CN115764837B - Fault line selection analysis method and device based on subnet segmentation - Google Patents
Fault line selection analysis method and device based on subnet segmentation Download PDFInfo
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Abstract
The invention discloses a fault line selection analysis method and device based on subnet division, which are used for determining the configuration scheme of a three-phase isolation transformer by dividing a power distribution network into a plurality of subnets, so that a worker can realize fault current suppression of the power distribution network with minimum cost, and after the three-phase isolation transformer is configured, ground fault analysis is carried out, the three-phase isolation transformer can work normally for subnets which do not have faults, and fault residual current can be effectively suppressed for subnets which have faults, so that the purpose of fault current suppression is realized.
Description
Technical Field
The invention relates to the field of distribution network fault identification, in particular to a fault line selection analysis method and device based on subnet segmentation.
Background
Some 10kV distribution lines or branch lines in certain areas pass through grassland forests to supply power to distant resident settlement points, often have extremely small distribution capacity, between tens of kilowatts and hundreds of kilowatts, and meanwhile, the equipment has poor intrinsic safety level, extremely difficult operation and maintenance and extremely high risk of initiating mountain fires after faults occur. The emergency shutdown and risk avoidance of the lines under severe weather conditions is an effective mountain fire prevention measure adopted in recent years, but obviously causes the deterioration of the power supply reliability of the areas, and the complaint rate of relevant unit customers is high.
To remedy this contradiction, studies have been made on the use of small distributed photovoltaics to supply these decentralized loads, but on the one hand a large investment is required, each supply point being calculated as 30kW, more than 20 ten thousand yuan; on the other hand, the capability of the electronic equipment for tolerating high and cold high altitudes is not fully verified, and the emergency treatment after daily operation and faults of photovoltaic and energy storage equipment in remote areas is not at all from talking. More critical is the fact that these areas have already built medium voltage distribution systems, the change to distributed photovoltaic power supply means a great investment waste.
Therefore, the power distribution mode and the flexible adjustment of the network structure can meet the requirement of power supply reliability by utilizing the existing power grid resources, and the risk of mountain fire caused by faults of the power distribution mode can be reduced as much as possible, so that the power distribution mode and the flexible adjustment of the network structure are important practical research of a machine. After the single-phase earth fault is analyzed by adopting the zero sequence network of the composite sequence network on the single-phase earth fault, the fault current flowing through the fault point can be found to be the sum of the zero sequence currents of all non-fault elements of the system. Therefore, the current of the general fault point is larger, if the fault point is not compensated by the arc suppression coil, the larger fault current easily causes frequent arc starting and arc extinguishing, and larger energy is accumulated due to the temperature rise effect in a short time, so that the fault point easily generates larger harm to peripheral forest areas and vegetation with good flammable conditions such as inflammability, and further causes uncontrollable secondary disasters. To cope with this objective, it is important to effectively reduce the fault residual current.
Disclosure of Invention
The purpose of the application is to provide a fault line selection analysis method based on subnet segmentation, which solves the problems existing in the prior art.
The invention is realized by the following technical scheme:
in a first aspect, the present application provides a method for analyzing fault line selection based on subnet splitting, including:
acquiring a wiring group of a main transformer at a transformer station side and a wiring group of a transformer at a load side transformer station, wherein the main transformer is connected to different transformer stations through a plurality of feeder lines;
determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area;
acquiring capacitance currents on all feeder lines, and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein each subnetwork comprises at least one feeder line;
configuring a corresponding three-phase isolation transformer for each sub-network according to the wiring groups of the three-phase isolation transformers;
and carrying out fault analysis on each sub-network, determining the sub-network with the fault, and completing fault line selection analysis.
