CN114069579A - Method for power supply recovery after flexible direct-current distribution line fault based on injection signal - Google Patents
Method for power supply recovery after flexible direct-current distribution line fault based on injection signal Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- 238000002347 injection Methods 0.000 title claims abstract description 13
- 239000007924 injection Substances 0.000 title claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 16
- 238000013024 troubleshooting Methods 0.000 claims abstract description 3
- 238000004146 energy storage Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 7
- 238000011161 development Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a method for power restoration of a flexible direct-current distribution line after a fault based on an injection signal. Relates to the technical field of power system relay protection. The method comprises a fault detection step, a power failure positioning step, a blocking step, a standby power supply step and an overhauling and troubleshooting step. The line is changed from the fault working mode to the normal working mode, and the line fault isolation and the fault recovery are closely related to the on-off state of the interconnection switch. The quick fault isolation and recovery of the direct-current distribution line can be realized through the matching of the blocking type current converter, the direct-current load switch and the interconnection switch.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a method for power supply recovery after a fault of a flexible direct-current distribution line based on an injection signal.
Background
At present, the direct current technology is widely applied to a power system due to the advantages of large transmission capacity, low line cost, no need of synchronous operation and the like. With the continuous operation of direct current engineering, China has built up the largest alternating current-direct current series-parallel power grid in the world at present. The direct-current power distribution network is an important component of an alternating-current and direct-current hybrid power grid, has important significance for receiving distributed energy and improving the quality of electric energy, and is one of mainstream forms of future power distribution network development. After the direct current distribution line has a short-circuit fault, the fault development speed is very fast, the tolerance of a power electronic device is limited, and the fault line needs to be quickly and selectively cut off from the direct current distribution network so as to realize fault isolation and recovery of the direct current distribution line.
However, the research and construction of flexible dc power distribution networks are still in the exploration phase at home and abroad. Different from a flexible direct current transmission network, a direct current circuit breaker is not generally arranged in the flexible direct current distribution network at the present stage due to the restriction of factors such as investment cost and the like, and the fault current limiting of the flexible direct current distribution network depends on a blocking type current converter. The different direct current line switching devices cause different fault isolation and recovery methods, and the fault recovery scheme of the flexible direct current transmission line cannot be directly applied to the direct current distribution line, so that further research on the fault recovery method applicable to the flexible direct current distribution line is still needed.
The fault recovery technology has a great influence on the power supply reliability of the direct current distribution network, and has important significance on the safe operation of direct current distribution network equipment and the stable operation of a system. Therefore, how to research a fault recovery method suitable for the flexible direct current distribution line by combining the characteristics of the direct current distribution network becomes an urgent problem to be solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for power supply recovery after a fault of a flexible direct current distribution line based on an injection signal.
The invention is realized by adopting the following technical scheme: a method for power supply recovery after a flexible direct current distribution line fault based on an injection signal comprises the following steps:
a fault detection step, wherein after the direct current distribution line has a fault, the relay protection carries out fault detection to correctly detect the fault in the line area;
a power failure positioning step, namely after the fault detection is finished, locking the current converter, powering down the whole line, positioning the fault by using a positioning device, identifying a fault section according to a positioning result and obtaining a fault position;
blocking, namely after detecting a direct current line fault by a measuring point, protecting to send a blocking instruction to a load switch, receiving the instruction by the load switch, and disconnecting direct current load switches on two sides of a fault section;
a standby power supply step, namely after the fault of the direct current line is isolated, switching on a contact switch, putting a load behind a fault point into a standby power supply, and supplying power by an adjacent converter circuit; meanwhile, the converter is quickly restarted by using the energy storage equipment, and the load power supply to the fault point is recovered;
a step of maintenance and troubleshooting, in which power maintenance personnel are dispatched to the site to remove the fault at a fixed point according to the fault positioning result; and after the fault is cleared, performing manual switching operation to restore the normal operation mode of the direct-current distribution line.
The fault detection method used in the fault detection step is a current protection method, a pilot protection method or a boundary protection method.
And fault location in the power failure location step adopts an impedance method, a single-ended traveling wave method or a double-ended traveling wave method.
