CN115764837A - 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 a fault line selection analysis device based on subnet segmentation, wherein a configuration scheme of a three-phase isolation transformer is determined by segmenting a power distribution network into a plurality of subnets, so that a worker can realize fault current suppression of the power distribution network at minimum cost, and after the three-phase isolation transformer is configured, ground fault analysis is carried out, the three-phase isolation transformer can normally work for subnets without faults, and the three-phase isolation transformer can effectively suppress fault residual current for subnets with faults, so that the aim of suppressing the fault current is fulfilled.
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
A large number of low-density population areas exist in Sanzhou-one cities such as Sichuan sweet, ara, liang, panzhihua and the like, the coverage rate of forest and grassland is high, and the environmental meteorological conditions are severe. Partial 10kV distribution lines or branch lines in the areas penetrate through grassland forests to supply power to remote residential points, the distribution capacity is usually extremely small and ranges from dozens of kilowatts to hundreds of kilowatts, meanwhile, the intrinsic safety level of equipment is poor, the operation and maintenance are extremely difficult, and the risk of mountain fire caused by faults is extremely high. The emergency shutdown risk avoidance of the lines under severe meteorological 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 related units is high.
In order to close this conflict, companies have studied to supply power to these distributed loads using small distributed photovoltaics, but on the one hand, a large amount of investment is required, each power supply point is calculated at 30kW, and more than 20 ten thousand yuan investment is required; on the other hand, the capability of electronic equipment to resist high cold and high altitude is not fully verified, and daily operation and emergency treatment after failure of photovoltaic and energy storage equipment in remote areas are not mentioned at all. It is known that, in 2014, 3 thousands of photovoltaic systems for multiple users are installed in the *** region, and large-scale replacement is required in 2019. More critically, these regions have in fact constructed medium voltage distribution systems, with the change to distributed photovoltaic power supply representing a significant investment waste.
Therefore, the existing power grid resources are utilized, the power supply reliability requirement can be met through the flexible adjustment of the power distribution mode and the network structure, the risk of mountain fire caused by faults of the power grid resources can be reduced as far as possible, and the method is a research of important practical significance of machines and tools. After the single-phase earth fault is analyzed by adopting the composite sequence network to the zero sequence network of 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 a general fault point is larger, if the current is not compensated by an 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 peripheral forest zones and vegetation with good combustible conditions such as flammability and the like are easily damaged greatly, and further uncontrollable secondary disasters are caused. In response to this goal, effective reduction of fault residual flow is an important point.
Disclosure of Invention
The application aims to provide a fault line selection analysis method based on subnet segmentation, and the problems in the prior art are solved.
The invention is realized by the following technical scheme:
in a first aspect, the present application provides a method for analyzing fault route selection based on subnet segmentation, including:
the method comprises the steps that a wiring group of a main transformer on a transformer substation side and a wiring group of a transformer on a load side station area are obtained, and the main transformer is connected to different station area transformers through a plurality of feeders;
determining a 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 current on each feeder line, and performing subnet segmentation based on the capacitance current to obtain a plurality of subnets, wherein each subnet comprises at least one feeder line;
configuring a corresponding three-phase isolation transformer for each sub-network according to the wiring group of the three-phase isolation transformer;
and carrying out fault analysis on each subnet, determining the subnet with the fault, and completing fault line selection analysis.
In one possible embodiment, acquiring a terminal group of a substation-side main transformer and a terminal group of a load-side platform-area transformer includes:
the method comprises the steps that a connection group of a main transformer on a transformer station side is obtained to be a first connection group or a second connection group, wherein the first connection group represents that a primary winding of the main transformer is Yn-shaped connection and a secondary winding of the main transformer is Y-shaped connection; the second wiring group represents that a primary winding of the main transformer is Yn-shaped wiring and a secondary winding of the main transformer is delta-shaped wiring;
the method comprises the steps that a connection group of a load side transformer in a transformer area is obtained to be a third connection group or a fourth connection group, wherein the third connection group indicates that a primary winding of the transformer area is in Y-shaped connection and a secondary winding of the transformer area is in Yn-shaped connection; and the fourth wiring group represents 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 a terminal group of a three-phase isolation transformer based on the terminal group of the main transformer and the terminal group of the platform transformer includes:
when a secondary winding of a main transformer is in Y-shaped wiring and a primary winding of a transformer in a transformer area is in Y-shaped wiring, determining that the primary winding of a three-phase isolation transformer is in Y-shaped wiring and the secondary winding is in Y-shaped wiring;
when a secondary winding of a main transformer is in Y-shaped connection and a primary winding of a transformer in a transformer area is in delta-shaped connection, determining that the primary winding of the three-phase isolation transformer is in Y-shaped connection and the secondary winding is in delta-shaped connection;
when a secondary winding of a main transformer is in delta connection and a primary winding of a transformer in a transformer area is in Y connection, determining that the primary winding of the three-phase isolation transformer is in delta connection and the secondary winding is in Y connection;
when the secondary winding of the main transformer is in delta connection and the primary winding of the transformer in the transformer area is in delta connection, the primary winding of the three-phase isolation transformer is determined to be in delta connection and the secondary winding of the three-phase isolation transformer is determined to be in delta connection.
