CN113471927A - Power distribution network self-adaptive setting method and system based on switch classification - Google Patents
Power distribution network self-adaptive setting method and system based on switch classification Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention provides a self-adaptive setting method and a self-adaptive setting system for a power distribution network based on switch classification, wherein the method comprises the following steps of: establishing a setting principle library according to the switch stage number; marking a switch with a protection function; acquiring switch information in a distribution network automation system, and judging whether a switch is shifted according to the switch information; if the switch is shifted, mapping the switch information corresponding to the shifted switch to the network topology; analyzing the network topology by taking a 10kV outgoing switch as a primary switch, traversing the network topology downwards, and reclassifying the switch with the protection function; automatically matching the setting principle in the setting principle library based on the result of switch reclassification; and (4) carrying out fixed value calculation according to a setting principle of good switch stage matching to generate new fixed value data. The method can avoid the complexity of setting the distribution network equipment, save time level difference, simultaneously give consideration to the selectivity and the rapidity of protection, and ensure the coordination among the protection of the multi-stage series power supply circuit.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a power distribution network self-adaptive setting method and system based on switch classification.
Background
With the rapid development of a power distribution network, the power supply conditions of multi-stage series connection are increasingly increased, if the multi-stage series connection is matched step by step according to a simple setting principle, the protection matching time can be prolonged unlimitedly, the protection is very unfavorable for rapidly removing faults, and the protection can not be matched frequently.
The current commonly used distribution network setting calculation method comprises the steps that the purpose of shortening the protection action time is achieved by setting a mismatch point, and if the mismatch point is improperly selected, the protection misoperation can be caused when a line fails, so that the power failure area is enlarged, and the power supply reliability is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, the invention aims to provide a power distribution network self-adaptive setting method based on switch classification, which can avoid complexity of setting of distribution network equipment, save time level difference, simultaneously give consideration to selectivity and rapidity of protection and ensure coordination among multi-stage series power supply line protection.
Therefore, the second purpose of the invention is to provide a power distribution network self-adaptive setting system based on switch classification.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a power distribution network adaptive tuning method based on switch classification, including the following steps: establishing a setting principle library according to the switch stage number; marking a switch with a protection function; acquiring switch information in a distribution network automation system, and judging whether a switch is shifted according to the switch information; if the switch is shifted, mapping the switch information corresponding to the shifted switch to the network topology; analyzing the network topology by taking a 10kV outgoing switch as a primary switch, traversing the network topology downwards, and reclassifying the switch with the protection function; automatically matching the setting principle in the setting principle library based on the result of switch reclassification; and (4) carrying out fixed value calculation according to a setting principle of good switch stage matching to generate new fixed value data.
In addition, the power distribution network self-adaptive setting method based on the switch classification according to the above embodiment of the present invention may further have the following additional technical features:
in some examples, the establishing a protection setting rule base according to a switching stage number specifically includes: and forming the setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
In some examples, the mapping the switch information corresponding to the index switch to the network topology includes: when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch; when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology; and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
In some examples, the analyzing the network topology with the 10kV outgoing switch as the first-stage switch, traversing the network topology downwards, and re-ranking the switches equipped with the protection function includes: and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
In some examples, the performing the fixed value calculation according to the setting principle that the switching stages are well matched includes: and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
According to the power distribution network self-adaptive setting method based on switch grading, switch deflection is obtained through a power distribution network automation system, topology change is automatically analyzed, switches with protection functions are graded by taking a transformer substation 10kV outgoing switch as a root node (primary node) on the basis of topology analysis, and setting principles of switches with different levels are automatically matched to perform self-adaptive calculation on a fixed value on the basis of a power distribution network setting rule base, so that setting is performed on the basis of switch grades on the basis of an on-line switch state and switch deflection, the complexity of setting of a power distribution network according to equipment is effectively avoided, time grade difference is saved, meanwhile, the selectivity and the rapidity of protection are considered, and cooperation among multi-level series power supply line protection is guaranteed.
