Design And Development Of Power Grid GIC Evaluation Software

With the expanding of the power grid, many grids, such as Guangdong power grid, Shandong power grid, suffered magnetic storm disasters. The measured data in these grids showed that, the level of GIC is severely affected by the magnetic storm intensity, the earth electrical structure, the network configuration and many other factors. The questions that how to evaluate power grid GIC level and how to develop a tool for GIC analysis and calculation need to be studied and solved. In order to solve these problems, the following research about GIC is finished.The generation mechanism and influence factors of GIC are illustrated and analyzed. Through comparing the advantages and disadvantages of the earth induced geoelectric field model, the model that can meet the need of practical engineering application is proposed. Then the relationships between electric and magnetic fields in uniform earth model and layered earth model are established respectively, the power grid GIC model is set up, and the formulas are deduced for the development of power grid GIC evaluation software.According to the mechanism of GIC generation, the need and the function of power grid GIC evaluation software is analyzed, the function modules, including the user manage module, the induced geoelectric field calculation module and the power grid GIC calculation module are designed, and the technology of mixed programming between Microsoft C#.NET and MATLAB is introduced.The computer realization methods of all of the functional modules are studied, the digital models of induced geoelectric field calculation and the matrix equation of GIC calculation is derived. Based on the above work, the software of power grid GIC evaluation is developed, which can calculate the power grid GIC for GIC monitoring points selection, equipment selection of planning power grid and so on.Finally, the earth model and power grid GIC model for YangHuai power transmission system are set up and the GIC level is calculated with the software of power grid GIC evaluation. The result compared with the measured data indicates that the GIC evaluation method and the software are effective.