The Local-World Evolving Network Model for Power Grid Considering Different Voltage Levels

摘要

An evolving network model reflecting the actual characteristics of power grid plays an important role in studying power grid structure and assessing vulnerability. It is difficult to describe the hierarchical design and control operation based on voltage levels in actual power grids by applying directly complex network theory models. Therefore, the local-world evolving network model for power grid considering different voltage levels is proposed, in which the voltage factor is induced to divide network nodes into different voltage levels and make the nodes connect to the grid according to different voltage. The node degree distribution in the model has power-law tail characteristics, and its scaling exponent is between 3 and ∞. This is consistent with the characteristics of the actual power grid. The results of numerical simulations for the western US power grid and China Southern Power Grid indicate that the new model is more consistent with the actual power grid in degree distribution and reflecting perfectly the essential evolution mechanism of power grid.