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Keywords

DC microgrid; interactive influence; stability analysis; quadratic index; Monte Carlo; multi-controllerparameter optimization

Abstract

In DC microgrids, there is interaction between different types of converters, which is easy to be affected by disturbance during operation, resulting in decreased power quality.Therefore, the stability of DC microgrids has become a key issue in microgrid research.In this paper, the small signal model of DC microgrid system including voltage source converter （VSC） and buck-boost DC-DC converter is derived, and the eigenvalues and participation factors of the system are calculated.The stability regions of key control parameters such as PI parameter, droop coefficient, and virtual inertia coefficient are compared with and without grid-connected converter.Then, according to the quadratic theory, the influence of different controller parameters on the system stability margin is studied.Finally, Monte Carlo algorithm is used to optimize the parameters of several key controllers globally.Simulation results show that the stability of the system with grid-connected converter is stronger.The optimized system has a smaller quadratic index, larger system damping, increased maximum power output of the energy storage, and improved stability margin.

DOI

10.19781/j.issn.1673-9140.2025.05.018

First Page

195

Last Page

204

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