CN109494695A - A kind of method and system of middle straightening stream distribution network failure isolation and fault recovery - Google Patents

A kind of method and system of middle straightening stream distribution network failure isolation and fault recovery Download PDF

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Publication number
CN109494695A
CN109494695A CN201910012158.3A CN201910012158A CN109494695A CN 109494695 A CN109494695 A CN 109494695A CN 201910012158 A CN201910012158 A CN 201910012158A CN 109494695 A CN109494695 A CN 109494695A
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CN
China
Prior art keywords
fault
direct current
protecting device
current protecting
isolation
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Pending
Application number
CN201910012158.3A
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Chinese (zh)
Inventor
王文龙
陈庆
袁栋
陈俊
杨景刚
贾勇勇
肖小龙
刘永生
侯炜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Jiangsu Electric Power Co Ltd
NR Electric Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
State Grid Jiangsu Electric Power Co Ltd
NR Electric Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by State Grid Jiangsu Electric Power Co Ltd, NR Electric Co Ltd, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical State Grid Jiangsu Electric Power Co Ltd
Priority to CN201910012158.3A priority Critical patent/CN109494695A/en
Publication of CN109494695A publication Critical patent/CN109494695A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems

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  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention discloses the method and system of a kind of middle straightening stream distribution network failure isolation and fault recovery; on middle pressure DC power distribution line; route beginning configuring direct current breaker; configuration load switchs at line sectionalizing; configuring direct current is protected at route beginning, each segmentation, and configuration communication network is for the communication between direct current protecting.When straightening stream power distribution network breaks down in the middle; the overflow protecting element of route beginning direct current protecting acts; tripping dc circuit breaker; failure is cut off, fault current and fault current direction are passed to adjacent direct current protecting after fault current is more than definite value by the direct current protecting configured at line sectionalizing; direct current protecting determines fault point by the fault current and fault current direction of itself and adjacent direct current protecting; then direct current protecting nearest around fault point movement, tripping on-load switch, isolated fault.After Fault Isolation, closes route beginning dc circuit breaker and turn the switch of power supply, restore non-faulting block supply.

