CN117913757A - Fault isolation method, device, control equipment and storage medium for power grid - Google Patents
Fault isolation method, device, control equipment and storage medium for power grid Download PDFInfo
- Publication number
- CN117913757A CN117913757A CN202311870824.XA CN202311870824A CN117913757A CN 117913757 A CN117913757 A CN 117913757A CN 202311870824 A CN202311870824 A CN 202311870824A CN 117913757 A CN117913757 A CN 117913757A
- Authority
- CN
- China
- Prior art keywords
- transformer substation
- bus
- time
- frequency
- section
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 44
- 238000004590 computer program Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 230000003993 interaction Effects 0.000 claims description 14
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 230000006870 function Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H02H7/28—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 meshed systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application is suitable for the technical field of power and provides a fault isolation method, device, control equipment and storage medium of a power grid. The fault isolation method of the power grid is applied to first control equipment of a transformer substation, and comprises the following steps: acquiring bus voltage and bus frequency of a transformer substation; determining whether the transformer substation has faults according to the bus voltage and the bus frequency; and if the transformer substation fails, transmitting a tripping instruction to second control equipment of the distributed power supply connected with the transformer substation so as to instruct the second control equipment to control the distributed power supply to perform tripping operation. By the fault isolation method of the power grid, whether the transformer substation has faults or not can be determined, if the transformer substation has faults, the distributed power supply can be enabled to carry out tripping operation by sending the tripping instruction, so that the distributed power supply can be effectively isolated when the power grid has faults, and the safety of overhauling the power grid is improved.
Description
Technical Field
The application belongs to the technical field of electric power, and particularly relates to a fault isolation method, device, control equipment and storage medium of a power grid.
Background
Currently, large-scale distributed power sources (such as new energy sources) are connected to the power grid. When the power grid breaks down and needs to be overhauled, if all the distributed power sources cannot be effectively isolated, potential safety hazards are caused to overhauling personnel of the power grid, and the safety of overhauling the power grid is reduced.
Disclosure of Invention
In view of the above, the embodiments of the present application provide a fault isolation method, apparatus, control device and storage medium for a power grid, so as to solve the technical problem of reduced safety in overhauling the power grid caused by the fact that all distributed power sources cannot be effectively isolated.
In a first aspect, an embodiment of the present application provides a fault isolation method for a power grid applied to a first control device of a substation, where the method includes:
Acquiring bus voltage and bus frequency of the transformer substation;
Determining whether the transformer substation has faults according to the bus voltage and the bus frequency;
And if the transformer substation fails, sending a tripping instruction to second control equipment of the distributed power supply connected with the transformer substation so as to instruct the second control equipment to control the distributed power supply to perform tripping operation.
Optionally, the determining whether the transformer substation fails according to the bus voltage and the bus frequency includes:
Determining whether the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage or two-section two-time bus overvoltage according to the bus voltage, and determining whether the transformer substation has two-section two-time low frequency or two-section two-time overfrequency according to the bus frequency;
And if the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage, two-section two-time bus overvoltage, two-section two-time low frequency or two-section two-time overfrequency, determining that the transformer substation has faults.
Optionally, the determining whether the transformer substation has two-stage two-time low voltage according to the bus voltage includes:
If the bus voltage is continuously greater than a first preset voltage threshold value in a first preset time and is smaller than the first preset voltage threshold value in a first current time, and a bus of the transformer substation is not disconnected, determining that the transformer substation has a first low voltage section in the first current time;
After the first section of low voltage occurs in the transformer substation, if the bus voltage is continuously greater than the first preset voltage threshold value in the first preset time and is smaller than the second preset voltage threshold value in the second current time, and the bus of the transformer substation is not broken, determining that the transformer substation has two sections and two time limits of low voltage in the second current time.
Optionally, the determining, according to the bus frequency, whether the substation has two-section two-time-limit low frequency includes:
If the bus frequency is continuously greater than a first preset frequency threshold value in a second preset time and is smaller than the first preset frequency threshold value in a third current time, and a bus of the transformer substation is not disconnected, determining that a first section of low frequency occurs in the transformer substation in the third current time;
After the first section of low frequency occurs in the transformer substation, if the bus frequency is continuously larger than the first preset frequency threshold value in the second preset time and smaller than the second preset frequency threshold value in the fourth current time, and the bus of the transformer substation is not disconnected, determining that two sections of two-time-limit low frequency occurs in the transformer substation in the fourth current time.
