The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Energy Management Method of DC Microgrids by Using Voltage Compensation Term

전압 변동 보상항을 이용한 직류 마이크로그리드의 에너지 관리 기법

  • Ko, Byoung-Sun (Dept. of Electrical Engineering, HYPEC-EECS Lab, Hanyang University) ;
  • Lee, Gi-Young (Dept. of Electrical Engineering, HYPEC-EECS Lab, Hanyang University) ;
  • Kim, Seok-Woong (Basic Research Center for Electric Power, KEPCO Research Institute) ;
  • Kim, Rae-Young (Dept. of Electrical Bio-Engineering, Hanyang University)
  • Received : 2018.07.12
  • Accepted : 2018.08.14
  • Published : 2018.10.20
Download PDF
⟨ Previous Next ⟩

Abstract

An energy management method of DC microgrids using voltage compensation term is proposed in this study. Droop control is often implemented to operate the DC microgrid. However, the droop control necessarily generates voltage variation. Energy flow is also difficult to control because the droop control mainly focuses on proportional load sharing. To solve these problems, the voltage compensation term based on the low-bandwidth communication is used to determine the operating band of the converter. Energy management and voltage variation minimization can be achieved by judging the operating band according to the magnitude of voltage compensation term. The validity of the proposed method is verified by simulation and experiments.

Keywords

References

  1. B. S. Ko, G. Y. Lee, S. I. Kim, R. Y. Kim, J. T. Cho, and J. Y. Kim. "A positioning method of distributed power system by considering characteristics of droop control in a DC microgrid," Journal of Electrical Engineering & Technology, Vol. 13, No. 2, pp. 620-630, Mar. 2018. https://doi.org/10.5370/JEET.2018.13.2.620
  2. T. Dragicevic, X. Lu, J. C. Vasquez, and J. M. Guerrero, “DC microgrids-Part I: A review of control strategies and stabilization techniques,” IEEE Transactions on Power Electronics, Vol. 31, No. 7, pp. 4876-4891, Jul. 2016. https://doi.org/10.1109/TPEL.2015.2478859
  3. Y. Ito, Y. Zhongqing, and H. Akagi, "DC microgrid based distribution power generation system," in The 4th International Power Electronics and Motion Control Conference, 2004, Vol. 3, pp. 1740-1745, 2004.
  4. Y. Gu, X. Xiang, W. Li, and X. He, "Mode-adaptive decentralized control for renewable DC microgrid with enhanced reliability and flexibility," IEEE Transactions on Power Electronics, Vol. 29, pp. 5072-5080, 2014. https://doi.org/10.1109/TPEL.2013.2294204
  5. Y. Gu, W. Li, and X. He, “Frequency-coordinating virtual impedance for autonomous power management of DC microgrid,” IEEE Transactions on Power Electronics, Vol. 30, No. 4, pp. 2328-2337, Apr. 2015. https://doi.org/10.1109/TPEL.2014.2325856
  6. S. Anand, B. G. Fernandes, and J. Guerrero, “Distributed control to ensure proportional load sharing and improve voltage regulation in low-voltage DC microgrids,” IEEE Transactions on Power Electronics, Vol. 28, No. 4, pp. 1900-1913, Apr. 2013. https://doi.org/10.1109/TPEL.2012.2215055
  7. G. Y. Lee, B. S. Ko, J. Cho, and R. Y. Kim, "A distributed control method based on a voltage sensitivity matrix in DC microgrids with low-speed communication," IEEE Transactions on Smart Grid, May 2018.
  8. X. Lu, J. M. Guerrero, K. Sun, and J. C. Vasquez, “An improved droop control method for DC microgrids based on low bandwidth communication with DC bus voltage restoration and enhanced current sharing accuracy,” IEEE Transactions on Power Electronics, Vol. 29, No. 4, pp. 1800-1812, Apr. 2014. https://doi.org/10.1109/TPEL.2013.2266419
  9. P. Wang, X. Lu, X. Yang, W. Wang, and D. Xu, “An improved distributed secondary control method for DC microgrids with enhanced dynamic current sharing performance,” IEEE Transactions on Power Electronics, Vol. 31, No. 9, pp. 6658-6673, Sep. 2016. https://doi.org/10.1109/TPEL.2015.2499310