CN115864326A - Testing method, device and system based on local feeder - Google Patents
Testing method, device and system based on local feeder Download PDFInfo
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Abstract
The invention provides a testing method, a testing device and a testing system based on a local feeder device. The testing method based on the local feeder device comprises the following steps: acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data; closing the corresponding section switch according to the voltage detection result and the overcurrent detection result; and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the closing duration time. The invention can accurately reflect the actual condition of the power distribution network fault and effectively guide the fault maintenance of the power distribution network.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a testing method, a testing device and a testing system based on a local feeder device.
Background
The power distribution network is directly related to the daily life power consumption of resident customers. When a power failure accident is caused by sudden failure, the normal production and living order can be seriously influenced. Distribution automation is an important component of an intelligent distribution network and is an important means for improving power supply reliability, improving power quality and realizing safe and reliable operation of the distribution network. As one of the important functions in the distribution automation system, feeder automation can quickly realize the positioning, isolation and recovery of a fault in a non-fault area for power supply.
Due to the complexity of feeder automation implementation, it is very difficult to test and verify the action logic in the engineering field. The power system simulation software is used for simulating the power distribution network fault moment and the switching action process after the fault, so that the fault processing function of feeder automation can be displayed, and the power supply reliability of the power distribution network is improved. However, the logic of tripping and closing in the existing test model is not comprehensive, so that the load power failure time of each node in the test process is deviated, and the instruction value for fault maintenance is not high.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a testing method, a testing device and a testing system based on an on-site feeder device, so as to accurately reflect the actual condition of the fault of a power distribution network and effectively guide the fault maintenance of the power distribution network.
And a fault area is isolated in time, power supply in a non-fault area is recovered, fault loss is reduced, and power supply reliability of the power distribution network is improved.
In order to achieve the above object, an embodiment of the present invention provides a testing method based on a local feeder apparatus, including:
acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
closing the corresponding section switch according to the voltage detection result and the overcurrent detection result;
and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the closing duration time.
In one embodiment, closing the corresponding section switch according to the voltage detection result and the overcurrent detection result includes:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding sectional switch after a second delay time.
In one embodiment, opening the corresponding section switch according to the duration of the voltage and the duration of the closing comprises:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the pressure duration time is less than the preset pressure time, the corresponding section switch is switched off.
The embodiment of the invention also provides a testing device based on the local feeder device, which comprises:
the detection module is used for acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
the opening and closing mold closing module is used for closing the corresponding section switches according to the voltage detection result and the overcurrent detection result;
and the switch disconnection module is used for acquiring the pressure duration according to the pressure detection result and disconnecting the corresponding section switch according to the pressure duration or the closing duration.
In one embodiment, the switch closing module is specifically configured to:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding section switch after a second delay time.
In one embodiment, the switch disconnect module is specifically configured to:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the pressure duration time is less than the preset pressure time, the corresponding section switch is switched off.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program stored on the memory and running on the processor, wherein the steps of the testing method based on the local feeder device are realized when the processor executes the computer program.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of the testing method based on the local feeder.
The embodiment of the present invention further provides a computer program product, which includes a computer program/instruction, and the computer program/instruction when executed by a processor implements the steps of the testing method based on the in-place feeder apparatus.
The embodiment of the invention also provides a test system based on the in-situ feeder device, which comprises:
the power distribution network is provided with a plurality of nodes; the nodes include a bus node and a first node;
the testing device based on the local feeder device is connected to a power distribution network;
a circuit breaker located between the bus bar node and the first node;
one end of the transformer is connected with the bus node, and the other end of the transformer is connected with the first external power grid; and
one end of the power distribution network is connected with the node, and the other end of the power distribution network is connected with a connection switch of a second external power grid.
