Control method and control device for ground fault in valve area of ​​UHVDC low-end converter

A UHV DC and control method technology, which is applied in the direction of emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve problems such as more fault current flowing through fault points, transformer DC bias, loss, etc., to avoid The effect of DC transmission power

Active Publication Date: 2021-10-01
NR ELECTRIC CO LTD +1
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  • Claims
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Problems solved by technology

[0005] The existing technology mainly has the following problems: After blocking the entire DC pole, a large current will flow through the ground pole line, which will easily cause DC bias in the transformer in the nearby substation, causing the transformer to saturate; after blocking the entire DC pole, if the transmission power Larger, more DC power will be lost; after blocking the entire DC pole, more fault current will flow through the fault point

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  • Control method and control device for ground fault in valve area of ​​UHVDC low-end converter
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  • Control method and control device for ground fault in valve area of ​​UHVDC low-end converter

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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0035] It should be understood that the terms "first", "second", "third", and "fourth" in the claims, description and drawings of the present application are used to distinguish different objects, rather than to describe a specific order . The term "comprising" used in the description and claims of this application indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude one or more other features, integers, st...

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Abstract

This application provides a control method and a control device for a ground fault in a valve area of ​​an UHV DC low-end converter. The control method and control device are applied to low-end converters of DC poles of UHVDC power transmission systems, and the UHVDC power transmission system includes double DC poles, and the DC poles include at least two converters connected in series , the low-end converter is a converter close to the pole-neutral busbar. When the UHVDC transmission system operates with two DC poles and the DC pole where the low-end converter is located operates with all valve groups, and detects When a ground fault occurs in the valve area of ​​the low-end converter, the control method includes: controlling the low-end converter to block; controlling the DC currents of the two DC poles of the UHVDC transmission system to be equal; isolating the Low-end inverters; inverters other than said low-end inverter continue to operate.

Description

technical field [0001] The application relates to the technical field of high-voltage direct current transmission, in particular to a control method and a control device for a ground fault in a valve area of ​​a UHV direct current low-end converter. Background technique [0002] The UHV DC transmission system generally uses two converters in series to form a DC pole. According to existing projects, it is divided into conventional UHV DC transmission system, layered access UHV DC transmission system and hybrid UHV DC transmission system. [0003] The conventional UHV DC transmission system is a DC pole, the high-end and low-end converters are both grid-commutated converters, and they are connected to the same AC grid. The high-end and low-end converters connected to the UHVDC transmission system in layers are both grid-commutated converters, and are respectively connected to two different AC grids. The hybrid UHV DC transmission system is divided into two types: inter-statio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 卢东斌赵森林李海英
Owner NR ELECTRIC CO LTD
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