Research On Comprehensive Evaluation Of Power Grid Operation Economy Based On Security Classification

With the energy revolution progressing,electrical energy has promoted the main energy for social progress.Therefore,the security of grid operation has an important impact on the stable development of society.Due to the continuous increase in electricity consumption,the size of the power grid is also increasing,and the difficulty in analyzing and monitoring the security of the power grid is increasing.It is necessary to conduct a zoning study on the large power grid.With the reform of the power market,the power companies have paid more and more attention to the economical operation of the power grid.Companies have taken economic interests as an important development goal of the company.Therefore,a comprehensive and comprehensive analysis of the security and economy of the power grid is required to improve the economy under the premise of ensuring the safe and stable operation of the power grid.This article analyzes and studies the security and economics of the power grid.The main tasks are as follows:First of all,in order to avoid "dimensional disasters" in the security analysis and calculation of large-scale power grids,this paper uses the N-k contingencies method to partition the power grid,and fully considers the grid network structure and operation status for the security of the grid.There are important factors.This method divides the connected partial grids that meet the same security check into the same zone,and analyzes the coupling relationships of each node according to the topological structure diagram of the grid,and uses the coupling relationship to merge the isolated nodes and obtain the final grid zone.Then,the security level of each district grid is divided.The REI equivalent method is used to process the partition boundaries and coordinate the mutual power supply between the partitions.Combined with various security checks of the power grid,the maximum power supply capacity model was established,and the maximum power supply capacity of the power grid was obtained using the cone optimization method.According to the load margin of the power grid and the unbalanced distribution of the load,a comprehensive security index is obtained;the grid’s security level classification threshold is defined bycombining the historical data of the grid and the future development plan,and the security level of the normal operating power grid is determined according to this threshold.Divide.For partitioned grids that do not meet the N-1 contingencies,they are classified by the load of loss rate index and the threshold crossing index.Finally,in-depth study of the relationship between the security and economics of the power grid,and establish an economic evaluation index system that fully considers the security level constraints of the power grid.The evaluation of the economics of the power grid based on the grey comprehensive evaluation method based on the optimal combination weights is performed to avoid the one-sided problem caused by the traditional evaluation methods.Then analyze the evaluation results,find out the factors that affect the economic operation of the grid,and give reasonable suggestions for improving its economic operation.