The force-dynamic relation study between security and efficiency of power grid based on the evaluation model

In order to analyze the correlation between security and efficiency of power grid, the representative index had been selected, which contained N-1 pass ratio, the power outage risks and the transformer load ratio. The grid evolution model was proposed to simulate the development of power grid under certain rules in this paper, and the force-dynamic relation between the security and efficiency of electrical power grid based on simulated data during in developing process. The result shows that the relationship between the security and efficiency is increasing exponential function. The reasonable load ratio of transformer is presented for the power grid under a demanded security requirement.