• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 30 Issue 5
Sep.  2017
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Article Contents
WANG Tianhong, LI Qi, CHENG Weirong. Adaptive Virtual Impedance Droop Control Method in Load Sharing[J]. Journal of Southwest Jiaotong University, 2017, 30(5): 1020-1028. doi: 10.3969/j.issn.0258-2724.2017.05.025
Citation: WANG Tianhong, LI Qi, CHENG Weirong. Adaptive Virtual Impedance Droop Control Method in Load Sharing[J]. Journal of Southwest Jiaotong University, 2017, 30(5): 1020-1028. doi: 10.3969/j.issn.0258-2724.2017.05.025

Adaptive Virtual Impedance Droop Control Method in Load Sharing

doi: 10.3969/j.issn.0258-2724.2017.05.025
  • Received Date: 20 Nov 2016
  • Publish Date: 25 Oct 2017
  • An adaptive virtual impedance droop control method considering line impedance is proposed to achieve load sharing of a DC grid system and improve system stability. Based on the output droop characteristics and the principle of virtual impedance, the load voltage and current are taken into consideration in the virtual impedance algorithm. Then, the virtual resistance obtained is modified to realize adaptive correction, which effectively improves the load sharing performance. Finally, experimental measurement and comparison with traditional droop control and traditional virtual impedance droop control are carried out on the experimental platform. The results indicate that the traditional virtual impedance droop control mode and adaptive virtual impedance droop control mode can maintain the load current difference under 0.04 A. Further, the parallel output current difference is small, and the load regulation rate of the adaptive virtual impedance droop control method is 0.1%, which is lower than those of the other two control methods. Given factors such as output current difference, load regulation rate, and bus voltage, the adaptive virtual impedance droop control method has load sharing superiority and system stability.

     

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