Comparison of Two Approaches of Resolving Power Sharing Error in Droop Based DC Microgrids

  • Hooman Khamooshpoor Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran.
  • Mehdi Baharizadeh Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran.
  • Mohammad Hossein Ershadi Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran.
Keywords: DC Microgrids, Distributed Energy Resources, Droop Characteristics, Power Sharing

Abstract

DC microgrids have gained extensive attention in the recent years. In the islanded mode of operation power sharing between sources is required. The power sharing usually is provided by employing P-V droop characteristics while the voltage local property results in power sharing error. In this paper two decentralized approaches for resolving power sharing error are studied and compared. In the first approach, sources employ proper virtual resistance. In second approach, droop characteristics are realized in the Point of Common Coupling (PCC). It is shown that by using second approach, the voltage drop is reduced and equally the voltage quality is improved. It is discussed that the reason is bypassing the voltage drop associated with the sources output resistance in the second approach. Time domain simulations of a test DC microgrid are provided to verify the results.

References

[1] H., Nikos, H. Asano, R. Iravani, and Ch. Marnay. "Microgrids." IEEE power and energy magazine 5, No. 4, pp. 78-94, 2007.
[2] Lasseter, Robert H., and P. Piagi. "Microgrid: A Conceptual Solution." In IEEE Power Electronics Specialists Conference, Vol. 6, pp. 4285-4291, 2004.
[3] Katiraei, F., Iravani, R., Hatziargyriou, N. and Dimeas, A., “Microgrids Management.” IEEE power and energy magazine, 6(3), pp. 54-65, 2008.
[4] Guerrero, J M., .Juan C. Vasquez, José Matas, Luis García De Vicuña, and Miguel Castilla. "Hierarchical Control of Droop-controlled AC and DC Microgrids—A General Approach toward Standardization." IEEE Transactions on industrial electronics 58, No. 1, pp. 158-172, 2010.
[5] Dragičević, T., Xiaonan L., Juan C. Vasquez, and Josep M. Guerrero. "DC microgrids—Part I: A Review of Control Strategies and Stabilization Techniques." IEEE Transactions on power electronics 31, No. 7, pp. 4876-4891, 2015.
[6] Dragičević, Tomislav, Xiaonan Lu, Juan C. Vasquez, and Josep M. Guerrero. "DC Microgrids—Part II: A Review of Power Architectures, Applications, and Standardization issues." IEEE transactions on power electronics 31, No. 5, pp. 3528-3549, 2015.
[7] Baharizadeh, M., Karshenas, H. and Ghaisari, J., “Limit Cycle Occurrence During Reactive Power Generation by Interlinking Converter in Hybrid Microgrids.” Canadian Journal of Electrical and Computer Engineering, 39(2), pp. 181-189, 2016.
[8] Dragičević, Tomislav, Josep M. Guerrero, Juan C. Vasquez, and Davor Škrlec. "Supervisory Control of an Adaptive-Droop Regulated DC Microgrid with Battery Management Capability." IEEE Transactions on power Electronics 29, No. 2, pp. 695-706, 2013.
[9] Li, Yun Wei, and Ching-Nan Kao. "An Accurate Power Control Strategy for Power-Electronics-Interfaced Distributed Generation Units Operating in a Low-Voltage Multibus Microgrid." IEEE Transactions on Power Electronics 24, No. 12, pp. 2977-2988, 2009.
[10] Lu, X., Guerrero, J.M., Sun, K. and Vasquez, J.C., “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, 29(4), pp. 1800-1812, 2013.
[11] Tuladhar, A., and H. Jin. "A Novel Control Technique to Operate DC/DC Converters in Parallel with No Control Interconnections." In PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No. 98CH36196), Vol. 1, pp. 892-898, 1998.
[12] Saghafi, Hadi, and Hamid Reza Karshenas. "Power Sharing Improvement in Standalone Microgrids with Decentralized Control Strategy." Electric Power Components and Systems 42, No. 12, pp. 1278-1288, 2014.
[13] Shafiee, Qobad, Josep M. Guerrero, and Juan C. Vasquez. "Distributed Secondary Control for Islanded Microgrids—A Novel Approach." IEEE Transactions on power electronics 29, No. 2, pp. 1018-1031, 2013.
[14] Anand, S., Fernandes, B.G. and Guerrero, J., “Distributed Control to Ensure Proportional Load Sharing and Improve Voltage Regulation in Low-Voltage DC Microgrids.” IEEE transactions on power electronics, 28(4), pp. 1900-1913, 2012.
[15] He, J. and Li, Y.W., “An Enhanced Microgrid Load Demand Sharing Strategy.” IEEE Transactions on Power Electronics, 27(9), pp. 3984-3995, 2012.
[16] He, Jinwei, Yun Wei Li, Josep M. Guerrero, Frede Blaabjerg, and Juan C. Vasquez. "An Islanding Microgrid Power Sharing Approach Using Enhanced Virtual Impedance Control Scheme." IEEE Transactions on Power Electronics 28, No. 11, pp. 5272-5282, 2013.
[17] Baharizadeh, Mehdi, Hamid Reza Karshenas, and Josep M. Guerrero. "An Improved Power Control Strategy for Hybrid AC-DC Microgrids." International Journal of Electrical Power & Energy Systems 95, pp. 364-373, 2018.
Published
2020-06-01
How to Cite
Khamooshpoor, H., Baharizadeh, M., & Ershadi, M. H. (2020). Comparison of Two Approaches of Resolving Power Sharing Error in Droop Based DC Microgrids. Majlesi Journal of Electrical Engineering, 14(2), 111-115. Retrieved from http://mjee.org/index/index.php/ee/article/view/3484
Section
Articles