Optionally, the method further comprises:
acquiring a first switch position of the distributed power supply on a power supply side and a second switch position of the distributed power supply on a transformer substation side, which are acquired by the second control equipment;
And if the first switch position is inconsistent with the second switch position, outputting an abnormal alarm signal.
Optionally, the method further comprises:
Receiving first data of the distributed power supply sent by the second control equipment; wherein the first data includes first switching amount information describing the first switching position;
and determining whether the power grid fails according to the first data, the bus voltage and the bus frequency.
Optionally, the method further comprises:
acquiring second data, wherein the second data comprises second switching value information for describing the second switching position;
if the power grid does not fail and the first switching value information and the second switching value information are not changed, reducing the data interaction rate with the second control equipment;
and if the power grid fails or the first switching value information and the second switching value information change, improving the data interaction rate with the second control equipment.
In a second aspect, an embodiment of the present application provides a fault isolation apparatus for a power grid, applied to a first control device of a substation, where the apparatus includes:
The first acquisition unit is used for acquiring bus voltage and bus frequency of the transformer substation;
The fault determining unit is used for determining whether the transformer substation has faults according to the bus voltage and the bus frequency;
And the instruction sending unit is used for sending a tripping instruction to second control equipment of the distributed power supply connected with the transformer substation if the transformer substation fails, so as to instruct the second control equipment to control the distributed power supply to perform tripping operation.
In a third aspect, an embodiment of the present application provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing steps in the fault isolation method of the electrical network according to any one of the first aspect when the computer program is executed by the processor.
In a fourth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the fault isolation method of an electrical network as described in any one of the first aspects above.
In a fifth aspect, an embodiment of the application provides a computer program product for, when run on a terminal device, causing the terminal device to perform the steps of the fault isolation method of a power network as described in any of the first aspects above.
The fault isolation method, the fault isolation device, the control equipment and the storage medium for the power grid provided by the embodiment of the application have the following beneficial effects:
In the fault isolation method of the power grid provided by the embodiment of the application, firstly, the bus voltage and the bus frequency of the transformer substation are obtained, then, whether the transformer substation breaks down or not is determined according to the bus voltage and the bus frequency, and if the transformer substation breaks down, a tripping instruction is sent to second control equipment of a distributed power supply connected with the transformer substation so as to instruct the second control equipment to control the distributed power supply to carry out tripping operation. By the fault isolation method of the power grid, whether the transformer substation has faults or not can be determined, if the transformer substation has faults, the distributed power supplies can be enabled to carry out tripping operation by sending the tripping instruction, so that each distributed power supply connected with the power grid can be controlled to carry out tripping operation when the power grid has faults, the distributed power supplies can be effectively isolated, and the safety of overhauling the power grid is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an implementation of a fault isolation method of a power grid according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of a fault isolation apparatus for a power grid according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a control device according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used in the embodiments of the application is for the purpose of describing particular embodiments of the application only, and is not intended to be limiting of the application. In the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more, and "at least one", "one or more" means one, two or more. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The execution main body of the fault isolation method of the power grid provided by the embodiment of the application can be first control equipment of a transformer substation.
The fault isolation method of the power grid provided by the embodiment of the application can be applied to the power grid comprising a transformer substation and a plurality of distributed power sources. Specifically, when the power grid is required to be subjected to fault isolation, the first control equipment arranged at the transformer substation can be used for executing the steps of the fault isolation method of the power grid provided by the embodiment of the application, so that whether the transformer substation breaks down or not can be determined, and when the transformer substation breaks down, a tripping instruction is sent to enable the distributed power supply to perform tripping operation, and finally, the safety of overhauling the power grid is effectively improved.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a fault isolation method for a power grid according to an embodiment of the present application, where the fault isolation method for a power grid may include S101 to S103, which are described in detail as follows:
in S101, a bus voltage and a bus frequency of the substation are acquired.
In the embodiment of the application, the first control equipment can acquire the bus voltage and the bus frequency of the transformer substation in real time. The specific method for obtaining the bus voltage and the bus frequency of the substation is not limited herein.
In S102, it is determined whether the substation is malfunctioning according to the bus voltage and the bus frequency.
