CN115149495A

CN115149495A - Method and device for self-adaptive adjustment of power distribution network protection

Info

Publication number: CN115149495A
Application number: CN202210760541.9A
Authority: CN
Inventors: 冯肖; 远方; 李东; 赵曜; 胡岸; 张向伍; 郑腾霄; 朱莹
Original assignee: State Grid Corp of China SGCC; Information and Telecommunication Branch of State Grid Henan Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Information and Telecommunication Branch of State Grid Henan Electric Power Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-10-04

Abstract

The invention provides a method and a device for self-adaptive adjustment of power distribution network protection, wherein the method comprises the following steps: determining the number of the tower according to the main line and the branch line respectively based on the distance from the transformer substation; re-determining the transformer capacity between any adjacent protection devices based on the determined number of the tower and the changed information; determining the grade corresponding to the target protection device based on a capacity sharing principle; determining a setting value of the target protection device based on the grade corresponding to the target protection device by combining with a constant value rule of the main line or branch line protection device; and if the setting value of the target protection device is determined to be changed, remotely adjusting the target protection device. The invention can realize real-time protection of the power distribution network and automatically complete self-adaptive setting by monitoring the power distribution network equipment in real time, acquiring the change information, grading the protection devices, automatically calculating the setting value of each protection device according to the setting value rules of the protection devices on different lines and carrying out remote adjustment.

Description

Method and device for self-adaptive adjustment of power distribution network protection

Technical Field

The invention relates to the field of power station management, in particular to a method and a device for self-adaptive adjustment of power distribution network protection.

Background

With the popularization of distribution automation equipment, after a distribution network protection device sets a fixed value, the protection device calculates a medium current value by measuring physical values such as waveforms on a line and the like, performs logical calculation and comparison with the set fixed value to determine whether to send signals such as tripping operation and the like, and when the signals are tripping information, the protection device executes tripping operation.

At present, two types of setting modes of a power distribution protection device are mainly used, one is to calculate the grade and the fixed value of power distribution network equipment through line data in a power distribution automation system and carry out remote setting, and the other is to reach an equipment site and manually set the fixed value of the equipment. The two setting modes require field personnel to inquire all equipment lines on the distribution line, transformer capacities under all switches on a main line and a branch line are manually calculated, the switch grades are divided according to the principle that the capacities under the switches are equally divided as much as possible, and setting values of all the switches are calculated through the switch grades. In the distribution automation system, the setting of the protection device has large calculation amount and non-uniform calculation mode, the fixed value of the protection device cannot be checked in real time, and when a line or equipment is changed, the fixed value of the protection device cannot be changed in real time, so that the distribution automation application reality cannot be effectively adapted.

Disclosure of Invention

The invention provides a method and a device for self-adaptive adjustment of power distribution network protection, which are used for solving the problems that in the related art, the setting value calculation modes of protection devices in a power distribution system are not uniform, the setting values of the protection devices cannot be checked in real time, and when lines or equipment are changed, the setting values of the protection devices cannot be changed in real time, so that the practical application of power distribution automation cannot be effectively adapted.

In a first aspect, the present invention provides a method for adaptively adjusting protection of a power distribution network, including: respectively determining the number of the tower according to the main line and the branch lines based on the distance from the transformer substation;

re-determining the transformer capacity between any adjacent protection devices based on the number of the tower and the changed information, and taking the transformer capacity as the transformer capacity corresponding to the target protection device; the protection devices are all positioned on the tower, and the target protection device is a protection device with a smaller number of the tower; the changed information comprises changed information of equipment and changed information of a line;

determining the grade corresponding to the target protection device based on a capacity sharing principle and the transformer capacity corresponding to the target protection device;

determining a setting value of the target protection device based on the grade corresponding to the target protection device by combining a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, wherein the setting value of the target protection device comprises a fixed value current and trip duration;

and if the setting value of the target protection device is determined to be changed compared with the set value, remotely adjusting the target protection device.

Optionally, the determining, based on a capacity sharing principle and the transformer capacity corresponding to the target protection device, a level corresponding to the target protection device includes:

determining that the target protection device is located on a main line or a branch line based on the number of the tower where the target protection device is located;

if the target protection device is located in the main line, determining the grade of the main line corresponding to the target protection device based on the transformer capacity corresponding to the target protection device according to a capacity sharing principle; the dominant line rank comprises at most three levels;

if the target protection device is located on a branch line, determining the branch line grade corresponding to the target protection device according to a capacity sharing principle based on the transformer capacity corresponding to the target protection device; the branch line levels include at most three levels.

Optionally, the determining the setting value of the target protection device based on the grade corresponding to the target protection device in combination with a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device includes:

determining the grade corresponding to the target protection device as a main line grade or a branch line grade;

if the grade corresponding to the target protection device is a main line grade, determining a setting value of the target protection device based on a setting value rule of the main line protection device and a setting value of a transformer substation;

and if the grade corresponding to the target protection device is a branch grade, determining a setting value of the target protection device based on a fixed value rule of the branch protection device and the transformer capacity corresponding to the target protection device.

