CN114142448A - Power distribution network protection method and device and storage medium - Google Patents
Power distribution network protection method and device and storage medium Download PDFInfo
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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
- H02H7/28—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 for meshed systems
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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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Abstract
The invention discloses a method, a device and a storage medium for protecting a power distribution network, wherein the method comprises the following steps: determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2; constructing a criterion action condition analysis model according to the confidence interval of the protection criterion; and protecting the power distribution network according to the criterion action condition analysis model. By the technical scheme, a multi-criterion fusion power distribution network protection method can be constructed, and power distribution network protection can be carried out comprehensively, accurately and efficiently.
Description
Technical Field
The embodiment of the invention relates to the technical field of power distribution networks, in particular to a power distribution network protection method, a power distribution network protection device and a storage medium.
Background
With the development of distributed power sources and high-proportion new energy, the energy flow of a power distribution network is changed from traditional unidirectional flow to bidirectional flow, and the network topology is more complicated while the performance of the power distribution network is improved, so that the protection method of the power distribution network is currently important research content.
The existing power distribution network protection method mainly adopts three-section current protection as a criterion and adopts a single criterion to carry out fault protection decision. And in the nodes after partial upgrading and reconstruction, the power distribution network protection decision is realized by adopting directional current protection, distance protection or differential protection, different criteria are realized by adopting a main backup mode in a matching way, but the protection criteria operate independently, fault judgment is generated independently, and the reliability of a power distribution network protection system is reduced.
Disclosure of Invention
The invention provides a power distribution network protection method, a power distribution network protection device and a storage medium, and constructs a multi-criterion fusion power distribution network protection method for comprehensively, accurately and efficiently protecting a power distribution network.
In a first aspect, an embodiment of the present invention provides a method for protecting a power distribution network, where the method includes:
determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2;
constructing a criterion action condition analysis model according to the confidence interval of the protection criterion;
and protecting the power distribution network according to the criterion action condition analysis model.
Optionally, the protection criterion includes at least two of a distance protection criterion, a direction protection criterion, an overcurrent protection criterion, and a differential protection criterion.
Optionally, if the protection criterion includes a distance protection criterion, a confidence interval of the distance protection criterion
Wherein the content of the first and second substances,
Zcalcfor calculating impedance, Z, from voltage and current measurements of the linesetThe action impedance setting value is the action impedance setting value of the distance protection criterion.
Optionally, if the protection criterion includes a direction protection criterion, a confidence interval of the direction protection criterion
Wherein the voltage measurement value of the bus is measured
And current measurement
Angle therebetween
arg (-) denotes the angle between the calculation vectors, the power factor of the distribution network line is between 0 and θ.
Optionally, if the protection criterion includes an overcurrent protection and differential protection criterion, a confidence interval of the overcurrent protection and differential protection criterion
Wherein the magnitude of the overcurrent or the magnitude of the unbalance current reflects the fault condition
K. p is constant and rated current
I is the line current at the measurement location, IpickupThe starting current setting value of the measuring position is obtained.
Optionally, if the number of the protection criteria is 2, the criterion action condition analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signal for protection criterion 2, x number of confidence intervals for protection criterion 1, P1iIndicating the confidence of the ith protection criterion 1Interval, y is the number of confidence intervals for the protection criterion 2, P2jThe confidence interval of the jth protection criterion 2 is shown, i is 1,2, …, x, j is 1,2, …, y.
Optionally, if the number of the protection criteria is 3, the criterion action condition analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signals for protection criterion 2, S3Decision signal for protection criterion 3, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jRepresenting the confidence interval of the jth protection criterion 2, z being the number of confidence intervals of the protection criterion 3, P3kThe confidence interval of the kth protection criterion 3 is represented, i is 1,2, …, x, j is 1,2, …, y, k is 1,2, …, z.
In a second aspect, an embodiment of the present invention further provides a power distribution network protection device, where the device includes: the device comprises a determining module, a processing module and a protecting module; the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining protection criteria and confidence intervals of the protection criteria, and the number of the protection criteria is an integer which is greater than or equal to 2; the processing module is used for constructing a criterion action condition analysis model according to the confidence interval of the protection criterion; and the protection module is used for protecting the power distribution network according to the criterion action condition analysis model.
