Analysis and Suppression of Unbalanced Voltage in Radiant Bipolar DC Distribution Network

被引：0
|
作者：
Liao J. [1 ]
Zhou N. [1 ]
Wang Q. [1 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 18期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Bipolar; DC distribution network; Load switching; Radiant; Voltage unbalance;
D O I：
10.13334/j.0258-8013.pcsee.182086
中图分类号：
学科分类号：
摘要：
The difference between positive and negative pole voltages in the bipolar DC distribution network will cause unbalanced current in the middle line, which will increase the network power losses and lead to further deviation of the rated bus voltage. In this paper, based on the characteristics of constant-resistive and constant-power load and combined with the network constraint equation, the relationship between the unbalanced power and the neutral current, voltage unbalance factor and positive and negative pole voltages was derived. Moreover, the influence of source, network and load on DC voltage unbalance was further analyzed. On this basis, the unbalanced current interaction characteristic of upstream and downstream nodes was studied. The unbalance current can be reduced by adjusting the polarity of upstream node, which is based on load polarity switching method. Besides, the topology and implementation process of load polarity switching method was presented. Finally, the simulation platform of radial bipolar DC distribution network was built in MATLAB/Simulink, which verified the effectiveness of the DC voltage unbalance analysis method and the inhibition strategy. © 2019 Chin. Soc. for Elec. Eng.
引用
收藏
页码：5380 / 5388
页数：8
相关论文
共 18 条
  • [1] van der Blij N.H., Ramirez-Elizondo L.M., Spaan M.T.J., Et al., A state-space approach to modelling DC distribution systems, IEEE Transactions on Power Systems, 33, 1, pp. 943-950, (2018)
  • [2] Song Q., Zhao B., Liu W., Et al., An overview of research on smart DC distribution power network, Proceedings of the CSEE, 33, 25, pp. 9-19, (2013)
  • [3] Chen P., Xiao X., Tao S., Discussion on power quality problems for DC microgrid, Automation of Electric Power Systems, 40, 10, pp. 148-158, (2016)
  • [4] Li X., Guo L., Wang C., Et al., Key technologies of DC microgrids: an overview, Proceedings of the CSEE, 36, 1, pp. 2-17, (2016)
  • [5] Ma Z., Jiao Z., Li R., Et al., Network structures and key technologies of DC distribution systems, Power System Technology, 41, 10, pp. 3348-3357, (2017)
  • [6] Wang M.H., Mok K.T., Tan S.C., Et al., Multifunctional DC electric springs for improving voltage quality of DC grids, IEEE Transactions on Smart Grid, 9, 3, pp. 2248-2258, (2018)
  • [7] Mackay L., Guarnotta R., Dimou A., Et al., Optimal power flow for unbalanced bipolar DC distribution grids, IEEE Access, 6, pp. 5199-5207, (2018)
  • [8] Prabhakaran P., Agarwal V., Mitigation of voltage unbalance in a low voltage bipolar DC microgrid using a boost-SEPIC type interleaved dc-dc compensator, Proceedings of 2nd Annual Southern Power Electronics Conference (SPEC), (2016)
  • [9] Jung T.H., Gwon G.H., Kim C.H., Et al., Voltage regulation method for voltage drop compensation and unbalance reduction in bipolar low-voltage DC distribution system, IEEE Transactions on Power Delivery, 33, 1, pp. 141-149, (2018)
  • [10] Gao Y., Xu X., Jin Y., Et al., Impact on the voltage balancing of DC distribution network under AC side grounding-fault, Power System Technology, 38, 10, pp. 2665-2670, (2014)
12