Optionally, if the grade corresponding to the target protection device is a main line grade, determining a setting value of the target protection device based on a setting value rule of the main line protection device and a setting value of the substation includes:

acquiring a setting value of the transformer substation, wherein the setting value of the transformer substation comprises rated current and first tripping time;

if the first tripping time length is a first fixed value, determining the fixed value current and the tripping time length of the target protection device based on a main line first fixed value rule in the fixed value rules of the main line protection device and the main line grade of the target protection device;

if the first trip duration is a second fixed value, determining a fixed value current and trip duration of the target protection device based on a main line second fixed value rule in the fixed value rules of the main line protection device and the main line grade of the target protection device;

the first fixed value is greater than the second fixed value.

Optionally, if the first trip duration is a first fixed value, determining a fixed value current and a trip duration of the target protection device based on a main line first fixed value rule in the fixed value rules of the main line protection device and a main line class of the target protection device, includes:

determining a specific grade number of a main line grade of the target protection device;

if the target protection device belongs to the primary main line stage, determining that the constant current of the target protection device is a first multiple of the rated current, and the tripping time length is a second tripping time length;

if the target protection device belongs to the main line secondary level, determining that the constant current of the target protection device is a second multiple of the rated current, and the trip time is a third trip time;

if the target protection device belongs to the main line three-level, determining that the constant current of the target protection device is a third multiple of the rated current, and the tripping time length is a fourth tripping time length;

the first multiple, the second multiple and the third multiple are sequentially decreased in a decreasing manner, and the first fixed value, the second tripping time, the third tripping time and the fourth tripping time are sequentially decreased in a decreasing manner.

Optionally, if the first trip duration is a second fixed value, determining the fixed value current and the trip duration of the target protection device based on a second main line fixed value rule in the fixed value rules of the main line protection device and the main line class of the target protection device includes:

if the target protection device belongs to the primary main line level, determining that the constant current of the target protection device is a fourth multiple of the rated current, and the trip time length is a fifth trip time length;

if the target protection device belongs to the main line secondary level, determining that the constant current of the target protection device is a fifth multiple of the rated current, and the trip time length is a sixth trip time length;

if the target protection device belongs to the main line three-level, determining that the constant current of the target protection device is the sixth multiple of the rated current, and the tripping time length is the seventh tripping time length;

the fourth multiple, the fifth multiple and the sixth multiple are sequentially decreased in number, and the second fixed value, the fifth trip duration, the sixth trip duration and the seventh trip duration are sequentially decreased in number.

Optionally, if the grade corresponding to the target protection device is a branch grade, determining a setting value of the target protection device based on a setting value rule of the branch protection device and a transformer capacity corresponding to the target protection device includes:

determining a specific grade of a branch grade of the target protection device;

if the target protection device is at the level of a branch line, determining constant current corresponding to the capacity of all transformers between adjacent protection devices of the same branch line as the target protection device as standard current; the adjacent protection devices are the protection devices belonging to the secondary branch line;

if the first tripping time length is a first fixed value, determining that the fixed-value current of the target protection device is a seventh multiple of the standard current, wherein the tripping time length of the target protection device is obtained by subtracting a first preset value from the tripping time length of the first main line protection device;

if the first tripping time length is a second fixed value, determining that the fixed value current of the target protection device is a seventh multiple of the standard current, and the tripping time length of the target protection device is zero;

the first main line protection device is the protection device existing between the substation and the target protection device and located on a main line.

In a second aspect, the present invention further provides a device for adaptively adjusting protection of a power distribution network, including:

the numbering module is used for respectively determining the number of the tower according to the main line and the branch line based on the distance from the transformer substation;

the capacity module is used for re-determining the transformer capacity between any adjacent protection devices based on the number of the tower and the changed information, and the re-determined transformer capacity is used as the transformer capacity corresponding to the target protection device; the protection devices are all positioned on the tower, and the target protection device is a protection device with a smaller number of the tower; the changed information comprises changed information of equipment and changed information of a line;

the grade module is used for determining the grade corresponding to the target protection device based on a capacity sharing principle and the transformer capacity corresponding to the target protection device;

the setting value module is used for determining a setting value of the target protection device based on the grade corresponding to the target protection device by combining a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, and the setting value comprises a fixed value current and trip duration;

and the adjusting module is used for remotely adjusting the target protection device if the setting value of the target protection device is determined to be changed compared with the set value.

In a third aspect, the present invention also provides an electronic device, comprising a memory, a transceiver, a processor;

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and implementing the method for adaptive adjustment of power distribution network protection according to the first aspect.

In a fourth aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for adaptive adjustment of power distribution network protection according to the first aspect described above.

