CN112436490B

CN112436490B - Multi-bus interconnection self-identification method and device

Info

Publication number: CN112436490B
Application number: CN202011390151.4A
Authority: CN
Inventors: 孙娴; 宋小舟; 肖远清; 杨卉卉
Original assignee: Beijing Sifang Automation Co Ltd; Beijing Sifang Engineering Co Ltd
Current assignee: Beijing Sifang Automation Co Ltd; Beijing Sifang Engineering Co Ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2023-06-16
Anticipated expiration: 2040-12-01
Also published as: CN112436490A

Abstract

In the jurisdiction of a bus protection device, collecting bus disconnecting link opening and closing information of each node; synthesizing all bus space occupying binary numbers of all nodes according to the obtained disconnecting link switching information of the buses of the nodes, wherein each single node is associated with one all bus space occupying binary number; in the jurisdiction of the bus protection device, multiple bus transverse identifications are executed, wherein the primary bus transverse identification comprises multiple node longitudinal identifications. According to the method, bus interconnection analysis self-adaption under different main wiring and operation modes of the buses can be realized through software, bus faults can be guaranteed to occur under a complex interconnection mode of multi-bus wiring, a fault bus area can be correctly selected, and relay protection four-way requirements are met.

Description

Multi-bus interconnection self-identification method and device

Technical Field

The invention belongs to the field of relay protection of power systems, and relates to a self-identification method and device for multi-bus interconnection.

Background

The bus is an important component of the power system, and in order to ensure safe and stable operation of the power system, bus protection is important system equipment for ensuring safe and stable operation of a power grid, and has decisive significance for ensuring the safety of the power grid in the whole area. Therefore, it is necessary to provide a bus protection device with reliable operation and good performance, so that the bus protection device can rapidly detect the bus fault and timely and selectively cut off the fault.

The bus protection is based on kirchhoff current law, when more than two sections of buses are interconnected, the CT collection of the node on the bus can not completely represent the current flowing into and out of the bus, the current is split in practice, the split current proportion of the bus protection can not be determined, the kirchhoff current law is not met, and therefore the accuracy of differential current calculation is necessarily affected, and the reliability, the selectivity, the sensitivity and the rapidity of the bus protection action are affected.

Various interconnection conditions occur under the condition of multiple buses, the bus protection can be automatically identified, the bus protection can be ensured to rapidly detect a fault bus, and timely and selectively cut off faults is very necessary. The conventional knife switch wiring of the typical double-bus wiring is fixed, and only one interconnection operation mode of the double-span two buses is adopted, so that the interconnection mode is simple and convenient to judge, but the situation of judging the interconnection of the multiple buses is more in arrangement and combination, if the situation of checking the interconnection is more complex in the way of arranging and combination, the possibility of omission exists, and therefore, the invention solves the problem of self-identification of various interconnection modes under the situation of multiple bus sections, and provides reliable guarantee for the bus protection action selectivity.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide a multi-bus interconnection self-identification method and device, which are used for solving the problem of correct identification of fault buses when interconnection occurs under a complex main wiring, and are successfully applied to a bus protection device of the complex main wiring and also applied to a bus protection device of a simple main wiring.

The invention adopts the following technical scheme:

a method of self-identification of multi-bus interconnects, the method comprising the steps of:

step 1, collecting bus disconnecting link switching information of all nodes in a jurisdiction area of a bus protection device;

step 2, synthesizing the full bus space occupying binary number of each node according to the disconnecting link switching information of the different buses of the node obtained in the step 1,

wherein each single node is associated with a full bus space binary number;

and 3, in the jurisdiction area of the bus protection device, executing bus transverse identification, and judging whether the interconnection standard covers all bus segments or not so as to distinguish whether the bus segment identification is finished or not.