The fault detection step comprises a current limiting isolation step, wherein a blocking type converter is used for current limiting, the blocking type converter can feed fault current into a fault point through a submodule blocking alternating current system so as to reduce short-circuit current, and then fault section selection is carried out.
And in the current limiting and isolating step, after the direct current distribution line has a fault, the protection detects the fault and isolates the fault, and meanwhile, the line is switched from a normal working mode to a fault working mode.
The direct current distribution line is one or more of three-section three-connection, three-section four-connection or four-section three-connection.
The DC distribution line is controlled to be quickly blocked and restored by matching the blocking type current converter with the DC load switch and the interconnection switch.
Compared with the prior art, the invention can improve the power supply reliability and simultaneously keep independent operation of each direct current line as much as possible. Therefore, the direct-current power distribution network topology without the direct-current circuit breaker adopts a multi-section multi-connection structure. When the direct current distribution network operates normally, each line operates independently and does not interfere with each other. After the direct current distribution line breaks down, the protection detects the fault and isolates the fault, meanwhile, the line is switched from a normal working mode to a fault working mode, after the fault is cleared, the line is switched from the fault working mode to the normal working mode, and the line fault isolation and the fault recovery are closely related to the opening and closing state of the interconnection switch. The quick fault isolation and recovery of the direct-current distribution line can be realized through the matching of the blocking type current converter, the direct-current load switch and the interconnection switch.
Drawings
Fig. 1 shows a flow chart of an algorithm for fault isolation and restoration of a direct current distribution line according to the scheme of the invention;
fig. 2 shows a schematic diagram of the application of the inventive solution to a multi-segment multi-contact dc distribution network;
figure 3 shows a schematic diagram of dc distribution line fault isolation;
fig. 4 shows a schematic diagram of the fault recovery of the dc distribution line.
Detailed Description
The present invention will be further described with reference to fig. 1 to 4 and the detailed description thereof, and it should be noted that any combination of the embodiments or technical features described below can form a new embodiment without conflict.
As shown in fig. 1, a method for power restoration after a fault of a flexible dc distribution line based on an injected signal is proposed, after a short-circuit fault occurs in the dc distribution line; the relay protection carries out fault detection, and faults in the line area are correctly detected; after the fault detection is finished, the protection sends a blocking instruction to the current converter, the current converter receives the instruction, the AC system is blocked to feed fault current into a fault point, the fault development is inhibited, after the current converter is locked, a signal is injected into a line outlet, fault section selection is carried out according to the response detected by a measuring point, and after a fault section is determined, the DC load switches on two sides of the fault section are disconnected; after the direct current line fault is isolated, the interconnection switch is closed, and the load after the fault point is put into a standby power supply and is supplied with power by the adjacent converter line; meanwhile, the converter is quickly restarted by using the energy storage equipment, and the load power supply to the fault point is recovered; dispatching power maintenance personnel to remove the fault at a fixed point on the site according to the fault positioning result; and after the fault is cleared, performing manual switching operation to restore the normal operation mode of the direct-current distribution line.
As shown in fig. 2, the scheme of the present invention is applied to a multi-segment multi-connection dc distribution network, each dc distribution line is a single-circuit dc radial distribution line, and adopts a segmented structure with a branch load. The head end of the line is a measuring point, namely the measuring point is arranged at the outlet of the converter, and the measuring point samples voltage and current in real time at high frequency. In a direct-current power distribution network without a direct-current breaker, a closed-loop structure breaks down when running, and power supply can be restored only by opening a system loop; on the other hand, the fault current can be limited only after all converters in the whole network are locked. And the multi-section multi-contact power distribution network only needs to lock one converter but not all converters, the load switch can remove the fault at an earlier moment, the corresponding converter unlocking time is shorter, and the fault recovery speed is higher. And by combining factors such as investment cost, protection difficulty and the like, the direct-current power distribution network topology without the direct-current circuit breaker is suitable for adopting a multi-section multi-connection structure. The working modes of the multi-section multi-contact direct-current power distribution network are mainly divided into a normal working mode and a fault working mode. Under the normal working mode, the interconnection switch is in the disconnection position, and the multi-section multi-interconnection type direct current power distribution network can be divided into three single-power-supply radiation type direct current lines which independently run.
