International Journal of Fuzzy Systems

, Volume 21, Issue 3, pp 782–792 | Cite as

Improvement in Two Adjacent Microgrids Frequency Using the AC-to-AC Converter Based on Sugeno Fuzzy Control Scheme

  • Behrouz Alefy
  • Heydar Ali ShayanfarEmail author
  • Soudabeh Soleymani
  • Faramarz Faghihi


Microgrid and multi-microgrid are solution for integrating DGs into a system and are components of future power systems. Exploitation and frequency control in islanding mode is of special importance due to the lack of sufficient spinning reserve. Almost, DGs are connected to the microgrid through inverters and frequency deviation from an allowed threshold makes their removal from the main grid which is not acceptable for consumers and producers of the electrical power. One way for frequency control and optimized exploitation of the entire system is to connect the adjacent microgrids. Indeed, the microgrids cooperate together through exchanging their power surplus and power shortage. In this paper, a new hybrid control method based on Sugeno- and Mamdani-type fuzzy inference system to control an AC-to-AC converter connector of two adjacent microgrids has been proposed. An analytical method for controlling the converter was developed using the Sugeno. The proposed method is simple and practical and can be easily implemented. Moreover, to eliminate the steady-state error and to modify the performance of the control system, it is proposed to use a PI fuzzy controller in its outer loop. Simulation results show that the AC-to-AC converter with the proposed controlling strategy has prevented the intensive frequency deviations and has improved the frequency control in both microgrids.


AC-to-AC converter Sugeno-type fuzzy inference system PI fuzzy controller Frequency control Microgrid Renewable energy 

List of Symbols





Distributed generation


Flexible alternating current transmission system


High-voltage direct current


Superconducting magnetic energy storage






Wind turbine


Fuel cell



Number of microgrid (1 or 2)


\(V_{{d_{k} }}\)

The voltage of converter bus in “d” axis

\(V_{{q_{k} }}\)

The voltage of converter bus in “q” axis

\(E_{{d_{k} }}\)

The voltage of MG bus in “d” axis

\(E_{{q_{k} }}\)

The voltage of MG bus in “q” axis


Resistance of line


Currents contributed of “d” axis in line


Currents contributed of “q” axis in line


Inductance of line


Angular velocity


Complex variable

\(K_{{dp_{k} }}\)


\(K_{{qp_{k} }}\)



Active power


Reactive power


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Copyright information

© Taiwan Fuzzy Systems Association 2019

Authors and Affiliations

  • Behrouz Alefy
    • 1
  • Heydar Ali Shayanfar
    • 2
    Email author
  • Soudabeh Soleymani
    • 1
  • Faramarz Faghihi
    • 1
  1. 1.Department of Electrical Engineering, Science and Research BranchIslamic Azad UniversityTehranIran
  2. 2.Faculty of Electrical and Computer EngineeringIran University of Science and TechnologyTehranIran

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