According to the testing method, the testing device and the testing system based on the in-situ feeder device, voltage loss detection is carried out according to node voltage data, voltage detection is carried out according to node current data, then the corresponding section switch is closed according to a voltage detection result and an overcurrent detection result, voltage duration is obtained according to the voltage detection result, the corresponding section switch is opened according to the voltage duration or the closing duration, the actual condition of the fault of the power distribution network can be accurately reflected, and fault maintenance of the power distribution network is effectively guided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a testing method based on a local feeder in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the control logic of a power distribution terminal in an embodiment of the present invention;
fig. 3 is a schematic diagram of a per unit value of voltages of three phase lines at a fault occurrence position when an outlet single-phase earth fault is short-circuited in the embodiment of the present invention;
FIG. 4 is a schematic illustration of three phase line currents at the fault location when the outlet single phase ground fault is shorted in an embodiment of the present invention;
FIG. 5 is a block diagram of a local feeder based test according to an embodiment of the present invention;
FIG. 6 is a block diagram of a computer apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a test system based on an in-place feeder apparatus in an embodiment of the present invention;
figure 8 is a schematic diagram of the control logic for a circuit breaker in an embodiment of the present invention;
FIG. 9 is a schematic diagram of a node power loss in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the limitation of the existing test model, the embodiment of the invention provides a test method, a test device and a test system based on a local feeder device, which can accurately reflect the actual condition of the power distribution network fault through the mutual communication, protection coordination or time sequence coordination of power distribution terminals and effectively guide the fault maintenance of the power distribution network. The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flow chart of a testing method based on a local feeder in an embodiment of the present invention. As shown in fig. 1, the testing method based on the in-place feeder apparatus includes:
s101: and acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data.
The invention can be applied to power distribution terminals. The power distribution terminal has two modes of 'segmentation' and 'connection'. Under the 'subsection' mode, the power distribution terminal has the functions of voltage-loss immediate switching-off, incoming call delay switching-on and switch locking; in the 'interconnection' mode, the power distribution terminal has instantaneous pressurization blocking and load transfer functions.
In-situ power distribution terminals are typically placed in a "sectionalized" mode. Fig. 2 is a schematic diagram of the control logic of a power distribution terminal in an embodiment of the present invention. Fig. 3 is a schematic diagram of the voltage per unit value of the three-phase line at the fault occurrence position when the outgoing line single-phase ground fault is short-circuited in the embodiment of the present invention. Fig. 4 is a schematic diagram of three-phase line currents at the fault location when the outlet single-phase ground fault is shorted in an embodiment of the present invention. As shown in fig. 2-4, a voltage transformer measures the three-phase voltage at the node where the power distribution terminal is located, and a current transformer measures the three-phase current at the node where the power distribution terminal is located.
S102: and closing the corresponding section switch according to the voltage detection result and the overcurrent detection result.
In one embodiment, S102 includes:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding section switch after a second delay time.
In specific implementation, the voltage state, the overcurrent state and the voltage loss state can be determined by the following formulas:
wherein the content of the first and second substances,
is the first reliable coefficient>
Is two reliable coefficients>
Is the third reliability coefficient, n CT1 Is the transformation ratio of the high-voltage side current transformer, n CT2 Is the transformation ratio of the low-voltage side current transformer, n VT1 Is the transformation ratio of a high-voltage side voltage transformer, n VT2 Is the transformation ratio of a low-voltage side voltage transformer, I k.i.max The maximum short-circuit current of the ith node is the short-circuit current when the three-phase short circuit occurs at the ith node; u shape min,i The node voltage at the ith node in voltage loss is generally 0V; u shape res Is a voltage compensation value; u shape N,i Is the primary side rated voltage of the ith node, I is the node line current, and U is the node line voltage. Table 1 is a schematic table of the transformer parameters in the embodiment of the present invention.
TABLE 1
When in use
When the node satisfies the over-current condition, when->
When the node meets the pressure condition, when->
The time node meets the pressure loss condition. Before S102 is executed, the node meets the voltage loss condition, the voltage loss detection module judges that the node is in voltage loss at the moment, and the tripping module is started to logically control the switch to trip in a protection mode. And if the overcurrent detection module judges that the line current is the fault current at the moment, starting an overcurrent memory delay and then judging the fault line. And if the voltage detection module judges that the node has a voltage incoming call at the moment, transmitting a voltage signal to a subsequent module.