In one possible embodiment, obtaining a wiring group of a main transformer on a substation side and a wiring group of a transformer on a load side area includes:
the method comprises the steps of obtaining a first wiring group or a second wiring group of a main transformer at a transformer substation side, wherein the first wiring group represents that a primary winding of the main transformer is Yn-shaped wiring and a secondary winding of the main transformer is Y-shaped wiring; the second wiring groups respectively represent that the primary winding of the main transformer is Yn-shaped wiring and the secondary winding is delta-shaped wiring;
the method comprises the steps that a wiring group of a transformer in a load side transformer area is obtained and is a third wiring group or a fourth wiring group, wherein the third wiring group represents that a primary winding of the transformer in the transformer area is Y-shaped wiring and a secondary winding of the transformer in the transformer area is Yn-shaped wiring; the fourth wiring group indicates that the primary winding of the transformer in the transformer area is delta-shaped wiring and the secondary winding is Yn wiring.
In one possible embodiment, determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area includes:
when the secondary winding of the main transformer is Y-shaped wiring and the primary winding of the transformer in the transformer area is Y-shaped wiring, determining that the primary winding of the three-phase isolation transformer is Y-shaped wiring and the secondary winding is Y-shaped wiring;
when the secondary winding of the main transformer is Y-shaped wiring and the primary winding of the transformer in the transformer area is delta-shaped wiring, determining that the primary winding of the three-phase isolation transformer is Y-shaped wiring and the secondary winding is delta-shaped wiring;
when the secondary winding of the main transformer is delta-shaped wiring and the primary winding of the transformer in the transformer area is Y-shaped wiring, determining that the primary winding of the three-phase isolation transformer is delta-shaped wiring and the secondary winding is Y-shaped wiring;
when the secondary winding of the main transformer is delta-shaped wiring and the primary winding of the transformer in the transformer area is delta-shaped wiring, the primary winding of the three-phase isolation transformer is delta-shaped wiring and the secondary winding is delta-shaped wiring.
In one possible implementation, obtaining the capacitive current on each feeder includes:
wherein,representing the total length of the feeder corresponding to the cabling, < >>Capacitive current corresponding to the cabling representing the feeder, < >>Capacitive current corresponding to the overhead line representing the feeder, < >>Representing the total length of the feeder corresponding to the overhead line, I C Representing the total capacitive current corresponding to the feed line.
In one possible implementation manner, obtaining capacitance currents on each feeder line, and dividing the sub-network based on the capacitance currents to obtain a plurality of sub-networks, including:
according to the capacitance current on each feeder line, constructing a subnet segmentation optimization model as follows:
wherein L_T ISO Representing the total number of sub-networks, i.e. three-phase isolation changesTotal number of presses, C sum (L_T ISO ) Representing the total cost of providing a three-phase isolation transformer,respectively representing the sum of the capacitance currents of at least one feeder line in N sub-networks,/or%>A threshold value representing a capacitive current;
and traversing all the subnet segmentation schemes based on the subnet segmentation optimization model, and determining a final subnet segmentation scheme to obtain a plurality of subnets.
In one possible implementation, according to the wiring group of the three-phase isolation transformers, a corresponding three-phase isolation transformer is configured for each subnet, including:
according to the wiring group of the three-phase isolation transformer, determining that the primary winding of the three-phase isolation transformer is connected with the secondary winding of the main transformer, and determining that the secondary winding of the three-phase isolation transformer is connected with the primary winding of the transformer area; the three-phase isolation transformer is connected with the transformer in the transformer area through a feeder line.
In one possible implementation, performing fault analysis on each subnet includes: and constructing a ground fault identification criterion, and judging the ground fault based on the ground fault identification criterion.
In one possible implementation, the ground fault identification criteria include:
wherein U is A Representing the effective value of the phase voltage of the power distribution network, u' 00 Representing initial asymmetry of voltage under normal operation condition of power distribution network system, d 0 Represents the damping rate in the absence of failure of the system, d g Represents the system damping rate associated with the system capacitive reactance by the transition resistance after the fault occurs, j represents the imaginary operator of the complex number,representing the zero sequence voltage phasor of the system before the fault occurs,/->Representing zero sequence voltage phasors after failure, +.>Representing zero sequence voltage abrupt phasors before and after failure, < ->Representing the magnitude of the abrupt zero sequence voltage phasors.