In one possible embodiment, obtaining the capacitance current on each feeder line comprises:
wherein the content of the first and second substances,
indicating the total length of the corresponding cabling of the feeder,
representing the capacitive current corresponding to the cabling of the feeder,
representing the capacitive current corresponding to the overhead line of the feeder,
indicating the total length, I, of the overhead line of the feeder C Representing the total capacitive current for the feed line.
In a possible implementation manner, obtaining the capacitance current on each feeder line, and performing subnet division based on the capacitance current to obtain a plurality of subnets includes:
according to the capacitance current on each feeder line, constructing a subnet partition optimization model as follows:
wherein, L _ T ISO Representing the total number of sub-networks, i.e. the total number of three-phase isolating transformers, C sum (L_T ISO ) Represents the total cost of placing a three-phase isolation transformer,
respectively representing the sum of the capacitive currents of at least one of the feeders in the N sub-networks,
a threshold value representing a capacitance current;
and traversing all the subnet partition schemes based on the subnet partition optimization model, and determining the final subnet partition scheme to obtain a plurality of subnets.
In one possible embodiment, configuring a corresponding three-phase isolation transformer for each sub-network according to a wiring group of the three-phase isolation transformer includes:
according to the wiring group of the three-phase isolation transformer, determining that a primary winding of the three-phase isolation transformer is connected with a secondary winding of a main transformer, and determining that the secondary winding of the three-phase isolation transformer is connected with a primary winding of a transformer area; and the three-phase isolation transformer is connected with the transformer in the transformer area through a feeder line.
In one possible embodiment, the failure analysis is performed on each sub-network, and includes: and constructing a ground fault identification criterion, and carrying out ground fault judgment based on the ground fault identification criterion.
In one possible implementation, the ground fault identification criterion includes:
wherein, U A Represents the effective value of the phase voltage of the power distribution network u' 00 Representing the initial asymmetry of the voltage, d, under normal operating conditions of the distribution network system 0 Damping rate, d, indicating that the system has not failed g Representing the system damping rate associated by the transition resistance and the system capacitive reactance after a fault, j representing the complex imaginary operator,
represents the zero sequence voltage phasor of the system before the fault occurs,
the zero sequence voltage phasor after the fault is shown,
indicating the zero sequence voltage sudden change phasor before and after the fault,
and representing the amplitude of the abrupt zero sequence voltage phasor.
In a possible implementation, the ground fault determination based on the ground fault identification criterion includes:
judgment of
Whether a set first threshold value is exceeded or not
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 fault route selection analysis apparatus based on subnet partition, including an obtaining module, a determining module, a partitioning module, a configuring module, and a suppressing module;
the acquisition module is used for acquiring a wiring group of a main transformer at a transformer substation side and a wiring group of a transformer at a load side transformer area, and the main transformer is connected to different transformer areas through a plurality of feeders;
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 acquiring the capacitance current on each feeder line and dividing subnets based on the capacitance current to obtain a plurality of subnets, wherein each subnet comprises at least one feeder line;
and 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 so as to complete the suppression of the fault current.
And the suppression module is used for carrying out fault analysis on each subnet, determining the subnet with the fault and completing fault line selection analysis.