In a fifth aspect, the present invention also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for adaptive adjustment of power distribution network protection according to the first aspect is implemented.

According to the method and the device for self-adaptive adjustment of power distribution network protection, the power distribution network equipment is monitored in real time, the equipment information on the line where the protection device is located is obtained, the grades of the protection devices are divided according to the capacity sharing principle, the setting values of the protection devices are automatically calculated according to the fixed value rules of the protection devices on different lines, and the protection devices with the changed setting values are adjusted through the power distribution automation system, so that the real-time protection of the power distribution network is realized, the self-adaptive setting is automatically completed, the circuit protection accuracy is improved, the protection management effect of the distribution network is improved, the base layer operation and inspection burden is reduced, and the requirement of the construction scale of the distribution network is continuously adapted.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method for adaptively adjusting protection of a power distribution network according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a device for adaptively adjusting protection of a power distribution network according to an embodiment of the present invention;

fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.

The method for the self-adaptive adjustment of the power distribution network protection establishes real-time monitoring on the change of field equipment, automatically calculates the setting value of the protection device and issues the setting value, realizes the whole-process application of the protection setting value such as on-line automatic setting, configuration, check, real-time adjustment and the like, promotes the whole-process electronic mobile management of the distribution network protection setting value, ensures that the correct action rate of the self-adaptive protection reaches more than 95%, enables a base-level team group, effectively improves the working efficiency of the base-level team group, improves the protection management effect of the distribution network, reduces the operation and inspection burden of the base-level team group, and continuously adapts to the requirement of the construction scale of the distribution network.

Fig. 1 to fig. 3 are used to describe a method and an apparatus for adaptive adjustment of power distribution network protection according to the present invention.

Fig. 1 is a schematic flow diagram of a method for adaptively adjusting protection of a power distribution network according to an embodiment of the present invention. As shown in fig. 1, the method includes:

step 101, determining the number of a tower according to a main line and a branch line respectively based on the distance from a transformer substation;

specifically, the existing circuit is distributed from a substation to each household by arranging corresponding towers to support corresponding cables and transmit the electricity output by the substation to each corresponding household, and the arrangement of the towers is generally divided into main lines and branch lines, wherein the main lines, the branch lines and the substation form a tree structure together, the substation is equivalent to a root, the main lines are used as a trunk of the tree structure, and the branch lines are used as branches of the tree structure. The main line is larger in area corresponding to jurisdiction, and the branch line is smaller in area corresponding to jurisdiction, for example, the output electric quantity of the transformer substation is transmitted to each corresponding urban area through the main line, and the branch line transmits the electric quantity of a certain urban area to a corresponding village or cell. The cables of the main lines or the branch lines are mainly supported by the arranged towers, and in addition, transformers, protection devices and the like can be arranged on the towers. Instead of arranging the transformer and the protection device on each tower, the arrangement of the transformer and the protection device on the towers may be performed at intervals of a certain number, and the arrangement of the transformer and the protection device on the towers is performed only when the number of the towers is specifically increased, or the arrangement is set according to the capacity of the transformer or the power requirement of the mounted electronic equipment. According to the distance from the tower to the transformer substation, the towers are numbered according to the main line and then the branch lines, so that whether the transformers or the protection devices arranged on the towers belong to the main line or the branch lines and the distance from the transformers or the distance from the transformers to the substation can be determined according to the number of the towers.

102, re-determining the transformer capacity between any adjacent protection devices based on the number of the tower and the changed information, wherein the transformer capacity is used as the transformer capacity corresponding to the target protection device; the protection devices are all positioned on the tower, the target protection device is a protection device with a smaller number of the tower where the target protection device is located; the changed information comprises changed information of equipment and changed information of a line;

specifically, in the entire power distribution network, the corresponding power distribution network device may need to be replaced due to the service life requirement of the corresponding device, or some new device or new devices are added, or some devices are reduced, and corresponding change information is generated when the line of a main line or a branch line is changed, for example, the line is added, reduced, or merged. The method comprises the steps of monitoring power distribution network equipment and lines in a station in real time, acquiring change information in real time, determining the line of the changed specific line or the corresponding power distribution network equipment and a nearby protection device by using the change information and the number of a tower, re-determining the transformer capacity of all the protection devices in the whole power distribution network, and calculating the transformer capacity between any adjacent protection devices to serve as the transformer capacity of the protection device with the smaller number of the tower located in the adjacent protection devices, namely the transformer capacity of a target protection device. For example, any two adjacent protection devices are a protection device a and a protection device B, where the number of the tower on which the protection device a is located is smaller than the number of the tower on which the protection device B is located, and the transformer capacity corresponding to the protection device a (target protection device) is set as the sum of the transformer capacities between the protection device a and the protection device B. And according to the method, the transformer capacities of all the protection devices on the main line and the branch line of the whole power grid are sequentially determined again. And determining the transformer capacity of the protection device farthest from the transformer substation according to the sum of the powers of the electronic equipment mounted under the protection device.

