CN112952773A - Direct-current power distribution network protection method and system and fault recovery method and system - Google Patents
Direct-current power distribution network protection method and system and fault recovery method and system Download PDFInfo
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- CN112952773A CN112952773A CN202110161032.XA CN202110161032A CN112952773A CN 112952773 A CN112952773 A CN 112952773A CN 202110161032 A CN202110161032 A CN 202110161032A CN 112952773 A CN112952773 A CN 112952773A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a protection method and a system for a direct-current power distribution network, and a fault recovery method and a system.
Description
Technical Field
The invention relates to a method and a system for protecting a direct-current power distribution network and a method and a system for recovering a fault, and belongs to the field of direct-current power distribution networks.
Background
The direct-current power distribution network has high distributed power consumption capability and high load power supply efficiency, has good development prospect, is different from the alternating-current power distribution network, the short-circuit current tolerance capability of the converter device forming the direct-current power distribution network is weak, the direct-current short-circuit current rises more rapidly, and any short-circuit fault of the direct-current power distribution network can cause the self-protection locking of the whole-network converter device in a short time. Therefore, the fault characteristic duration of the direct-current power distribution network is short, the protection is difficult to identify faults, and meanwhile, a plurality of non-fault current conversion devices need to be recovered to a normal operation state in a short time after fault isolation, so that the difficulty in constructing a secondary system of the direct-current power distribution network is further increased. Therefore, an adaptive direct-current power distribution network protection method and a fault recovery method are urgently needed.
Disclosure of Invention
The invention provides a direct current power distribution network protection method and system and a fault recovery method and system, which solve the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a protection method for a direct current distribution network comprises the following steps,
receiving the overcurrent direction judged by the switch protection and detection device adjacent to the network from the network;
judging the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device;
responding to the fault occurrence position and the switch where the fault occurrence position and the fault occurrence position are on the same line or the bus, and tripping off the switch where the fault occurrence position and the switch where the fault occurrence position are located;
and responding to the received position division signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the network.
The network is a GOOSE network.
A protection system for a DC distribution network comprises,
a receiving module: receiving the overcurrent direction judged by the switch protection and detection device adjacent to the network from the network;
fault occurrence position judging module: judging the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device;
tripping the switch module: responding to the fault occurrence position and the switch where the fault occurrence position and the fault occurrence position are on the same line or the bus, and tripping off the switch where the fault occurrence position and the switch where the fault occurrence position are located;
a signal sending module: and responding to the received position division signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the network.
A fault recovery method for a direct current distribution network comprises the following steps,
responding to a received protection success isolation fault signal in the network, and acquiring the on-off state of each switch and the unlocking state of the current conversion device from the network;
constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device;
determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix;
and sending fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
And sequentially issuing fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
And if a plurality of power supply type current conversion devices and a plurality of load type current conversion devices are arranged, issuing a fault recovery instruction according to the preset priority.
The network is a GOOSE network.
A fault recovery system for a DC power distribution network comprises,
a state acquisition module: responding to a received protection success isolation fault signal in the network, and acquiring the on-off state of each switch and the unlocking state of the current conversion device from the network;
a topology matrix construction module: constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device;
a closing and opening ring state and load transfer and supply demand determining module: determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix;
an instruction issuing module: and sending fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a direct current power distribution network protection method or a direct current power distribution network fault recovery method.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing a direct current power distribution network protection method or a direct current power distribution network fault recovery method.
The invention achieves the following beneficial effects: the fault location is determined based on the overcurrent direction, the fault is effectively isolated, after the fault is isolated, the fault recovery instruction is issued based on the network topology matrix, each current conversion device is unlocked again to recover power supply, the whole process does not exceed one hundred milliseconds, and the safe and reliable operation of the direct-current power distribution network is effectively guaranteed.
Drawings
Fig. 1 is a flow chart of a method of protecting a dc distribution network;
fig. 2 is a flowchart of a dc power distribution network fault recovery method.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The protection and fault recovery system of the direct-current power distribution network comprises a protection, measurement and control integrated device (a switch protection and measurement device for short) of each switch, a GOOSE network and a fault recovery device; the switch protection and test device and the fault recovery device are connected to a GOOSE network, and the control protection device of each current conversion device is also connected to the GOOSE network.
As shown in fig. 1, a method for protecting a dc distribution network is applicable to a side of a switch protection and measurement device, and specifically includes the following steps:
step 1, receiving the overcurrent direction judged by the switch protection and detection device adjacent to the GOOSE network from the GOOSE network.
The protection and test device side has the capacity of judging overcurrent and collecting switch on-off states, and the protection and test device sends the judgment result to the GOOSE network.
The overcurrent direction is the current direction judged after the current amplitude exceeds a fixed value, and is positive if the current is regular, and is reverse if the current is negative.
And 2, comprehensively judging the fault occurrence position according to the overcurrent direction judged by the self and the overcurrent direction judged by the switch protection and detection device adjacent to the self.
