Abstract
Reasonable and strong structure is an important foundation for the smart transmission grid. For vigorously promoting construction of the smart grid, it is of great significance to have a thorough understanding of the complex structural characteristics of the power grid. The structural characteristics of several actual large-scale power grids of China are studied in this paper based on the complex network theory. Firstly, the topology-based network model of power grid is recalled for analyzing the statistical characteristic parameters. The result demonstrated that although some statistical characteristic parameters could reflect the topological characteristics of power grid from different ways, they have certain limitation in representing the electrical characteristics of power grid. Subsequently, the network model based on the electrical distance is established considering the limitation of topology-based model, which reflects that current and voltage distribution in the power grid are subject to Ohm's Law and Kirchhoff's Law. Comparing with the topology-based model, the electrical distance-based model performs better in reflecting the natural electrical characteristic structure of power grid, especially intuitive and effective in analyzing clustering characteristics and agglomeration characteristics of power grid. These two models could complement each other.
Highlights
In recent years, the smart grid has become a new trend development of the power grid in the world
The network model based on practical topological structure is established and the statistical characteristic parameters of topology-based models of all involved power grids are analyzed
The results demonstrate that these parameters can reflect the topological characteristics of power grids to certain extent from different sides
Summary
The smart grid has become a new trend development of the power grid in the world. Comparing with the geographical wiring layout, the visualization of power grid based on K-K layout algorithm enjoys obvious superiorities in representing the electrical connection: node distribution fully represents the electrical connection between nodes with evident zoning characteristics, especially the 500 kV nodes These 500 kV nodes have longer geographical distance between each other (Figure 3); they have very close electrical connection practically. Both geographical wiring layout and K-K optimal layout based on weighted topology-based model can represent the overall layout and structure of power grid from different perspectives. The former emphasizes on the regional features of electric power. L and D can reflect the loose degree of network structure
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