A hierarchical control approach to improve the voltage and frequency stability for hybrid microgrids-based distributed energy resources

Toularoud, Moussa Saadati; Rudposhti, Mohammad Khoshhal; Bagheri, Sajad; Salemi, Amir Hossein

doi:10.1016/j.egyr.2023.09.079

Cited by 5 publications

(1 citation statement)

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“…Droop control is generally suitable for the stable operation of isolated microgrids; it is a proportional adjustment method but may face challenges during the transition to grid-connected states [18,19]. Currently, energy storage systems controlled through V/f control are commonly used to stabilize the voltage and frequency of islanded microgrids [20][21][22][23]. Improvements are made to this control structure to achieve presynchronization adjustments of the voltage, frequency, and phase.…”

Section: Introductionmentioning

confidence: 99%

Microgrid Pre-Synchronization Scheme for Suppressing Voltage Fluctuations and Avoiding Frequency Out-of-Limits

Gong,

Qin,

Liu

et al. 2024

Electronics

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Pre-synchronization control is needed when the microgrid changes from an off-grid state to a grid-connected state. Aiming to resolve the problems of frequency overstep and voltage fluctuation in traditional pre-synchronous grid-connection schemes, a micro-grid pre-synchronous grid-connection scheme is proposed that can solve both frequency overstep and voltage fluctuation at the same time. Firstly, the feedforward disturbance compensation V/f control strategy of the load voltage and current is introduced to the energy storage system to suppress voltage fluctuations caused by power changes. Then, the V/f control strategy of the energy storage system is improved to suppress voltage fluctuations caused by frequency fluctuations when the starting phase of pre-synchronization is enacted. Finally, PI parameters are optimized based on the golden jackal optimization algorithm to meet the requirements of frequency fluctuation and grid-connection speed in the pre-synchronization process. A large number of simulation experiments demonstrate the effectiveness of the proposed method.

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