Distributed optimal frequency control in networked microgrids using distributed energy resources

doi:10.1016/j.epsr.2025.111697

Distributed optimal frequency control in networked microgrids using distributed energy resources

2025-04-25

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DOI：10.1016/j.epsr.2025.111697

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In this paper, a distributed frequency control strategy is proposed for off-grid networked microgrid system (NMG). The whole control problem is designed such that the system frequency can be regulated through a hierarchical optimal dispatch of controllable inverter-based distributed energy resources (IBDs). In the proposed control scheme, a local disturbance estimator is firstly established for each MG. Then, based on the estimation of local power imbalance, IBDs of each MG are prioritized to balance local disturbance. If the local IBDs are insufficient for regulation, additional power will be sourced from electrically neighboring microgrids (MGs). To coordinate MGs within the NMG while preserving information privacy, the control scheme is implemented in a distributed manner by employing the alternating direction method of multipliers (ADMM) algorithm, which is realized via only local measurements and limited communication between neighboring MGs. Various simulation results on detailed 3-MG NMG and 5-MG NMG models demonstrate the effectiveness and advantages of the proposed scheme.

Keyword:

Distributed control

Frequency control

Networked microgrid system

Alternating direction method of multipliers (ADMM)

Distributed optimal frequency control in networked microgrids using distributed energy resources

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