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Flexible direct-current power grid fault line isolation method, protection device and system based on direct-current circuit breaker proactive and preactive

A technology of DC circuit breaker and protection device, applied in emergency protection circuit device, power transmission AC network, electrical components, etc., can solve problems such as long fault detection time, close-end converter valve blocking, damage to main equipment power electronic devices, etc. , to achieve the effect of ensuring sound and continuous reliable operation, reducing blocking and reducing action time

Pending Publication Date: 2022-07-29
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the transmission time of the protection action command can be shortened by the principle of local protection, the sum of the relatively long fault detection time and the DC circuit breaker breaking operation time may also cause the near-end converter valve to be blocked, and even the power electronic devices of the main equipment may be blocked. damage

Method used

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  • Flexible direct-current power grid fault line isolation method, protection device and system based on direct-current circuit breaker proactive and preactive
  • Flexible direct-current power grid fault line isolation method, protection device and system based on direct-current circuit breaker proactive and preactive
  • Flexible direct-current power grid fault line isolation method, protection device and system based on direct-current circuit breaker proactive and preactive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 as well as image 3 As shown, the present invention provides a method for isolating a fault line of a flexible DC power grid based on the proactive action of a DC circuit breaker, comprising the following steps:

[0044]Step 1: After the DC line protection system is started, collect the positive and negative voltage and current data before and after the protection start time, and construct a "data window" for fault line identification. In this embodiment, the fault line is identified by using the positive and negative voltage and current data before and after the protection start time. In other feasible embodiments, other situations or types of line data can be selected, and mature technical means can be used to realize the fault. Line identification.

[0045] Step 2: use the positive and negative voltage and current data to perform a fault identification operation and a parallel processing DC circuit breaker breaking operation;

[0046] Among them, the...

Embodiment 2

[0063] Based on the above theoretical statement, the present embodiment provides a protection device, which is connected with a high-speed measurement device and a DC circuit breaker. Among them, the high-speed measurement device collects the positive and negative DC line voltage and current data before and after the protection start time and transmits it to the protection device in real time. The protection device uses the positive and negative DC line voltage and current data to perform fault identification operation and parallel processing and control of the DC circuit breaker breaking operation.

[0064] The protection device includes: a fault identification module and a DC circuit breaker breaking operation control module. Among them, the fault identification module is used to perform the fault identification operation, specifically: firstly, the fault area identification is performed, and then the fault interference identification is performed. If the fault interference ...

Embodiment 3

[0068] This embodiment provides a protection device on the basis of Embodiment 1, which includes a processor and a memory, the memory stores a computer program, and the processor invokes the computer program to execute:

[0069] Obtain line data before and after the protection start time;

[0070] Using the line data, a fault identification operation is performed and an opening operation of the DC circuit breaker is controlled. Among them, the fault identification operation and the breaking operation of the DC circuit breaker are processed in parallel.

[0071] For the specific implementation process of each step, please refer to the description of the foregoing method.

[0072] It should be understood that, in this embodiment of the present invention, the processor may be a central processing unit (Central Processing Unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), dedicated integrated Cir...

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Abstract

The invention discloses a flexible direct-current power grid fault line isolation method, protection device and system based on direct-current circuit breaker forward-shooting and pre-moving. According to the method, fault recognition operation and direct-current circuit breaker breaking operation are processed in parallel; the fault identification operation comprises the steps of firstly executing fault area identification, then performing fault interference identification, and executing fault pole selection if a fault is judged; the breaking operation of the direct-current circuit breakers comprises the steps that after a fault area identification outlet instruction is received, the corresponding direct-current circuit breakers sequentially execute the first commutation operation and the quick mechanical switch opening operation in the breaking operation; if the fault interference is judged to be interference after identification, then the direct current circuit breaker executes a first commutation reset operation; and if the fault is judged to be a fault after the fault interference identification, then the DC circuit breaker executes the second commutation operation. According to the method, the overall protection action time of the direct-current line is shortened by utilizing the parallel processing characteristic, and the fault line of the flexible direct-current power grid is quickly isolated.

Description

technical field [0001] The invention belongs to the field of power system relay protection and flexible direct current transmission, and in particular relates to a flexible direct current grid fault line isolation method, a protection device and a system thereof based on the proactive action of a direct current circuit breaker. Background technique [0002] The flexible DC grid is an effective solution to achieve smooth access, reliable delivery, optimized configuration and flexible consumption of large-scale renewable clean energy. However, compared with the AC system, the flexible DC power grid is a "low damping" system, the fault current rises rapidly, the fault spreads quickly, and the fault transient current has no natural zero-crossing point, so it is very prone to "partial faults and the whole network outage" Phenomenon. [0003] Based on the traditional serial fault isolation idea of ​​"protect the outlet first, then the circuit breaker operates", the overall protec...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/28H02J3/36
CPCH02H7/268H02H7/28H02J3/36H02J2203/20
Inventor 裴翔羽涂银钢袁艺嘉庞辉董巍陈龙龙孔明
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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