When a short-circuit fault occurs in the line, if the fault is an instantaneous fault, the outgoing line Circuit Breakers (CB) of the transformer substation are successfully superposed, the section switches adopt short time delay according to fault memory, the fault-free memory adopts a long time delay mode, closing and sending are sequentially adopted, and the line recovers power supply. If the fault line is judged, delay triggering is carried out after a time limit of a pressure signal X is set; if the circuit is judged to be a non-fault circuit, a long-time delay back delay trigger of the voltage signal is set.
As shown in fig. 2, if the value of the voltage signal transmitted to the fault line determination module by the voltage detection module is 1 and an overcurrent memory exists (the node satisfies the voltage condition and the overcurrent condition, and the outputs of the overcurrent delay module and the voltage detection module are both 1), the line is a fault line, and the switch is controlled to be switched on after X time delay (generally 7 s). If the value of the voltage signal transmitted to the fault line judgment module by the voltage detection module is 1 and the current memory exists or not (the node meets the voltage condition and does not meet the overcurrent condition, the output of the overcurrent delay module is 0, and the output of the voltage detection module is 1), the line is a non-fault line, and the switch is controlled to be switched on after long delay (the time for confirming the voltage without the fault memory is generally 57 s). When the output signal of the X time-limit delay module connected with the fault line judging module is 1 or the output signal of the long delay module is 1 as long as the output signal of the locking memory delay module is 0, the switch-on judging module enables the switch to be switched on.
S103: and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the closing duration time.
In one embodiment, S103 includes:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the pressure duration time is less than the preset pressure time, the corresponding section switch is switched off.
During specific implementation, the power distribution terminal triggers the shutting to have two kinds of condition: as shown in fig. 2, for the section switch at the upstream of the fault point, when the Y time is not maintained after the switch is closed (the closing duration is less than the preset closing time, the output of the Y time delay module is 1, and the output of the voltage detection module is 0), the latching memory delay module keeps the latching signal at 1, so that the switch-on judging module is disabled, and then the power distribution terminal cannot control the switch to be switched on; for a downstream switch at a fault point, when an instant call is sensed (the pressure time is not kept for X time, the pressure duration is less than the preset pressure time, the output of the pressure detection module is 0, and the output of the X time-limit delay module is 1), the locking memory delay module keeps the locking signal at 1, so that the closing judgment module is disabled, and then the power distribution terminal cannot control the switch to be closed.
In one embodiment, the local power distribution terminal is placed in a "tie" mode when the power distribution terminal controls the tie switch to open. At the moment, the power distribution terminal has functions of instantaneous pressurization locking and load transfer. The logic functions of the switch trip, the fault line determination, etc. in fig. 2 are temporarily not used. The contact switch is closed due to the fact that the contact switch is closed by the fact that the contact switch is subjected to instant incoming call (the time with pressure is not kept for X time). When a short-circuit fault occurs to a line, the interconnection switch can detect voltage loss of one side, and if the voltage loss time is longer than the confirmation time (long delay, interconnection switch voltage loss confirmation time, 57 s) before the interconnection switch is switched on, the interconnection switch is automatically switched on, load transfer is carried out, and power supply of a non-fault area is recovered.
The main body of the local feeder based test method shown in fig. 1 may be a power distribution terminal. As can be seen from the process shown in fig. 1, in the testing method based on the in-situ feeder apparatus according to the embodiment of the present invention, voltage loss detection is performed according to node voltage data, voltage detection is performed according to node current data, then the corresponding section switch is closed according to the voltage detection result and the overcurrent detection result, voltage duration is obtained according to the voltage detection result, and the corresponding section switch is opened according to the voltage duration or the closing duration, so that the actual condition of the power distribution network fault can be accurately reflected, and the fault maintenance of the power distribution network can be effectively guided.
Based on the same inventive concept, the embodiment of the invention also provides a testing device based on the local feeder device, and as the principle of solving the problems of the device is similar to the testing method based on the local feeder device, the implementation of the device can refer to the implementation of the method, and repeated parts are not described again.
FIG. 5 is a block diagram of a testing apparatus based on a local feeder according to an embodiment of the present invention. As shown in fig. 5, the testing apparatus based on the in-place feeder apparatus includes:
the detection module is used for acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
the opening and closing mold closing module is used for closing the corresponding section switches according to the voltage detection result and the overcurrent detection result;
and the switch disconnection module is used for acquiring the pressure duration according to the pressure detection result and disconnecting the corresponding section switch according to the pressure duration or the closing duration.