In a third aspect, an embodiment of the present invention further provides a power distribution network protection apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor is configured to implement the power distribution network protection method according to any one of the embodiments of the present invention when the computer program is executed.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the power distribution network protection method according to any one of the embodiments of the present invention.
The method comprises the steps of determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2; constructing a criterion action condition analysis model according to the confidence interval of the protection criterion; and protecting the power distribution network according to the criterion action condition analysis model. The problem of low performance of a power distribution network protection system caused by independent operation and independent fault judgment among protection criteria in the prior art is solved, a power distribution network protection method with multiple criteria fused can be constructed, and power distribution network protection is carried out comprehensively, accurately and efficiently.
Drawings
Fig. 1 is a schematic flow chart of a power distribution network protection method according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a power distribution network protection method according to a first embodiment of the present invention;
fig. 3 is a schematic flow chart of another power distribution network protection method according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power distribution network protection device according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power distribution network protection device in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flow diagram of a power distribution network protection method according to an embodiment of the present invention, where this embodiment is applicable to a situation of power distribution network fault location and protection isolation, and the method may be executed by a power distribution network protection device according to an embodiment of the present invention, where the device may be implemented in a software and/or hardware manner, as shown in fig. 1, the method specifically includes the following steps:
s101, determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2.
The confidence interval is an interval of the error range of the estimated population average value, and specifically, the interval contains the credibility of the result of the population average value. Specifically, the protection criterion comprises at least two of a distance protection criterion, a direction protection criterion, an overcurrent protection criterion and a differential protection criterion; the confidence interval of the protection criterion is the interval of failure of the protection criterion obtained by calculation.
And S102, constructing a criterion action condition analysis model according to the confidence interval of the protection criterion.
Each protection criterion has a corresponding confidence interval, the confidence intervals of the protection criteria are different, and the confidence intervals of the protection criteria can be calculated by using the setting values of the criteria; and the comprehensive judgment of the protection criterion can be carried out by combining confidence intervals of different protection criteria, and a criterion action condition analysis model is constructed.
Specifically, the protection criterion includes a distance protection criterion, a direction protection criterion, an overcurrent protection criterion and a differential protection criterion, wherein the calculation methods of the overcurrent protection criterion and the differential protection criterion are consistent.
Optionally, when the protection criterion is a distance protection criterion, the calculation mode of the confidence interval is as shown in formula (1):
wherein the content of the first and second substances,
Zcalcfor calculating impedance, Z, from voltage and current measurements of the linesetThe action impedance setting value is the action impedance setting value of the distance protection criterion.
Specifically, when the calculated impedance is outside the action region of the distance protection, the confidence interval P of the protection criterion is 0, the confidence interval becomes non-0 as the calculated impedance enters the setting range, and the confidence interval is 0.5 to 1 according to the deviation degree ratio of the calculated impedance and the setting impedance value.
Optionally, when the protection criterion is a directional protection criterion, the calculation mode of the confidence interval is as shown in formula (2):
wherein the voltage measurement value of the bus is measured
And current measurement
Angle therebetween
arg (-) denotes the angle between the calculation vectors, the power factor of the distribution network line is between 0 and θ.
Specifically, under normal conditions, the power factor of the power distribution network line is between 0 and theta; in case of overload, the power distribution network line power factor can be as high as
Power factor approach
The confidence interval of the direction protection criterion can be calculated through a formula (2); when the phase angle is greater than
When the power distribution network is faultless, the confidence interval P is not 0, and when the power distribution network is faultless, the confidence interval P is 0; when the angle is
The confidence interval is 0.5, and the confidence interval varies with increasing angle.
Optionally, when the protection criterion is an overcurrent protection criterion and a differential protection criterion, the calculation mode of the confidence interval is as shown in formula (3):
wherein the magnitude of the overcurrent or the magnitude of the unbalance current reflects the fault condition
K. p is constant and rated current
I is the line current at the measurement location, IpickupThe starting current setting value of the measuring position is obtained.
