Fault isolation and fault recovery method and system for medium-voltage DC distribution network

A DC distribution network, fault isolation technology, applied in electrical components, emergency protection circuit devices, etc., can solve problems such as difficulty in realizing faults, low resistance of DC distribution lines, and inability of DC distribution lines to operate in a closed loop, and achieve recovery. power supply effect

Inactive Publication Date: 2019-03-19
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. It is difficult to guarantee selectivity
[0006] The distribution network line is short, and the resistance of the DC distribution line is small. When a fault occurs, the fault current at each place is similar. It can be blocked in a few hundred microseconds, and it is difficult to achieve the selectivity of faults through the coordination of time differences
[0007] 3. The DC power distribution line cannot run in a closed loop
[0008] Closed loo

Method used

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  • Fault isolation and fault recovery method and system for medium-voltage DC distribution network

Examples

Experimental program
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Example Embodiment

[0034] Example 1:

[0035] A method for fault isolation and fault recovery of a medium-voltage direct current distribution network, comprising the following steps:

[0036] Step 1: Configure DC circuit breakers, load switches, DC protection devices, and communication networks on medium-voltage DC distribution lines;

[0037] A DC circuit breaker is installed at the beginning of the medium-voltage DC distribution line, a load switch is installed at each section of the line, a DC protection device is installed at the beginning of the line and each section, and a communication network is configured for communication between DC protection devices.

[0038] Step 2: When a fault occurs in the medium-voltage DC distribution network, the DC protection device judges the fault point; the DC protection device at the beginning of the line trips the DC circuit breaker to remove the fault, and then the DC protection device configured at the line section trips the fault point The nearest lo...

Example Embodiment

[0044] Example 2:

[0045] figure 1 Shown is a schematic diagram of "a processing method for fault isolation and fault recovery of a medium-voltage direct current distribution network" in the present invention, and the processing method for fault isolation and fault recovery of a medium-voltage direct current distribution network is as follows:

[0046] 1. Taking the structure of single-ring network as an example to illustrate the processing method of fault isolation and fault recovery of DC distribution network.

[0047] 2. DC circuit breakers (D1, D2) and DC protection devices (G1, G7) are installed at the beginning of medium-voltage DC distribution lines, and load switches (F1, F2, F3, F4, F5) and DC Protective devices (G2, G3, G4, G5, G6).

[0048] 3. Open-loop operation during normal operation, load switch F3 is in a separated state.

[0049] 4. When a fault occurs at point f of the DC power distribution line, the overcurrent protection element of G1 operates, trips D1...

Example Embodiment

[0054] Example 3:

[0055]The present invention also proposes a fault isolation and fault recovery system for a medium-voltage DC distribution network, including a DC circuit breaker, a load switch, a DC protection device, and a communication network; a DC circuit breaker is configured at the beginning of a medium-voltage DC distribution line, A load switch is arranged at the section, and a DC protection device is arranged at the beginning of the line and at each section, and the communication network is used for communication between the DC protection devices.

[0056] When the DC protection device at the beginning of the line detects a fault current, the overcurrent protection action will trip the DC circuit breaker to remove the fault; the DC protection device configured at the line section will judge the fault point and trip the nearest load switch around the fault point to isolate the fault.

[0057] After the fault current exceeds the fixed value, the DC protection devic...

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Abstract

The invention discloses a fault isolation and fault recovery method and system for a medium-voltage DC distribution network. A start end of a medium-voltage DC distribution line is provided with a DCcircuit breaker, and each segmented part of the line is provided with a load switch. The start end of the lien and each segmented part are provided with DC protection parts. A communication network isconfigured for the communication between the DC protection parts. When the medium-voltage DC distribution network has a fault, an overcurrent protection element of the DC protection part at the startend of the line operates, and a DC circuit breaker is switched off for eliminating the fault. After a fault current exceeds a fixed value, the DC protection part at each segmented part of the line transmits the fault current and the direction of the fault current to the adjacent DC protection part, and the DC protection part determines a fault point through the fault currents of the DC protectionpart and the adjacent DC protection part and the directions of the fault current, and then the DC protection part which is the nearest to the fault point operates, the load switch is switched off toisolate the fault. After the fault is isolated, the DC circuit breaker at the start end of line is switched on and the switch for power supply is switched on, so as to recover the power supply of a non-fault region.

Description

technical field [0001] The invention belongs to the field of direct current distribution networks of power systems, and in particular relates to a method and system for fault isolation and fault restoration of medium-voltage direct current distribution networks. Background technique [0002] At present, the medium-voltage DC distribution network is in the exploratory stage, and the medium-voltage DC distribution network has the following characteristics: [0003] 1. The DC power supply is relatively fragile [0004] When a fault occurs, the inverter will be blocked quickly, and the time is as short as a few hundred microseconds at the fastest. After the inverter is blocked, the entire line will lose power. The DC protection device needs to capture the fault characteristics within a few hundred microseconds and identify the point of failure. [0005] 2. It is difficult to guarantee selectivity [0006] The distribution network line is short, and the resistance of the DC di...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 王文龙陈庆袁栋陈俊杨景刚贾勇勇肖小龙刘永生侯炜
Owner NR ELECTRIC CO LTD
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