In the embodiment of the application, after the first control device obtains the bus voltage and the bus frequency of the transformer substation, whether the transformer substation has faults or not can be determined according to the bus voltage and the bus frequency of the transformer substation.
In one possible implementation, it may be determined by steps a to b whether the substation is faulty according to the bus voltage and the bus frequency of the substation. The details are as follows:
In the step a, according to the bus voltage, determining whether the transformer substation has two-section two-time-limit zero-sequence overvoltage, two-section two-time-limit low voltage or two-section two-time-limit bus overvoltage, and according to the bus frequency, determining whether the transformer substation has two-section two-time-limit low frequency or two-section two-time-limit overfrequency.
In the implementation mode, the first control device can determine whether two-section two-time zero sequence overvoltage, two-section two-time low voltage or two-section two-time bus overvoltage occurs in the transformer substation according to the bus voltage of the transformer substation; the first control device can also determine whether two-section two-time-period low frequency or two-section two-time-period over-frequency occurs in the transformer substation according to the bus frequency of the transformer substation.
Wherein, it can confirm whether the transformer substation appears two-section two-time limit low voltage through step c. The details are as follows:
In the step c, if the bus voltage is continuously greater than a first preset voltage threshold value in a first preset time and is smaller than the first preset voltage threshold value in a first current time, and a bus of the transformer substation is not disconnected, determining that the transformer substation has a first low voltage section in the first current time;
After the first section of low voltage of the transformer substation occurs, if the bus voltage is continuously larger than a first preset voltage threshold value in a first preset time and smaller than a second preset voltage threshold value in a second current time, and the bus of the transformer substation is not broken, determining that the transformer substation has two sections of two-time-limit low voltage in the second current time.
Wherein the first preset voltage threshold is greater than the second preset voltage threshold; the first current time is after the bus voltage is continuously greater than a first preset voltage threshold value for a first time within a first preset time and before the second current time; the second current time is after the bus voltage is continuously greater than the first preset voltage threshold value for the second time within the first preset time, and is after the first current time; the specific values of the first preset time, the first preset voltage threshold and the second preset voltage threshold can be set according to actual requirements, and are not limited herein.
For example, the first preset time may be 1 second, the first preset voltage threshold may be 70 volts, the second preset voltage threshold may be 40 volts, and the bus voltage may be specifically a three-phase voltage of the bus voltages. Based on the above, if the three-phase line voltage in the bus voltage is continuously more than 70 volts in 1 second, and the first current time is less than 70 volts, and the bus of the transformer substation is not disconnected, determining that the transformer substation has first low voltage at the first current time; after the first section of low voltage occurs in the transformer substation, if the three-phase line voltage in the bus voltage is continuously greater than 70 volts within 1 second, and when the second current time is less than 40 volts and the bus of the transformer substation is not disconnected, determining that the second section of low voltage occurs in the transformer substation at the second current time, namely determining that the two sections of two-time-limit low voltage occurs in the transformer substation.
In practical application, the position of the voltage-variable air switch can be judged through the first control equipment, and a voltage slip locking low-voltage disconnection function is arranged in the first control equipment, so that low-voltage disconnection operation when a voltage transformer is disconnected on a bus of a transformer substation is prevented, namely, when the voltage transformer is disconnected on the bus of the transformer substation, subsequent tripping instruction sending operation is not performed.
Wherein, can confirm whether the transformer substation appears two-section two-time limit low frequency through step d. The details are as follows:
In the step d, if the bus frequency is continuously greater than a first preset frequency threshold value in a second preset time and is smaller than the first preset frequency threshold value in a third current time, and a bus of the transformer substation is not disconnected, determining that the transformer substation has a first section of low frequency in the third current time;
After the first section of low frequency occurs in the transformer substation, if the bus frequency is continuously greater than a first preset frequency threshold value in a second preset time and is smaller than a second preset frequency threshold value in a fourth current time, and the bus of the transformer substation is not disconnected, determining that two sections of two-time-limit low frequency occurs in the transformer substation in the fourth current time.
Wherein the first preset frequency threshold is greater than the second preset frequency threshold; the third current time is after the bus frequency is continuously greater than the first preset frequency threshold value for the first time in the second preset time and before the fourth current time; the fourth current time is after the bus frequency is continuously greater than the first preset frequency threshold value for the second time in the second preset time, and is after the third current time; the specific values of the second preset time, the first preset frequency threshold and the second preset frequency threshold can be set according to actual requirements, and are not limited herein.
