Power transmission control method and flexible direct current transmission device

A technology of flexible direct current transmission and control methods, which is applied in the direction of electric power transmission AC network, emergency treatment AC circuit layout, etc., can solve problems such as overcurrent and current increase of flexible direct current transmission devices, and achieve the effect of avoiding overcurrent damage

Active Publication Date: 2020-01-14
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this period of Δt, that is, the time when the valve control has no time to act, the current of the flexible direct current transmission device will increase or over-current

Method used

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  • Power transmission control method and flexible direct current transmission device
  • Power transmission control method and flexible direct current transmission device
  • Power transmission control method and flexible direct current transmission device

Examples

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Embodiment Construction

[0072] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0073] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0074] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific implementation manners. It will be understood by those skilled in the art that the present disclosure may be practiced without some of the specific details. In some instances, methods, means, componen...

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Abstract

The disclosure relates to a power transmission control method and a flexible DC power transmission device. The method is applied to a flexible DC power transmission device and includes the steps of obtaining an AC voltage value at an outlet of the device and currents at a plurality of locations inside the device; determining a pulse state of the device according to a bridge current among the currents at the plurality of locations; if the AC voltage value is less than or equal to a voltage threshold value, determining whether the device satisfies an intra-area fault condition according to the currents at the plurality of locations; and if the device does not satisfy the intra-area fault condition and the pulse state of the device is in an unlocked state, controlling the device to implement a low-voltage ride-through strategy. According to the embodiment of the disclosure, it is possible to determine whether an intra-area fault occurs when the AC voltage value drops to the voltage threshold, and to implement the low-voltage ride-through strategy when it is determined no intra-area fault occurs and the pulse state of the device is the unlocked state, so that the subarea identification of a fault of a flexible DC power transmission system can be realized and the over-current damage to internal modules of the power transmission device can be avoided.

Description

technical field [0001] The present disclosure relates to the technical field of power electronic control, in particular to a power transmission control method and a flexible direct current transmission device. Background technique [0002] Flexible DC transmission technology is a high-voltage direct current transmission (VSC-HVDC) technology based on voltage source converters. This power transmission technology has the advantages of independent adjustment of active and reactive power, no need for large-capacity reactive power compensation and filters, no commutation failure, and the receiving end can be connected to passive systems. It is mainly used in new energy power generation system networking, asynchronous Application scenarios such as grid connection. [0003] In related technologies, when the flexible direct current transmission system is connected to the active grid, at the moment of the voltage drop of the receiving end grid, especially the three-phase metallic gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 陈朝晖梅红明丁晓兵文晶李捷陈莉李正红刘斌邱建张海棠田庆黄辉
Owner CHINA SOUTHERN POWER GRID COMPANY
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