Design of power supply network based on 500/110 kv for load center and comprehensive accessibility evaluation

Growing electric power demand and the consumption of large-scale renewable energy require a more efficient power supply network, with less occupied areas in load centers. In this paper, application principles of power supply network based on 500/110 kV direct transformation are proposed. An in-depth analysis of the grid structure and substation design is presented along with an application scenario. An accessibility index based on power flow tracing for network evaluation is also proposed. The index is able to present the inner connectivity and power transferability of a power network. A comprehensive evaluation of traditional short circuit, load flow, N-1, economic calculation, and the accessibility index are conducted on the power grid planning of a high-tech industrial park in Wuhan, China. Finally, electric feasibility and reliability are validated, and accessibility and construction investments compared.