For example, the second preset time may be 1 second, the first preset frequency threshold may be 48.5 hertz, and the second preset frequency threshold may be 48 hertz. Based on the above, if the busbar frequency is continuously greater than 48.5 Hz within 1 second and is less than 48.5 Hz in the third current time, and the frequency measurement loop of the transformer substation works normally, determining that the first section of low frequency occurs in the transformer substation in the third current time. After the first section of low frequency appears in the transformer substation, if the bus frequency is continuously greater than 48.5 Hz in 1 second and is less than 48 Hz in the fourth current time, and the frequency measurement loop of the transformer substation works normally, determining that the second section of low frequency appears in the transformer substation in the fourth current time, namely determining that the two sections of two-time-limit low frequency appear in the transformer substation.
In practical application, whether the frequency measurement loop of the transformer substation works normally can be judged through the voltage of the bus AB line. For example, if the voltage of the bus AB line is lower than 15V, the frequency measurement loop of the transformer substation may be considered to work abnormally, otherwise, the frequency measurement loop of the transformer substation may be considered to work normally. When the frequency measurement loop of the transformer substation works abnormally, the follow-up tripping instruction sending action is not performed.
In the step b, if the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage, two-section two-time bus overvoltage, two-section two-time low frequency or two-section two-time overfrequency, determining that the transformer substation has faults.
In this implementation manner, if the first control device determines that any one or more of two-section two-time-limit zero-sequence overvoltage, two-section two-time-limit low voltage, two-section two-time-limit bus overvoltage, two-section two-time-limit low frequency and two-section two-time-limit overfrequency occur in the transformer substation, the first control device may determine that the transformer substation fails.
In S103, if the substation fails, a trip instruction is sent to a second control device of the distributed power supply connected to the substation, so as to instruct the second control device to control the distributed power supply to perform a trip operation.
In the embodiment of the application, after the first control device determines that the transformer substation has a fault, the first control device can send a tripping instruction to the second control device of the distributed power supply connected with the transformer substation so as to instruct the second control device to control the distributed power supply to perform tripping operation.
In practical application, the first control device may send a trip instruction at a third preset time after determining that the first low voltage section (i.e., the first current time) occurs in the substation; the first control device may send the trip instruction at a fourth preset time after determining that the second low voltage (i.e., the second current time) occurs in the substation. Wherein the third preset time is longer than the fourth preset time.
Illustratively, the third preset time may be 1.2 seconds and the fourth preset time may be 0.2 seconds; based on this, the first control device transmits a trip instruction 1.2 seconds after determining that the first low voltage (i.e., the first current time) occurs; the first control device transmits a trip command 0.2 seconds after determining that the second low voltage (i.e., the second current time) occurs.
In practical application, the first control device may send a trip instruction at a fifth preset time after determining that the first low frequency section (i.e., the third current time) occurs in the substation; the first control device may send the trip instruction at a sixth preset time after determining that the second low frequency (i.e., the fourth current time) occurs in the substation. Wherein the fifth preset time is longer than the sixth preset time.
Illustratively, the fifth preset time may be 60 seconds, and the sixth preset time may be 10 seconds; based on this, the first control device transmits a trip instruction 60 seconds after determining that the first low frequency (i.e., the third current time) occurs; the first control device transmits a trip command 10 seconds after determining that the second low frequency (i.e., the fourth current time) occurs.
In practical application, the number of the distributed power sources connected with the transformer substation may be multiple, and each distributed power source may correspond to one second control device, based on this, the first control device may send a trip instruction to the second control devices corresponding to the distributed power sources connected with the transformer substation, so as to instruct each second control device to control the corresponding distributed power source to perform a trip operation.
In practical application, a soft pressing plate for zero-sequence overvoltage disconnection, a hard pressing plate for zero-sequence overvoltage disconnection and a control word for zero-sequence overvoltage disconnection can be arranged in the first control equipment, so that the first control equipment can disconnect the distributed power supply when determining that two sections of two-time-limit zero-sequence overvoltage occurs in the transformer substation.
In practical application, a "low-voltage disconnection" soft pressing plate, a "low-voltage disconnection" hard pressing plate and a "low-voltage disconnection" control word can be arranged in the first control equipment, so that the first control equipment can disconnect the distributed power supply when determining that two sections of two-time-limit low voltages occur in the transformer substation.
