A seamless switching technology based on VSG applied to microgrid

Fang, Tiancheng; Jiang, Weihua; Hu, Weibing

doi:10.1109/aicit55386.2022.9930228

Cited by 3 publications

(1 citation statement)

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“…Existing distribution networks typically consist of multiple microgrids composed of components such as distributed generation (DG), energy storage systems, and loads [5][6][7]. These microgrids can switch between off-grid and grid-connected modes, thus requiring pre-synchronization control for islanded microgrids before grid connection [8][9][10][11][12][13].…”

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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