Specifically, if the line current I obtained from the measurement location is smaller than the starting current, the confidence interval P is 0. If the current is greater than the startup value, the confidence band is not 0 and increases as the overcurrent condition and the unbalanced current condition increase.
Optionally, after obtaining the confidence interval of each protection criterion, the confidence interval of each protection criterion may be processed to construct a criterion action condition analysis model.
The number of the protection criteria at least includes 2, specifically, the number of the protection criteria may be 2, 3, 4, and the like, which is not limited in the embodiment of the present invention.
Optionally, if the number of the protection criteria is 2, the method for constructing the criterion action condition analysis model is shown in formula (4):
wherein S is1Decision signals for protection criterion 1, S2Decision signal for protection criterion 2, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jThe confidence interval of the jth protection criterion 2 is shown, i is 1,2, …, x, j is 1,2, …, y.
The protection criterion 1 can be any one of a distance protection criterion, a direction protection criterion, an overcurrent protection criterion and a differential protection criterion, and the protection criterion 2 is any one of the distance protection criterion, the direction protection criterion, the overcurrent protection criterion and the differential protection criterion except the protection criterion 1. Specifically, fig. 2 is a schematic diagram of an architecture of a power distribution network protection method in the first embodiment of the present invention, and as can be seen from fig. 2, the architecture of the power distribution network protection method includes a plurality of protection criterion units, each criterion unit includes a plurality of protection criteria, data determination results of the protection criteria can be used interactively, the number of confidence intervals of the protection criteria 1 is the number of the protection criteria 1 included in the power distribution network, the number of confidence intervals of the protection criteria 2 is the number of the protection criteria 2 included in the power distribution network, and so on.
Optionally, multi-criterion fusion verification may be performed on the action result of the criterion to eliminate an erroneous criterion and identify a correct criterion.
Specifically, S is a decision signal from a specific criterion, and the subscripts represent different categories of criteria, such as distance protection criteria, direction protection criteria, overcurrent protection criteria, differential protection criteria, and the like. The assignment of the S value depends on the judgment result of the criterion itself, for example, S-1 indicates that the criterion is operated, and S-0 indicates that the criterion is not operated.
Specifically, when the S value is 1 and the confidence intervals P1, P2, and P3 are 0, the value of the second term of the expression is-1, the value of the first term of the expression is 1, and the criterion action condition analysis model F is a negative value. At this time, the judgment can be determined as the false operation of the criterion; when the S value is 0, the confidence interval is between 0.5 and 1, the second term of the expression is a positive number, the first term of the expression is a negative number, the criterion action condition analysis model F is a negative number, and the criterion action condition analysis model F can be determined to be the criterion refusal; when the S value is 1 and the confidence intervals P1, P2, and P3 are not 0, the criterion behavior analysis model F is a positive value, and at this time, it is determined that the criterion is correctly operated. The multi-criterion fusion verification can be carried out on the action result of the criterion, the criterion of the refusal action and the false action is eliminated, the correct criterion is reserved, and the accuracy of the fault judgment of the system is improved.
Optionally, if the number of the protection criteria is 3, the method for constructing the criterion action condition analysis model is shown in formula (5):
wherein S is1Decision signals for protection criterion 1, S2Decision signals for protection criterion 2, S3Decision signal for protection criterion 3, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jRepresenting the confidence interval of the jth protection criterion 2, z being the number of confidence intervals of the protection criterion 3, P3kThe confidence interval of the kth protection criterion 3 is represented, i is 1,2, …, x, j is 1,2, …, y, k is 1,2, …, z.
Specifically, the protection criterion 1 may be any one of a distance protection criterion, a direction protection criterion, an overcurrent protection criterion and a differential protection criterion, the protection criterion 2 is any one of the distance protection criterion, the direction protection criterion, the overcurrent protection criterion and the differential protection criterion except for the protection criterion 1, and the protection criterion 3 is any one of the distance protection criterion, the direction protection criterion, the overcurrent protection criterion and the differential protection criterion except for the protection criterion 1 and the protection criterion 2. The number of the confidence intervals of the protection criteria 1 is the number of the protection criteria 1 contained in the power distribution network, the number of the confidence intervals of the protection criteria 2 is the number of the protection criteria 2 contained in the power distribution network, and the number of the confidence intervals of the protection criteria 3 is the number of the protection criteria 3 contained in the power distribution network.