In order to achieve the above object, an embodiment of the second aspect of the present invention provides a power distribution network adaptive tuning system based on switch classification, including: the establishing module is used for establishing a setting principle library according to the switch level; the marking module is used for marking the switch with the protection function; the judging module is used for acquiring switch information in the distribution network automation system and judging whether switch deflection exists or not according to the switch information; the mapping module is used for mapping the switch information corresponding to the deflection switch to the network topology when the switch is deflected; the grading module is used for analyzing the network topology by taking the 10kV outgoing switch as a primary switch, traversing the network topology downwards and grading the switch with the protection function again; the matching module is used for automatically matching the setting principle in the setting principle library based on the result of the switch reclassification; and the calculation module is used for performing fixed value calculation according to the setting principle of the well-matched switch stage number to generate new fixed value data.
In addition, the power distribution network adaptive setting system based on the switch classification according to the above embodiment of the present invention may further have the following additional technical features:
in some examples, the establishing module establishes a protection setting rule base according to a switching stage number, and specifically includes: and forming the setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
In some examples, the mapping module maps switch information corresponding to the indexed switches to a network topology, including: when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch; when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology; and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
In some examples, the grading module analyzes the network topology with the 10kV outgoing switch as a first-level switch, traverses the network topology downward, and reclassifies the switch equipped with the protection function, including: and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
In some examples, the calculation module performs fixed value calculation according to a setting principle that the switching stages are well matched, and the method includes: and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
According to the power distribution network self-adaptive setting system based on switch grading, switch deflection is obtained through the power distribution network automation system, topology change is automatically analyzed, on the basis of topology analysis, a transformer substation 10kV outgoing switch is taken as a root node (a first-level node), a switch with a protection function is graded, and on the basis of a power distribution network setting rule base, the setting principle of switches in different levels is automatically matched to perform self-adaptive calculation on a fixed value, so that on the basis of an online switch state, setting is performed on the basis of switch progression during switch deflection, the complexity of setting according to equipment of a power distribution network is effectively avoided, time step difference is saved, meanwhile, the selectivity and the rapidity of protection are considered, and cooperation among multi-level series power supply line protection is guaranteed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow diagram of a method for adaptive tuning of a distribution network based on switching hierarchy according to one embodiment of the present invention;
fig. 2 is a detailed flowchart of a power distribution network adaptive tuning method based on switch classification according to an embodiment of the present invention.
Fig. 3 is a block diagram of a power distribution network adaptive tuning system based on switch classification according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes a power distribution network adaptive setting method and system based on switch classification according to an embodiment of the invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for adaptively tuning a distribution network based on switching stages according to an embodiment of the present invention. As shown in fig. 1, the method for adaptively setting the distribution network based on the switch classification includes the following steps:
step S1: and establishing a setting principle library according to the switch stage number.
Specifically, the process of establishing the protection setting rule base according to the switch stage number specifically includes: and forming a setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
In a specific embodiment, a specific distribution network setting rule base is formed according to the switch stages; the setting rule base comprises setting principles corresponding to switches of different levels. According to experience, at most three stages of line configuration protection in distribution network adjustment are realized, so that the embodiment of the invention only considers the matching situation of three stages of protection switches.
