Abstract
In this chapter, the modeling, controller design, and stability analysis of islanded microgrid using enhanced hierarchical control structure with multiple current loop damping schemes are proposed. And then, a small-signal model for the primary and secondary controls with additional phase-shift loop is presented, and the moving average filter-based sequence decomposition method is proposed to extract the fundamental positive and negative sequences, and harmonic components. Next, the multiple inner current loop damping scheme is presented, including the virtual positive, virtual negative, and variable harmonic sequence impedance loops for reactive and harmonic power sharing purposes and the proposed active damping scheme using capacitor current feedback loop of the LCL filter, which shows enhanced damping characteristics and improved inner-loop stability features. Then, the simulation results obtained from EMTP-ATP under nonidentical line impedance scenario are presented, and the effect of the low-bandwidth communication delay is also simulated and compared with ideal scenario. Finally, the experimental results are also provided to validate the feasibility of the proposed approach, which can be widely applied in practical applications.
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Han, Y. (2022). Enhanced Hierarchical Control for Islanded Microgrid Using Advanced Damping Methods. In: Modeling and Control of Power Electronic Converters for Microgrid Applications. Springer, Cham. https://doi.org/10.1007/978-3-030-74513-4_8
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DOI: https://doi.org/10.1007/978-3-030-74513-4_8
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