Advertisement

Improvements of Droop Control Strategy for Grid-Connected Inverters of Micro-Sources

  • Yun Ling Sun
  • Guan Nan Wang
  • Wen Jun Wang
  • Dong Wang
  • Li Zhang
  • Wei Huang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 238)

Abstract

Big droop coefficients tend to reduce stability of microgrid, while small droop coefficients result in slow responding of inverter. In order to overcome the disadvantage, we propose a kind of droop control strategy based on nonlinear droop characteristic which is similar to that of magnetic hysteresis. Through real-time changing droop gains appropriately, the proposed strategy is to improve load power distribution accuracy, effectively suppress the wide fluctuations of frequency and voltage, and improve the stability of the system. At the same time, adding a feed forward path on the power droop block further improves the stability. Then the reduced small-signal mathematical model of microgrid is developed, confirming the small disturbance stability. The time domain simulation is conducted in the power systems computer aided design. The results verify the effectiveness of the control strategy.

References

  1. 1.
    Morozumi S (2007) Microgrid demonstration projects in Japan. In: IEEE Power Conversion Conference. pp 635–624Google Scholar
  2. 2.
    Borup U, Blaabjerg F, Enjeti PN (2001) Sharing of nonlinear load in parallel-connected three-phase converters. IEEE Trans Ind Appl 37(6):1817–1823CrossRefGoogle Scholar
  3. 3.
    Zhou ZX, Rong F (2012) A coordinate rotational transformation based virtual power V/f droop control method for low voltage microgrid. Autom Electr Power Syst 36(2):47–63Google Scholar
  4. 4.
    Wang Y, Lu ZX (2012) Small-signal analysis of microgrid with multiple micro sources based on reduced order model in islanding operation. Trans Chin Electrotechn Soc 27(1):1–8Google Scholar
  5. 5.
    Nagaraju P, Milan P, Timothy CG (2007) Modeling, analysis and testing of autonomous operation of an Inverter-Based Microgrid. IEEE Trans Power Electron 22(2):613–624Google Scholar
  6. 6.
    Katraei F, Iravani MR (2006) Power management strategies for a microgrid with multiple distributed generation units. IEEE Trans Power Syst 21(4):1821–1831CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yun Ling Sun
    • 1
  • Guan Nan Wang
    • 1
  • Wen Jun Wang
    • 1
  • Dong Wang
    • 2
  • Li Zhang
    • 2
  • Wei Huang
    • 1
  1. 1.School of Electrical Engineering North China Electronic Power UniversityBeijingChina
  2. 2.Zhumadian Power Supply CompanyZhumadianChina

Personalised recommendations