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

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 gri...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on smart grid 2020-05, Vol.11 (3), p.2106-2114
Main Authors: Ganjian-Aboukheili, M., Shahabi, M., Shafiee, Q., Guerrero, Josep M.
Format: Article
Language:English
Subjects:
Circuit breakers
Control theory
Distributed generation
Electric power systems
Electrical loads
Energy sources
Feedforward control
Grid-connected
Inverters
Islanding
islanding mode
Microgrids
modified droop control
Pulse width modulation
Small signal analysis
smooth transition
Stability analysis
Strategy
Voltage control
Voltage controllers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2019.2947651