In one possible implementation manner, the ground fault discrimination based on the ground fault identification criterion includes:
judgingWhether the set first threshold value is exceeded or +.>And if the set second threshold value is exceeded, judging that the ground fault exists, otherwise, judging that the ground fault does not exist.
In a second aspect, an embodiment of the present application provides a subnet segmentation-based fault line selection analysis device, including an acquisition module, a determination module, a segmentation module, a configuration module, and a suppression module;
the acquisition module is used for acquiring the wiring group of the main transformer at the side of the transformer substation and the wiring group of the transformer at the side of the load, and the main transformer is connected to different transformer at the side of the transformer substation through a plurality of feeder lines;
the determining module is used for determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area;
the dividing module is used for obtaining capacitance currents on all feeder lines and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein each subnetwork comprises at least one feeder line;
the configuration module is used for configuring the corresponding three-phase isolation transformer for each sub-network according to the wiring group of the three-phase isolation transformer, and completing the suppression of fault current.
And the suppression module is used for carrying out fault analysis on each subnet, determining the subnets with faults and completing fault line selection analysis.
According to the fault line selection analysis method and device based on the subnet division, the distribution network is divided into the subnets, so that the configuration scheme of the three-phase isolation transformer is determined, a worker can realize fault current suppression of the distribution network with minimum cost, after the three-phase isolation transformer is configured, line selection analysis of a ground fault is carried out, the three-phase isolation transformer can work normally for subnets which do not have faults, and fault residual current can be effectively suppressed for subnets which do have faults, so that the purpose of fault current suppression is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a flowchart of a fault line selection analysis method based on subnet division according to an embodiment of the present application.
Fig. 2 is an equivalent block diagram of a power distribution network based on three-phase transformer isolation according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a fault line selection analysis device based on subnet division according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a fault line selection analysis device based on subnet division according to an embodiment of the present application.
In the drawings, the reference numerals and corresponding part names:
the system comprises a 21-acquisition module, a 22-determination module, a 23-segmentation module, a 24-configuration module, a 25-suppression module, a 31-memory, a 32-processor and a 33-bus.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, the present application provides a fault line selection analysis method based on subnet division, including:
s11, acquiring a wiring group of a main transformer at the side of a transformer substation and a wiring group of a transformer at a load side of a transformer station, wherein the main transformer is connected to different transformer stations through a plurality of 10kV feeder lines.
And S12, determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area.
By adopting a three-phase isolation transformer which is isolated at the same voltage level, namely 10kV/10kV, but the zero sequence loop is not communicated on the 10kV feed line of the power distribution network.
S13, acquiring capacitance currents on each 10kV feeder line, and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein each subnetwork comprises at least one 10kV feeder line.
S14, configuring corresponding three-phase isolation transformers for each sub-network according to the wiring groups of the three-phase isolation transformers, so that workers can install the three-phase isolation transformers for the sub-networks after division.
And S15, after the installation of the three-phase isolation transformer is completed by a worker, carrying out fault analysis on each sub-network, determining the sub-network with the fault, completing fault line selection analysis, and inhibiting fault current corresponding to the sub-network with the fault through the three-phase isolation transformer.
The invention provides a fault line selection analysis method based on subnet segmentation, which is based on a general scheme of a three-phase isolation transformer with zero sequence blocking, considers an optimal subnet segmentation technical scheme with a fault current inhibition effect, constructs a high-sensitivity ground fault identification criterion based on zero sequence voltage mutation, relies on progressive subnet segmentation and line selection new criteria before and after the subnet segmentation and line selection, simultaneously displays the fault characteristics under the ground fault on the basis of reducing residual current flowing through a fault point under a single-phase ground fault, constructs novel starting and line selection technology under the ground line selection background according to the residual current, enhances the technical problem of traditional 'old and difficult' of high-resistance ground faults under the single-phase ground fault, improves the line selection technology by a higher level, promotes the ground fault identification technical development of a power distribution network, and simultaneously effectively and effectively solves the practical problem of very focused production line.