Description

A kind of method and system of middle straightening stream distribution network failure isolation and fault recovery
Technical field
The invention belongs to electric system DC distribution net field, in particular to a kind of middle straightening stream distribution network failure isolation with The method and system of fault recovery.
Background technique
Straightening stream power distribution network is in the exploratory stage at present, and middle straightening stream power distribution network has the following characteristics that
1. DC power supply is more fragile
When a failure occurs it, inverter can be latched quickly, as long as time most fast several hundred a microseconds, converter blocking are later whole Route can power loss, direct current protecting device needs capture fault signature in several hundred a microseconds and determine fault point.
2. being difficult to ensure selectivity
Distribution network line is shorter, and the resistance of DC power distribution line is smaller, and when breaking down, fault current everywhere is close, The selectivity of failure is difficult to realize by the Graded coordination of different location fault current;And since as long as inverter is most fast several hundred A microsecond can be latched, and the selectivity of failure is also difficult to realize by the Graded coordination of time.
3. DC power distribution line is unable to Electromagnetic coupling
Electromagnetic coupling, two inverters can be all latched when breaking down, and will lead to the expansion of fault coverage.
The characteristics of due to middle straightening stream power distribution network, with overcurrent is differential and the time differential is difficult to realize middle straightening stream power distribution network Fault Isolation and fault recovery, the present invention provides a set of new methods for solving the problems, such as this.
Summary of the invention
To solve the above-mentioned problems, the method that the present invention proposes a kind of middle straightening stream distribution network failure isolation and fault recovery And system, applied to the protection and control system of middle straightening stream power distribution network, isolation when straightening stream power distribution network breaks down in realization Fault zone, the power supply for restoring non-faulting region.
To achieve the goals above, the technical scheme adopted by the invention is that:
A kind of method of middle straightening stream distribution network failure isolation and fault recovery, the described method comprises the following steps:
Step 1: configuring direct current breaker, on-load switch, direct current protecting device, communication network on middle straightening stream distribution line Network;Middle straightening stream distribution wire beginning configuring direct current breaker, configuration load switch, route beginning, Mei Gefen at the segmentation of route Configuring direct current protective device at section, the communication network is for the communication between direct current protecting device;
Step 2: when middle straightening stream power distribution network breaks down, fault point being judged by direct current protecting device;Route beginning it is straight Protective device tripping dc circuit breaker is flowed, failure is cut off, the direct current protecting device tripping fault point then configured at line sectionalizing The nearest on-load switch isolated fault of surrounding;
Step 3: after Fault Isolation, closing dc circuit breaker and turn the switch of power supply, restore the power supply in non-faulting area.
Preferably, in the step 2, the following contents is specifically included:
Step 21: direct current protecting device mistake when middle straightening stream power distribution network breaks down, at route beginning dc circuit breaker Protection act is flowed, tripping dc circuit breaker cuts off failure;
Step 22: the direct current protecting device configured at line sectionalizing passes through communication network after fault current is more than definite value Fault current and fault current direction are passed to adjacent direct current protecting device by network, do not detect the direct current protecting of failure Device will not transmit fault current and fault current direction;
Step 23: direct current protecting device passes through fault current and the determination of fault current direction of itself and adjacent protection Fault point, then direct current protecting device action nearest around fault point, tripping on-load switch, isolated fault.
Preferably, the communication protocol between the direct current protecting device uses GOOSE.
Preferably, after direct current protecting device action nearest around fault point in the step 2, while action signal being sent To DC power distribution line beginning and turn the direct current protecting device configured at power switch;
DC power distribution line beginning and the direct current protecting device for turning to configure at power switch are receiving in the step 3 The closing operation after Fault Isolation is carried out after carrying out the action signal of the direct current protecting device of Fault Isolation, restores non-faulting area Power supply.
The present invention proposes a kind of middle straightening stream distribution network failure isolation and fault recovery system, including direct current interruption simultaneously Device, on-load switch, direct current protecting device and communication network;Middle straightening stream distribution wire beginning configuring direct current breaker, point of route Configuration load switchs at section, and configuring direct current protective device at route beginning, each segmentation, the communication network is used for direct current protecting Communication between device.
Overcurrent protection acts when the direct current protecting device at route beginning detects fault current, and tripping dc circuit breaker is cut Except failure;
The direct current protecting device configured at line sectionalizing judges fault point, around tripping fault point nearest on-load switch every From failure;
DC power distribution line beginning and the direct current protecting device for turning configuration at power switch carry out the conjunction after Fault Isolation Lock operation, restores the power supply in non-faulting area.
Preferably, the direct current protecting device configured at line sectionalizing passes through communication network after fault current is more than definite value Fault current and fault current direction are passed to adjacent direct current protecting device by network, do not detect the direct current protecting of failure Device will not transmit fault current and fault current direction;
Direct current protecting device passes through the determining event of fault current and fault current direction of itself and adjacent protective device Hinder point, nearest direct current protecting device action, tripping on-load switch, isolated fault around fault point, while action signal being given The direct current protecting device of DC power distribution line beginning configuration.
Preferably, DC power distribution line beginning and turn at power switch configure direct current protecting device receiving carry out The closing operation after Fault Isolation is carried out after the action signal of Fault Isolation direct current protecting device, restores the power supply in non-faulting area.
