AC transmission line harmonic transmission characteristic analysis method

A technology for transmission lines and transmission characteristics, which is applied in the field of harmonic transmission characteristics analysis of AC transmission lines, and can solve problems such as the inability to determine the transmission amplification law and resonance frequency characteristics of the first and last harmonic voltage and current of half-wavelength lines

Active Publication Date: 2018-06-01
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a method for analyzing the harmonic transmission characteristics of an AC transmission line to solve the problem that...

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  • AC transmission line harmonic transmission characteristic analysis method
  • AC transmission line harmonic transmission characteristic analysis method
  • AC transmission line harmonic transmission characteristic analysis method

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Embodiment 1

[0024] In this embodiment, a method for analyzing the harmonic transmission characteristics of an AC transmission line is provided, figure 1 It is a flowchart of a method for analyzing harmonic transmission characteristics of an AC transmission line according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0025] S101: Obtain the frequency factor according to the transmission equation of the transmission line two-port network, where the frequency factor is the product of the phase shift constant of the transmission line and the line length.

[0026] specifically, figure 2 is the UHV AC interconnection system model according to the embodiment of the present invention, and its frequency equivalent model is as follows image 3 As shown, when the voltage at the sending end is known at frequency f and current , the voltage at the distance from the sending terminal l electric current The two-port network of ...

Embodiment 2

[0068] The embodiment of the present invention also provides a computer-readable storage medium, where the computer-executable instruction is stored in the computer-executable instruction, and the computer-executable instruction can execute the method for analyzing the harmonic transmission characteristics of an AC transmission line in any of the above method embodiments . Wherein, the storage medium can be a magnetic disk, an optical disk, a read-only memory (Read-OnlyMemory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (FlashMemory), a hard disk (Hard Disk Drive) , abbreviation: HDD) or a solid-state hard drive (Solid-State Drive, SSD), etc.; the storage medium may also include a combination of the above-mentioned types of memory.

Embodiment 3

[0070] Figure 4 It is a schematic diagram of the hardware structure of the computer equipment of the method for analyzing the harmonic transmission characteristics of the AC transmission line according to the embodiment of the present invention, as shown in Figure 4 As shown, the device includes one or more processors 410 and memory 420, Figure 4 A processor 410 is taken as an example.

[0071] The device for implementing the method for analyzing the harmonic transmission characteristics of an AC transmission line may further include: an input device 430 and an output device 440 .

[0072] The processor 410, the memory 420, the input device 430 and the output device 440 may be connected via a bus or other means, Figure 4 Take connection via bus as an example.

[0073] The processor 410 may be a central processing unit (Central Processing Unit, CPU). The processor 410 may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP)...

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Abstract

The invention provides an AC transmission line harmonic transmission characteristic analysis method. The method comprises steps: according to a two-port network transfer equation of the transmission line, a frequency length factor is obtained, wherein the frequency length factor is the product of the phase shift constant and the length of the transmission line; a harmonic transmission model is obtained by using system operation parameters and the frequency length factor; and according to the harmonic transmission model, the harmonic transmission characteristics of a half-wavelength transmission line are obtained. Through the AC transmission line harmonic transmission characteristic analysis method provided in the invention, the harmonic transmission characteristics of the front end and thetail end of the half-wavelength line can be qualitatively and quantitatively analyzed, and the problems that the existing harmonic transmission characteristic analysis method can not determine the harmonic voltage of the half-wavelength line, the current front-tail end voltage transmission amplification law and the resonant frequency characteristics can be solved.

Description

technical field [0001] The invention relates to the technical field of AC transmission harmonic analysis, in particular to a method for analyzing the harmonic transmission characteristics of an AC transmission line. Background technique [0002] Half-wavelength AC power transmission refers to the long-distance three-phase AC power transmission technology whose transmission distance is close to a power frequency half-wave. Compared with traditional AC power transmission methods, half-wavelength power transmission has the characteristics of strong power transmission capacity, good voltage stability, and remarkable economy. It has a good application prospect for ultra-long-distance power transmission. However, as a large number of new energy sources represented by wind power are connected to the power grid, the transmission of harmonics generated by inverter devices on ultra-long-distance transmission lines may cause serious harmonic problems. At the same time, interharmonics g...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 谈萌王同勋冯丹丹
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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