In one possible embodiment, the wiring group of the three-phase isolation transformer may be obtained by:
A. and acquiring a wiring group of a main transformer of the transformer substation corresponding to the 10kV feeder line hung on the same transformer substation, and judging whether the primary winding is Yn and the secondary winding is Y-shaped or whether the primary winding is Yn and the secondary winding is delta-shaped.
B. And (3) for each 10kV feeder, acquiring the wiring group of the transformer at the load side of the feeder, and judging whether the primary winding is Y and the secondary winding is Yn or the primary winding is delta and the secondary winding is Yn.
C. According to the homotypic relation between the wiring group of the main transformer of the transformer station and the wiring group of the feeder load side, the wiring group of the three-phase isolation transformer is selected, namely: i) When the secondary winding of the main transformer of the transformer substation is Y and the primary winding of the load side transformer is Y, selecting the primary and secondary winding wiring groups of the three-phase isolation transformer to be Y, Y respectively; ii) when the secondary winding of the main transformer of the transformer substation is Y and the primary winding of the load side transformer is delta, selecting the wiring groups of the primary and secondary windings of the three-phase isolation transformer to be Y and delta respectively; iii) When the secondary winding of the main transformer of the transformer substation is delta and the primary winding of the load side transformer is Y, selecting the wiring groups of the primary and secondary windings of the three-phase isolation transformer to be delta and Y respectively; and iv) when the secondary winding of the main transformer of the transformer station is delta and the primary winding of the load side transformer is delta, selecting the wiring groups of the primary and secondary windings of the three-phase isolation transformer to be delta and delta respectively.
In one possible implementation, obtaining the capacitive current on each 10kV feed line includes:
wherein,representing the total length of the feeder corresponding to the cabling, < >>Capacitive current corresponding to the cabling representing the feeder, < >>Capacitive current corresponding to the overhead line representing the feeder, < >>Representing the total length of the feeder line corresponding to the overhead line in kilometers, I C Representing the total capacitive current corresponding to the feed line.
In one possible implementation manner, obtaining capacitance currents on each 10kV feeder, and performing subnet division based on the capacitance currents to obtain a plurality of subnets, including:
and setting a subnet division target according to the operation requirement of the distribution network or the fault current suppression effect. Combining with the operation requirement of an actual distribution network, particularly a line in a remote area in a city of three states of Sichuan, setting a sub-network splitting mode, wherein the set of sub-feeder lines after splitting is not more than 3A, and the condition is relatively easy to achieve, because the line in the city of three states is mainly an overhead line, each feeder line is not more than 50km generally, and the cable length is also concentrated at the outlet of a transformer substation generally; secondly, a sub-feeder network that is completely separated into the sum of the number of individual sub-feeders is also possible, but the corresponding costs are relatively high. Therefore, according to the capacitance current on each 10kV feed line, a subnet segmentation optimization model is constructed as follows:
wherein L_T ISO Representing the total number of sub-networks, i.e. the total number of three-phase isolation transformers, C sum (L_T ISO ) Representing the total cost of providing a three-phase isolation transformer,respectively representing the sum of the capacitance currents of at least one 10kV feeder line in N subnetworks, +.>Representing the threshold value of the capacitive current.
Based on the subnet segmentation optimization model, traversing all subnet segmentation schemes, and determining a final subnet segmentation scheme to obtain a plurality of subnets.
In one possible implementation, according to the wiring group of the three-phase isolation transformers, a corresponding three-phase isolation transformer is configured for each subnet, including:
according to the wiring group of the three-phase isolation transformer, the primary winding of the three-phase isolation transformer is determined to be connected with the secondary winding of the main transformer, and the secondary winding of the three-phase isolation transformer is determined to be connected with the primary winding of the transformer area transformer. The three-phase isolation transformer is connected with the transformer in the transformer area through a 10kV feeder line.
As shown in fig. 2, which is an equivalent block diagram of a power distribution network based on three-phase transformer isolation, the function of suppressing fault current is realized by arranging a three-phase isolation transformer.
In one possible implementation, performing fault analysis on each subnet includes: and constructing a ground fault identification criterion, and judging the ground fault based on the ground fault identification criterion.