In the step 1, the node is an element combination which is in single-end connection relation or double-end connection relation with the bus, and the node comprises a branch combination, a bus connection combination and a cross strip;

wherein, the branch circuit combination is a single-end connection relationship comprising a breaker, a disconnecting link and CT,

the bus-tie combination is a double-end connection relation comprising a breaker, a disconnecting link and a CT, and is required to be disassembled into two single-end connection nodes, wherein the bus-tie combination is respectively provided with a single CT configuration type and a double CT configuration type, and the bus-tie combination of the single CT configuration type is disassembled into a single-end connection relation node with the CT configuration and a single-end connection relation node without the CT configuration; the bus of the double CT cross configuration is disassembled into two nodes with single-ended connection relation of single CT configuration, the two disassembled nodes respectively participate in respective interconnection discrimination logic,

the cross bar is a single-ended connection relation of CT-free configuration only comprising a disconnecting link, and CT is a current transformer.

In the step 2, the full bus space-occupying binary number records the space-occupying information of a single node on all buses in the jurisdiction of the bus protection device in a mode of arranging bits from low order to high order to form binary numbers, and each bit has 0 and 1 number.

In the step 3, the primary bus transverse identification includes P node longitudinal identifications, wherein P is greater than or equal to 2.

The step 3 comprises the following steps:

step 3-1, starting bus transverse identification in step 3, and locking an interconnection standard, wherein the interconnection standard refers to a bus segment to be identified whether to be interconnected or not and is used for distinguishing a bus segment which is not identified and a bus segment which is already identified;

step 3-2, according to the locking interconnection standard in the step 3-1, performing longitudinal node identification in the jurisdiction of the bus protection device;

step 3-3, according to the longitudinal identification of the node in step 3-2, judging whether the interconnection standard covers all bus segments, if so, terminating all the processes, and if not, turning to step 3-4;

and 3-4, comparing all current full bus space occupying binary numbers, removing the maximum full bus space occupying binary number at the interconnection standard, and updating the interconnection standard to serve as the interconnection standard for transverse recognition of the next bus in the step 3-1.

In the step 3-1, the first-wheel checking interconnection standard is all bus segments in the jurisdiction of the bus protection device, which indicates that all bus segments have not started interconnection identification; in order to avoid repeated detection, the interconnection standard in the next round of checking interconnection is that all bus segments in the jurisdiction of the bus protection device remove the bus segments with the detected interconnection.

The step 3-2 comprises the following steps:

step 3-2-1, comparing the current interconnection reference with the full bus space occupying binary numbers of the nodes, and screening out the full bus space occupying binary numbers of each node under the current interconnection reference;

step 3-2-2, extracting a maximum bus occupation information group with the maximum bus section number under the current interconnection standard;

step 3-2-3, selecting other nodes except the maximum bus space occupying node as current nodes, judging whether the current node full bus space occupying binary numbers under the rest interconnection references have the same bus segments compared with the maximum full bus space occupying binary numbers, if so, turning to step 3-2-4, otherwise, turning to step 3-2-6;

step 3-2-4, judging whether other bus segments different from the existing interconnection are newly added under the condition that the same bus segments exist, if so, turning to step 3-2-5, and if not, turning to step 3-2-6;

step 3-2-5, updating the maximum bus occupation information group under the current interconnection reference;

step 3-2-6, updating the full bus space occupying binary number of the current node;

step 3-2-7, judging whether all nodes in the jurisdiction area of the bus protection device are longitudinally identified, if so, turning to step 3-2-8, and if not, turning to step 3-2-3;

and 3-2-8, judging whether the maximum bus occupation information group under the current interconnection standard is newly increased, if so, turning to the step 3-2-3, and if not, finishing the longitudinal node identification, and turning to the step 3-3.

In the step 3-2-2, the maximum bus occupation information group comprises three pieces of information of the maximum bus segment number, the maximum bus occupation node and the maximum full bus occupation binary number;

when a single node is bridged over more than 2 bus sections simultaneously, the bridged multi-section buses become interconnection bus sections, the number of the bridged bus sections of all the nodes in the jurisdiction area of the bus protection device is calculated respectively, the maximum number is selected, the maximum value is the maximum number of the bus sections, the node with the maximum value is designated as the maximum bus space occupying node, and the bus space occupying binary number of the node is the maximum full bus space occupying binary number.

