Evaluation Method for Power Supply Scheme of 500kV Substation in Regional Power Grid

The power grid load develops rapidly and fluctuates greatly. By optimizing the operation scheme of the transmission network, the operation security and stability of the power grid and the power supply capacity of the grid are improved. In this paper, the limit transmission capacity and the security control current of the transmission line, and the security control current of the current transformer, and the control current of the interval conductor line in the substation are considered in the actual operation of the power grid. Under the condition that the interval conductor line in the substation is replaced to improve the limit transmission capacity of the transmission line, the overload capacity of the main transformer in the 500kV substation is considered. Then, an objective function is established to evaluate different operation schemes under a given operation mode to select the optimal scheme and improve the power supply capacity of the regional power grid. Finally, a provincial regional power grid is used to verify the effectiveness and adaptability of the proposed method.