In one possible implementation, the ground fault identification criteria include:
wherein U is A Representing the effective value of the phase voltage of the power distribution network, u' 00 Representing initial asymmetry of voltage under normal operation condition of power distribution network system, d 0 Represents the damping rate in the absence of failure of the system, d g Represents the system damping rate associated with the system capacitive reactance by the transition resistance after the fault occurs, j represents the imaginary operator of the complex number,representing the zero sequence voltage phasor of the system before the fault occurs,/->Representing zero sequence voltage phasors after failure, +.>Representing zero sequence voltage abrupt phasors before and after failure, < ->Representing the magnitude of the abrupt zero sequence voltage phasors.
In one possible implementation, the ground fault discrimination based on the ground fault identification criteria includes:
judgingWhether the set first threshold value is exceeded or +.>And if the set second threshold value is exceeded, judging that the ground fault exists, otherwise, judging that the ground fault does not exist.
Simulation was performed before and after the subnet division, and three-phase voltage and three-phase current on the load side were measured, resulting in the results shown in table 1.
TABLE 1 three-phase voltage, three-phase current Electrical quantity before and after subnet splitting mode
It can be seen from table 1 that the subnet splitting mode does not change the power supply reliability requirement of the original load, i.e., the three-phase voltage and the three-phase current are the same as those before the subnet splitting mode is not adopted.
In addition, the invention also carries out the ground fault experiment under different fault resistances for the performance quality of the extracted line selection criteria, and the experimental results are shown in table 2.
TABLE 2 sensitivity performance effects of the criteria presented in single phase ground fault experiments at different transition resistances
From table 2, it can be seen that: compared with the sub-network segmentation mode, the sub-network segmentation mode based on the three-phase transformer isolated zero-sequence network can effectively display fault characteristics, zero-sequence voltage mutation quantity is basically and averagely improved to about three times, and as the transition resistance is higher, the rule is kept unchanged, the high-transition resistance grounding fault with the same difficulty is obviously maintained, and the sub-network segmentation mode and the accompanying grounding fault line selection criterion can be applied to better line selection capability and better meet the requirements of practical engineering application.
Example 2
As shown in fig. 3, an embodiment of the present application provides a fault line selection analysis device based on subnet division, which includes an acquisition module 21, a determination module 22, a division module 23, a configuration module 24, and a suppression module 25.
The acquisition module 21 is configured to acquire a wiring group of a main transformer on the transformer station side and a wiring group of a transformer on the load side, where the main transformer is connected to different transformer stations through a plurality of 10kV feeders.
The determining module 22 is configured to determine the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area.
The dividing module 23 is configured to obtain capacitive currents on each 10kV feeder, and perform subnet division based on the capacitive currents to obtain multiple subnets, where each subnet includes at least one 10kV feeder.
The configuration module 24 is configured to configure a corresponding three-phase isolation transformer for each sub-network according to the wiring group of the three-phase isolation transformers, so as to complete suppression of fault current.
The suppression module 25 is configured to perform fault analysis on each sub-network, determine a sub-network with a fault, and suppress, by using a three-phase isolation transformer, a fault current corresponding to the sub-network with the fault.
The method technical scheme described in embodiment 1 can be executed by the fault line selection analysis device based on subnet division, and the beneficial effects and principles are similar and will not be repeated here.
Example 3
As shown in fig. 4, the present embodiment provides a fault line selection analysis device based on subnet division, which includes a memory 31 and a processor 32, and the memory 31 and the processor 32 are connected to each other through a bus 33.
The memory 31 stores computer-executable instructions.
Processor 32 executes computer-executable instructions stored in memory to cause the processor to perform a subnet segmentation based fault line selection analysis method as described in embodiment 1.
By way of specific example, the Memory may include, but is not limited to, random access Memory (random access Memory, RAM), read Only Memory (ROM), flash Memory (Flash Memory), first-in-first-out Memory (First Input First Output, FIFO) and/or first-in-last-out Memory (First In Last Out, FILO), and the like; in particular, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, or the like. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ), and may also include a main processor and a coprocessor, where the main processor is a processor for processing data in an awake state, and is also called CPU (Central Processing Unit ); a coprocessor is a low-power processor for processing data in a standby state.