Step 3, if the fault position and the switch where the fault occurs are on the same line or bus, the protection action jumps off the switch where the fault occurs; otherwise the protection does not act.
And 4, responding to the received branch position signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the GOOSE network.
The software system and the direct-current distribution network protection system corresponding to the method are loaded on the side of the switch protection and test device, and the method comprises the following steps:
a receiving module: receiving the overcurrent direction judged by the switch protection and detection device adjacent to the GOOSE network from the GOOSE network;
fault occurrence position judging module: judging the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device;
tripping the switch module: responding to the fault occurrence position and the switch where the fault occurrence position and the fault occurrence position are on the same line or the bus, and tripping off the switch where the fault occurrence position and the switch where the fault occurrence position are located;
a signal sending module: and responding to the received branch signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the GOOSE network.
After the fault isolation is successful, a fault recovery process needs to be started, as shown in fig. 2, a method for recovering a fault of a direct-current power distribution network is suitable for a fault recovery device side, and includes the following steps:
step 1, responding to a signal of successfully protecting and isolating a fault in a GOOSE network, and acquiring the on-off state of each switch and the unlocking state of a current conversion device from the network; and the on-off state and the unlocking state are respectively transmitted to the GOOSE network by the switch protection device and the current conversion device control protection device.
And 2, constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device.
And step 3, determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix.
The direct current distribution network topology matrix reflects the wiring condition of the whole power grid, namely the power supply access condition of the power grid, whether loop closing is performed between converters of the direct current distribution network or not and whether the original power source of a load is lost or not can be obtained through the topology matrix, so that the loop closing and opening state of the direct current distribution network is obtained, and whether load transfer is needed or not is confirmed.
And 4, sequentially issuing fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state of the direct-current power distribution network and the load transfer requirement.
If a plurality of power source type converter devices and a plurality of load type converter devices are not unique, the fault recovery instructions are sequentially issued at fixed intervals according to preset priority.
And after receiving the fault recovery instruction, the power supply type converter devices recover to a normal unlocking state, the power supply type converter device with the highest priority in the same GOOSE network is responsible for fixing the voltage of the power grid, namely, the power supply type converter device is unlocked in a fixed voltage mode, the other power supply type converter devices are connected to the power grid after receiving the fault recovery instruction, namely, the power supply type converter devices are unlocked in a fixed zero power mode, and after receiving the fault recovery instruction, the load type converter devices recover to a normal unlocking state, so that the power supply of the direct current power distribution network is recovered. If the load at a certain position loses the original power supply and can be transferred to other power supply paths by closing a certain switch, the switch command is issued.
The software system corresponding to the method, the direct current distribution network fault recovery system are loaded on the fault recovery device side, and the method comprises the following steps:
a state acquisition module: responding to a received protection success isolation fault signal in the network, and acquiring the on-off state of each switch and the unlocking state of the current conversion device from the network;
a topology matrix construction module: constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device;
a closing and opening ring state and load transfer and supply demand determining module: determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix;
an instruction issuing module: and sending fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
The protection and fault recovery of the direct-current power distribution network are integrated, namely the protection is carried out first and then the fault recovery is started immediately, the whole process does not exceed one hundred milliseconds, and the specific steps are as follows:
1) and the switch protection and test device receives the overcurrent direction judged by the switch protection and test device adjacent to the switch protection and test device from the GOOSE network.
2) The switch protection and detection device comprehensively judges the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device and the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device.
3) If the fault position and the switch where the fault occurs are on the same line or bus, the protection action jumps off the switch where the fault occurs; otherwise the protection does not act.
4) And responding to the received branch signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the GOOSE network.
5) And responding to the GOOSE network to receive a protection success isolation fault signal, and the fault recovery device acquires the on-off state of each switch and the unlocking state of the current conversion device from the network.
6) And the fault recovery device constructs a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device.
7) And the fault recovery device determines the on-off loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix.
8) And the fault recovery device sequentially issues fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state of the direct-current power distribution network and the load transfer requirement.
The fault location is determined based on the overcurrent direction, the fault is effectively isolated, after the fault is isolated, the fault recovery instruction is issued based on the network topology matrix, each current conversion device is unlocked again to recover power supply, the whole process does not exceed one hundred milliseconds, and the safe and reliable operation of the direct-current power distribution network is effectively guaranteed.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a direct current power distribution network protection method or a direct current power distribution network fault recovery method.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing a direct current power distribution network protection method or a direct current power distribution network fault recovery method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. A protection method for a direct current distribution network is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
receiving the overcurrent direction judged by the switch protection and detection device adjacent to the network from the network;
judging the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device;
responding to the fault occurrence position and the switch where the fault occurrence position and the fault occurrence position are on the same line or the bus, and tripping off the switch where the fault occurrence position and the switch where the fault occurrence position are located;
and responding to the received position division signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the network.
