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Asynchronous-synchronous control method and system of back-to-back flexible direct-current power transmission system

A power transmission system, flexible DC technology, applied in the direction of AC network voltage regulation, power transmission AC network, AC network with the same frequency from different sources, etc. Insufficiently accurate control and regulation of power grids at both ends, to achieve the effect of accurate control results and improved power quality

Active Publication Date: 2020-11-03
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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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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  • Asynchronous-synchronous control method and system of back-to-back flexible direct-current power transmission system
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  • Asynchronous-synchronous control method and system of back-to-back flexible direct-current power transmission system

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[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

The invention provides an asynchronous-synchronous control method and system for the back-to-back flexible direct-current power transmission system. When the back-to-back flexible direct-current powertransmission system runs stably, parameter information corresponding to three-phase voltage of a power grid side is extracted according to an operation mode of the current power grid side, so that different parameter information is adjusted according to different operation modes, thus obtaining corresponding power instructions, and controlling the power flow direction of the back-to-back flexibleDC power transmission system according to different power instructions; thus, the asynchronously interconnected power grids at the two ends can achieve mutual power support; when the power of one endis insufficient, the energy of the power grid at the other end can be allocated to achieve power support, the control result is accurate, and the electric energy quality of the whole power grid is effectively improved.

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 Applications(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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