103, determining a grade corresponding to the target protection device based on a capacity sharing principle and the transformer capacity corresponding to the target protection device;

after the transformer capacities of all the protection devices in the whole power distribution network are re-determined, the protection devices are graded according to a capacity sharing principle. For example, the protection devices are sorted according to their transformer capacities, and the interval corresponding to each class is determined, and if the transformer capacity of a certain protection device satisfies the corresponding interval, the class of the protection device is determined. Or the grade is divided according to the main line and the branch line, and the grade of each protection device belonging to the main line protection device or the grade of each protection device belonging to the branch line protection device is determined. The main line protection device is a first level close to the substation, the main line protection device can be divided into a plurality of levels, the specific number of the levels can be set according to actual requirements, and the level of the main line protection device is usually at most three levels. The branch line protection device close to the main line outgoing point is a first level, the branch line protection device can also be divided into a plurality of levels, the specific number of the levels can be set according to actual requirements, and the level of the branch line protection device is usually at most three levels.

104, determining a setting value of the target protection device based on a grade corresponding to the target protection device and by combining a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, wherein the setting value comprises a fixed value current and a trip duration;

specifically, after the grade of each protection device and the transformer capacity of each protection device are determined according to the rules, the setting values of the protection devices are determined according to two constant value rules.

If the protection device is located on the main line, determining the constant current and the trip time of the protection device according to the constant value rule of the main line protection device;

and if the protection device is positioned on the branch line, determining the constant current and the trip time of the protection device according to the constant rule of the branch line protection device.

Therefore, the fixed value current and the tripping time of the protection device can be set more flexibly through the fixed value rules corresponding to different lines, and the modification and the operation are more convenient in the practical application process.

And 105, if the setting value of the target protection device is determined to be changed compared with the set value, remotely adjusting the target protection device.

After the setting value of each protection device is determined by the method, the newly calculated setting value of a certain protection device is sequentially determined to be compared with the currently set setting value of the protection device, if the newly calculated setting value of the protection device is inconsistent with the currently set setting value, recording is carried out, the currently calculated setting value of the protection device is transmitted to the distribution automation system through the interface, and the distribution automation system carries out remote self-adaptive adjustment or setting on the protection device. And after the adjustment or the setting of the protection device with the changed setting value is completed, updating the setting value information of the protection device in the data center station.

The method for the self-adaptive adjustment of the power distribution network protection, provided by the invention, comprises the steps of monitoring power distribution network equipment in real time, acquiring equipment information on a line where a protection device is located, dividing the grades of the protection devices according to a capacity sharing principle, automatically calculating the setting values of the protection devices according to the setting value rules of the protection devices on different lines, and adjusting the protection devices with the changed setting values through a power distribution automation system, so that the real-time protection of the power distribution network is realized, the self-adaptive setting is automatically completed, the circuit protection accuracy is improved, the distribution network protection management effect is improved, the basic unit operation inspection burden is reduced, and the requirement of the distribution network construction scale is continuously adapted.

Optionally, the determining a grade corresponding to the target protection device based on a capacity sharing principle and a transformer capacity corresponding to the target protection device includes:

Specifically, because the towers are numbered according to the main line and the branch line based on the distance from the substation, the target protection device can be determined to be located on the main line or the branch line according to the number of the tower where the target protection device is located, and the distance between the target protection device and the substation can be determined according to the number of the number.

After the target protection device is located on the main line, the protection devices on the main line are subjected to grade division according to the transformer capacity of the target protection device and a capacity equipartition principle, the level close to the transformer substation is the first level, the number of the grades of the main line protection device can be set according to requirements, and the maximum number of the grades of the main line protection device is three levels.

After the target protection device is located on the branch line, according to the transformer capacity of the target protection device and according to a capacity sharing principle, the protection device on the main line is subjected to grade division, the position close to the outlet point of the main line is the first grade, the grade number of the branch line protection device can be set according to requirements, and the maximum number is three.

Specifically, after determining that the grade corresponding to the target protection device is a main line grade or a branch line grade, the setting value of the target protection device needs to be determined by combining with a corresponding fixed value rule. For example, if the grade corresponding to the target protection device is determined to be the main line grade, the setting value of the target protection device is determined by combining the setting value rule of the main line protection device and the setting value of the transformer substation. Or determining that the grade corresponding to the target protection device is a branch grade, and determining a setting value of the target protection device based on a setting value rule of the branch protection device and the transformer capacity corresponding to the target protection device.

Optionally, if the grade corresponding to the target protection device is a main line grade, determining a setting value of the target protection device based on a setting value rule of the main line protection device and a setting value of the substation, including:

the first fixed value is greater than the second fixed value.

