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Line fault processing method, system and device in low-frequency power transmission system and medium

A technology for power transmission system and line failure, applied in the field of AC/AC converter, can solve the problems of system shock, loss of transmission power, adverse system stability, etc., to avoid loss, maintain system stability, and avoid the effect of double-frequency fluctuation components

Active Publication Date: 2022-02-11
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

For the traditional control strategy of MMMC, if a single-phase fault occurs in its low-frequency line, the converter will be blocked directly. Asymmetrical operation mode, under the existing control strategy, the perfect two-phase phase difference is 120°, and the double frequency pulsation of active power caused by negative sequence voltage and current components is not conducive to the stability of the system

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  • Line fault processing method, system and device in low-frequency power transmission system and medium
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  • Line fault processing method, system and device in low-frequency power transmission system and medium

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Embodiment Construction

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.

[0048] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are b...

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Abstract

The invention discloses a line fault processing method, system and device in a low-frequency power transmission system and a medium, and the method comprises the steps: determining that a fault occurs in a first phase line in a low-frequency line, and cutting off the first phase line; adjusting a second phase line and a third phase line in the low-frequency line to be in an orthogonal two-phase power transmission mode, so that an active power frequency doubling fluctuation component is avoided; wherein the low-frequency power transmission system comprises a power frequency main network and a low-frequency line, the low-frequency line is connected with the power frequency main network through an MMMC converter station, and the MMMC converter station comprises a modular multi-level matrix converter and a converter transformer. According to the invention, when a line in the low-frequency line fails, an original three-phase power transmission mode is converted into a two-phase power transmission mode, so that loss of transmission power is avoided; in addition, the phase of a sound two-phase line is adjusted, an orthogonal two-phase power transmission mode is entered, the introduction of a frequency doubling fluctuation component is avoided, and the system stability can be maintained. The method and the system can be widely applied to the technical field of AC / AC converters.

Description

technical field [0001] The invention relates to the technical field of AC / AC conversion, in particular to a processing method, system, device and medium for line faults in a low-frequency power transmission system. Background technique [0002] Voltage and frequency are the two most important parameters of AC electrical energy. Since the invention of the transformer, from power generation, transmission to power consumption, people can choose different voltage levels according to their needs, which has achieved the purpose of improving efficiency and facilitating use. But the frequency has not been fully utilized, it can only be 50Hz or 60Hz. If different frequencies can be used in power generation, transmission, and power consumption, it may bring huge benefits; for example, if a lower frequency is used for long-distance power transmission, the transmission capacity of the line can be greatly improved; if a higher frequency is used to Using electric energy can significantl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 刘沈全王钢苏匀李少华姚东晓
Owner SOUTH CHINA UNIV OF TECH
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