2. The method according to claim 1, wherein the method comprises the following steps: the network is a GOOSE network.
3. A direct current distribution network protection system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a receiving module: receiving the overcurrent direction judged by the switch protection and detection device adjacent to the network from the network;
fault occurrence position judging module: judging the fault occurrence position according to the overcurrent direction judged by the switch protection and detection device adjacent to the switch protection and detection device;
tripping the switch module: responding to the fault occurrence position and the switch where the fault occurrence position and the fault occurrence position are on the same line or the bus, and tripping off the switch where the fault occurrence position and the switch where the fault occurrence position are located;
a signal sending module: and responding to the received position division signal of the switch where the switch is located, and sending a signal for successfully protecting and isolating the fault to the network.
4. A fault recovery method for a direct current distribution network is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
responding to a received protection success isolation fault signal in the network, and acquiring the on-off state of each switch and the unlocking state of the current conversion device from the network;
constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device;
determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix;
and sending fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
5. The method for recovering the fault of the direct-current power distribution network according to claim 4, wherein the method comprises the following steps: and sequentially issuing fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
6. The method for recovering the fault of the direct-current power distribution network according to claim 5, wherein the method comprises the following steps: and if a plurality of power supply type current conversion devices and a plurality of load type current conversion devices are arranged, issuing a fault recovery instruction according to the preset priority.
7. The method for recovering the fault of the direct-current power distribution network according to claim 4, wherein the method comprises the following steps: the network is a GOOSE network.
8. The utility model provides a direct current distribution network fault recovery system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a state acquisition module: responding to a received protection success isolation fault signal in the network, and acquiring the on-off state of each switch and the unlocking state of the current conversion device from the network;
a topology matrix construction module: constructing a direct-current power distribution network topology matrix according to the on-off state of each switch and the unlocking state of the current conversion device;
a closing and opening ring state and load transfer and supply demand determining module: determining the closed-loop state and the load transfer requirement of the direct-current power distribution network according to the direct-current power distribution network topology matrix;
an instruction issuing module: and sending fault recovery instructions to the power supply type converter device, the load transfer switch and the load type converter device according to the on-off loop state and the load transfer requirement of the direct-current power distribution network.
9. A computer readable storage medium storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-2, or 4-7.
10. A computing device, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-2, or 4-7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110161032.XA CN112952773A (en) | 2021-02-05 | 2021-02-05 | Direct-current power distribution network protection method and system and fault recovery method and system |
| PCT/CN2021/077003 WO2022165859A1 (en) | 2021-02-05 | 2021-02-20 | Direct current distribution network protection method and system, and failure recovery method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110161032.XA CN112952773A (en) | 2021-02-05 | 2021-02-05 | Direct-current power distribution network protection method and system and fault recovery method and system |
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| CN112952773A true CN112952773A (en) | 2021-06-11 |
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| CN202110161032.XA Withdrawn CN112952773A (en) | 2021-02-05 | 2021-02-05 | Direct-current power distribution network protection method and system and fault recovery method and system |
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| CN (1) | CN112952773A (en) |
| WO (1) | WO2022165859A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820562A (en) * | 2021-09-08 | 2021-12-21 | 国电南瑞科技股份有限公司 | Low-voltage direct-current power distribution network fault processing system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115508670B (en) * | 2022-11-04 | 2023-04-18 | 清华大学 | Flexible direct current traction power supply system contact net fault current calculation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026045A (en) * | 2016-06-28 | 2016-10-12 | 国网山东省电力公司济南供电公司 | Fault handling method for cable line comprising distributed power supply |
| CN107872058B (en) * | 2017-11-22 | 2021-07-02 | 深圳供电局有限公司 | Distribution network integrated protection method fusing self-healing of line |
| CN108988305B (en) * | 2018-07-24 | 2020-07-28 | 南京南瑞继保电气有限公司 | Protection method of direct current power distribution network system |
| EP3696927A1 (en) * | 2019-02-15 | 2020-08-19 | Siemens Aktiengesellschaft | Device and method for monitoring a plurality of feeders in a power grid |
| CN110224383B (en) * | 2019-06-28 | 2021-09-07 | 深圳供电局有限公司 | Power distribution network fault self-healing and line loss cooperative optimization method and system |
| CN111969568B (en) * | 2020-06-29 | 2022-06-17 | 国电南瑞南京控制***有限公司 | Method, system and storage medium for fault location, isolation and self-healing of direct-current power distribution network |
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2021
- 2021-02-05 CN CN202110161032.XA patent/CN112952773A/en not_active Withdrawn
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113820562A (en) * | 2021-09-08 | 2021-12-21 | 国电南瑞科技股份有限公司 | Low-voltage direct-current power distribution network fault processing system and method |
| CN113820562B (en) * | 2021-09-08 | 2024-05-14 | 国电南瑞科技股份有限公司 | Low-voltage direct-current power distribution network fault processing system and method |
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| WO2022165859A1 (en) | 2022-08-11 |
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Application publication date: 20210611 |
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