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Out-of-sync control method and system for back-to-back flexible direct current transmission system

A power transmission system, flexible DC technology, applied in the direction of AC network voltage adjustment, power transmission AC network, AC network with the same frequency from different sources, etc., can solve the problem of unstable power quality, low working efficiency of back-to-back flexible DC transmission systems, The power control and adjustment of both ends of the power grid is not accurate enough to achieve the effect of accurate control results and improved power quality

Active Publication Date: 2022-03-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to at least solve one of the above-mentioned technical defects, especially the inaccurate control and adjustment of the power grid power at both ends in the prior art, resulting in low working efficiency of the back-to-back flexible direct current transmission system and unstable power quality technical flaw

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  • Out-of-sync control method and system for back-to-back flexible direct current transmission system
  • Out-of-sync control method and system for back-to-back flexible direct current transmission system
  • Out-of-sync control method and system for back-to-back flexible direct current transmission system

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050]Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, s...

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Abstract

In the asynchronous control method and system of a back-to-back flexible direct current transmission system provided by the present invention, when the back-to-back flexible direct current transmission system is running in a steady state, according to the current operation mode of the power grid side, the parameter information corresponding to the three-phase voltage on the power grid side is extracted, In order to adjust different parameter information according to different operation modes, obtain corresponding power commands, and control the power flow direction of the back-to-back flexible DC transmission system according to different power commands; in this way, the power grids at both ends of the asynchronous interconnection can realize power mutual support, when one end When there is a power shortage, the energy of the power grid at the other end can be deployed to achieve power support, and the control results are relatively accurate, effectively improving the power quality of the entire power grid.

Description

technical field [0001] The present invention relates to the technical field of flexible direct current transmission, in particular to a method and system for asynchronous control of a back-to-back flexible direct current transmission system. Background technique [0002] Back to back flexible DC transmission system (back to back DC transmission system) is a DC transmission system with zero transmission line length. This system also has the compensation function of reactive power while transmitting active power, especially suitable for new energy access, multi-terminal DC system networking, asynchronous grid interconnection and other applications. [0003] This type of direct current transmission is mainly used for networking or power transmission between two asynchronous AC power systems. The magnitude and direction of the exchanged power between the connected grids are quickly and conveniently controlled by the control system. In this way, when one of the asynchronously in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/16H02J3/36
CPCH02J3/06H02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 许树楷邹常跃赵晓斌杨双飞冯俊杰卢毓欣辛清明
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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