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Half-wavelength alternating-current power transmission system, tuning method thereof and flexible grid connection method

A technology of power transmission system and AC system, which is applied in the field of flexible grid connection, can solve problems such as the technical and economical deterioration of VFT schemes, and achieve the effects of avoiding line overvoltage restrictions, increasing transmission capacity, and realizing flexible grid connection

Inactive Publication Date: 2020-08-21
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frequency variation range based on the VFT scheme is small, and the application scenarios are limited, and the frequency conversion transformer needs to absorb reactive power to establish a magnetic field. further deterioration

Method used

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  • Half-wavelength alternating-current power transmission system, tuning method thereof and flexible grid connection method
  • Half-wavelength alternating-current power transmission system, tuning method thereof and flexible grid connection method
  • Half-wavelength alternating-current power transmission system, tuning method thereof and flexible grid connection method

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Embodiment 1

[0053] Example 1, such as Figure 4-5 As shown, a half-wavelength AC power transmission system based on MMMC described in the embodiment of the present invention, the system includes a half-wavelength AC power transmission line and two MMMC frequency converters located on the input side and output side of the half-wavelength AC power transmission line Flexible tuning device; the MMMC frequency conversion flexible tuning device includes three-phase input terminals, three-phase output terminals and nine power chains connecting the three-phase input terminals and the three-phase output terminals, and each of the power chains includes N stages The H-bridge sub-module connected together and at least one reactor; the input side of the half-wavelength AC transmission line is connected to the three-phase output end of a MMMC frequency conversion flexible tuning device, and the output side of the half-wavelength AC transmission line is connected to a MMMC frequency conversion flexible t...

Embodiment 2

[0060] Embodiment 2, the present invention also provides a kind of tuning method of the half-wavelength AC power transmission system based on MMMC, adjust the output voltage output to the half-wavelength AC power transmission line through the MMMC frequency conversion flexible tuning device, thereby adjust the operation of the half-wavelength AC power transmission line Frequency, so that the half-wavelength AC transmission line adopts the adjusted operating frequency for AC transmission. include:

[0061] 1. The half-wavelength AC transmission line is flexibly tuned by the MMMC frequency conversion flexible tuning device to realize the half-wavelength AC transmission line;

[0062] When the electrical distance of the transmission line to be tuned is less than a half-wavelength corresponding to the frequency of the existing power grid, adjust the output voltage of the MMMC frequency conversion flexible tuning device to the half-wavelength AC transmission line to increase the op...

Embodiment 3

[0073] Embodiment 3, the present invention also provides a method for flexible grid connection of power systems based on MMMC frequency conversion flexible tuning, using the half-wavelength AC power transmission system based on MMMC as claimed in claim 1, the method includes: placing the The MMMC variable frequency flexible tuning device on the input side of the half-wavelength AC transmission line is connected to the first system, and the MMMC variable frequency flexible tuning device positioned at the output side of the half-wavelength AC transmission line is connected to the second system; wherein the first The system is the equivalent power supply of the AC system at the sending end, and the second system is the equivalent power supply of the AC system at the receiving end; the voltages of the first system and the second system are adjusted respectively based on two MMMC frequency conversion flexible tuning devices, The frequency, amplitude, phase sequence and phase of the ...

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Abstract

The invention discloses a half-wavelength alternating-current power transmission system based on MMMC, a tuning method and a flexible grid connection method. The system comprises two MMMC frequency conversion flexible tuning devices and a half-wavelength AC power transmission line located between the two MMMC frequency conversion flexible tuning devices. Each MMMC frequency conversion flexible tuning device comprises a three-phase input end, a three-phase output end and nine power chains connected with the three-phase input end and the three-phase output end, wherein each power chain comprisesN cascaded H-bridge submodules and at least one reactor. The system has the advantages that the MMMC frequency conversion flexible tuning device tunes the operation frequency of the half-wavelength AC power transmission line, in other words, phase modulation is carried out on the half-wavelength alternating-current power transmission line, half-wavelength alternating-current power transmission isachieved, fault isolation of the half-wavelength power transmission line can be achieved, the half-wavelength power transmission line can also be operated according to a conventional alternating-current line or a direct-current line, and flexible grid connection can also be achieved.

Description

technical field [0001] The present invention relates to the technical field of half-wavelength AC power transmission, in particular to a half-wavelength AC power transmission system based on MMMC frequency conversion flexible tuning, a tuning method and a flexible grid connection method. Background technique [0002] As the international community pays more and more attention to energy security, ecological environment, abnormal climate and other issues, reducing the burning of fossil energy and accelerating the development and utilization of renewable energy have become the general consensus and concerted action of all countries in the world. The concentrated development of photovoltaic and wind power makes the transmission and implementation of ultra-long-distance and high-power electric energy have extensive significance and practical value. [0003] Half Wavelength AC Transmission (HWACT) refers to the ultra-long-distance three-phase AC transmission whose electrical dista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02H7/26
CPCH02H7/26H02J3/36H02J3/38H02J2003/365Y02E60/60
Inventor 宋晓通孙艺吕倩楠
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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