In practical application, a soft pressing plate for busbar overvoltage disconnection, a hard pressing plate for busbar overvoltage disconnection and a control word for busbar overvoltage disconnection can be arranged in the first control equipment, so that the first control equipment can disconnect the distributed power supply when determining that two sections of two-time-limit busbar overvoltage occurs in the transformer substation.
In practical application, a "low-frequency disconnection" soft pressing plate, a "low-frequency disconnection" hard pressing plate and a "low-frequency disconnection" control word can be arranged in the first control equipment, so that the first control equipment can disconnect the distributed power supply when determining that two sections of two-time-limit low frequencies occur in the transformer substation.
In practical application, an over-frequency disconnection soft pressing plate, an over-frequency disconnection hard pressing plate and an over-frequency disconnection control word can be arranged in the first control equipment, so that the first control equipment can disconnect the distributed power supply when determining that two sections of the transformer substation have over-frequency with two time limits.
In practical application, the first control device may send a trip instruction to the second control device corresponding to each distributed power source connected to the substation through 5G (fifth generation mobile communication technology). Specifically, a power-dedicated 5G network card with a fixed address for communication may be configured in both the first control device and the second control device, and a communication connection may be established between the first control device and the second control device through the 5G network card.
It can be seen from the foregoing that, in the fault isolation method for a power grid provided by the embodiment of the present application, the bus voltage and the bus frequency of the substation are obtained first, then, whether the substation fails or not is determined according to the bus voltage and the bus frequency, and if the substation fails, a trip instruction is sent to a second control device of a distributed power source connected to the substation, so as to instruct the second control device to control the distributed power source to perform a trip operation. By the fault isolation method of the power grid, whether the transformer substation has faults or not can be determined, if the transformer substation has faults, the distributed power supplies can be enabled to carry out tripping operation by sending the tripping instruction, so that each distributed power supply connected with the power grid can be controlled to carry out tripping operation when the power grid has faults, the distributed power supplies can be effectively isolated, and the safety of overhauling the power grid is improved.
In a possible implementation manner, the fault isolation method for the power grid provided by the embodiment of the application further may include steps e to f. The details are as follows:
In step e, a first switch position of the distributed power supply on the power supply side and a second switch position of the distributed power supply on the transformer substation side, which are acquired by the second control equipment, are acquired.
In this implementation manner, the second control device may collect the first switch position of the distributed power supply at the power supply side and send the first switch position to the first control device through the 5G network card, and in addition, the first control device may also directly obtain the second switch position of the distributed power supply at the substation side.
In step f, if the first switch position is inconsistent with the second switch position, outputting an abnormal alarm signal.
In this implementation manner, if the first control device determines that the first switch position is inconsistent with the second switch position, the first control device outputs an abnormal alarm signal.
For example, if the second switch position of the distributed power supply on the substation side is in an open state, and if the first switch position of the distributed power supply on the power supply side acquired by the second control device is in a closed state, the first control device may output an abnormal alarm signal to prompt a user to overhaul.
In a possible implementation manner, the fault isolation method for the power grid provided by the embodiment of the application further may include steps g to h. The details are as follows:
In step g, first data of the distributed power supply transmitted by the second control device is received.
In this implementation manner, the second control device may collect the first data of the distributed power supply, and send the first data to the first control device through the 5G network card, and the first control device may receive the first data of the distributed power supply sent by the second control device.
Wherein the first data includes first switching amount information describing a first switching position. Specifically, the first data includes first switching amount information for describing a first switching position of the distributed power supply on the power supply side.
In step h, determining whether the power grid fails according to the first data, the bus voltage and the bus frequency.
In this implementation manner, the first control device may determine whether the power grid fails according to the first data of the distributed power source, the bus voltage of the substation, and the bus frequency of the substation.
In a possible implementation manner, the fault isolation method for the power grid provided by the embodiment of the application further may include step i to step k. The details are as follows:
in step i, second data is acquired.
Wherein the second data comprises second switching value information describing a second switching position. In particular, the second data comprises second switching value information describing a second switching position of the distributed power supply on the substation side.
In this implementation manner, the first control device may directly acquire the second switching value information for describing the second switching position of the distributed power supply on the substation side.
In step j, if the power grid has not failed and the first switching value information and the second switching value information have not changed, the data interaction rate with the second control device is reduced.
