Consensus-Based Voltage Restoration and Synchronization of Islanded Microgrid in the Presence of Communication Latency and Noise
DOI:
https://doi.org/10.63746/njtd.v22i3.3610Keywords:
voltage control, latency, noise, microgrid, consensus method, multi-agentAbstract
Secondary control of microgrids (MGs) commonly employs consensus algorithms over communication networks to coordinate control objectives across distributed units. However, communication delays and noise, can adversely affect the dynamic performance of the system and, in severe cases, compromise overall stability. This paper proposes a robust distributed secondary control strategy for inverter-based MGs operating within sparsely connected distribution networks. A consensus-based control framework is employed to achieve voltage synchronization among distributed generators (DGs) in an islanded MG. The control scheme leverages a detailed MG model to design a consensus-based secondary controller that compensates for voltage and local reactive power deviations, utilizing information exchanged over communication links subject to latency and noise disturbances. The effectiveness of the proposed control approach is validated through simulation studies conducted on a four-DG MG test system developed in the MATLAB/SimPowerSystems environment. Voltage restoration performance evaluated under the following delay conditions: ??? = 0.6 s, ??? = 0.7 s, ??? = 0.8 s, and ??? = 1.0 s, indicate that the time required by the system to reach synchronization increases proportionally with the level of delay. At a maximum latency of 1.0 s, the system achieves voltage consensus approximately 3.3 seconds. Under communication noise impairment with varying noise variances, specifically ?² = 0.1, 0.2, 0.3, and 0.4. Voltage synchronization was achieved across all scenarios, with an average convergence time of approximately 3 seconds. Results demonstrate that the proposed method effectively maintains voltage synchronization across the DGs under varying load conditions, even in the presence of communication impairments.
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