Extra-high voltage alternating current drop point output project optimal selection method

Abstract

The invention provides an extra-high voltage alternating current drop point output project optimal selection method, and includes the steps of: preliminarily determining an extra-high voltage alternating current drop point 500kV transformer station range through balance of electric power and electric quantity, and preliminarily screening drop point 500kV transformer stations by evaluating influence on 500kV bus short-circuit current of a near region after an extra-high voltage drop point; based on the scale of extra-high voltage transmitting power, forming an extra-high voltage alternating current drop point output project scheme set, and further screening output project schemes by evaluating influence of each scheme on 1000 and 500 kV bus short-circuit current of extra-high voltage transformer stations; and determining a 500kV output project optimal selection scheme through short-circuit current and safety and stability checks. The extra-high voltage alternating current drop point output project optimal selection method provided by the invention can effectively remove unreasonable drop out output schemes by evaluating interactive influence of an extra-high voltage power grid and 500kV power grid short-circuit current of a near region, remarkably reduces unnecessary calculation workloads, the schemes have clear and definite directivity, and thus a reasonable extra-high voltage alternating current drop point output project scheme can be rapidly determined.

Description

technical field [0001] The invention belongs to the field of safety and stability analysis of electric power systems, and in particular relates to an engineering optimization method for UHV AC landing point transmission. Background technique [0002] At present, my country's power grid has formed a North China-Central China AC interconnected power grid, and the East China Power Grid operates in isolation, and is connected to the North China-Central China Power Grid through a DC system. According to the plan, my country will build dozens of UHV DC projects in the next 10-20 years, and gradually form a UHV AC-DC hybrid power grid to supply power to the central and eastern load centers through UHV DC and AC systems. The selection of UHV AC landing point has become a key technology for the coordinated development of 1000 / 500kV power grid. [0003] At present, the selection of UHV AC drop point transmission projects mainly adopts engineering experience methods. First, several gr...

AI Technical Summary

Problems solved by technology

On the whole, the current selection method for the UHV AC drop point transmission project is still too extensive, and the organization and system are relatively insufficient

And with the rapid development of the power grid, the trend direction, short-circuit current level, safety and stability characteristics, etc. may all undergo major changes. It is difficult to adapt to the recent and mid-term changes in the complex changes of the power grid only relying on local experience for the selection of UHV AC drop point transmission projects. long-term comprehensive demand

Images