In one embodiment, the switch closing module is specifically configured to:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding sectional switch after a second delay time.
In one embodiment, the switch disconnect module is specifically configured to:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the pressure duration time is less than the preset pressure time, the corresponding section switch is switched off.
To sum up, the testing device based on the in-situ feeder device according to the embodiment of the invention firstly performs voltage loss detection according to node voltage data and voltage detection and performs overcurrent detection according to node current data, then closes the corresponding section switch according to the voltage detection result and the overcurrent detection result, acquires the voltage duration according to the voltage detection result, and opens the corresponding section switch according to the voltage duration or the closing duration, so that the actual condition of the fault of the power distribution network can be accurately reflected, and the fault maintenance of the power distribution network can be effectively guided.
The embodiment of the invention also provides a specific implementation manner of computer equipment, which can realize all the steps in the testing method based on the local feeder device in the embodiment. Fig. 6 is a block diagram of a computer device in an embodiment of the present invention, and referring to fig. 6, the computer device specifically includes the following:
a processor (processor) 601 and a memory (memory) 602.
The processor 601 is used to call the computer program in the memory 602, and the processor executes the computer program to implement all the steps in the in-place feeder-based testing method in the above embodiments, for example, the processor executes the computer program to implement the following steps:
acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
closing the corresponding section switch according to the voltage detection result and the overcurrent detection result;
and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the closing duration time.
To sum up, the computer device of the embodiment of the invention firstly performs voltage loss detection and voltage detection according to the node voltage data and performs overcurrent detection according to the node current data, then closes the corresponding section switch according to the voltage detection result and the overcurrent detection result, acquires the voltage duration according to the voltage detection result, and opens the corresponding section switch according to the voltage duration or the closing duration, so that the actual condition of the fault of the power distribution network can be accurately reflected, and the fault maintenance of the power distribution network can be effectively guided.
An embodiment of the present invention further provides a computer-readable storage medium capable of implementing all the steps in the testing method based on the in-place feeder apparatus in the foregoing embodiments, where the computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, implements all the steps in the testing method based on the in-place feeder apparatus in the foregoing embodiments, for example, when the processor executes the computer program, implements the following steps:
acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
closing the corresponding section switch according to the voltage detection result and the overcurrent detection result;
and acquiring the duration of pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration of the pressure or the duration of the closing.
To sum up, the computer-readable storage medium according to the embodiment of the present invention performs voltage loss detection and voltage detection according to the node voltage data, performs overcurrent detection according to the node current data, then closes the corresponding section switch according to the voltage detection result and the overcurrent detection result, acquires the voltage duration according to the voltage detection result, and opens the corresponding section switch according to the voltage duration or the closing duration, so as to accurately reflect the actual situation of the fault of the power distribution network and effectively guide the fault maintenance of the power distribution network.
Embodiments of the present invention further provide a computer program product capable of implementing all steps in the testing method based on a local feeder apparatus in the foregoing embodiments, where the computer program product includes a computer program/instruction, and when the computer program/instruction is executed by a processor, the computer program/instruction implements all steps of the testing method based on a local feeder apparatus in the foregoing embodiments, for example, when the processor executes the computer program, the processor implements the following steps:
acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
closing the corresponding section switch according to the voltage detection result and the overcurrent detection result;
and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the closing duration time.
To sum up, the computer program product of the embodiment of the present invention performs voltage loss detection and voltage detection according to the node voltage data, performs overcurrent detection according to the node current data, then closes the corresponding section switch according to the voltage detection result and the overcurrent detection result, acquires the voltage duration according to the voltage detection result, and opens the corresponding section switch according to the voltage duration or the closing duration, so as to accurately reflect the actual situation of the power distribution network fault and effectively guide the fault maintenance of the power distribution network.
Based on the same inventive concept, the embodiment of the invention also provides a test system based on the local feeder device, and as the principle of solving the problems of the system is similar to the test method based on the local feeder device, the implementation of the device can refer to the implementation of the method, and repeated parts are not described again.