In the step 3, a group of maximum bus occupation information groups are transversely identified and extracted by the primary bus; determining the number of bus blocks in the jurisdiction area of the bus protection device according to the number of the maximum bus occupation information groups, and dividing the jurisdiction area of the bus protection device into a plurality of independent bus blocks according to the plurality of the maximum bus occupation information groups;

the independent bus blocks are divided into two cases of an interconnection block formed by a plurality of sections of buses and a non-interconnection block formed by a single section of bus, all bus blocks in the jurisdiction of the bus protection device are mutually independent, the largest full bus occupation binary numbers of the bus blocks are not overlapped with each other, and all bus sections in the jurisdiction of the bus protection device are covered after the bus blocks are overlapped.

The self-recognition device for multi-bus interconnection comprises a bus disconnecting link switching information collection module, a full bus space binary number synthesis module and a bus section recognition module,

the bus disconnecting link switching information collection module is used for collecting bus disconnecting link switching information of all nodes in a jurisdiction area of the bus protection device;

the full bus space occupying binary number synthesizing module synthesizes the full bus space occupying binary number of each node according to the obtained disconnecting link switching information of different buses where the nodes are located;

and the bus segment identification module is used for executing bus transverse identification in the jurisdiction area of the bus protection device, judging whether the interconnection standard covers all bus segments and distinguishing whether the bus segment identification is finished or not.

Compared with the prior art, the invention has the beneficial effects that:

the invention is suitable for various simple or complex main wirings, has high fault area identification accuracy, ensures the selectivity of bus protection actions, and well solves the technical problem of correct selection of fault areas in the process of interconnection under the complex main wirings.

Drawings

FIG. 1 is a general flow chart of a method for self-identification of multi-bus interconnects in accordance with the present invention;

FIG. 2 is a schematic diagram of a busbar transverse identification flow in the method of multi-busbar interconnection self-identification according to the present invention;

FIG. 3 is a schematic diagram of a longitudinal node identification flow of the method for self-identification of multi-bus interconnection in the present invention;

FIG. 4 is a schematic diagram of a complex primary wiring;

FIG. 5 is a schematic diagram of a typical dual bus wiring for a simple main wiring;

FIG. 6 is a schematic diagram of a specific workflow of a self-identification device for multi-bus interconnection.

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 in the embodiments of the present invention. The embodiments described herein are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the invention, based on the spirit of the invention.

Specific embodiments of the present invention will be described in further detail below with reference to the drawings.

Embodiment one:

FIG. 4 is a schematic diagram of a complex main wiring, M1-M6 are six sections of buses, L1-L3 are common branches, B1 is a bus bar, and T1 is a cross bar. L1 articulates M1 and M2, L2 articulates M1 and M4, L3 articulates M5 and M6, T1 articulates M1 and M3, B1 articulates M3 and M4 on the left side, and B1 articulates M5 on the right side. L1 to L3 correspond to 3 nodes, T1 corresponds to 1 node, the left side of B1 corresponds to 1 node, the right side of B1 corresponds to 1 node, and six nodes are total. The invention is applicable to a number of nodes equal to or greater than 2 without upper limit limitation and a number of bus-sections equal to or greater than 1 without upper limit limitation, and fig. 4 is only an example.

According to the general flow diagram of the invention of fig. 1, a method for self-identification of multi-bus interconnects comprises the following steps:

step 1, according to six sections of bus disconnecting link configured by six nodes, disconnecting link switching information of six nodes on six sections of bus in jurisdictions M1-M6 of the statistical bus protection device is opened;

node sequence number

Node abbreviation

M1

M2

M3

M4

M5

M6

1

L1

Closing device

Dividing into

2

L2

Closing device

Dividing into

Closing device

Dividing into

3

L3

Dividing into

Closing device

4

T1

Closing device

Dividing into

Closing device

Dividing into

5

B1-L (female coupling left side)

Dividing into

Closing device

Dividing into

6

B1-R (female tie right side)

Dividing into

Closing device

Dividing into

The jurisdiction of the bus protection device is the scope of bus protection, namely, the primary electric part between the current transformers for bus protection of all outgoing line breakers of each section of the bus, namely, all buses and all electric equipment connected to the buses.

