Controlled islanding for a hybrid AC/DC grid with VSC-HVDC using semi-supervised spectral clustering

As the last resort of emergency control, controlled islanding is an effective means of preventing fault-propagation and a system-wide blackout. However, conventional AC transmission lines are unavailable to be employed for power exchange between these islands. To make full use of the DC power modula...

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Bibliographic Details
Published in:arXiv.org 2018-12
Main Authors: Yang, Li, Wu, Shangsong
Format: Article
Language:English
Subjects:
Blackout
Clustering
Computer simulation
Disruption
Electric power distribution
Electric power systems
Electric power transmission
Exchanging
Islands
Segmentation
Transmission lines
Online Access:Get full text
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Summary:As the last resort of emergency control, controlled islanding is an effective means of preventing fault-propagation and a system-wide blackout. However, conventional AC transmission lines are unavailable to be employed for power exchange between these islands. To make full use of the DC power modulation capability of VSC-HVDC links, a new controlled islanding model is put forward for an AC/VSC-HVDC hybrid grid to minimize the composite power-flow disruption, in which the DC-terminals belonging to a VSC-HVDC link are placed in different islands. To solve this model, a semi-supervised spectral clustering-based approach is proposed by transforming the problem into a weighted undirected graph segmentation problem. The novelty of our work is to find an optimal islanding solution in real time such that the power exchanges between islands are implemented via a VSC-HVDC link to reduce the generation-load imbalance. The simulation results on the IEEE 39-bus system and a real-world system verify the effectiveness and superiority of the proposed approach.
ISSN:2331-8422
DOI:10.48550/arxiv.1812.05539