Fig. 7 is a schematic diagram of a test system based on a local feeder device in an embodiment of the present invention. As shown in fig. 7, the test system based on the in-place feeder apparatus includes:
a power distribution network provided with a plurality of nodes (0-39); the nodes include a busbar node 0 and a first node 1;
the testing device based on the local feeder device as described above is connected to a power distribution network (not shown in fig. 7);
a circuit breaker CB located between bus node 0 and first node 1;
a transformer 40 having one end connected to the bus node 0 and the other end connected to a first external power grid 41; and
one end is connected to the distribution network via a node, and the other end is connected to a tie switch LS of the second external grid 42.
As shown in fig. 7, the test system based on the in-place feeder apparatus further includes 42 loads (arrows in fig. 3) connected to the nodes. Table 2 is a table of the main parameters in a test system based on a local feeder arrangement. Table 3 is a schematic table of the parameters of the test system based on the in-place feeder device.
TABLE 2
| Device name | Equipment parameters and description |
| Overhead line | Ac three-phase, rated voltage: 10kV; unit impedance: 0.2567+0.1131j omega/km; allowable ampacity: 295A |
| Cable line | Ac three-phase, rated voltage: 10kV; unit impedance: 0.0814+ j0.1131j omega/km; allowable ampacity: 633A |
| Main transformer | Transformer transformation ratio: 121/10kV; capacity of the transformer: 50MW |
| Distribution transformer | Transformer transformation ratio: 10.5/0.4kV; capacity of the transformer: 0.04MW |
| Node point | Rated voltage: 10kV, the node is connected with the load, and the load power is taken as the load rated power |
| External power grid | The node type is as follows: balance node |
TABLE 3
During specific implementation, the power flow of the power distribution network can be calculated according to a Newton-Raphson method, and whether the voltage of the bus node and the current value on each line meet the safe and stable operation requirement of the power grid or not is verified.
The bus node voltage should satisfy the following conditions:
U i,min ≤U i ≤U i,max ；
wherein, U i Is the voltage value of the ith node, U i,min For voltage value lower limit of ith node, U i,max And taking the upper limit of the voltage value of the ith node.
Each line current should satisfy the following conditions:
I ij,min ≤I ij ≤I ij,max ；
in the formula I ij Is the current value on line ij between the ith node and the jth node, I ij,min Taking a lower limit for the current on line ij, I ij,max An upper limit is set for the current on line ij.
TABLE 4
Fig. 8 is a schematic diagram of the control logic of the circuit breaker in an embodiment of the present invention. Table 4 is a parameter schematic table of the main block in fig. 8. As shown in fig. 8 and table 2, in the circuit breaker operation logic of fig. 7, the current measurement module continuously receives the secondary-side three-phase current signals measured by the current transformer, and calculates the line current value at that time. If the line current exceeds the set secondary side current in the overcurrent detection module, the tripping module is started to logically control the protection tripping, and meanwhile, the reclosing logic is started to start the closing module to logically control the switch to close after the reclosing delay. It is worth mentioning that, because the circuit breaker should have a secondary reclosing function, the closing module should close and lock after the second closing, and the function is realized by the cooperation of the locking module and the locking memory delay module. When the circuit breaker trips again due to overcurrent after the closing module is closed, the locking module simultaneously receives a closing signal from the closing module and an overcurrent signal from the overcurrent detection module, the locking module outputs a locking signal at the moment, the locking memory module prolongs locking time, and the closing module stops closing after receiving the locking module.
In one embodiment, the testing device based on the in-situ feeder is applied to a power distribution terminal located between two nodes, such as may be disposed between nodes 4 and 5, between nodes 12 and 13, and between nodes 30 and 31 of a power distribution network.
In specific implementation, the circuit breaker and the power distribution terminal are arranged at proper positions based on an electromagnetic transient software simulation platform to establish a test system based on an in-situ feeder device as shown in fig. 7, and meanwhile, actual power distribution network data such as line parameters, conforming power and the like are input into the system to perform fault electromechanical transient simulation and in-situ feeder automation logic test, and fault load power-off time can be obtained according to a test result.
