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Flexible low-frequency power transmission system synchronization check switching-on grid-connected method and device

A power transmission system, low frequency technology, applied in the field of flexible low frequency power transmission system checking synchronous closing and grid connection, can solve problems such as cost increase, achieve high utilization rate, flexible checking method and strong adaptability

Pending Publication Date: 2022-07-12
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

[0004] The low-frequency side of the low-frequency transmission system is equipped with a low-frequency voltage transformer, which needs to be customized separately. Compared with the traditional power-frequency voltage transformer, the cost is increased. Therefore, it is necessary to study a flexible low-frequency transmission system. Quantity, reduce the cost of transmission system, and promote engineering application

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  • Flexible low-frequency power transmission system synchronization check switching-on grid-connected method and device
  • Flexible low-frequency power transmission system synchronization check switching-on grid-connected method and device

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Embodiment Construction

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other st...

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Abstract

The invention discloses a synchronization detection closing grid-connected method and equipment for a flexible low-frequency power transmission system. The method comprises the following steps: disconnecting all switches of a grid-connected converter station; switching on a power frequency network side switch and a power frequency valve side switch of the grid-connected converter station, and charging a capacitor in the converter; in response to the fact that the capacitor voltage of the converter is stable, unlocking the converter, and controlling the low-frequency side to reach the rated voltage; in response to the fact that the capacitor voltage mean value and the low-frequency side voltage of the converter reach rated values, if a low-frequency bus side voltage transformer detects no voltage, a low-frequency valve side switch and a low-frequency network side switch are directly switched on for grid connection; if the low-frequency bus side voltage transformer detects voltage, the low-frequency valve side switch is directly switched on, then the low-frequency network side switch is detected to be switched on synchronously for grid connection, or the low-frequency network side switch is directly switched on, then the low-frequency valve side switch is detected to be switched on synchronously for grid connection. According to the invention, the number of low-frequency voltage transformers is reduced, the cost and complexity of the system are reduced, and engineering application is promoted.

Description

technical field [0001] The invention relates to the field of low-frequency or frequency-divided power transmission, in particular to a method and equipment for synchronizing, closing, and connecting to the grid for a flexible low-frequency power transmission system. Background technique [0002] The traditional high-voltage transmission technology adopts the method of increasing the voltage and reducing the current to achieve the purpose of improving the transmission efficiency and increasing the transmission capacity and distance, while the innovative low-frequency or frequency division transmission technology has the above advantages by reducing the transmission frequency. Expansion and reconstruction of old lines and long-distance power transmission have huge application potential. [0003] The low-frequency power transmission system is composed of multiple converter stations connected in parallel. A single converter station converts the power-frequency alternating curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/34
CPCH02J3/34Y02E60/60
Inventor 潘武略钱政旭方愉冬曹文斌裘鹏裘愉涛戚宣威吴俊吴佳毅王松陈明方芳孙文文陆立文朱海勇林艺哲邱德锋潘磊吴小丹邹强董云龙
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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