Taking the phase current protection as an example:
1. time-limited quick-break protection:
(1) the first-stage protection switch configuration principle:
1) setting a recommended value according to the short-circuit current level by the first-stage protection, wherein the default value is as follows: 2700A;
2) the first-stage protection trip time is as follows by default: 0.15 s;
(2) second-stage protection switch configuration principle:
1) setting a recommended value according to the short-circuit current level by the second-stage protection, wherein the default value is as follows: 2400A;
2) the second-stage protection trip time is as follows by default: 0 s;
(3) third-level protection switch configuration principle:
1) setting a recommended value of a third-stage protection switch, wherein the default value is as follows: 1000A;
2) the trip time of the third-level protection switch is as follows by default: 0;
2. overcurrent protection:
(1) the first, second and third-level protection switch configuration principle is as follows:
1) setting according to the current of the load avoiding;
2) setting a primary CT rated value of 400A or less according to 1.2 times of the primary CT rated value;
3) setting a primary rated value of the CT of 600A or more according to a primary value of 720A;
4) setting according to a rated current value not greater than CT;
5) matching with the time-limited quick-break fixed value of the adjacent line;
6) the circuit is inversely matched with the timing limit over-current fixed value of the superior circuit;
(2) first-stage guard time constant:
1) the first-stage protection time is fixed, and the default value is as follows: 0.5 s;
2) the second-stage protection time is set, and the default values are as follows: 0.3 s;
3) the third-stage protection time is fixed, and the default values are as follows: 0.3 s;
3. an overload section:
(1) the first, second and third-level protection switch configuration principle is as follows:
1) setting according to 0.9 times of a fixed time limit overcurrent value in the protection;
2) the primary CT rated value is 600A or above, and the primary CT rated value is set according to a primary value 540A by considering a line current limiting value.
Step S2: the mark is provided with a switch with a protection function.
Step S3: and acquiring switch information in the distribution network automation system, and judging whether the switch is shifted according to the switch information.
Step S4: and if the switch is shifted, mapping the switch information corresponding to the shifted switch to the network topology.
Specifically, the process of mapping the switch information corresponding to the position-changing switch to the network topology includes: when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch; when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology; and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
Specifically, switches provided with protection are marked, the displacement condition of each switch can be obtained through a distribution network automation system, the topology of setting calculation is automatically updated according to the displacement of the switches, and the latest topology relation is generated.
For a switch with displacement, the matching relation topology of setting calculation needs to be updated again, and if the state of a certain switch with protection is changed from closed to open, the protection switch needs to be deleted in the topology of the setting calculation protection switch; similarly, if the state of a certain switch with protection is changed from on to off, the protection switch needs to be added in the setting calculation protection switch topology, and finally, the whole network setting calculation protection switch topology is updated according to the change condition of each switch obtained from the automation system.
Step S5: and analyzing the network topology by taking the 10kV outgoing switch as a primary switch, traversing the network topology downwards, and grading the switch with the protection function again.
Specifically, the process of analyzing the network topology by using the 10kV outgoing line switch as a first-level switch, traversing the network topology downwards, and re-grading the switch with the protection function includes: and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
Specifically, the 10kV outgoing switch of the transformer substation is used as a root node (primary node), the topology is traversed, and the switches with the protection function are classified. And traversing and setting the topology of the protective switch by taking the protective switch at which the 10kV outgoing line is positioned as a first-stage protective switch and taking the side lower than 10kV as the positive searching direction, wherein the next-stage protective switch is a second-stage protective switch, and similarly, the next-stage protective switch is a third-stage protective switch.
Step S6: and automatically matching the setting principle in the setting principle library based on the result of the switch reclassification.
Step S7: and (4) carrying out fixed value calculation according to a setting principle of good switch stage matching to generate new fixed value data.
Specifically, the process of performing fixed value calculation according to the setting principle of good switch stage matching includes: and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
Specifically, setting calculation is carried out on the setting value according to the switch grading result and based on a distribution network setting rule base and the setting principle of switches of different levels by automatically matching, so that the data of the setting value of each protection is obtained, and the setting calculation is finished.
Therefore, the power distribution network self-adaption setting method based on switch classification aims at the problems that the existing distribution network setting matching time is too long, the setting is prone to being mistaken and the like, a good processing method is provided for the self-adaption setting of the power distribution network, the problems existing in the distribution network can be effectively solved based on the method, a new thought is provided for the self-adaption setting of the distribution network, and the requirements of practical user application are met better.
In order to better understand the invention, the following describes an exemplary method for adjusting the power distribution network adaptively based on the switching stage, with reference to the accompanying drawings and specific embodiments.
In a specific embodiment, as shown in fig. 2, the method for adaptively setting the distribution network based on the switch classification includes the following steps:
step 1: and establishing a protection setting principle library according to the switch stage number.
