Seamless Transition of Microgrids Operation from Grid-Connected to Islanded Mode

M. Ganjian-Aboukheili, M. Shahabi*, Q. Shafiee, Josep M. Guerrero

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

8 Citationer (Scopus)
23 Downloads (Pure)

Abstrakt

One of the main features of Microgrids is the ability to operate in both grid-connected mode and islanding mode. In each mode of operation, distributed energy resources (DERs) can be operated under grid-forming or grid-following control strategies. In grid-connected mode, DERs usually work under grid-following control strategy, while at least one of the DERs must operate in grid-forming strategy in islanding mode. A microgrid may experience remarkable fluctuations in voltage and current due to an unintentional islanding event. To achieve a smooth transition to islanding mode and mitigate disturbance effect, this paper proposes a control strategy includes a) a linear voltage controller with capacitor current feedback as an input to the voltage controller and output current feedforward as an input to current controller, and b) modified droop control to emulate the inertia response of a synchronous generator. The proposed controller can suppress voltage, current and frequency fluctuations and also guarantee a smooth transition. A small signal analysis of the proposed control strategy is developed to design its coefficients as well as the destabilizing effect of constant power load (CPL). Experimental results are provided to verify the effectiveness of the proposed control strategy.
OriginalsprogEngelsk
Artikelnummer8869850
TidsskriftIEEE Transactions on Smart Grid
Vol/bind11
Udgave nummer3
Sider (fra-til)2106-2114
Antal sider9
ISSN1949-3053
DOI
StatusUdgivet - maj 2020

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