In this implementation manner, if the first control device determines that the power grid has not failed and the first switching value information and the second switching value information have not changed, the data interaction rate with the second control device is reduced. That is, if the first control device determines that the power grid has not failed and the first switching value information and the second switching value information have not changed, the first control device and the second control device perform data interaction through a low interaction rate.
In step k, if the power grid fails or the first switching value information and the second switching value information change, the data interaction rate with the second control device is increased.
In this implementation manner, if the first control device determines that the power grid fails or the first switching value information and the second switching value information change, the data interaction rate with the second control device is increased. That is, if the first control device determines that the power grid fails or the first switching value information and the second switching value information change, the first control device and the second control device perform data interaction through a high interaction rate.
Based on the fault isolation method of the power grid provided by the embodiment, the embodiment of the application further provides a fault isolation device of the power grid for realizing the embodiment of the method, please refer to fig. 2, and fig. 2 is a schematic structural diagram of the fault isolation device of the power grid provided by the embodiment of the application. As shown in fig. 2, the fault isolation apparatus 20 of the power grid may include: a first acquisition unit 21, a failure determination unit 22, and an instruction transmission unit 23.
Wherein:
the first acquisition unit 21 is used for acquiring the bus voltage and the bus frequency of the substation.
The fault determining unit 22 is configured to send a trip instruction to a second control device of the distributed power supply connected to the substation, so as to instruct the second control device to control the distributed power supply to perform a trip operation if the substation fails.
The fault determining unit 22 is configured to send a trip instruction to a second control device of the distributed power supply connected to the substation, so as to instruct the second control device to control the distributed power supply to perform a trip operation if the substation fails.
Optionally, the fault determining unit 22 is specifically configured to:
Determining whether the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage or two-section two-time bus overvoltage according to the bus voltage, and determining whether the transformer substation has two-section two-time low frequency or two-section two-time overfrequency according to the bus frequency;
And if the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage, two-section two-time bus overvoltage, two-section two-time low frequency or two-section two-time overfrequency, determining that the transformer substation has faults.
Optionally, the fault determining unit 22 is specifically configured to:
If the bus voltage is continuously greater than a first preset voltage threshold value in a first preset time and is smaller than the first preset voltage threshold value in a first current time, and a bus of the transformer substation is not disconnected, determining that the transformer substation has a first low voltage section in the first current time;
After the first section of low voltage occurs in the transformer substation, if the bus voltage is continuously greater than the first preset voltage threshold value in the first preset time and is smaller than the second preset voltage threshold value in the second current time, and the bus of the transformer substation is not broken, determining that the transformer substation has two sections and two time limits of low voltage in the second current time.
Optionally, the fault determining unit 22 is specifically configured to:
If the bus frequency is continuously greater than a first preset frequency threshold value in a second preset time and is smaller than the first preset frequency threshold value in a third current time, and a bus of the transformer substation is not disconnected, determining that a first section of low frequency occurs in the transformer substation in the third current time;
After the first section of low frequency occurs in the transformer substation, if the bus frequency is continuously larger than the first preset frequency threshold value in the second preset time and smaller than the second preset frequency threshold value in the fourth current time, and the bus of the transformer substation is not disconnected, determining that two sections of two-time-limit low frequency occurs in the transformer substation in the fourth current time.
Optionally, the fault isolation apparatus 20 of the power grid may further be configured to:
acquiring a first switch position of the distributed power supply on a power supply side and a second switch position of the distributed power supply on a transformer substation side, which are acquired by the second control equipment;
And if the first switch position is inconsistent with the second switch position, outputting an abnormal alarm signal.
Optionally, the fault isolation apparatus 20 of the power grid may further be configured to:
Receiving first data of the distributed power supply sent by the second control equipment; wherein the first data includes first switching amount information describing the first switching position;
and determining whether the power grid fails according to the first data, the bus voltage and the bus frequency.