Specifically, rated current and a first trip time of a transformer substation are obtained; and then determining that the first trip time length meets a first fixed value or a second fixed value, wherein the first fixed value is greater than the second fixed value, further judging which sub-rule in the fixed value rule of the main line protection device should be adopted, and determining the setting value of the target protection device according to the corresponding sub-rule, namely determining the fixed value current and the trip time length of the target protection device. By the mode, layered management can be realized according to different requirements and the grade of the main line of the protection device, and setting values of all target protection devices can be set more flexibly.

if the target protection device belongs to the main line three-level, determining that the constant current of the target protection device is a third multiple of the rated current, and the trip time length is a fourth trip time length;

Specifically, the rated current P0 and the first tripping time A1 of the transformer substation are obtained through the method, and the first tripping time A1 is a first fixed value; and determining the grade of the main line of the target protection device, wherein the grade can be a main line primary grade, a main line secondary grade or a main line tertiary grade.

When the target protection device is at the main line primary level, the constant current of the target protection device is a first multiple P1 of the rated current, and the tripping time length is a second tripping time length A2;

when the target protection device is a main line secondary stage, the constant current of the target protection device is a second multiple P2 of the rated current, and the tripping time is a third tripping time A3;

when the target protection device is in a main line three-level mode, the constant current of the target protection device is a third multiple P3 of the rated current, and the tripping time length is a fourth tripping time length A4;

wherein 1 >. And typically the A1 value is less than 1, all trip time periods are in seconds and the rated or fixed current is in amps.

Optionally, if the first trip duration is a second fixed value, determining a fixed value current and a trip duration of the target protection device based on a second fixed value rule of the main line in the fixed value rule of the main line protection device and the main line class of the target protection device, includes:

determining a specific grade of a main line grade of the target protection device;

if the target protection device belongs to the main line secondary level, determining that the constant current of the target protection device is a fifth multiple of the rated current, and the tripping time length is a sixth tripping time length;

if the target protection device belongs to the main line three-level, determining that the constant current of the target protection device is the sixth multiple of the rated current, and the trip time length is the seventh trip time length;

the fourth multiple, the fifth multiple and the sixth multiple are sequentially decreased in number, and the second fixed value, the fifth trip time length, the sixth trip time length and the seventh trip time length are sequentially decreased in number.

Specifically, the rated current P0 and the first tripping time A1 'of the transformer substation are obtained through the method, and the rated current A1' is a second fixed value; and determining the grade of the main line of the target protection device, wherein the grade can be a main line primary grade, a main line secondary grade or a main line tertiary grade.

When the target protection device is at the main line primary level, the constant current of the target protection device is a fourth multiple P4 of the rated current, and the trip time length is a fifth trip time length A5;

when the target protection device is a main line secondary stage, the constant current of the target protection device is a fifth multiple P5 of the rated current, and the tripping time length is a sixth tripping time length A6;

when the target protection device is a main line three-level device, the constant current of the target protection device is a sixth multiple P6 of the rated current, and the tripping time duration is a seventh tripping time duration A7;

wherein 1 ≧ P4 ≧ P5 ≧ P6>0, A1> A1' > A5> A6> A7 ≧ 0. And typically the A1' value is less than 1 second.

It is to be understood that the above is merely exemplary, and the three main line ranks are not to be taken as specific limitations of the main line rank division in the present invention. The main line grade can be increased by the corresponding grade number according to the actual application requirement, and the fixed value rule of the corresponding main line protection device can also be correspondingly adjusted according to the method, which all belong to the protection scope of the invention.

determining the specific grade of the branch grade of the target protection device;

Specifically, the rated current and the first trip time of the transformer substation are obtained through the method, when the target protection device is located on a branch line, the adjacent protection device located on the same branch line with the target protection device needs to be determined, all transformer capacities between the target protection device and the adjacent protection device are obtained, and the constant current corresponding to all transformer capacities between the target protection device and the adjacent protection device is determined to serve as the standard current based on the preset relation between the transformer capacities and the constant current.

The preset relationship between the transformer capacity and the constant value current can be represented as follows:

rated constant current (A) = Z; wherein Z is a positive number, and the value is 17.32 according to relevant data statistics. Of course, this value may need to be adjusted according to the change of the environment or application, and is not fixed. But once set, subsequent calculations are determined based on this set value.

For example, if the capacity of all transformers between the target protection device and the adjacent protection device is M, which is determined according to the above method, the corresponding constant current, i.e., the standard current, is M/Z.

The specific grade number of the branch grade of the target protection device is determined, and the grade number may be branch grade one, branch grade two, branch grade three and the like. And determining a protection device located on a main line, namely a first main line protection device, between the substation and the target protection device, and acquiring the trip time length A8 of the first main line protection device.

And then determining that the first tripping time of the transformer substation is a first fixed value or a second fixed value, wherein the first fixed value is greater than the second fixed value.