As shown in fig. 3, the dc distribution line fault is exemplified by a short-circuit fault occurring in the section BC. After the short-circuit fault occurs in the section BC, the measurement point a detects the occurrence of the fault. After the fault is judged to occur, the protection gives a turn-off instruction to the current converter, the current converter acts to block an alternating current system from feeding fault current to a fault point, fault development is inhibited, all sections corresponding to the ABCD are power-off, and after the fault section is determined to be BC, direct current load switches on two sides of the BC are disconnected. Therefore, the timing sequence of the dc line fault isolation is specifically as follows: the method comprises the steps of detecting a direct-current line fault by a protection measuring point, protecting a converter from sending a turn-off instruction, receiving an instruction by the converter, turning off the converter, sending an injection signal by the converter, judging a fault section by the protection according to information of the measuring point, sending a turn-off instruction to a corresponding load switch, receiving an instruction by the load switch, and turning on and off the load switch. The quick fault isolation and recovery of the direct-current distribution line can be realized through the matching of the blocking type current converter, the direct-current load switch and the interconnection switch.
As shown in fig. 4, after the line BC is cut off, the interconnection switches of the system 1 and the system 2 are closed, and the system 2 supplies power to the dc load originally belonging to the system 1, that is, the system 2 starts to supply power to the line CD, and the direction of the power flow of the line CD changes. The system 3 which has not failed is still operating normally independently. The power supply of the load of the line on the side is supplied by the power supply on the opposite side, so that the power failure range of the direct current distribution line can be reduced, and the power supply reliability can be improved. And meanwhile, the converter is quickly restarted by using the energy storage equipment, and the load power supply to the fault point is recovered. And then arranging power maintenance personnel to go to a site fixed point to remove the permanent fault according to the fault positioning result, and after the fault is removed, performing switching operation to enable the direct-current distribution line to return to a normal operation mode.
Before the fault is cleared, the tie switch between system 1 and system 2 is closed, during which time the system 2 may again experience a dc line fault. If a fault occurs again, no matter whether the fault occurs on a line (line CD) with changed power flow direction or not, the interconnection switch is switched off, so that the system 2 becomes an original single-power radial structure, and then switching operation is carried out according to a direct-current line fault isolation and recovery strategy.
The timing of the dc line fault recovery is therefore as follows: once the direct current fault occurs, the load with high power supply reliability requirement is disconnected from the power grid and seamlessly switched to the energy storage device for power supply, and other loads lose power in a short time. After the direct current fault is isolated, the interconnection switch is closed, and the load behind the fault point is supplied with power by the adjacent converter circuit; and meanwhile, the converter after being blocked is quickly restarted by using the energy storage equipment, and the load power supply before the fault point is recovered. And after the converter which executes the fault blocking operates again, when the fault section recovers to be normal, the converter and the adjacent converter circuit operate in a loop closing mode, the load is switched, and the normal operation mode is recovered.
When the direct current distribution line has a fault, the relay protection carries out fault detection to correctly detect the fault in the line area; after the fault detection is finished, the converter is locked, the whole line is powered off, the fault location is carried out by using the locating device, the fault section is identified according to the locating result, and the fault position is obtained, so that the difficulty and the workload of permanent fault removal are greatly reduced by the fault location; after the measuring point detects the fault of the direct current line, the protection sends a blocking instruction to the load switch, the load switch receives the instruction, and the direct current load switches on two sides of the fault section are disconnected; after the direct current line fault is isolated, the interconnection switch is closed, and the load after the fault point is put into a standby power supply and is supplied with power by the adjacent converter line; meanwhile, the converter is quickly restarted by using the energy storage equipment, and the load power supply to the fault point is recovered; dispatching power maintenance personnel to remove the fault at a fixed point on the site according to the fault positioning result; and after the fault is cleared, performing manual switching operation to restore the normal operation mode of the direct-current distribution line.
