A Virtual Parallel Inductor Approach for Mitigating Reactive Power Sharing Error in a VSG Controlled Microgrid

Virtual synchronous generators (VSGs) deployed into an islanded microgrid emulates the Q-V droop nature of a synchronous generator. Although the Q-V droop control of VSGs enhances the voltage stability, the installed distant VSGs have unequal line impedances due to their random location and rated ca...

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Bibliographic Details
Published in:IEEE systems journal 2023-03, Vol.17 (1), p.1363-1374
Main Authors: Rasool, Aazim, Fahad, Shah, Yan, Xiangwu, Jiaoxin, Jia, Rasool, Haaziq, Jamil, Mohsin
Format: Article
Language:English
Subjects:
Controllability
Distributed generation
Eigenvalues
Impedance
Inductors
Mathematical models
Microgrid
Microgrids
Oils
Reactive power
reactive power-sharing
Synchronous machines
virtual parallel inductor
virtual synchronous generator
Voltage
Voltage control
Voltage stability
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Summary:Virtual synchronous generators (VSGs) deployed into an islanded microgrid emulates the Q-V droop nature of a synchronous generator. Although the Q-V droop control of VSGs enhances the voltage stability, the installed distant VSGs have unequal line impedances due to their random location and rated capacity. The unequal line impedance hinders the proportional reactive power-sharing between VSGs. The proposed study is focused on minimizing the reactive power sharing error by introducing a virtual parallel inductor (VPI) concept. A mathematical model is proposed to create and exploit the analogous relation between the exponential behavior of the VPI and the controllable voltage source to mitigate the reactive power sharing error and simultaneously strengthen the voltage control accuracy. In addition, a droop within a droop strategy is introduced to enhance the reactive power sharing capability of the VSGs. Furthermore, a detailed eigenvalue analysis is conducted to evaluate the limitations of the proposed model. Finally, to test the superiority of the proposed model over the state-of-the-art methods, simulation and hardware experimental results are presented.
ISSN:1932-8184
1937-9234
DOI:10.1109/JSYST.2022.3180998