When the first tripping time of the transformer substation is a first fixed value and the target protection device is a branch line level, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, wherein the tripping time of the target protection device is A8 minus a first preset value, and the first preset value is smaller than the first fixed value; wherein, P7 is a positive integer, can be configured to be 3, 4 and 5, and has a default value of 3.

And when the first tripping time of the transformer substation is a second fixed value and the target protection device is a branch line level, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, and the tripping time of the target protection device is zero.

In addition, if the first main line protection device does not exist, the trip time length of the target protection device is half of the first trip time length.

The setting values of the main line and each branch line can be configured according to the field situation.

Similarly, if the target protection device is a secondary branch line, determining constant current corresponding to the capacity of all transformers between adjacent protection devices of the same branch line as the target protection device, and using the constant current as standard current; the adjacent protection devices belong to a branch line three-level protection device;

when the first tripping time of the transformer substation is a first fixed value and the target protection device is a branch line secondary stage, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, the tripping time of the target protection device is zero, and the first preset value is smaller than the first fixed value;

when the first tripping time of the transformer substation is a second fixed value and the target protection device is a branch line secondary level, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, and the tripping time of the target protection device is zero;

in addition, if no other protection device exists between the substation and the branch line, the trip time of the target protection device is one fourth of the first fixed value.

Similarly, if the target protection device is a branch line with three levels, determining constant current corresponding to the capacity of all transformers between adjacent protection devices of the same branch line as the target protection device, and using the constant current as standard current; the adjacent protection devices are the protection devices belonging to a branch line three-stage protection device or a branch line four-stage protection device;

when the first tripping time of the transformer substation is a first fixed value and the target protection device is a branch line secondary stage, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, and the tripping time of the target protection device is zero;

and when the first tripping time of the transformer substation is a second fixed value and the target protection device is a branch secondary, determining that the fixed value current of the target protection device is a seventh multiple P7 of the standard current, and the tripping time of the target protection device is zero.

The method for adaptively adjusting the protection of the power distribution network provided by the invention is described in the following by specific examples.

(1) And monitoring the change information of the power distribution network equipment and the line information in the data in real time, wherein the change information comprises newly added equipment, reduced equipment, updated equipment, newly added, reduced or combined lines and the like.

(2) And sequencing the towers of the line on which the change equipment is positioned according to the main line and the branch line.

(3) And calculating the transformer capacity between the protection device and the next protection device according to the relations between the tower and the protection device and between the tower and the transformer.

(4) According to the transformer capacity under the protection device, the protection device on the main line is graded according to the principle of dividing the capacity equally as much as possible, the protection device close to the transformer substation is the first grade, and the grade of the main line protection device is at most three grades.

(5) According to the transformer capacity under the protection device, the protection devices on the branch lines are graded according to the principle that the capacity is equally divided as much as possible, the grade close to a main line outlet point is a first grade, and the grade of the branch line protection device is at most three grades.

(6) And automatically calculating the setting value of the protection device according to the grade corresponding to the protection device and the constant value rule of the main line protection device or the constant value rule of the branch line protection device.

Firstly, determining the tripping time length and rated current of a transformer substation; and when the protection device is positioned on the main line, calculating the setting value of the protection device according to the main line protection device setting value rule.

The constant value rule of the main line protection device is as follows:

when the tripping time of the protection device in the transformer substation is 0.5s, the constant current of the main line primary protection device is 0.8 times of the rated current in the substation, and the tripping interval time is 0.3s; the constant value current of the main line secondary protection device is 0.6 times of the rated current in the station, and the tripping interval time is 0.15s; the constant current of the main line three-level protection device is 0.6 times of the rated current in the station, and the trip interval time is 0s.

When the tripping time of the protection device in the transformer substation is 0.3s, the constant current of the main line primary protection device is 0.8 times of the rated current in the substation, and the tripping interval time is 0.15s; the constant value current of the main line secondary protection device is 0.6 times of the rated current in the station, and the trip interval time is 0s; the constant current of the main line three-level protection device is 0.6 times of the rated current in the station, and the trip interval time is 0s.

When the protection device is positioned on the branch line, the setting value of the protection device is calculated according to the fixed value rule of the branch line protection device.

Wherein, the definite value rule of the branch line protection device is as follows:

when the tripping time of a protection device in a transformer substation is 0.5s, the constant current of a primary protection device of a branch line is k times of the constant current corresponding to the capacity of all distribution transformers between two adjacent protection devices of the primary protection device and the secondary protection device of the branch line, and the tripping interval time is the tripping time of the protection device corresponding to the main line minus 0.15s (if no other protection device exists between the transformer substation and the branch line, the tripping interval time of the primary protection device of the branch line is set to be 0.25 s); the constant value current of the secondary protection device of the branch line is k times of the constant value current corresponding to the capacity of all distribution transformers between two adjacent protection devices of the secondary protection device of the branch line and the tertiary protection device of the branch line, and the trip interval time is 0s (if no other protection device exists between a transformer substation and the branch line, the trip interval time of the secondary protection device of the branch line is set to be 0.125 s); the constant value current of the branch line three-level protection device is k times of the constant value current corresponding to the capacity of all distribution transformers between the branch line three level and between two adjacent protection devices after the branch line three level, and the trip interval time is 0s.

