Extra-high-voltage alternating current and direct current transmission mode applicability selecting method and device using same

Abstract

The invention relates to an extra-high-voltage alternating current and direct current transmission mode applicability selecting method and a device using the same. The method includes the steps: firstly, determining index parameters of an extra-high-voltage direct current transmission mode; secondly, establishing alternative schemes for extra-high-voltage transmission modes according to a power transmission scale and establishing a simulation model according to power transmission requirements and conditions of a power grid system; thirdly, calculating the index parameters in the alternative schemes in the second step according to the simulation model; fourthly, determining integrated weight according to the calculated index parameters in the alternative schemes in the third step; and fifthly, performing comprehensive optimization according to the determined index parameters in the alternative schemes in the fourth step based on fuzzy optimization to determine the optical transmission scheme in the alternative schemes. A penalty function is brought into an index calculation process, the requirement of indexes on safety feature can be more effectively met, the problem of multi-objective decision is converted into the problem of sequential decision for a unit system in a multilevel multi-objective level model, the problem of engineering evaluation is theorized, and analysis results are visual and persuasive.

Description

technical field [0001] The invention relates to a method and a device for selecting an applicable transmission mode, in particular to a method for selecting an applicable selection for an UHV AC / DC transmission mode and a device thereof. Background technique [0002] UHV DC and AC have the technical advantages of long-distance and large-capacity transmission, which is conducive to saving transmission corridors, reducing line losses, and improving transmission capacity, and can meet the requirements of large-scale cross-regional transmission in my country in the future. Since AC transmission and DC transmission have different transmission characteristics, for example, AC has a network function and can flexibly collect, transmit and distribute power, which requires the coordination and cooperation of AC grids at various voltage levels, and when the grid structure is stronger, the power it transmits The larger the DC is, the point-to-point transmission method requires reasonabl...

AI Technical Summary

Problems solved by technology

For example, although some studies have put forward the scope of application of UHV AC, UHV DC and EHV AC based on the analysis of the economic transmission distance of AC and DC, the economic factors considered in the analysis are relatively single; It is proposed that UHV AC is mainly positioned for short-distance large-capacity power transmission and grid construction of a higher voltage level, and UHV DC is mainly positioned for long-distance large-capacity power transmission with a clear relationship between sending and receiving, and the interconnection between some large-scale and provincial networks. Although the two principles complement each other and complement each other, they have certain guiding significance, but the conclusion is not clear, no effective evaluation method can be proposed, and it is impossible to guide the actual UHV planning

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