The bus disconnecting link opening and closing information is that when two buses are bridged by the disconnecting link in the operation process of the disconnecting link, the device automatically recognizes that the single bus operates.

The full bus space occupying binary number is to record the space occupying information of a single node on all buses in the jurisdiction of the bus protection device by arranging bits from low order to high order to form binary number, and each bit has 0 and 1 number.

The nodes comprise branches, bus links and cross bars; the branch is a single node for configuring CT; when the bus-tie node detects interconnection, the bus-tie node side is indicated to be interconnected; the cross-stripe is a single node without a CT configuration,

wherein, CT is the current transformer.

Step 2, according to the disconnecting link switching information of six sections of buses of six nodes, the running condition of single nodes on each section of bus is displayed in a binary form, and each single node is associated with a full bus space occupying binary number;

node sequence number	Node abbreviation	Full bus space-occupying binary number
			1	L1	0b110000
2	L2	0b100100
			3	L3	0b000011
4	T1	0b101000
			5	B1-L	0b001100
6	B1-R	0b000010

Step 3, in the jurisdiction area of the bus protection device, performing the first bus transverse identification;

the primary bus transverse identification comprises P times of node longitudinal identification, the number P of nodes is more than or equal to 2, and no upper limit is adopted.

And transversely identifying the bus section by transversely carrying out identification operation.

And the longitudinal identification is to perform identification operation on the bus section longitudinally.

The interconnection standard refers to bus segments to be identified whether to be interconnected or not, and is used for distinguishing bus segments which are not identified and bus segments which are already identified, and the first-wheel checking interconnection standard is all bus segments in the jurisdiction of the bus protection device, and indicates that all bus segments are not yet interconnected and identified; in order to avoid repeated detection, the interconnection standard in the next round of checking interconnection is that all bus segments in the jurisdiction of the bus protection device remove the bus segments with the detected interconnection.

The maximum bus occupation information group comprises three information of the maximum bus segment number, the maximum bus occupation node and the maximum full bus occupation binary number.

The placeholder nodes are the connection points for the placeholders.

Step 3-1, locking an initial interconnection standard to be 0b111111;

step 3-2, executing longitudinal identification of six nodes in the jurisdiction of the bus protection device;

comparing the current interconnection reference 0b111111 with all bus space occupying binary numbers of six nodes respectively, and screening out all bus space occupying binary numbers of six nodes under the current interconnection reference 0b111111;

three data of the largest bus occupation information group under the current interconnection standard 0b111111 are extracted: and the maximum bus segment number is 2, the nodes with the maximum bus segment number of 2 are L1, L2, L3, T1 and B1-L respectively, and if the maximum bus space occupying node is selected to be L1, the full bus space occupying binary number with the maximum full bus space occupying binary number of L1 is 0B110000.

Nodes other than the maximum bus bar occupation node L1 execute the node longitudinal comparison again.

Selecting a node L2, judging whether the same bus segment exists between the L2 node full bus space binary number 0b100100 under the current interconnection reference 0b111111 and the maximum full bus space binary number 0b110000 under the current interconnection reference, wherein the same M1 bus segment exists at the moment, and the other bus segment M4 is newly added, and updating the three data of the maximum bus space information group under the current interconnection reference 0b 111111: the maximum bus segment number is 3, the maximum bus occupied node is L2, the maximum full bus occupied binary number is 0b110100, and the full bus occupied binary number of the L2 node is updated to 0b110100.

And selecting a node L3, and judging whether the same bus segment exists or not by comparing the L3 node full bus space binary number 0b000011 under the current interconnection reference 0b111111 with the maximum full bus space binary number 0b110100 under the current interconnection reference, and the same bus segment does not exist.

Selecting a node T1, judging whether the same bus segment exists between a T1 node full bus space binary number 0b101000 under the current interconnection reference 0b111111 and a maximum full bus space binary number 0b110100 under the current interconnection reference, wherein the same M1 bus segment exists at the moment, and the other bus segment M3 is newly added, and updating three data of the maximum bus space information set under the current interconnection reference 0b 111111: the maximum bus segment number is 4, the maximum bus occupied node is T1, the maximum full bus occupied binary number is 0b111100, and the full bus occupied binary number of the T1 node is updated to be 0b111100.