The multi-section multi-contact direct current distribution network combines the advantages of a radiation structure and an annular structure, improves the reliability of power supply, and simultaneously keeps independent operation of each direct current line as far as possible. Therefore, the direct-current power distribution network topology without the direct-current circuit breaker adopts a multi-section multi-connection structure. When the direct current distribution network operates normally, each line operates independently and does not interfere with each other. When the direct current distribution line has a fault, the protection detects the fault and isolates the fault, and meanwhile, the line is switched from a normal working mode to a fault working mode, and the process is called fault isolation. After the fault is cleared, the line is changed from the fault operation mode to the normal operation mode, and the process is called fault recovery. Line fault isolation and fault recovery are closely related to the on and off states of the tie switches.
The quick fault isolation and recovery of the direct-current distribution line can be realized through the matching of the blocking type current converter, the direct-current load switch and the interconnection switch.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. A method for power supply recovery after a flexible direct current distribution line fault based on an injection signal is characterized by comprising the following steps: the method comprises the following steps:
a fault detection step, wherein after the direct current distribution line has a fault, the relay protection carries out fault detection to correctly detect the fault in the line area;
a power failure positioning step, namely after the fault detection is finished, locking the current converter, powering down the whole line, positioning the fault by using a positioning device, identifying a fault section according to a positioning result and obtaining a fault position;
blocking, namely after detecting a direct current line fault by a measuring point, protecting to send a blocking instruction to a load switch, receiving the instruction by the load switch, and disconnecting direct current load switches on two sides of a fault section;
a standby power supply step, namely after the fault of the direct current line is isolated, switching on a contact switch, putting a load behind a fault point into a standby power supply, and supplying power by an adjacent converter circuit; meanwhile, the converter is quickly restarted by using the energy storage equipment, and the load power supply to the fault point is recovered;
a step of maintenance and troubleshooting, in which power maintenance personnel are dispatched to the site to remove the fault at a fixed point according to the fault positioning result; and after the fault is cleared, performing manual switching operation to restore the normal operation mode of the direct-current distribution line.
2. The method for power restoration after the fault of the flexible direct current distribution line based on the injection signal as claimed in claim 1, wherein the method comprises the following steps: the fault detection method used in the fault detection step is a current protection method, a pilot protection method or a boundary protection method.
3. The method for power restoration after the fault of the flexible direct current distribution line based on the injection signal as claimed in claim 1, wherein the method comprises the following steps: and fault location in the power failure location step adopts an impedance method, a single-ended traveling wave method or a double-ended traveling wave method.
4. The method for power restoration after the fault of the flexible direct current distribution line based on the injection signal as claimed in claim 1, wherein the method comprises the following steps: the fault detection step comprises a current limiting isolation step, wherein a blocking type converter is used for current limiting, the blocking type converter can feed fault current into a fault point through a submodule blocking alternating current system so as to reduce short-circuit current, and then fault section selection is carried out.
5. The method for power restoration after the fault of the flexible direct current distribution line based on the injection signal as claimed in claim 4, wherein the method comprises the following steps: and in the current limiting and isolating step, after the direct current distribution line has a fault, the protection detects the fault and isolates the fault, and meanwhile, the line is switched from a normal working mode to a fault working mode.
6. The method of claim 5 for power restoration after the fault of the flexible direct current distribution line based on the injected signal, wherein the method comprises the following steps: the direct current distribution line is one or more of three-section three-connection, three-section four-connection or four-section three-connection.
7. The method for power restoration after the fault of the flexible direct current distribution line based on the injection signal as claimed in claim 1, wherein the method comprises the following steps: the DC distribution line is controlled to be quickly blocked and restored by matching the blocking type current converter with the DC load switch and the interconnection switch.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116073523A (en) * | 2023-03-14 | 2023-05-05 | 广东电网有限责任公司梅州供电局 | Power supply system, low-voltage distribution line monitoring method and monitoring device thereof |
| CN118508385A (en) * | 2024-07-18 | 2024-08-16 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Flexible direct-current distribution line fault processing method and system and electronic equipment |
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| CN118508385A (en) * | 2024-07-18 | 2024-08-16 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Flexible direct-current distribution line fault processing method and system and electronic equipment |
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