A sigmoid-based adaptive inertia control strategy for grid-forming inverter to enhance frequency stability

Introduction: This paper proposes a sigmoid-based adaptive inertia control strategy for grid-forming (GFM) inverter to enhance frequency stability. Methods: Firstly, the frequency response characteristics under different disturbances are analyzed theoretically. Then, to solve the problem that fixed...

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Bibliographic Details
Published in:Frontiers in energy research 2023-04, Vol.11
Main Authors: Huang, Renzhi, Dong, Chen, Wu, Zaijun, Quan, Xiangjun, Wang, Zichen, Sun, Tiankui, Hou, Kai
Format: Article
Language:English
Subjects:
adaptive inertia control
frequency stability
grid-forming (GFM) inverter
sigmoid function
small-signal model
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Summary:Introduction: This paper proposes a sigmoid-based adaptive inertia control strategy for grid-forming (GFM) inverter to enhance frequency stability. Methods: Firstly, the frequency response characteristics under different disturbances are analyzed theoretically. Then, to solve the problem that fixed inertia leads to a contradiction between the maximum frequency deviation and the setting time, a non-linear inertia regulator is investigated. This non-linear inertia regulator, which is based on an improved sigmoid function, is applied to achieve real-time inertia by the frequency deviation. Moreover, the full-order small-signal model of the system containing the nonlinear inertia regulator is established and thus the stability of the proposed strategy is analyzed. Result and Discussion: The proposed control strategy is implemented without derivative action, which may suffer from high-frequency noises. Finally, the hardware-inthe-loop (HIL) results verify the remarkable performance of the proposed control strategy.
ISSN:2296-598X
2296-598X
DOI:10.3389/fenrg.2023.1095610