In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit, image processor) for taking charge of rendering and rendering of content required to be displayed by the display screen, for example, the processor may not be limited to a microprocessor employing a model number of STM32F105 family, a reduced instruction set computer (reduced instruction set computer, RISC) microprocessor, an X86 or other architecture processor, or a processor integrating an embedded neural network processor (neural-network processing units, NPU); the transceiver may be, but is not limited to, a wireless fidelity (WIFI) wireless transceiver, a bluetooth wireless transceiver, a general packet radio service technology (General Packet Radio Service, GPRS) wireless transceiver, a ZigBee protocol (low power local area network protocol based on the ieee802.15.4 standard), a 3G transceiver, a 4G transceiver, and/or a 5G transceiver, etc. In addition, the device may include, but is not limited to, a power module, a display screen, and other necessary components.
Example 4
The present embodiment provides a computer-readable storage medium in which computer-executable instructions are stored, which when executed by a processor, are configured to implement a method for analyzing a fault line selection based on subnet splitting as described in embodiment 1.
Example 5
Embodiments of the present application may also provide a computer program product, including a computer program, which when executed by a processor implements a method for analyzing fault line selection based on subnet splitting as described in embodiment 1.
According to the fault line selection analysis method and device based on the subnet division, the distribution network is divided into the subnets, so that the configuration scheme of the three-phase isolation transformer is determined, a worker can realize fault current suppression of the distribution network with minimum cost, after the three-phase isolation transformer is configured, analysis of a ground fault is carried out, the three-phase isolation transformer can work normally for subnets which do not have faults, and fault residual current can be effectively suppressed for subnets which do have faults, so that the purpose of fault current suppression is achieved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The fault line selection analysis method based on the subnet division is characterized by comprising the following steps of:
acquiring a wiring group of a main transformer at a transformer station side and a wiring group of a transformer at a load side transformer station, wherein the main transformer is connected to different transformer stations through a plurality of feeder lines;
determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area;
acquiring capacitance currents on all feeder lines, and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein each subnetwork comprises at least one feeder line;
configuring a corresponding three-phase isolation transformer for each sub-network according to the wiring groups of the three-phase isolation transformers;
performing fault analysis on each sub-network, determining the sub-network with the fault, and completing fault line selection analysis;
obtaining a wiring group of a main transformer at a transformer station side and a wiring group of a transformer at a load side transformer area, comprising:
the method comprises the steps of obtaining a first wiring group or a second wiring group of a main transformer at a transformer substation side, wherein the first wiring group represents that a primary winding of the main transformer is Yn-shaped wiring and a secondary winding of the main transformer is Y-shaped wiring; the second wiring groups respectively represent that the primary winding of the main transformer is Yn-shaped wiring and the secondary winding is delta-shaped wiring;
the method comprises the steps that a wiring group of a transformer in a load side transformer area is obtained and is a third wiring group or a fourth wiring group, wherein the third wiring group represents that a primary winding of the transformer in the transformer area is Y-shaped wiring and a secondary winding of the transformer in the transformer area is Yn-shaped wiring; the fourth wiring group indicates that the primary winding of the transformer in the transformer area is delta-shaped wiring and the secondary winding is Yn wiring;
determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area, comprising:
