The Comprehensive Assessment Of The Power Loss Reduction Measures Of 750kV EHV Grid

In the rapid development of the power system, the scale and the total power generation of the power system is increasing year by year. Many countries are giving increasing weight to the study of loss reduction of energy saving. As an important part of smart and strong grid in the future, there are not only breakthoughs in the field of theoretical research of EHV network, but also undertaking an increasingly important transmission task in the operation of power system. Among them,750kV grid, the most significant voltage EHV power grid, has distinctive features and the obvious differences with 330kV below power grid. Besides,750kV grids are mostly in remote areas, away from load center, undertaking the task of large-scale, long-distance transmission of electric energy. Therefore, it’s of great significance to analysis the power loss of 750kV grid and to assess the loss reduction.In this paper, firstly, we establish the model of 750kV comprehensive grid loss. Based on the characteristic of 750kV grid, we establish the corona, harmonic loss model and obtain the comprehensive loss model of 750kV grid. Secondly, we analysis the effects of 750kV power grid’s different component loss reduction. And we get a series of measures related to the effects to reduce the loss. Thirdly, in view of the problem that the effect of 750kV loss reduction scheme is biased if it is evaluated directly by addition method, we propose a fuzzy comprehensive evaluation method to make the assessment result of the scheme more objective. Finally we use the typical operation mode of Gansu power grid for simulation calculation, the result of which proves the feasibility and effectiveness of the theory.Through the method for evaluating the loss reduction measures proposed in this paper, we can evaluate the effect of the loss reduction scheme, while taking the influence on power system static security and economic operation into account. The result is meaningful to improve the safety and economy of 750kV grid, at the same time providing ideas to analysis EHV power grid loss.