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Method for improving stability of doubly-indeed DC system

A DC system, double-feed technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as AC bus voltage fluctuations, and achieve the effect of improving operating characteristics

Active Publication Date: 2013-01-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for improving the stability of the double-infeed DC system, which is used to solve the mutual influence of the two-circuit DC subsystems of the existing double-infeed DC system, and the failure of the AC side of the local DC subsystem will cause the other The Problem of Voltage Fluctuation of AC Bus in Primary DC Subsystem

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  • Method for improving stability of doubly-indeed DC system
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  • Method for improving stability of doubly-indeed DC system

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Embodiment Construction

[0022] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0023] figure 1 It is a schematic diagram of the structure of a double-fed DC system with different landing points including a static synchronous compensator subsystem. In this embodiment, the two grid-commutated high-voltage DC subsystems of the double-infeed DC system are respectively denoted as the first grid-commutated high-voltage DC subsystem LCC-HVDC 1 And the second grid commutation HVDC subsystem LCC-HVDC 2 . Such as figure 1 As shown, the static synchronous compensator subsystem STATCOM is added to the double-infeed DC system, and the static synchronous compensator subsystem STATCOM and any one of the two grid-commutated HVDC subsystems are directly connected in parallel to the same AC bus. Without loss...

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Abstract

The invention discloses a method for improving the stability of a doubly-indeed DC system in the technical field of monitoring and control of high-voltage DC transmission lines. The method comprises the following steps of: additionally arranging a static synchronous compensator subsystem in the doubly-indeed DC system, connecting the static synchronous compensator subsystem and a line-commutated-converter high-voltage DC subsystem of any one of two line-commutated-converter high-voltage DC subsystems to the same AC busbar in parallel and then connecting AC busbars of the two line-commutated-converter high-voltage DC subsystems by using impedance equivalent to a set electric distance. According to the method disclosed by the invention, the static synchronous compensator subsystem is accessed to the AC busbar of one DC subsystem inverter station of the doubly-indeed DC system with different points of fall, and the operation characteristics of the doubly-indeed DC system with different points of fall is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission line monitoring and control, and in particular relates to a method for improving the stability of a double-infeed direct current system. Background technique [0002] Line-Commutated-Converter High Voltage Direct Current (LCC-HVDC) technology has been widely used in long-distance power transmission, asynchronous networking, and submarine power transmission. As of August 2012, there are 20 LCC-HVDC projects that have been completed and put into operation in my country. LCC-HVDC converters use thyristors as commutation elements, and the operation of LCC-HVDC requires the commutation current provided by the AC system, so that the reliability of LCC-HVDC operation is affected by the AC grid at both ends. Therefore, in order to commutate reliably, the AC system on the inverter side of LCC-HVDC must have sufficient strength. [0003] With the full implementation of the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
Inventor 赵成勇张岩坡倪俊强郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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