Step 2: the mark is provided with a switch with a protection function.
And step 3: and acquiring switch information in the distribution network automation system, and analyzing whether switch deflection exists or not.
And 4, step 4: if the switch is shifted, jumping to step 5; otherwise, jump to step 9.
And 5: mapping the change switch information to the network topology.
Step 6: and (3) topology analysis, namely, traversing the topology downwards by taking the 10kV outgoing switch as a primary switch, and reclassifying the switch with the protection function.
And 7: and automatically matching the setting principle in the setting principle library based on the switch grading result.
And 8: and (4) carrying out fixed value calculation according to a setting principle of good switch stage matching to generate new fixed value data.
And step 9: and (6) ending.
According to the power distribution network self-adaptive setting method based on switch grading, switch deflection is obtained through a power distribution network automation system, topology change is automatically analyzed, switches with protection functions are graded by taking a transformer substation 10kV outgoing switch as a root node (primary node) on the basis of topology analysis, and setting principles of switches with different levels are automatically matched to perform self-adaptive calculation on a fixed value on the basis of a power distribution network setting rule base, so that setting is performed on the basis of switch grades on the basis of an on-line switch state and switch deflection, the complexity of setting of a power distribution network according to equipment is effectively avoided, time grade difference is saved, meanwhile, the selectivity and the rapidity of protection are considered, and cooperation among multi-level series power supply line protection is guaranteed.
The invention further provides a power distribution network self-adaptive setting system based on switch classification.
Fig. 3 is a block diagram of a power distribution network adaptive tuning system based on switch classification according to an embodiment of the invention. Referring to fig. 3, the adaptive tuning system 100 for a distribution network based on switch classification includes: a creation module 110, a labeling module 120, a determination module 130, a mapping module 140, a ranking module 150, a matching module 160, and a calculation module 170.
Specifically, the establishing module 110 is configured to establish a setting rule base according to the number of switching stages.
Specifically, the process of establishing the protection setting rule base according to the switching stage number by the establishing module 110 specifically includes: and forming a setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
In a specific embodiment, a specific distribution network setting rule base is formed according to the switch stages; the setting rule base comprises setting principles corresponding to switches of different levels. According to experience, at most three stages of line configuration protection in distribution network adjustment are realized, so that the embodiment of the invention only considers the matching situation of three stages of protection switches.
Taking the phase current protection as an example:
1. time-limited quick-break protection:
(1) the first-stage protection switch configuration principle:
1) setting a recommended value according to the short-circuit current level by the first-stage protection, wherein the default value is as follows: 2700A;
2) the first-stage protection trip time is as follows by default: 0.15 s;
(2) second-stage protection switch configuration principle:
1) setting a recommended value according to the short-circuit current level by the second-stage protection, wherein the default value is as follows: 2400A;
2) the second-stage protection trip time is as follows by default: 0 s;
(3) third-level protection switch configuration principle:
1) setting a recommended value of a third-stage protection switch, wherein the default value is as follows: 1000A;
2) the trip time of the third-level protection switch is as follows by default: 0;
2. overcurrent protection:
(1) the first, second and third-level protection switch configuration principle is as follows:
1) setting according to the current of the load avoiding;
2) setting a primary CT rated value of 400A or less according to 1.2 times of the primary CT rated value;
3) setting a primary rated value of the CT of 600A or more according to a primary value of 720A;
4) setting according to a rated current value not greater than CT;
5) matching with the time-limited quick-break fixed value of the adjacent line;
6) the circuit is inversely matched with the timing limit over-current fixed value of the superior circuit;
(2) first-stage guard time constant:
1) the first-stage protection time is fixed, and the default value is as follows: 0.5 s;
2) the second-stage protection time is set, and the default values are as follows: 0.3 s;
3) the third-stage protection time is fixed, and the default values are as follows: 0.3 s;
3. an overload section:
(1) the first, second and third-level protection switch configuration principle is as follows:
1) setting according to 0.9 times of a fixed time limit overcurrent value in the protection;
2) the primary CT rated value is 600A or above, and the primary CT rated value is set according to a primary value 540A by considering a line current limiting value.