Node B1-L is selected, whether the same bus segment exists or not is judged according to the B1-L node full bus space binary number 0B001100 under the current interconnection reference 0B111111 and the maximum full bus space binary number 0B111100 under the current interconnection reference, at the moment, the same M3 bus segment and the same M4 bus segment exist, but no other bus segment is newly added, and then the full bus space binary number of the B1-L node is updated to 0B111100.

And selecting node B1-R, and judging whether the B1-R node full bus space binary number 0B000010 under the current interconnection reference 0B111111 is compared with the maximum full bus space binary number 0B111100 under the current interconnection reference to determine whether the same bus segment exists or not, and the same bus segment does not exist.

The results of the first busbar transverse recognition are shown in the following table, wherein M1, M2, M3 and M4 are interconnected, the maximum busbar section number is 4, the maximum full busbar occupation binary number is 0b111100, and the recognition of the first independent interconnected block is completed:

the interconnection standard 0b111111 of the first bus bar transverse identification eliminates the interconnection buses M1 to M4 (0 b 111100) of the first independent interconnection block, so as to obtain the interconnection standard 0b000011 of the second bus bar transverse identification, namely, M5 and M6, and further needs to confirm whether interconnection is performed.

Step 3, in the jurisdiction area of the bus protection device, performing the second bus transverse identification;

the result of the second bus horizontal recognition is shown in the following table, M5 and M6 are interconnected, the maximum bus segment number is 2, the maximum full bus occupying binary number is 0b000011, and the recognition of the second independent interconnection block is completed:

the interconnection standard 0b000011 of the second bus transverse identification removes interconnection buses M5 and M6 (0 b 000011) of the second interconnection block, the interconnection standard is 0b000000, whether the bus-free section needs to be interconnected or not is described, namely the identification of all six sections of buses in the jurisdiction of the bus protection device is completed, all process judgment is terminated, and the bus transverse identification is performed twice in total.

The bus protection device is divided into two independent bus blocks by two largest bus occupation information groups in the jurisdiction, wherein the first independent bus block is a block formed by interconnecting four sections of buses M1-M4, and the second independent bus block is a block formed by interconnecting two sections of buses M5 and M6. There is no interconnection between the two independent bus blocks. The maximum full bus-bar occupying binary number 0b111100 of the first block and the maximum full bus-bar occupying binary number 0b000011 of the second block are not overlapped, and all six bus segments in the jurisdiction of the bus protection device are covered after accumulation.

Embodiment two:

fig. 5 is a schematic diagram of a typical dual bus connection of a simple main connection, M1 and M2 are two sections of buses, L1 and L2 are common branches, and B1 is a bus bar. L1 articulates M1 and M2. L1 and L2 correspond to 2 nodes, the left side of B1 corresponds to 1 node, the right side of B1 corresponds to 1 node, and total four nodes are obtained. The invention is applicable to a number of nodes greater than or equal to 2 without upper limit limitation, a number of bus-sections greater than or equal to 1 without upper limit limitation, and fig. 5 is only an example.

step 1, according to two sections of bus disconnecting link configured by four nodes, disconnecting link switching information of four nodes on two sections of buses in jurisdictions M1 and M2 of the statistical bus protection device is opened;

node sequence number	Node abbreviation	M1	M2
				1	L1	Closing device	Closing device
2	L2	Dividing into	Closing device
				3	B1-L (female coupling left side)	Closing device	Dividing into
4	B1-R (female tie right side)	Dividing into	Closing device

Step 2, according to the disconnecting link switching information of two sections of buses of four nodes, the running condition of single nodes on each section of bus is displayed in a binary form, and each single node is associated with a full bus space occupying binary number;

step 3-1, locking an initial interconnection standard to be 0b11;

step 3-2, executing longitudinal identification of four nodes in the jurisdiction of the bus protection device;

comparing the current interconnection reference 0b11 with all-bus space-occupying binary numbers of four nodes respectively, and screening out all-bus space-occupying binary numbers of the four nodes under the current interconnection reference 0b11;

three data of the largest bus occupation information group under the current interconnection standard 0b11 are extracted: the maximum bus segment number is 2, the maximum bus occupying node is L1, and the maximum full bus occupying binary number is 0b11.