According to the fault line selection analysis method and device based on subnet segmentation, the power distribution network is segmented into the subnets, so that the configuration scheme of the three-phase isolation transformer is determined, workers can achieve fault current suppression of the power distribution network at the minimum cost, after the three-phase isolation transformer is configured, line selection analysis of ground faults is conducted, the three-phase isolation transformer can work normally for subnets without faults, and the three-phase isolation transformer can effectively suppress fault residual current for subnets with 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 required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
fig. 1 is a flowchart of a fault line selection analysis method based on subnet partition 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 route selection analysis device based on subnet partition according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a fault route selection analysis device based on subnet partition according to an embodiment of the present application.
Reference numbers and corresponding part names in the drawings:
21-acquisition module, 22-determination module, 23-segmentation module, 24-configuration module, 25-suppression module, 31-memory, 32-processor, 33-bus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the present application provides a fault line selection analysis method based on subnet partition, including:
s11, obtaining a wiring group of a main transformer at a transformer substation side and a wiring group of a transformer at a load side transformer area, wherein the main transformer is connected to different transformer areas through a plurality of 10kV feeders.
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.
A three-phase isolation transformer which is isolated with the same voltage class, namely 10kV/10kV, but has a non-communicated zero-sequence loop is adopted on a 10kV feeder of a power distribution network.
S13, obtaining the capacitance current on each 10kV feeder line, and carrying out subnet segmentation based on the capacitance current to obtain a plurality of subnets, wherein each subnet comprises at least one 10kV feeder line.
And S14, configuring a corresponding three-phase isolation transformer for each sub-network according to the wiring group of the three-phase isolation transformers, so that workers can install the three-phase isolation transformers for the sub-networks after being divided.
S15, after the three-phase isolation transformer is installed by workers, fault analysis is conducted on each sub-network, the sub-network with the fault is determined, fault line selection analysis is completed, and fault current corresponding to the sub-network with the fault is restrained through the three-phase isolation transformer.
The invention provides a fault line selection analysis method based on subnet segmentation, which is based on a three-phase isolation transformer general scheme of zero sequence blocking, considers a subnet segmentation optimal technical scheme of a fault current suppression effect and constructs a high-sensitivity earth fault identification criterion based on zero sequence voltage mutation, the three depend on progressive subnet segmentation and a new line selection criterion, the fault characteristics under earth fault are simultaneously displayed on the basis of reducing residual current flowing through a fault point under single-phase earth fault, a novel starting and line selection technology fitting the background of the earth line selection is constructed according to the fault characteristics, the technical problem of the traditional 'big difficulty' of high-resistance earth fault under single-phase earth fault is enhanced, the line selection technology is highly improved by a higher level, the technical development of the earth fault identification of a power distribution network is promoted, and the practical problem of great attention of the first line production is effectively and beneficially solved.
In one possible embodiment, the terminal group of the three-phase isolation transformer can be obtained by:
A. and obtaining a wiring group of a main transformer of the transformer substation corresponding to a 10kV feeder line connected with the same transformer substation, and judging whether a primary winding is Yn and a secondary winding is Y-shaped or whether the primary winding is Yn and the secondary winding is delta-shaped.
B. And acquiring the wiring group of the transformer at the load side station area of each loop of 10kV feeder line, 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 homotype relation of the transformer substation main transformer wiring group and the feeder load side wiring group, the wiring group of the three-phase isolation transformer is selected, namely: i) When a secondary winding of a main transformer of the transformer substation is Y and a primary winding of a load side transformer is Y, selecting primary and secondary winding connection groups of a three-phase isolation transformer to be in Y and Y forms 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 primary and secondary winding connection groups of the three-phase isolation transformer to be in Y and delta forms respectively; iii) When a secondary winding of a main transformer of a transformer substation is delta and a primary winding of a load side transformer is Y, selecting a primary and secondary winding connection group of a three-phase isolation transformer to be respectively in delta and Y forms; and iv) when the secondary winding of the main transformer of the transformer substation is delta and the primary winding of the load side transformer is delta, selecting the primary and secondary winding connection groups of the three-phase isolation transformer to be delta and delta respectively.
In one possible embodiment, obtaining the capacitance current on each 10kV feeder comprises:
wherein the content of the first and second substances,
indicating the total length of the feeder corresponding to the cabling,
representing the capacitive current corresponding to the cable run of the feeder,
representing the capacitive current corresponding to the overhead line of the feeder,
the total length of the overhead line of the feeder line is expressed in kilometers, I C Representing the total capacitive current for the feed line.