when the secondary winding of the main transformer is Y-shaped wiring and the primary winding of the transformer in the transformer area is Y-shaped wiring, determining that the primary winding of the three-phase isolation transformer is Y-shaped wiring and the secondary winding is Y-shaped wiring;
when the secondary winding of the main transformer is Y-shaped wiring and the primary winding of the transformer in the transformer area is delta-shaped wiring, determining that the primary winding of the three-phase isolation transformer is Y-shaped wiring and the secondary winding is delta-shaped wiring;
when the secondary winding of the main transformer is delta-shaped wiring and the primary winding of the transformer in the transformer area is Y-shaped wiring, determining that the primary winding of the three-phase isolation transformer is delta-shaped wiring and the secondary winding is Y-shaped wiring;
when the secondary winding of the main transformer is delta-shaped wiring and the primary winding of the transformer in the transformer area is delta-shaped wiring, determining that the primary winding of the three-phase isolation transformer is delta-shaped wiring and the secondary winding is delta-shaped wiring;
acquiring capacitance currents on each feeder line, including:
wherein,representing the total length of the feeder corresponding to the cabling, < >>Capacitive current corresponding to the cabling representing the feeder, < >>Capacitive current corresponding to the overhead line representing the feeder, < >>Representing the total length of the feeder corresponding to the overhead line, I C Representing the total capacitance current corresponding to the feeder line;
acquiring capacitance currents on each feeder line, and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein the method comprises the following steps:
according to the capacitance current on each feeder line, constructing a subnet segmentation optimization model as follows:
wherein L_T ISO Representing the total number of sub-networks, i.e. the total number of three-phase isolation transformers, C sum (L_T ISO ) Representing the total cost of providing a three-phase isolation transformer,respectively representing the sum of the capacitance currents of at least one feeder line in N sub-networks,/or%>A threshold value representing a capacitive current;
traversing all the subnet segmentation schemes based on the subnet segmentation optimization model, and determining a final subnet segmentation scheme to obtain a plurality of subnets;
performing fault analysis on each subnet, including: constructing a ground fault identification criterion, and judging the ground fault based on the ground fault identification criterion;
the ground fault identification criteria include:
wherein U is A Representing the effective value of the phase voltage of the power distribution network, u' 00 Representing initial asymmetry of voltage under normal operation condition of power distribution network system, d 0 Represents the damping rate in the absence of failure of the system, d g Represents the system damping rate associated with the system capacitive reactance by the transition resistance after the fault occurs, j represents the imaginary operator of the complex number,representing the zero sequence voltage phasor of the system before the fault occurs,/->Representing zero sequence voltage phasors after failure, +.>Representing zero sequence voltage abrupt phasors before and after failure, < ->Representing the amplitude of the abrupt zero sequence voltage phasors;
and carrying out ground fault discrimination based on the ground fault identification criterion, wherein the method comprises the following steps:
judgingWhether or not to exceed a set first thresholdValue or +.>And judging whether the set second threshold value is exceeded, if so, judging that the ground fault exists, otherwise, judging that the ground fault does not exist.
2. The subnet division-based fault line selection analysis method according to claim 1, wherein configuring a corresponding three-phase isolation transformer for each subnet according to a wiring group of the three-phase isolation transformers comprises:
according to the wiring group of the three-phase isolation transformer, determining that the primary winding of the three-phase isolation transformer is connected with the secondary winding of the main transformer, and determining that the secondary winding of the three-phase isolation transformer is connected with the primary winding of the transformer area; the three-phase isolation transformer is connected with the transformer in the transformer area through a feeder line.
