase-shift control of isolated bidirectional DC-DC converter for power distribution in microgrid, IEEE Transactions on Power Electronics, 27, 11, pp. 4667-4680, (2012)
  • [7] Cheng H., Gao Q., Zhu J., Et al., Dynamic modeling and minimum backflow power controlling of the bi-directional full-bridge DC-DC converters based on dual-phase-shifting control, Transactions of China Electrotechnical Society, 29, 3, pp. 245-253, (2014)
  • [8] Zhang X., Wang G., Wang T., Et al., Optimized control based on current-stress of bi-directional full-bridge DC-DC converters with dual-phase-shifting control, Transactions of China Electrotechnical Society, 31, 22, pp. 100-106, (2016)
  • [9] Wu K., De Silva C.W., Dunford W.G., Stability analysis of isolated bidirectional dual active full-bridge DC-DC converter with triple phase-shift control, IEEE Transactions on Power Electronics, 27, 4, pp. 2007-2017, (2012)
  • [10] Zhou H., Khambadkone A.M., Hybrid modulation for dual-active-bridge bidirectional converter with extended power range for ultracapacitor application, IEEE Transactions on Industry Applications, 45, 4, pp. 1434-1442, (2008)
12