In a possible implementation manner, acquiring the capacitance current on each 10kV feeder, and performing subnet division based on the capacitance current to obtain a plurality of subnets, including:
and setting a subnet partition target according to the operation requirement of the distribution network or the fault current suppression effect. According to the requirement of the actual distribution network operation, particularly the lines in remote areas of the three-state one-city area in Sichuan, a subnet division mode is set, the set of each divided sub-feeder line does not exceed 3A, and the condition is relatively easy to achieve, because the lines in the three-state one-city area are mainly overhead lines, each feeder line generally does not exceed 50km, and the length of cables is generally concentrated at the outgoing line of a transformer substation; secondly, a sub-feeder network completely separated into the sum of the number of the independent sub-feeders is also possible, but the corresponding cost is relatively high. Therefore, according to the capacitance current on each 10kV feeder line, a subnet partition optimization model is constructed as follows:
wherein, L _ T ISO Denotes the total number of sub-networks, i.e. the total number of three-phase isolating transformers, C sum (L_T ISO ) Represents the total cost of placing a three-phase isolation transformer,
respectively representing the sum of the capacitance currents of at least one 10kV feeder in the N sub-networks,
representing the threshold of the capacitive current.
And traversing all the subnet partition schemes based on the subnet partition optimization model, and determining the final subnet partition scheme to obtain a plurality of subnets.
In one possible embodiment, configuring a corresponding three-phase isolation transformer for each sub-network according to a wiring group of the three-phase isolation transformer includes:
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 10kV feeder line.
Fig. 2 is an equivalent block diagram of a power distribution network based on three-phase transformer isolation, and the effect of suppressing fault current is achieved by arranging a three-phase isolation transformer.
In one possible implementation, the failure analysis is performed on each sub-network, and includes: and constructing a ground fault identification criterion, and carrying out ground fault identification based on the ground fault identification criterion.
In one possible embodiment, the ground fault identification criterion includes:
wherein, U A Represents the effective value of the phase voltage of the power distribution network u' 00 Representing the initial asymmetry of the voltage, d, under normal operating conditions of the distribution network system 0 Damping rate, d, indicating that the system has not failed g Representing the system damping rate associated by the transition resistance and the system capacitive reactance after the occurrence of a fault, j representing the imaginary operator of the complex number,
represents the zero sequence voltage phasor of the system before the fault occurs,
the zero sequence voltage phasor after the fault is shown,
indicating the zero sequence voltage sudden change phasor before and after the fault,
and representing the amplitude of the abrupt zero sequence voltage phasor.
In one possible embodiment, the ground fault discrimination based on the ground fault identification criterion includes:
judgment of
Whether a set first threshold value is exceeded or not
And if the set second threshold value is exceeded, judging that the ground fault exists, otherwise, judging that the ground fault does not exist.
The simulation is performed before and after the sub-network division, and the three-phase voltage and the three-phase current on the load side are measured to obtain the results shown in table 1.
TABLE 1 three-phase Voltage and three-phase Current electric quantities before and after subnet partition mode
According to table 1, it can be known that the subnet partition mode does not change the reliable power supply requirement of the original load, i.e. the three-phase voltage and the three-phase current are the same as those before the subnet partition mode is not adopted.
In addition, for the performance of the extracted line selection criterion, the ground fault experiment under different fault resistances is also carried out, and the experimental result is shown in table 2.
TABLE 2 Single-phase earth fault test under different transition resistances, sensitivity performance effect of the criterion
From table 2 it can be seen that: compared with a subnet segmentation mode, the subnet segmentation mode based on the three-phase transformer isolation zero-sequence network can effectively show fault characteristics, the zero-sequence voltage break variable is basically increased to about three times on average, the rule is kept unchanged along with the higher transition resistance, the high-transition-resistance ground fault with the same difficulty is obvious, and the subnet segmentation mode and the accompanying ground fault line selection criterion have better line selection capability and can better accord with the requirements of practical engineering application.
Example 2
As shown in fig. 3, an embodiment of the present application provides a fault route selection analysis apparatus based on subnet partition, which includes an obtaining module 21, a determining module 22, a partitioning module 23, a configuring module 24, and a suppressing module 25.
The obtaining module 21 is configured to obtain a connection group of a main transformer on the substation side and a connection group of a transformer on the load side, where the main transformer is connected to different transformer areas through multiple 10kV feeders.
