Active Power Sharing and Frequency Restoration in an Autonomous Networked Microgrid

M. Eskandari, L. Li, M. H. Moradi, P. Siano, F. Blaabjerg

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)
198 Downloads (Pure)

Abstrakt

Microgrid (MG) concept is considered as the best solution for future power systems, which are expected to receive a considerable amount of power through renewable energy resources and distributed generation units. Droop control systems are widely adopted in conventional power systems and recently in MGs for power sharing among generation units. However, droop control causes frequency fluctuations, which leads to poor power quality. This paper deals with frequency fluctuation and stability concerns of f-P droop control loop in MGs. Inspired from conventional synchronous generators, virtual damping is proposed to diminish frequency fluctuation in MGs. Then, it is demonstrated that the conventional frequency restoration method inserts an offset to the phase angle, which is in conflict with accurate power sharing. To this end, a novel control method, based on phase angle feedback, is proposed for frequency restoration in conjunction with a novel method for adaptively tuning the feedback gains to preserve precise active power sharing. Nonlinear stability analysis is conducted by drawing the phase variations of the nonlinear second-order equation of the δ-P droop loop and it is proved that the proposed method improves the stability margin of f-P control loop. Simulation results demonstrate the effectiveness of the proposed method.
OriginalsprogEngelsk
Artikelnummer8740943
TidsskriftIEEE Transactions on Power Systems
Vol/bind34
Udgave nummer6
Sider (fra-til)4706 - 4717
Antal sider12
ISSN0885-8950
DOI
StatusUdgivet - nov. 2019

Emneord

  • Power system stability
  • Frequency control
  • Stability analysis
  • Power system dynamics
  • Voltage control
  • Control systems
  • Circuit stability
  • Distributed generation (DG)
  • Droop control
  • Frequency restoration
  • Microgrid (MG)
  • Power control
  • Renewable energy resources (RESs)

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