Method for acquiring alternating-current and direct-current transmission application range

Abstract

The invention relates to a method for acquiring an alternating-current and direct-current transmission application range. The method includes building various alternating-current and direct-current transmission models with high-voltage grades from a power source to a receiving-end power grid under the condition of given transmission distances and transmission capacity; creating a comprehensive evaluation index system of an alternating-current and direct-current transmission mode with consideration of various factors such as power transmission characteristic, electromagnetic environmental characteristic and economical efficiency on the basis of the alternating-current and direct-current transmission models; and combining the alternating-current and direct-current transmission models by the aid of a comprehensive optimization process on the basis of the optimal combined weight and comprehensively optimizing the alternating-current and direct-current transmission mode in a plurality of groups of typical transmission scenes to acquire the application range of the alternating-current and direct-current transmission mode by means of summarization. The method has the advantages that the method has high reference value for constructing a future power grid, and particularly provides reference for selecting outgoing transmission modes for various major energy bases.

Description

technical field [0001] The invention relates to a method for selecting the applicable range of power transmission, in particular to a method for obtaining the applicable range of AC and DC power transmission. 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. AC transmission and DC transmission have different technical characteristics. AC has a network function, which can flexibly collect, transmit and distribute power, and requires the coordination and cooperation of various voltage levels; the stronger the grid structure, the greater the transmission capacity. DC is a point-to-point power transmission method. It is necessary to choose a reasonable voltage level according to the transmission...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many researches on the scope of AC and DC transmission in China, and some achievements have been made, which have certain guiding significance for the construction of my country's power grid, but there are also shortcomings such as lack of systematic methods and unclear conclusions.

According to the analysis of the economic transmission distance, some studies have proposed the scope of application of UHV AC, UHV DC and EHV AC, and the considerations are relatively simple; some literatures have proposed that UHV AC is mainly positioned at short-distance large-capacity transmission and more For grid construction with a higher voltage level, 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 regions and provincial grids. The two complement each other and complement each other, which has certain guiding significance. However, the conclusion is not clear, no effective evaluation method can be proposed, and it is unable to guide the planning and selection of specific power grid transmission methods in the future.

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