The determination module 22 is configured to determine a terminal group of the three-phase isolation transformer based on the terminal group of the main transformer and the terminal group of the platform transformer.
The dividing module 23 is configured to obtain a capacitance current on each 10kV feeder line, and perform subnet division based on the capacitance current to obtain a plurality of subnets, where each subnet includes at least one 10kV feeder line.
The configuration module 24 is configured to configure a corresponding three-phase isolation transformer for each sub-network according to the connection group of the three-phase isolation transformer, 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 a fault current corresponding to the sub-network with the fault through the three-phase isolation transformer.
The device for analyzing a fault route selection based on subnet partition according to this embodiment can implement the method technical solution described in embodiment 1, and its beneficial effects and principles are similar, and are not described herein again.
Example 3
As shown in fig. 4, the present embodiment provides a fault line selection analysis device based on subnet partition, which includes a memory 31 and a processor 32, wherein the memory 31 and the processor 32 are connected to each other through a bus 33.
The memory 31 stores computer-executable instructions.
For example, the Memory may include, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Flash Memory (Flash Memory), a First In First Out (FIFO), a First In Last Out (FILO), and/or a First In Last Out (FILO); in particular, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field Programmable Gate Array), and a 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 referred to as a Central Processing Unit (CPU); 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) which is responsible for rendering and drawing contents required to be displayed on the display screen, for example, the processor may not be limited to a processor adopting a model STM32F105 series microprocessor, a Reduced Instruction Set Computer (RISC) microprocessor, an X86 or other architecture processor or an embedded neural Network Processor (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 (GPRS) wireless transceiver, a ZigBee wireless transceiver (ieee802.15.4 standard-based low power local area network protocol), a 3G transceiver, a 4G transceiver, and/or a 5G transceiver, etc. In addition, the device may also 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, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium is used for implementing the method for analyzing the fault route selection based on the subnet partition as described in embodiment 1.
Example 5
Embodiments of the present application may further provide a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for analyzing a fault route selection based on subnet segmentation as described in embodiment 1 is implemented.
According to the fault line selection analysis method and device based on subnet division, a configuration scheme of a three-phase isolation transformer is determined by dividing a power distribution network into a plurality of subnets, so that workers can realize fault current suppression of the power distribution network at the minimum cost, ground fault analysis is performed after the three-phase isolation transformer is configured, the three-phase isolation transformer can normally work for subnets without faults, and fault residual current can be effectively suppressed for subnets with faults, so that the purpose of fault current suppression is realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A failure route selection analysis method based on subnet partition is characterized by comprising the following steps:
the method comprises the steps that a wiring group of a main transformer on a transformer substation side and a wiring group of a transformer on a load side station area are obtained, and the main transformer is connected to different station area transformers through a plurality of feeders;
determining a 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 current on each feeder line, and performing subnet segmentation based on the capacitance current to obtain a plurality of subnets, wherein each subnet comprises at least one feeder line;
configuring a corresponding three-phase isolation transformer for each sub-network according to the wiring group of the three-phase isolation transformer;
and carrying out fault analysis on each subnet, determining the subnet with the fault, and completing fault line selection analysis.
2. The method for suppressing a fault current according to claim 1, wherein obtaining a terminal group of a substation-side main transformer and a terminal group of a load-side platform-area transformer comprises:
the method comprises the steps that a connection group of a main transformer on a transformer station side is obtained to be a first connection group or a second connection group, wherein the first connection group represents that a primary winding of the main transformer is Yn-shaped connection and a secondary winding of the main transformer is Y-shaped connection; the second wiring group represents that a primary winding of the main transformer is Yn-shaped wiring and a secondary winding of the main transformer is delta-shaped wiring;
the method comprises the steps that a connection group of a load side platform area transformer is obtained to be a third connection group or a fourth connection group, wherein the third connection group represents that a primary winding of the platform area transformer is a Y-shaped connection and a secondary winding of the platform area transformer is a Yn-shaped connection; and the fourth wiring group represents that the primary winding of the transformer in the transformer area is delta-shaped wiring and the secondary winding is Yn wiring.