When the tripping time of the protection device in the transformer substation is 0.3s, the constant current of the branch line primary protection device is k times of the constant current corresponding to the capacity of all distribution transformers between two adjacent protection devices of the branch line primary and the branch line secondary, and the tripping interval time is 0s (if no other protection device exists between the transformer substation and the branch line, the tripping interval time of the branch line primary protection device is set to be 0.15 s); the constant value current of the secondary protection device of the branch line is k times of the constant value current corresponding to the capacity of all distribution transformers between two adjacent protection devices of the secondary protection device of the branch line and the tertiary protection device of the branch line, and the tripping interval time is 0s (if no other protection device exists between a transformer substation and the branch line, the tripping interval time of the secondary protection device of the branch line is set to be 0.075 s); the constant value current of the branch line three-level protection device is k times of the constant value current corresponding to the capacity of all distribution transformers between the branch line three level protection device and between two adjacent protection devices after the branch line three level protection device, and the tripping interval time is 0s.

Where k is a configurable item with a value of 3, 4, 5 and a default value of 3. The customer can configure the values of the main line and each branch line of the line according to the field situation.

(7) And comparing the fixed value calculated by each protection device with the fixed value set by the current equipment.

(8) And recording the protection device with the current fixed value inconsistent with the last set fixed value, and transmitting the fixed value information of the protection device to the distribution automation system through the interface.

(9) And the distribution automation system remotely carries out self-adaptive setting on the protection device.

(10) And after the field protection device is set, updating the setting value information of the protection device in the data center station.

Fig. 2 is a schematic structural diagram of a device for adaptively adjusting protection of a power distribution network according to an embodiment of the present invention. As shown in fig. 2, the apparatus includes:

the numbering module 201 is used for respectively determining the numbers of the towers according to the main line and the branch line based on the distance from the transformer substation;

a capacity module 202, configured to re-determine, based on the number of the tower and the changed information, a transformer capacity between any adjacent protection devices, where the transformer capacity is used as a transformer capacity corresponding to a target protection device; the protection devices are all positioned on the tower, and the target protection device is a protection device with a smaller number of the tower; the changed information comprises changed information of equipment and changed information of a line;

the grade module 203 is configured to determine a grade corresponding to the target protection device based on a capacity equalization principle and a transformer capacity corresponding to the target protection device;

a setting value module 204, configured to determine a setting value of the target protection device based on a level corresponding to the target protection device in combination with a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, where the setting value of the target protection device includes a fixed value current and a trip duration;

an adjusting module 205, configured to perform remote adjustment on the target protection device if it is determined that the setting value of the target protection device is changed from the set value.

Optionally, the grade module 203 is specifically configured to, in a process of determining a grade corresponding to the target protection device based on a capacity sharing principle and a transformer capacity corresponding to the target protection device:

if the target protection device is located on the main line, determining the grade of the main line corresponding to the target protection device based on the transformer capacity corresponding to the target protection device according to a capacity sharing principle; the dominant line rank comprises at most three levels;

Optionally, the setting value module 204 is specifically configured to, in a process of determining a setting value of the target protection device based on a grade corresponding to the target protection device and in combination with a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device:

Optionally, the setting value module 204 is specifically configured to, in a process of determining the setting value of the target protection device based on the setting value rule of the main line protection device and the setting value of the substation if the level corresponding to the target protection device is the main line level:

the first fixed value is greater than the second fixed value.

Optionally, the setting module 204 is specifically configured to, when it is determined that the first trip time duration is a first fixed value, determine a fixed value current and a trip time duration of the target protection device based on a main line first fixed value rule in the fixed value rules of the main line protection device and a main line class of the target protection device, in a process of:

if the target protection device belongs to the primary main line level, determining that the constant current of the target protection device is a first multiple of the rated current, and the tripping time length is a second tripping time length;

Optionally, the setting value module 204 is specifically configured to, in a process of determining the constant current and the trip time length of the target protection device based on the second main line constant value rule in the constant value rules of the main line protection device and the main line class of the target protection device, when it is determined that the first trip time length is the second constant value:

if the target protection device belongs to the mainline secondary, determining that the constant current of the target protection device is a fifth multiple of the rated current, and the trip time length is a sixth trip time length;

Optionally, the setting value module 204 is specifically configured to, in a process of determining a setting value of a target protection device based on a fixed value rule of the branch protection device and a transformer capacity corresponding to the target protection device, when determining that a level corresponding to the target protection device is a branch level:

determining a specific grade of a branch grade of the target protection device;

if the target protection device is at the level of a branch line, determining constant current corresponding to the capacity of all transformers between adjacent protection devices of the same branch line as the target protection device as standard current; the adjacent protection devices are the protection devices belonging to the branch line second level;

if the first tripping time length is a first fixed value, determining that the fixed value current of the target protection device is a seventh multiple of the standard current, wherein the tripping time length of the target protection device is the tripping time length of the first main line protection device minus a first preset value;