The labeling module 120 is used to label the switches configured with the protection function.
The determining module 130 is configured to obtain switch information in the distribution automation system, and determine whether there is a switch shift according to the switch information.
The mapping module 140 is configured to map switch information corresponding to a switch with a shift to a network topology when the switch has a shift.
Specifically, the process of mapping the switch information corresponding to the position-changing switch to the network topology by the mapping module 140 includes: when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch; when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology; and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
Specifically, switches provided with protection are marked, the displacement condition of each switch can be obtained through a distribution network automation system, the topology of setting calculation is automatically updated according to the displacement of the switches, and the latest topology relation is generated.
For a switch with displacement, the matching relation topology of setting calculation needs to be updated again, and if the state of a certain switch with protection is changed from closed to open, the protection switch needs to be deleted in the topology of the setting calculation protection switch; similarly, if the state of a certain switch with protection is changed from on to off, the protection switch needs to be added in the setting calculation protection switch topology, and finally, the whole network setting calculation protection switch topology is updated according to the change condition of each switch obtained from the automation system.
The grading module 150 is configured to analyze the network topology by using the 10kV outgoing switch as a first-stage switch, traverse the network topology downward, and reclassify the switch equipped with the protection function.
Specifically, the process of analyzing the network topology by the classification module 150 using the 10kV outgoing switch as the first-level switch, traversing the network topology downwards, and re-classifying the switch with the protection function includes: and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
Specifically, the 10kV outgoing switch of the transformer substation is used as a root node (primary node), the topology is traversed, and the switches with the protection function are classified. And traversing and setting the topology of the protective switch by taking the protective switch at which the 10kV outgoing line is positioned as a first-stage protective switch and taking the side lower than 10kV as the positive searching direction, wherein the next-stage protective switch is a second-stage protective switch, and similarly, the next-stage protective switch is a third-stage protective switch.
The matching module 160 is configured to automatically match the tuning rules in the tuning rule base based on the result of the switch re-grading.
The calculation module 170 is configured to perform fixed value calculation according to the setting principle that the switching stage number is well matched, and generate new fixed value data.
Specifically, the process of calculating the fixed value by the calculating module 170 according to the setting principle that the switching stages are well matched includes: and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
Specifically, setting calculation is carried out on the setting value according to the switch grading result and based on a distribution network setting rule base and the setting principle of switches of different levels by automatically matching, so that the data of the setting value of each protection is obtained, and the setting calculation is finished.
Therefore, the power distribution network self-adaption setting system based on switch classification aims at the problems that the existing distribution network setting matching time is too long, the setting is prone to being mistaken and the like, a good processing scheme is provided for the self-adaption setting of the power distribution network, the problems existing in the distribution network can be effectively solved based on the scheme, a new thought is provided for the self-adaption setting of the distribution network, and the needs of practical user application are met better.
It should be noted that, a specific implementation manner of the power distribution network adaptive setting system based on the switch hierarchy in the embodiment of the present invention is similar to a specific implementation manner of the power distribution network adaptive setting method based on the switch hierarchy in the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not described here again in order to reduce redundancy.
According to the power distribution network self-adaptive setting system based on switch grading, switch deflection is obtained through the power distribution network automation system, topology change is automatically analyzed, on the basis of topology analysis, a transformer substation 10kV outgoing switch is taken as a root node (a first-level node), a switch with a protection function is graded, and on the basis of a power distribution network setting rule base, the setting principle of switches in different levels is automatically matched to perform self-adaptive calculation on a fixed value, so that on the basis of an online switch state, setting is performed on the basis of switch progression during switch deflection, the complexity of setting according to equipment of a power distribution network is effectively avoided, time step difference is saved, meanwhile, the selectivity and the rapidity of protection are considered, and cooperation among multi-level series power supply line protection is guaranteed.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A self-adaptive setting method of a power distribution network based on switch classification is characterized by comprising the following steps:
establishing a setting principle library according to the switch stage number;
marking a switch with a protection function;
acquiring switch information in a distribution network automation system, and judging whether a switch is shifted according to the switch information;
if the switch is shifted, mapping the switch information corresponding to the shifted switch to the network topology;
analyzing the network topology by taking a 10kV outgoing switch as a primary switch, traversing the network topology downwards, and reclassifying the switch with the protection function;
automatically matching the setting principle in the setting principle library based on the result of switch reclassification;
and (4) carrying out fixed value calculation according to a setting principle of good switch stage matching to generate new fixed value data.
