Open Access

ARTICLE

Research on the Stability Analysis Method of DC Microgrid Based on Bifurcation and Strobe Theory

Wei Chen, Nan Qiu^*, Xusheng Yang

School of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

* Corresponding Author: Nan Qiu. Email:

(This article belongs to the Special Issue: Key Technologies of Renewable Energy Consumption and Optimal Operation under )

Energy Engineering 2024, 121(4), 987-1005. https://doi.org/10.32604/ee.2023.045475

Received 18 September 2023; Accepted 07 November 2023; Issue published 26 March 2024

Abstract

During the operation of a DC microgrid, the nonlinearity and low damping characteristics of the DC bus make it prone to oscillatory instability. In this paper, we first establish a discrete nonlinear system dynamic model of a DC microgrid, study the effects of the converter sag coefficient, input voltage, and load resistance on the microgrid stability, and reveal the oscillation mechanism of a DC microgrid caused by a single source. Then, a DC microgrid stability analysis method based on the combination of bifurcation and strobe is used to analyze how the aforementioned parameters influence the oscillation characteristics of the system. Finally, the stability region of the system is obtained by the Jacobi matrix eigenvalue method. Grid simulation verifies the feasibility and effectiveness of the proposed method.

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Keywords

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