Preferably, the communication protocol between the direct current protecting device uses GOOSE.
The beneficial effects of the present invention are: when straightening stream power distribution network breaks down in the middle, a kind of Fault Isolation and failure are provided The power supply in non-faulting region is restored in the method and system of recovery, isolated fault region.
Detailed description of the invention
Fig. 1 is the signal of " a kind of method and system of middle straightening stream distribution network failure isolation and fault recovery " in the present invention Figure.
Specific embodiment
Technical solution of the present invention is described in detail below with reference to attached drawing.
Embodiment 1:
A kind of method of middle straightening stream distribution network failure isolation and fault recovery, comprising the following steps:
Step 1: configuring direct current breaker, on-load switch, direct current protecting device, communication network on middle straightening stream distribution line Network;
Configuration load switchs at middle straightening stream distribution wire beginning configuring direct current breaker, the segmentation of route, route beginning, Configuring direct current protective device at each segmentation, configuration communication network is for the communication between direct current protecting device.
Step 2: when middle straightening stream power distribution network breaks down, fault point being judged by direct current protecting device;Route beginning it is straight Protective device tripping dc circuit breaker is flowed, failure is cut off, the direct current protecting device tripping fault point then configured at line sectionalizing The nearest on-load switch isolated fault of surrounding;
Step 21: direct current overcurrent protection dress when middle straightening stream power distribution network breaks down, at route beginning dc circuit breaker Movement is set, tripping dc circuit breaker cuts off failure;
Step 22: the direct current protecting device configured at line sectionalizing passes through communication network after fault current is more than definite value Fault current and fault current direction are passed to adjacent direct current protecting device by network, do not detect the direct current protecting of failure Device will not transmit fault current and fault current direction;Communication protocol in the present embodiment between direct current protecting device uses GOOSE。
Step 23: direct current protecting device passes through fault current and the fault current direction of itself and adjacent protective device Determine fault point, then direct current protecting device action nearest around fault point, tripping on-load switch, isolated fault simultaneously will Action signal gives DC power distribution line beginning and turns the direct current protecting device configured at power switch;
Step 3: after Fault Isolation, closing DC power distribution line beginning and turn power switch, restore non-faulting area Power supply.
DC power distribution line beginning and turn at power switch configure direct current protecting device receive carry out failure every From direct current protecting device action signal after carry out Fault Isolation after closing operation, restore non-faulting area power supply.
Embodiment 2:
Fig. 1 show in the present invention showing for " a kind of processing method of middle straightening stream distribution network failure isolation and fault recovery " It is intended to, the Fault Isolation of middle straightening stream power distribution network and the processing method of fault recovery are as follows:
1, illustrate the processing method of DC distribution net Fault Isolation and fault recovery by taking the framework of Single-ring network as an example.
2, middle pressure DC power distribution line beginning configuring direct current breaker (D1, D2) and direct current protecting device (G1, G7), non-beginning Configuration load switch (F1, F2, F3, F4, F5) and direct current protecting device (G2, G3, G4, G5, G6) at the segmentation at end.
3, open loop operation when operating normally, on-load switch F3 are in separated state.
4, when DC power distribution line f point breaks down, the overflow protecting element of G1 is acted, and tripping D1 cuts off failure.
5, after failure occurs, G1 and G2 can detect failure, and the direction of fault current and fault current is passed through GOOSE is transmitted to adjacent direct current protecting device;G3 and G4 cannot detect fault current, not to adjacent direct current protecting device Transmit fault current and fault current direction.
6, all faulty electric current and fault current direction is identical at G1 and G2 two, fault point is not between G1 and G2;G2 Faulty electric current and fault current direction flow to f, and G3, which does not have fault current, yet does not have fault current direction, so fault point exists Between G2 and G3;No fault current at G3 and G4, fault point is not between G3 and G4.
7, G2, G3 are acted, tripping F1 and F2, isolated fault.
8, after Fault Isolation, D1 and F3 close, and restore non-faulting block supply.
Embodiment 3:
The present invention proposes a kind of middle straightening stream distribution network failure isolation and fault recovery system, including direct current interruption simultaneously Device, on-load switch, direct current protecting device and communication network;Middle straightening stream distribution wire beginning configuring direct current breaker, point of route Configuration load switchs at section, and configuring direct current protective device at route beginning, each segmentation, the communication network is used for direct current protecting Communication between device.
Overcurrent protection acts when the direct current protecting device at route beginning detects fault current, and tripping dc circuit breaker is cut Except failure;The direct current protecting device configured at line sectionalizing judges fault point, around tripping fault point nearest on-load switch every From failure.
The direct current protecting device configured at line sectionalizing is after fault current is more than definite value, by communication network by failure Electric current and fault current direction pass to adjacent direct current protecting device, do not detect that the direct current protecting device of failure will not Transmit fault current and fault current direction;Communication protocol in the present embodiment between direct current protecting device uses GOOSE.
Direct current protecting device is true by the fault current of itself and adjacent direct current protective device and fault current direction Determine fault point, nearest direct current protecting device action around fault point, tripping on-load switch, isolated fault, while will movement letter It number gives DC power distribution line beginning and turns the direct current protecting device configured at power switch.
DC power distribution line beginning and the direct current protecting device for turning to configure at power switch receive carry out Fault Isolation Direct current protecting device action signal after carry out Fault Isolation after closing operation, restore non-faulting area power supply.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention Within.