Selecting a node L2, judging whether the L2 node full bus space binary number 0b01 under the current interconnection reference 0b11 is compared with the maximum full bus space binary number 0b11 under the current interconnection reference to determine whether the same bus segment exists, wherein the same M1 bus segment exists at the moment, but no other bus segments are newly added, and if the data of the three data of the maximum bus space information group under the current interconnection reference 0b11 is kept unchanged, the full bus space binary number of the L2 node is updated to be 0b11.

And selecting node B1-L, judging whether the B1-L node full bus space binary number 0B10 under the current interconnection reference 0B11 is compared with the maximum full bus space binary number 0B11 under the current interconnection reference to determine whether the same bus segment exists, wherein the same M1 bus segment exists at the moment, but no other bus segments are newly added, and if the three data of the maximum bus space information group under the current interconnection reference 0B11 are kept unchanged, updating the full bus space binary number of the B1-L node to 0B11.

And selecting node B1-R, judging whether the B1-R node full bus space binary number 0B01 under the current interconnection reference 0B11 is compared with the maximum full bus space binary number 0B11 under the current interconnection reference to determine whether the same bus segment exists, wherein the same M2 bus segment exists at the moment, but no other bus segments are newly added, and if the three data of the maximum bus space information group under the current interconnection reference 0B11 are kept unchanged, updating the full bus space binary number of the B1-R node to 0B11.

The results of the first bus transverse recognition are shown in the following table, wherein M1 and M2 are interconnected, the maximum bus section number is 2, the maximum full bus occupying binary number is 0b11, and the recognition of the first independent interconnection block is completed:

the interconnection standard 0b11 of the first bus transverse identification removes interconnection buses M1 and M2 (0 b 11) of the first independent interconnection block, the interconnection standard is 0b00, no bus section needs to judge whether interconnection is needed, namely, the identification of all two sections of buses in the jurisdiction of the bus protection device is finished, all process judgment is terminated, and the bus transverse identification is summed up.

Only one maximum bus occupation information group and only one independent bus block in the bus protection device jurisdiction cover all two sections of bus sections in the bus protection device jurisdiction.

Taking the first embodiment and the second embodiment as examples, the technical scheme of the device for realizing the multi-bus interconnection self-identification method is as follows:

the execution instruction realizes the protection device of all steps in the technical scheme of the multi-bus interconnection self-identification method, identifies a plurality of independent bus blocks, identifies the independent bus block where the fault is located, and selectively breaks out the fault bus isolation fault.

The application also discloses a self-identification device based on the multi-bus interconnection, and a specific workflow is shown in fig. 6.

Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims

1. A method of self-identification of a multi-bus interconnect, the method comprising the steps of:

step 1, collecting bus disconnecting link switching information of all nodes including bus-bar combination, branch-circuit combination and cross-bar in a jurisdiction area of a bus protection device;

wherein each single node is associated with a full bus space binary number;

step 3, in the jurisdiction area of the bus protection device, performing bus transverse identification, and judging whether the interconnection standard covers all bus segments or not so as to distinguish whether the bus segment identification is finished or not;

2. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

3. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

4. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

5. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

6. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

the step 3-2 comprises the following steps:

7. A method for self-identification of a multi-bus interconnect according to claim 6, wherein,

8. A method for self-identification of a multi-bus interconnect according to claim 1, wherein,

9. A multi-bus interconnection self-identification device using the method of any one of claims 1-8, comprising a bus disconnecting link switching information collection module, a full bus space binary number synthesis module and a bus segment identification module, wherein,

the bus disconnecting link switching information collection module collects bus disconnecting link switching information of all nodes including bus-tie combinations, branch combinations and cross bars in the jurisdiction area of the bus protection device;