Localization of Oscillation Source in DC Distribution Network Based on Power Spectral Density

Abstract

Direct current (DC) bus voltage stability is essential for the stable and reliable operation of a DC system. If an oscillation source can be quickly and accurately localized, the oscillation can be adequately eliminated. We propose a method based on the power spectral density for identifying the voltage oscillation source. Specifically, a DC distribution network model combined with the component connection method is developed, and the network is separated into multiple power modules. Compared with a conventional method, the proposed method does not require determining the model parameters of the entire power grid, which is typically challenging. Furthermore, combined with a novel judgment index, the oscillation source can be identified more intuitively and clearly to enhance the applicability to real power grids. The performance of the proposed method has been evaluated using the MATLAB/Simulink software and PLECS RT Box experimental platform. The simulation and experimental results verify that the proposed method can accurately identify oscillation sources in a DC distribution network.

Vienna Rectifier Modeling and Harmonic Coupling Analysis Based on Harmonic State-Space

“…With the development of distributed power generation, charging stations, and microgrids, a large number of electronic power devices have become connected to the distribution grid. The interaction characteristics between power electronic devices and transmission lines may lead to accidents such as oscillations, harmonic amplification, and harmonic resonance [1][2][3][4], accompanied by harmonic interaction phenomena [5,6], resulting in serious degradation of the power quality on the distribution grid side.…”