Claims (8)

1. a kind of method of middle straightening stream distribution network failure isolation and fault recovery, it is characterised in that: the method includes following Step:
Step 1: configuring direct current breaker, on-load switch, direct current protecting device, communication network on middle straightening stream distribution line; Middle straightening stream distribution wire beginning configuring direct current breaker, configuration load switch at the segmentation of route, at route beginning, each segmentation Configuring direct current protective device, the communication network is for the communication between direct current protecting device;
Step 2: when middle straightening stream power distribution network breaks down, fault point being judged by direct current protecting device;The direct current at route beginning is protected Protection unit tripping dc circuit breaker cuts off failure, around the direct current protecting device tripping fault point then configured at line sectionalizing Nearest on-load switch isolated fault;
Step 3: after Fault Isolation, closing dc circuit breaker and turn the switch of power supply, restore the power supply in non-faulting area.
2. the method for a kind of middle straightening stream distribution network failure isolation and fault recovery as described in claim 1, which is characterized in that In the step 2, the following contents is specifically included:
Step 21: when middle straightening stream power distribution network breaks down, the direct current protecting device overcurrent protection movement of route beginning configuration is jumped Dc circuit breaker is opened, failure is cut off;
Step 22: the direct current protecting device configured at line sectionalizing, will by communication network after fault current is more than definite value Fault current and fault current direction pass to adjacent direct current protecting device, do not detect the direct current protecting device of failure Fault current and fault current direction will not be transmitted;
Step 23: direct current protecting device passes through fault current and the determination of fault current direction of itself and adjacent protective device Fault point, then direct current protecting device action nearest around fault point, tripping switch, isolated fault.
3. the method for a kind of middle straightening stream distribution network failure isolation and fault recovery as described in claim 1, which is characterized in that Communication protocol between direct current protecting device uses GOOSE.
4. the method for a kind of middle straightening stream distribution network failure isolation and fault recovery as described in claim 1, which is characterized in that In the step 2 after direct current protection device shield nearest around fault point movement, while giving action signal to DC power distribution line Beginning and the direct current protecting device for turning configuration at power switch;
Route beginning and the direct current protecting device for turning to configure at power switch are receiving progress Fault Isolation in the step 3 The closing operation after Fault Isolation is carried out after the action signal of direct current protecting device, restores the power supply in non-faulting area.
5. a kind of middle straightening stream distribution network failure isolation and fault recovery system, which is characterized in that including dc circuit breaker, load Switch, direct current protecting device and communication network;Middle straightening stream distribution wire beginning configuring direct current breaker configures at the segmentation of route On-load switch, configuring direct current protective device at route beginning, each segmentation, the communication network is between direct current protecting device Communication;
Overcurrent protection acts when the direct current protecting device at route beginning detects fault current, tripping dc circuit breaker, excision event Barrier;
The direct current protecting device configured at line sectionalizing judge fault point, and the isolation of nearest on-load switch is former around tripping fault point Barrier;
Distribution line beginning and the direct current protecting device for turning configuration at power switch carry out the closing operation after Fault Isolation, extensive The power supply in multiple non-faulting area.
6. a kind of middle straightening stream distribution network failure isolation as claimed in claim 5 and fault recovery system, which is characterized in that
The direct current protecting device configured at line sectionalizing is after fault current is more than definite value, by communication network by fault current And fault current direction passes to adjacent direct current protecting device, does not detect that the direct current protecting device of failure will not transmit Fault current and fault current direction;
Direct current protecting device determines fault point, failure by the fault current and fault current direction of itself and adjacent protection Nearest direct current protecting device action, tripping on-load switch, isolated fault around point, while giving action signal to DC distribution Route beginning and the direct current protecting device for turning configuration at power switch.
7. a kind of middle straightening stream distribution network failure isolation as claimed in claim 6 and fault recovery system, which is characterized in that match Electric line beginning and the direct current protecting device for turning configuration at power switch are receiving the direct current protecting dress for carrying out Fault Isolation The closing operation after Fault Isolation is carried out after the action signal set, and restores the power supply in non-faulting area.
8. a kind of middle straightening stream distribution network failure isolation as claimed in claim 5 and fault recovery system, which is characterized in that straight The communication protocol flowed between protective device uses GOOSE.
CN201910012158.3A 2019-01-07 2019-01-07 A kind of method and system of middle straightening stream distribution network failure isolation and fault recovery Pending CN109494695A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110311359A (en) * 2019-06-05 2019-10-08 许继集团有限公司 A kind of DC distribution net networking protection system
CN110544927A (en) * 2019-09-25 2019-12-06 南京南瑞继保电气有限公司 direct-current transmission line protection setting method with current direction criterion
CN111211542A (en) * 2019-12-31 2020-05-29 中宝电气有限公司 Fusion type power transmission line fault isolation method
CN111682510A (en) * 2020-05-18 2020-09-18 天津大学 First-removal and then-isolation protection method for ground fault of symmetrical unipolar direct-current microgrid
CN111884196A (en) * 2020-08-04 2020-11-03 国网江苏省电力有限公司扬州供电分公司 Method and device for power supply recovery after flexible direct-current distribution line fault
CN112234585A (en) * 2019-07-15 2021-01-15 南京南瑞继保电气有限公司 Medium-voltage direct-current power distribution network protection control system and method
CN114207975A (en) * 2019-03-29 2022-03-18 西门子股份公司 Method for coordinating protection devices in a power distribution network
CN114207975B (en) * 2019-03-29 2024-05-31 西门子股份公司 Method for coordinating protection devices in a power distribution network