Optionally, the fault isolation apparatus 20 of the power grid may further be configured to:
acquiring second data, wherein the second data comprises second switching value information for describing the second switching position;
if the power grid does not fail and the first switching value information and the second switching value information are not changed, reducing the data interaction rate with the second control equipment;
and if the power grid fails or the first switching value information and the second switching value information change, improving the data interaction rate with the second control equipment.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a control device according to an embodiment of the present application. As shown in fig. 3, the control apparatus 3 provided in the present embodiment may include: a processor 30, a memory 31 and a computer program 32 stored in the memory 31 and executable on the processor 30, such as a program corresponding to a fault isolation method of a power grid. The steps in the fault isolation method embodiment described above for the power grid are implemented when the processor 30 executes the computer program 32, such as S101-S104 shown in fig. 1. Or the processor 30, when executing the computer program 32, performs the functions of the modules/units of the fault isolation apparatus embodiment of the electrical network described above, such as the functions of the units 21-23 shown in fig. 2.
By way of example, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program 32 in the control device 3. For example, the computer program 32 may be divided into the first obtaining unit 21, the fault determining unit 22 and the instruction sending unit 23, and the specific functions of the respective units are described in the corresponding embodiment of fig. 2, which is not repeated here.
It will be appreciated by those skilled in the art that fig. 3 is merely an example of the control device 3 and does not constitute a limitation of the control device 3, and may include more or fewer components than shown, or may combine certain components, or may be different components.
The processor 30 may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, dsps), application specific integrated circuits (asics), off-the-shelf programmable gate arrays (fpgas) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the control device 3, such as a hard disk or a memory of the control device 3. The memory 31 may also be an external storage device of the control device 3, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, or a flash memory card (FLASH CARD) provided on the control device 3. Further, the memory 31 may also include both an internal storage unit of the control device 3 and an external storage device. The memory 31 is used to store computer programs and other programs and data required to control the apparatus. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units is illustrated, and in practical application, the above-mentioned functional allocation may be performed by different functional units according to needs, that is, the internal structure of the fault isolation apparatus of the power grid is divided into different functional units, so as to perform all or part of the above-mentioned functions. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when executed by a processor, performs the steps of the respective method embodiments described above.
The embodiments of the present application provide a computer program product for causing a terminal device to carry out the steps of the respective method embodiments described above when the computer program product is run on the terminal device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A fault isolation method of an electric network, applied to a first control device of a transformer substation, characterized in that the method comprises:
Acquiring bus voltage and bus frequency of the transformer substation;
Determining whether the transformer substation has faults according to the bus voltage and the bus frequency;
And if the transformer substation fails, sending a tripping instruction to second control equipment of the distributed power supply connected with the transformer substation so as to instruct the second control equipment to control the distributed power supply to perform tripping operation.
2. The method of claim 1, wherein said determining whether the substation is malfunctioning based on the bus voltage and the bus frequency comprises:
Determining whether the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage or two-section two-time bus overvoltage according to the bus voltage, and determining whether the transformer substation has two-section two-time low frequency or two-section two-time overfrequency according to the bus frequency;
And if the transformer substation has two-section two-time zero sequence overvoltage, two-section two-time low voltage, two-section two-time bus overvoltage, two-section two-time low frequency or two-section two-time overfrequency, determining that the transformer substation has faults.
3. The method of claim 2, wherein determining whether the substation has a two-stage two-time period low voltage based on the bus voltage comprises:
If the bus voltage is continuously greater than a first preset voltage threshold value in a first preset time and is smaller than the first preset voltage threshold value in a first current time, and a bus of the transformer substation is not disconnected, determining that the transformer substation has a first low voltage section in the first current time;
After the first section of low voltage occurs in the transformer substation, if the bus voltage is continuously greater than the first preset voltage threshold value in the first preset time and is smaller than the second preset voltage threshold value in the second current time, and the bus of the transformer substation is not broken, determining that the transformer substation has two sections and two time limits of low voltage in the second current time.
4. The method of claim 2, wherein determining whether the substation exhibits a two-period, two-time, low frequency based on the bus frequency comprises:
If the bus frequency is continuously greater than a first preset frequency threshold value in a second preset time and is smaller than the first preset frequency threshold value in a third current time, and a bus of the transformer substation is not disconnected, determining that a first section of low frequency occurs in the transformer substation in the third current time;
After the first section of low frequency occurs in the transformer substation, if the bus frequency is continuously larger than the first preset frequency threshold value in the second preset time and smaller than the second preset frequency threshold value in the fourth current time, and the bus of the transformer substation is not disconnected, determining that two sections of two-time-limit low frequency occurs in the transformer substation in the fourth current time.