3. The fault current suppression method according to claim 2, wherein determining a terminal group of a three-phase isolation transformer based on the terminal group of the main transformer and the terminal group of the block transformer comprises:
when a secondary winding of a main transformer is in Y-shaped connection and a primary winding of a transformer in a transformer area is in Y-shaped connection, determining that the primary winding of a three-phase isolation transformer is in Y-shaped connection and the secondary winding is in Y-shaped connection;
when a secondary winding of a main transformer is in Y-shaped connection and a primary winding of a transformer in a transformer area is in delta-shaped connection, determining that the primary winding of a three-phase isolation transformer is in Y-shaped connection and the secondary winding is in delta-shaped connection;
when a secondary winding of a main transformer is in delta connection and a primary winding of a transformer in a transformer area is in Y connection, determining that the primary winding of the three-phase isolation transformer is in delta connection and the secondary winding is in Y connection;
when the secondary winding of the main transformer is delta-shaped connection and the primary winding of the transformer in the transformer area is delta-shaped connection, the primary winding of the three-phase isolation transformer is determined to be delta-shaped connection and the secondary winding is determined to be delta-shaped connection.
4. The fault current suppression method according to claim 3, wherein obtaining the capacitive current on each feeder line comprises:
wherein the content of the first and second substances,
indicating the total length of the corresponding cabling of the feeder,
representing the capacitive current corresponding to the cabling of the feeder,
representing the capacitive current corresponding to the overhead line of the feeder,
indicating the total length, I, of the overhead line of the feeder C Representing the total capacitive current for the feed line.
5. The method according to claim 1, wherein the obtaining of the capacitance current on each feeder line and the performing of the subnet division based on the capacitance current to obtain a plurality of subnets comprises:
according to the capacitance current on each feeder line, constructing a subnet partition optimization model as follows:
wherein, L _ T ISO Denotes the total number of sub-networks, i.e. the total number of three-phase isolating transformers, C sum (L_T ISO ) Represents the total cost of placing a three-phase isolation transformer,
respectively representing the sum of the at least one feeder capacitance current in the N subnetworks,
a threshold value representing a capacitive current;
and traversing all the subnet partitioning schemes based on the subnet partitioning optimization model, determining the final subnet partitioning scheme, and obtaining a plurality of subnets.
6. The method according to claim 3, wherein configuring a corresponding three-phase isolation transformer for each sub-network according to the connection group of the three-phase isolation transformer comprises:
according to the wiring group of the three-phase isolation transformer, determining that a primary winding of the three-phase isolation transformer is connected with a secondary winding of a main transformer, and determining that the secondary winding of the three-phase isolation transformer is connected with a primary winding of a transformer area; and the three-phase isolation transformer is connected with the transformer in the transformer area through a feeder line.
7. The fault current suppression method according to claim 1, wherein performing fault analysis on each sub-network comprises: and constructing a ground fault identification criterion, and carrying out ground fault judgment based on the ground fault identification criterion.
8. The fault current suppression method according to claim 7, wherein the ground fault identification criteria comprises:
wherein, U A Represents the effective value of the phase voltage of the power distribution network u' 00 Representing the initial asymmetry of the voltage, d, under normal operating conditions of the distribution network system 0 Damping rate, d, indicating that the system has not failed g Representing the system damping rate associated by the transition resistance and the system capacitive reactance after the occurrence of a fault, j representing the imaginary operator of the complex number,
represents the zero sequence voltage phasor of the system before the fault occurs,
the zero sequence voltage phasor after the fault is shown,
indicating the zero sequence voltage sudden change phasor before and after the fault,
and representing the amplitude of the abrupt zero sequence voltage phasor.
9. The method for suppressing a fault current according to claim 8, wherein performing a ground fault determination based on the ground fault identification criterion comprises:
judgment of
Whether a set first threshold value is exceeded or not
And if the set second threshold value is exceeded, judging that the ground fault exists, otherwise, judging that the ground fault does not exist.
10. A failure route selection analysis device based on subnet partition is characterized by comprising an acquisition module, a determination module, a partition module, a configuration module and a suppression module;
the acquisition module is used for acquiring a wiring group of a main transformer at a transformer substation side and a wiring group of a transformer at a load side transformer area, and the main transformer is connected to different transformer areas through a plurality of feeders;
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 acquiring the capacitance current on each feeder line and dividing subnets based on the capacitance current to obtain a plurality of subnets, wherein each subnet comprises at least one feeder line;
and 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 so as to complete the suppression of the fault current.
And the suppression module is used for performing fault analysis on each subnet, determining the subnet with the fault and completing fault line selection analysis.
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