2. The self-adaptive setting method for the distribution network based on the switch classification as claimed in claim 1, wherein the establishing of the protection setting rule base according to the switch classification specifically comprises:
and forming the setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
3. The method for self-adaptive tuning of the power distribution network based on the switch hierarchy of claim 1, wherein the mapping of the switch information corresponding to the position-changing switch to the network topology comprises:
when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch;
when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology;
and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
4. The switch classification-based power distribution network self-adaptive setting method of claim 1, wherein the 10kV outgoing switch is used as a primary switch to analyze the network topology, the network topology is traversed downwards, and the switch with the protection function is reclassified, and the method comprises the following steps:
and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
5. The self-adaptive setting method for the distribution network based on the switch classification as claimed in claim 1, wherein the setting principle well matched according to the switch classification is used for carrying out fixed value calculation, and the method comprises the following steps:
and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
6. The utility model provides a distribution network self-adaptation system of adjusting based on switch is hierarchical which characterized in that includes:
the establishing module is used for establishing a setting principle library according to the switch level;
the marking module is used for marking the switch with the protection function;
the judging module is used for acquiring switch information in the distribution network automation system and judging whether switch deflection exists or not according to the switch information;
the mapping module is used for mapping the switch information corresponding to the deflection switch to the network topology when the switch is deflected;
the grading module is used for analyzing the network topology by taking the 10kV outgoing switch as a primary switch, traversing the network topology downwards and grading the switch with the protection function again;
the matching module is used for automatically matching the setting principle in the setting principle library based on the result of the switch reclassification;
and the calculation module is used for performing fixed value calculation according to the setting principle of the well-matched switch stage number to generate new fixed value data.
7. The power distribution network self-adaptive setting system based on switch classification as claimed in claim 6, wherein the establishing module establishes a protection setting principle library according to switch stages, and specifically comprises:
and forming the setting rule base according to the switch stages, wherein the setting rule base comprises setting rules corresponding to switches of different stages.
8. The switch hierarchy-based power distribution network adaptive tuning system of claim 6, wherein the mapping module maps switch information corresponding to a position-changing switch to a network topology, and comprises:
when the switch state is changed from closed to open, deleting the protection switch in the topology of the setting calculation protection switch;
when the switch state is changed from on to off, the protection switch is added in the setting calculation protection switch topology;
and updating the network topology of the whole network setting calculation protection switch according to the displacement condition of each switch acquired from the automation system.
9. The power distribution network self-adaptive setting system based on switch classification of claim 1, wherein the classification module analyzes the network topology by using a 10kV outgoing switch as a primary switch, traverses the network topology downwards, and reclassifies the switch with the protection function, and comprises:
and taking the protection switch where the 10kV outgoing line is positioned as a first-stage protection switch, traversing and setting the calculation protection switch network topology by taking the side lower than 10kV as the positive searching direction, taking the next-stage protection switch as a second-stage protection switch, and so on, and taking the next-stage protection switch as a third-stage protection switch.
10. The power distribution network self-adaptive setting system based on switch classification as claimed in claim 6, wherein the calculation module performs constant value calculation according to the setting principle of good switch stage matching, and the method comprises the following steps:
and (4) carrying out setting calculation on the fixed value according to the result of reclassification of the switches and based on a setting rule base and automatically matching setting principles of the switches of different levels to obtain fixed value data of each protection switch.
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