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CN106684821A (en) * 2016-12-13 2017-05-17 华电电力科学研究院 Intelligent power distribution protection device with self-healing function and application thereof

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Publication number Priority date Publication date Assignee Title
CN106684821A (en) * 2016-12-13 2017-05-17 华电电力科学研究院 Intelligent power distribution protection device with self-healing function and application thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114207975A (en) * 2019-03-29 2022-03-18 西门子股份公司 Method for coordinating protection devices in a power distribution network
CN114207975B (en) * 2019-03-29 2024-05-31 西门子股份公司 Method for coordinating protection devices in a power distribution network
CN110311359A (en) * 2019-06-05 2019-10-08 许继集团有限公司 A kind of DC distribution net networking protection system
CN110311359B (en) * 2019-06-05 2021-10-22 许继集团有限公司 Networked protection system for direct-current power distribution network
CN112234585A (en) * 2019-07-15 2021-01-15 南京南瑞继保电气有限公司 Medium-voltage direct-current power distribution network protection control system and method
CN110544927A (en) * 2019-09-25 2019-12-06 南京南瑞继保电气有限公司 direct-current transmission line protection setting method with current direction criterion
CN111211542A (en) * 2019-12-31 2020-05-29 中宝电气有限公司 Fusion type power transmission line fault isolation method
CN111682510A (en) * 2020-05-18 2020-09-18 天津大学 First-removal and then-isolation protection method for ground fault of symmetrical unipolar direct-current microgrid
CN111884196A (en) * 2020-08-04 2020-11-03 国网江苏省电力有限公司扬州供电分公司 Method and device for power supply recovery after flexible direct-current distribution line fault

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