5. The method according to any one of claims 1 to 4, further comprising:
acquiring a first switch position of the distributed power supply on a power supply side and a second switch position of the distributed power supply on a transformer substation side, which are acquired by the second control equipment;
And if the first switch position is inconsistent with the second switch position, outputting an abnormal alarm signal.
6. The method as recited in claim 5, further comprising:
Receiving first data of the distributed power supply sent by the second control equipment; wherein the first data includes first switching amount information describing the first switching position;
and determining whether the power grid fails according to the first data, the bus voltage and the bus frequency.
7. The method as recited in claim 6, further comprising:
acquiring second data, wherein the second data comprises second switching value information for describing the second switching position;
if the power grid does not fail and the first switching value information and the second switching value information are not changed, reducing the data interaction rate with the second control equipment;
and if the power grid fails or the first switching value information and the second switching value information change, improving the data interaction rate with the second control equipment.
8. A fault isolation apparatus for an electrical network, applied to a first control device of a substation, the apparatus comprising:
The first acquisition unit is used for acquiring bus voltage and bus frequency of the transformer substation;
The fault determining unit is used for determining whether the transformer substation has faults according to the bus voltage and the bus frequency;
And the instruction sending unit is used for sending a tripping instruction to second control equipment of the distributed power supply connected with the transformer substation if the transformer substation fails, so as to instruct the second control equipment to control the distributed power supply to perform tripping operation.
9. A control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the fault isolation method of the electrical network according to any one of claims 1 to 7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the fault isolation method of the electrical network according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311870824.XA CN117913757A (en) | 2023-12-29 | 2023-12-29 | Fault isolation method, device, control equipment and storage medium for power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311870824.XA CN117913757A (en) | 2023-12-29 | 2023-12-29 | Fault isolation method, device, control equipment and storage medium for power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117913757A true CN117913757A (en) | 2024-04-19 |
Family
ID=90696874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311870824.XA Pending CN117913757A (en) | 2023-12-29 | 2023-12-29 | Fault isolation method, device, control equipment and storage medium for power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117913757A (en) |
-
2023
- 2023-12-29 CN CN202311870824.XA patent/CN117913757A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2018227610B2 (en) | Extending black-start availability using energy storage systems | |
| CN105978045B (en) | The redundant control device and method of high-voltage direct current | |
| US11477213B2 (en) | Technologies for providing secure emergency power control of high voltage direct current transmission system | |
| CN105291875A (en) | Electromobile quick charge method | |
| CN104991628B (en) | Intelligent power monitoring system and monitoring method for data center | |
| CN113422356B (en) | Active power distribution network disconnection fault protection method and device and power distribution terminal | |
| CN113572193B (en) | Distributed power island operation state identification method, fusion terminal and system | |
| CN109490675B (en) | Early warning method, electronic device and test system | |
| US11309699B2 (en) | Control system for and method of fault location, isolation and supply restoration | |
| CN112421621B (en) | Integrated intelligent distribution network operation monitoring cloud system based on 5G Internet of things | |
| CN117913757A (en) | Fault isolation method, device, control equipment and storage medium for power grid | |
| CN109638795B (en) | Emergency stop control method and device for string type photovoltaic inverter system | |
| CN111596148B (en) | Test method, device and equipment for starting diesel engine in case of power failure of emergency bus of nuclear power station | |
| CN113866541A (en) | Overvoltage protection test method, device and equipment for power module of direct current converter valve | |
| CN110994570A (en) | Power distribution network protection method and system, protection equipment and storage medium | |
| CN210898519U (en) | Three-phase power supply and distribution system access total power error reporting circuit and three-phase power supply and distribution system | |
| CN118137432A (en) | Fault disconnection method and device for transformer substation, electronic equipment and storage medium | |
| CN210957762U (en) | Three-phase power supply and distribution system access total power error alarm circuit and three-phase power supply and distribution system | |
| CN110571808B (en) | Remote spare power automatic switching line association setting verification method and spare power automatic switching device | |
| CN111276931B (en) | New energy peripheral alternating current line protection fixed value checking method, system and equipment | |
| CN114709853B (en) | Power supply system and method | |
| CN211859724U (en) | Nuclear power station auxiliary power system | |
| CN113809828B (en) | Control method and device for grounding disconnecting link | |
| CN203397346U (en) | Marine SD (Secure Digital) card data storage unit | |
| CN114039422A (en) | Power supply network monitoring method and device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |