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Convertor station containing resistance type superconducting current limiter and direct current circuit breaker, and direct current fault processing strategy thereof

A DC circuit breaker and superconducting current limiter technology, which is applied in the direction of power transmission AC network, emergency protection circuit device, electrical components, etc., can solve the commutation failure of the inverter side system, the interruption of DC transmission power, the occupation Large ground area and other problems, to achieve the effect of solving the requirements of too long recovery time and reducing the breaking current

Active Publication Date: 2019-04-19
STATE GRID JIANGSU ECONOMIC RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, decades of operating experience have shown that it has the following insurmountable inherent defects: (1) LCC needs to rely on AC power for commutation during the commutation process, but new energy power plants such as wind power and photovoltaics do not It has the ability to provide AC power, so this directly limits the application of LCC-HVDC technology in many new energy grid-connected occasions
(2) Similarly, due to the excessive sensitivity of LCC to AC voltage, the inverter side system at the receiving end is prone to commutation failure, resulting in a large amount of DC transmission power interruption; in the case of multiple infeeds, multiple DC lines simultaneously Commutation failure will cause serious power flow transfer, which directly threatens the safe and stable operation of the system
(3) LCC-HVDC technology needs to configure a large reactive power compensation device and a complex filter, which results in a large area of ​​the converter station and difficult site selection
According to the different impedance characteristics of the current limiter after the fault, the superconducting current limiter can be divided into two categories: resistive and inductive. Under the current technical conditions, the resistive current limiter relies on its small size and simple structure , has the most potential to be applied to flexible DC systems; although inductive current limiters have a faster recovery time, they have the disadvantages of large volume and complex structure, and are only used in AC systems

Method used

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  • Convertor station containing resistance type superconducting current limiter and direct current circuit breaker, and direct current fault processing strategy thereof
  • Convertor station containing resistance type superconducting current limiter and direct current circuit breaker, and direct current fault processing strategy thereof
  • Convertor station containing resistance type superconducting current limiter and direct current circuit breaker, and direct current fault processing strategy thereof

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] In the converter station of the present invention, which contains a resistive superconducting current limiter and a DC circuit breaker, the positive DC outlet line and the negative DC outlet line of the converter station first need to be connected to the positive DC bus bar and the negative DC bus bar respectively through mechanical switches; Both the busbar and the negative DC busbar need to pass through a smoothing reactor, a DC circuit breaker, and a resistive superconducting current limiting device, and then be connected to the positive and negative DC lines respectively.

[0047] As shown in Figure 1(a), when the converter station adopts a true bipolar structure, both positive and negative poles have independent converters, and the converters a...

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Abstract

The invention discloses a convertor station containing a resistance type superconducting current limiter and a direct current circuit breaker, and a direct current fault processing strategy thereof. According to the technical scheme, a high-resistance characteristic of a superconducting current limiter after failure is utilized, breaking capacity of the direct current circuit breaker under prior art conditions can be fully exerted, and requirements for breaking current of the direct current circuit breaker in a multi-terminal flexible direct-current power grid are reduced. Meanwhile, a problemthat recovery speed of the resistance type superconducting current limiter is too low is solved by using a direct current fault restart protection module and a superconducting current limiter bypassprotection module, so that quick restart of a system after direct current faults becomes possible. In addition, a set of complete direct-current fault processing and restarting recovery strategy are provided aimed at the converter station containing the resistance type superconducting current limiter and the direct current circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission and distribution, and in particular relates to a converter station including a resistive superconducting current limiter and a DC circuit breaker and a DC fault processing strategy thereof. Background technique [0002] There are contradictions in geographical conditions between my country's energy production and demand, and it is necessary to transmit electric energy from energy-sparse areas to load-intensive areas through "west-to-east power transmission" and "north-to-south power transmission". So far, the high-voltage DC transmission system (Line Commutated Converter based HVDC, LCC-HVDC) based on grid commutated converters has become the main way of long-distance large-capacity DC transmission. However, decades of operating experience have shown that it has the following insurmountable inherent defects: (1) LCC needs to rely on AC power for commutation during the commutati...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02H7/26
CPCH02H7/268H02J3/36Y02E60/60
Inventor 孙建龙韩笑李妍王庭华曹程杰储方舟缪芸徐政张哲任徐雨哲
Owner STATE GRID JIANGSU ECONOMIC RES INST
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