Specifically, the apparatus for adaptively adjusting protection of a power distribution network provided by the present invention can implement all the method steps implemented by the method embodiment and can achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

Fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device may include: a processor (processor) 310, a communication Interface (communication Interface) 320, a memory (memory) 330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. The processor 310 may invoke logic instructions in the memory 330 to perform a method of distribution network protection adaptive adjustment, the method comprising:

determining the number of the tower according to the main line and the branch line respectively based on the distance from the transformer substation;

re-determining the transformer capacity between any adjacent protection devices based on the number of the tower and the changed information, the capacity of the transformer corresponding to the target protection device is used; the protection devices are all positioned on the tower, and the target protection device is a protection device with a smaller number of the tower; the changed information comprises changed information of equipment and changed information of a line;

if the target protection device is located on a branch line, determining the branch line grade corresponding to the target protection device based on the transformer capacity corresponding to the target protection device according to a capacity sharing principle; the branch line levels include at most three levels.

if the first tripping time length is a second fixed value, determining the fixed value current and the tripping time length of the target protection device based on a main line second fixed value rule in the fixed value rules of the main line protection device and the main line grade of the target protection device;

the first constant value is greater than the second constant value.

if the target protection device belongs to the main line secondary level, determining that the constant current of the target protection device is a second multiple of the rated current, and the tripping time is a third tripping time;

Optionally, if the grade corresponding to the target protection device is a branch grade, determining a setting value of the target protection device based on a fixed value rule of the branch protection device and a transformer capacity corresponding to the target protection device includes:

determining a specific grade of a branch grade of the target protection device;

the first main line protection device is the protection device existing between the substation and the target protection device on the main line.

In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.

It should be noted that, the electronic device provided in the present invention can implement all the method steps implemented by the method embodiments and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiments in this embodiment are omitted here.

In another aspect, the present invention further provides a computer program product, where the computer program product includes a computer program, where the computer program may be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer is capable of executing the method for adaptive adjustment of power distribution network protection provided in the foregoing embodiments.

In still another aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the method for adaptive adjustment of power distribution network protection provided in the foregoing embodiments when executed by a processor.

The processor-readable storage medium may be any available media or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), solid State Disks (SSDs)), etc.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for self-adaptive adjustment of power distribution network protection is characterized by comprising the following steps:

based on the number of the tower and the changed information, re-determining the transformer capacity between any adjacent protection devices as the transformer capacity corresponding to the target protection device; the protection devices are all positioned on the tower, and the target protection device is a protection device with a smaller number of the tower; the changed information comprises changed information of equipment and changed information of a line;

determining a setting value of the target protection device based on the grade corresponding to the target protection device by combining a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, wherein the setting value of the target protection device comprises fixed value current and trip duration;

2. The method of adaptive adjustment for protection of a power distribution network according to claim 1, wherein the determining the grade corresponding to the target protection device based on a capacity sharing principle and the transformer capacity corresponding to the target protection device comprises:

3. The method of claim 1, wherein the determining the setting value of the target protection device based on the grade corresponding to the target protection device in combination with a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device comprises:

4. The method of claim 3, wherein if the level corresponding to the target protection device is a main line level, determining the setting value of the target protection device based on a setting value rule of the main line protection device and a setting value of a substation comprises:

the first fixed value is greater than the second fixed value.

5. The method according to claim 4, wherein if the first trip duration is a first fixed value, determining the fixed value current and the trip duration of the target protection device based on a main line first fixed value rule in the fixed value rules of the main line protection device and a main line class of the target protection device comprises:

6. The method according to claim 4, wherein if the first trip duration is a second fixed value, determining the fixed value current and the trip duration of the target protection device based on a main line second fixed value rule in the fixed value rules of the main line protection device and the main line class of the target protection device comprises:

7. The method for adaptively adjusting power distribution network protection according to claim 3, wherein if the class corresponding to the target protection device is a branch class, determining the setting value of the target protection device based on a setting value rule of the branch protection device and a transformer capacity corresponding to the target protection device comprises:

determining a specific grade of a branch grade of the target protection device;

8. An apparatus for adaptive adjustment of power distribution network protection, the apparatus comprising:

the setting value module is used for determining a setting value of the target protection device based on the grade corresponding to the target protection device by combining a fixed value rule of a main line protection device or a fixed value rule of a branch line protection device, wherein the setting value of the target protection device comprises a fixed value current and trip duration;

9. An electronic device comprising a memory, a transceiver, a processor;

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a computer to execute the method for adaptive adjustment of power distribution network protection according to any one of claims 1 to 7.