Current-limiting resistor-capacitor branch circuit, resistor-capacitor type direct current circuit breaker and control strategy

A resistance-capacitance, branch-circuit technology, used in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Conducive to rapid recovery, improved stability and reliability

Active Publication Date: 2019-03-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the high manufacturing cost of hybrid DC circuit breakers, this will greatly reduce the economics of the protection scheme

Method used

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  • Current-limiting resistor-capacitor branch circuit, resistor-capacitor type direct current circuit breaker and control strategy
  • Current-limiting resistor-capacitor branch circuit, resistor-capacitor type direct current circuit breaker and control strategy
  • Current-limiting resistor-capacitor branch circuit, resistor-capacitor type direct current circuit breaker and control strategy

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Embodiment Construction

[0045]In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0046] like Figure 1-2 As shown, the present invention proposes a resistance-capacitance DC circuit breaker suitable for flexible DC transmission systems, including a current-carrying breaking branch, a current-limiting resistance-capacitance branch: a current-carrying breaking branch is routed by an ultra-fast mechanical switch UFD, a current transfer switch LCS is formed in series; the current-limiting resistance-capacitance branch includes a fully-controlled switch first switch T 1 , the second switch T 2 , capacitor C, resistor R 1 , R 2 , R 3 , where T 1 , R 1 , C in series, R 2 Connected in parallel at both ends of C, T 2 , R 3 Connected in parallel at both ends of C after being connected in series, T 1 , T 2 Arr...

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Abstract

The invention discloses a current-limiting resistor-capacitor branch circuit, a resistor-capacitor type direct current circuit breaker and a control strategy which are suitable for a high-voltage direct current electric power transmission system. The current-limiting resistor-capacitor branch circuit comprises a first sub-circuit and a second sub-circuit; and on the basis of the current-limiting resistor-capacitor branch circuit, a current-carrying disconnection branch circuit is increased to form the resistor-capacitor type direct current circuit breaker provided by the invention. Meanwhile,the new control strategy is provided for the resistor-capacitor type direct current circuit breaker. Through the current-limiting resistor-capacitor branch circuit, the resistor-capacitor type directcurrent circuit breaker and the control strategy, after a direct current line goes wrong, an over-current of a direct current can be inhibited, a direct current voltage can be stabilized, the breakingcapacity is strong, and the stability and reliability of an alternating current and direct current system are improved.

Description

Technical field [0001] The invention relates to the field of high-voltage direct current transmission, and in particular to a current-limiting resistance-capacitance branch, a resistance-capacity DC circuit breaker and a control strategy. Background technique [0002] The flexible DC transmission system (voltage source converter based high voltage direct current, VSC-HVDC) based on voltage source converter has significant advantages in solving the problem of new energy consumption. However, due to the weak overcurrent and overvoltage capabilities of the power electronic equipment in the flex-direct system, and the low impedance characteristics of the DC side, the short-circuit fault current rise rate is larger. Therefore, the flex-direct system has higher protection requirements for quick action and selectivity than AC. The system is higher and needs to complete a full set of actions such as cutting off and clearing the fault current within a few milliseconds to prevent the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H7/26
CPCH02H7/262H02H9/02
Inventor 王渝红王媛曾琦刘程卓傅云涛凌楠曾淑殷华石富童
Owner SICHUAN UNIV
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