3. A subnet division-based fault line selection analysis device for executing the subnet division-based fault line selection analysis method according to claim 1 or 2, characterized by comprising an acquisition module, a determination module, a division module, a configuration module and a suppression module;
the acquisition module is used for acquiring the wiring group of the main transformer at the side of the transformer substation and the wiring group of the transformer at the side of the load, and the main transformer is connected to different transformer at the side of the transformer substation through a plurality of feeder lines;
the determining module is used for determining the wiring group of the three-phase isolation transformer based on the wiring group of the main transformer and the wiring group of the transformer in the transformer area;
the dividing module is used for obtaining capacitance currents on all feeder lines and dividing the subnetworks based on the capacitance currents to obtain a plurality of subnetworks, wherein each subnetwork comprises at least one feeder line;
the configuration module is used for configuring the corresponding three-phase isolation transformer for each subnet according to the wiring group of the three-phase isolation transformer to complete the suppression of fault current;
and the suppression module is used for carrying out fault analysis on each subnet, determining the subnets with faults and completing fault line selection analysis.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598761A (en) * | 2009-07-29 | 2009-12-09 | 江苏省电力公司常州供电公司 | Fault line selection method for small electric current grounding system of distribution network |
| CN103197202A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Distribution network fault line selection method based on wavelet coefficient correlation analysis in three-phase breaking current component characteristic frequency band |
| CN103197203A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Fault line selection method based on time domain waveform correlation analysis of three-phase current breaking variable |
| WO2014154164A1 (en) * | 2013-03-29 | 2014-10-02 | 北京映翰通网络技术股份有限公司 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| WO2015139587A1 (en) * | 2014-03-16 | 2015-09-24 | 田京涛 | Method for detecting ground fault of distribution network area and system for positioning ground fault area of distribution network |
| CN107658860A (en) * | 2017-09-01 | 2018-02-02 | 南方电网科学研究院有限责任公司 | Power distribution network system fault suppression method and device, computer storage medium and equipment |
| CN107991579A (en) * | 2017-11-27 | 2018-05-04 | 国网山东省电力公司聊城供电公司 | A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system |
| CN110221178A (en) * | 2019-06-28 | 2019-09-10 | 国网四川省电力公司电力科学研究院 | The fault wire selection method and device of single-phase grounded malfunction in grounded system of low current |
| CN112736887A (en) * | 2020-12-25 | 2021-04-30 | 福州大学 | Power distribution network ground fault integrated arc extinction method based on power electronic transformer |
| CN112731054A (en) * | 2020-12-19 | 2021-04-30 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault line selection method based on zero sequence residual voltage suppression |
| CN114336542A (en) * | 2021-12-01 | 2022-04-12 | 中国能源建设集团江苏省电力设计院有限公司 | Generator for accurate partitioning of thermal power plant and auxiliary power grounding protection method |
| WO2022099795A1 (en) * | 2020-11-16 | 2022-05-19 | 贵州电网有限责任公司 | Detection method for detecting small-current single-phase ground fault in 10 kv distribution network |
-
2022
- 2022-10-21 CN CN202211293586.6A patent/CN115764837B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598761A (en) * | 2009-07-29 | 2009-12-09 | 江苏省电力公司常州供电公司 | Fault line selection method for small electric current grounding system of distribution network |
| CN103197202A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Distribution network fault line selection method based on wavelet coefficient correlation analysis in three-phase breaking current component characteristic frequency band |
| CN103197203A (en) * | 2013-03-29 | 2013-07-10 | 昆明理工大学 | Fault line selection method based on time domain waveform correlation analysis of three-phase current breaking variable |
| WO2014154164A1 (en) * | 2013-03-29 | 2014-10-02 | 北京映翰通网络技术股份有限公司 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| WO2015139587A1 (en) * | 2014-03-16 | 2015-09-24 | 田京涛 | Method for detecting ground fault of distribution network area and system for positioning ground fault area of distribution network |
| CN107658860A (en) * | 2017-09-01 | 2018-02-02 | 南方电网科学研究院有限责任公司 | Power distribution network system fault suppression method and device, computer storage medium and equipment |
| CN107991579A (en) * | 2017-11-27 | 2018-05-04 | 国网山东省电力公司聊城供电公司 | A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system |
| CN110221178A (en) * | 2019-06-28 | 2019-09-10 | 国网四川省电力公司电力科学研究院 | The fault wire selection method and device of single-phase grounded malfunction in grounded system of low current |
| WO2022099795A1 (en) * | 2020-11-16 | 2022-05-19 | 贵州电网有限责任公司 | Detection method for detecting small-current single-phase ground fault in 10 kv distribution network |
| CN112731054A (en) * | 2020-12-19 | 2021-04-30 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault line selection method based on zero sequence residual voltage suppression |
| CN112736887A (en) * | 2020-12-25 | 2021-04-30 | 福州大学 | Power distribution network ground fault integrated arc extinction method based on power electronic transformer |
| CN114336542A (en) * | 2021-12-01 | 2022-04-12 | 中国能源建设集团江苏省电力设计院有限公司 | Generator for accurate partitioning of thermal power plant and auxiliary power grounding protection method |
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