FIG. 9 is a schematic diagram of a node power loss in an embodiment of the invention. As shown in fig. 9, if a three-phase short-circuit fault occurs between the nodes 20 and 21, after fault location, isolation and recovery of the power distribution terminal, the location between the nodes 13 and 26 is a fault area, and the rest of the nodes continue to recover to normal power supply. Therefore, compared with the prior art without the circuit breaker and the power distribution terminal, the method and the system can accurately reflect the actual condition of the fault of the power distribution network, effectively guide the fault maintenance of the power distribution network, and improve the power supply reliability of the power distribution network.
To sum up, the test system based on the in-situ feeder device according to the embodiment of the invention firstly performs voltage loss detection according to node voltage data and voltage detection and performs overcurrent detection according to node current data, then closes the corresponding section switch according to the voltage detection result and the overcurrent detection result, acquires the voltage duration according to the voltage detection result, and opens the corresponding section switch according to the voltage duration or the closing duration, so that the actual condition of the fault of the power distribution network can be accurately reflected, and the fault maintenance of the power distribution network can be effectively guided.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and should not be used to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. 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 embodiments.
The various illustrative logical blocks, or units, or devices described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary designs, the functions described above in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can comprise, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium, and, thus, is included if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disk) and disks (disc) include compact disks, laser disks, optical disks, DVDs, floppy disks and blu-ray disks where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.
Claims (10)
1. A testing method based on a local feeder device is characterized by comprising the following steps:
acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
closing the corresponding section switch according to the voltage detection result and the overcurrent detection result;
and acquiring the duration time of the pressure according to the detection result of the pressure, and opening the corresponding section switch according to the duration time of the pressure or the duration time of the closing.
2. The in-place feeder-based testing method of claim 1, wherein closing the corresponding section switch according to the voltage detection result and the overcurrent detection result comprises:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding sectional switch after a second delay time.
3. The in-place feeder-based testing method of claim 1, wherein opening the corresponding section switch according to the stressed duration and the closed duration comprises:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the duration time of the pressure is less than the preset pressure time, the corresponding section switch is switched off.
4. A testing apparatus based on a local feeder, comprising:
the detection module is used for acquiring node voltage data and node current data, performing voltage loss detection and voltage detection according to the node voltage data, and performing overcurrent detection according to the node current data;
the opening and closing mold closing module is used for closing the corresponding section switches according to the voltage detection result and the overcurrent detection result;
and the switch disconnection module is used for acquiring the pressure duration according to the pressure detection result and disconnecting the corresponding section switch according to the pressure duration or the closing duration.
5. The in-place feeder-based testing device of claim 4, wherein the opening and closing module is specifically configured to:
when the node meets the voltage condition and the overcurrent condition, closing the corresponding section switch after first delay time;
and when the node meets the voltage condition and does not meet the overcurrent condition, closing the corresponding sectional switch after a second delay time.
6. The in-place feeder-based testing device of claim 4, wherein the switch disconnect module is specifically configured to:
when the closing duration is less than the preset closing time, the corresponding section switch is opened; or
And when the duration time of the pressure is less than the preset pressure time, the corresponding section switch is switched off.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the steps of the in-place feeder based testing method according to any of claims 1 to 3 are implemented when the computer program is executed by the processor.
8. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the in-place feeder-based testing method according to any of the claims 1 to 3.
9. A computer program product comprising computer programs/instructions, characterized in that the computer programs/instructions, when executed by a processor, implement the steps of the in-place feeder based testing method of any of claims 1 to 3.
10. A test system based on a local feeder device, comprising:
the power distribution network is provided with a plurality of nodes; the nodes include a bus node and a first node;
the in-situ feeder based test device of any one of claims 4-6, connected to the power distribution network;
a circuit breaker located between the bus bar node and the first node;
one end of the transformer is connected with the bus node, and the other end of the transformer is connected with a first external power grid; and
one end of the power distribution network is connected with the node, and the other end of the power distribution network is connected with a connection switch of a second external power grid.
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| CN202211445856.0A CN115864326A (en) | 2022-11-18 | 2022-11-18 | Testing method, device and system based on local feeder |
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| CN202211445856.0A CN115864326A (en) | 2022-11-18 | 2022-11-18 | Testing method, device and system based on local feeder |
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