Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

This paper proposes an autonomous control scheme to mitigate voltage-frequency excursions observed in a network of grid forming (GFM) and grid following (GFL) inverters in a power electronics dominated grid (PEDG). The proposed control scheme leverages GFL inverter's ability to dynamically adju...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-02, Vol.71 (2), p.1-11
Main Authors: D'silva, Silvanus, Zare, Alireza, Shadmand, Mohammad B., Bayhan, Sertac, Abu-Rub, Haitham
Format: Article
Language:English
Subjects:
Algorithms
Decentralized control
frequency restoration
grid following inverter
grid forming inverter
Inverters
Modal choice
Power system stability
Reactive power
Resilience
resiliency
Supervisory control
Synchronization
Voltage control
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Summary:This paper proposes an autonomous control scheme to mitigate voltage-frequency excursions observed in a network of grid forming (GFM) and grid following (GFL) inverters in a power electronics dominated grid (PEDG). The proposed control scheme leverages GFL inverter's ability to dynamically adjust their power set-points as well as change their operation mode on-the-fly to enhance the PEDG resiliency. A supervisory controller (SC) comprising of a Droop-ΔP estimator coupled with an optimal power allocator (OPA) module dynamically adjusts the power injections from GFL inverters to maintain the power balance and restore frequency in response to disturbances. Moreover, the proposed self-ranking based coordinated mode selection (SR-CMS) algorithm dynamically reconfigures the inverter's operation mode (either GFM or GFL) to enhance the PEDG resiliency in response to events and ensure GFM inverter allocation in grid clusters. Several case studies are performed to validate the feasibility, performance, and robustness of proposed autonomous control. Finally, the proposed scheme is experimentally validated on a small-scale hardware testbed.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2023.3262866