S103, protecting the power distribution network according to the criterion action condition analysis model.
The protection of the power distribution network is realized by verifying a criterion result, eliminating the criterion of refusal action and misoperation, and forming a trip scheme to isolate faults.
Specifically, fig. 3 is a schematic flow chart of another power distribution network protection method according to a first embodiment of the present invention, and as can be seen from fig. 3, the method specifically includes the following steps:
s301, data acquisition and analysis.
Specifically, the data acquisition and analysis mainly completes the information acquisition and analysis of the electrical analog quantity and the switching value.
S302, setting a confidence interval of the protection criterion.
Specifically, the protection criterion confidence interval setting is mainly that analyzed information of the electrical analog quantity and the switching value is processed by multiple criteria and then uploaded to evaluate the protection criterion, and the protection criterion with complete sampling input conditions is activated; the multi-criterion protection evaluation unit gives confidence intervals of faults according to different protection criteria, makes a comprehensive fault decision and finally uploads processed fault judgment result information to the fault positioning unit; after the fault positioning unit receives the data information, the decision information is fed back to the primary system through the communication system for protection action
S303, judging the fault of multi-criterion fusion.
Specifically, the fault judgment of the multi-criterion fusion is to give out a confidence interval of the fault according to different protection criteria to make comprehensive fault judgment.
And S304, fault positioning and tripping.
Specifically, fault location and tripping are to determine and locate the position of a fault according to the fault and perform fault isolation to achieve the purpose of power distribution network protection.
In the embodiment of the invention, a multi-criterion fusion protection method can be designed according to the difference condition of sampling conditions, the fault judgment advantages of all the criteria are played, the application defects of all the criteria are made up, and the effects of power distribution network protection and fault identification are played to the maximum extent.
The embodiment of the invention provides a power distribution network protection method, which comprises the following steps: determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2; constructing a criterion action condition analysis model according to the confidence interval of the protection criterion; and protecting the power distribution network according to the criterion action condition analysis model. The problem of low performance of a power distribution network protection system caused by independent operation and independent fault judgment among protection criteria in the prior art is solved, a power distribution network protection method with multiple criteria fused can be constructed, and power distribution network protection is carried out comprehensively, accurately and efficiently.
Example two
The power distribution network protection device provided by the second embodiment of the invention can execute the power distribution network protection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 4 is a schematic structural diagram of a power distribution network protection device provided in the second embodiment, as shown in fig. 4, including: a determination module 401, a processing module 402 and a protection module 403.
A determining module 401, configured to determine protection criteria and confidence intervals of the protection criteria, where the number of protection criteria is an integer greater than or equal to 2.
And the processing module 402 is configured to construct a criterion action condition analysis model according to the confidence interval of the protection criterion.
And the protection module 403 is configured to protect the power distribution network according to the criterion action condition analysis model.
The power distribution network protection device provided by this embodiment is a power distribution network protection method implemented in the above embodiments, and the implementation principle and technical effect of the power distribution network protection device provided by this embodiment are similar to those of the above embodiments, and are not described here again.
Optionally, the protection criterion includes at least two of a distance protection criterion, a direction protection criterion, an overcurrent protection criterion, and a differential protection criterion.
Optionally, if the protection criterion includes a distance protection criterion, a confidence interval of the distance protection criterion
Wherein the content of the first and second substances,
Zcalcfor calculating impedance, Z, from voltage and current measurements of the linesetThe action impedance setting value is the action impedance setting value of the distance protection criterion.
OptionalIf the protection criterion includes a direction protection criterion, a confidence interval of the direction protection criterion
Wherein the voltage measurement value of the bus is measured
And current measurement
Angle therebetween
arg (-) denotes the angle between the calculation vectors, the power factor of the distribution network line is between 0 and θ.
Optionally, if the protection criterion includes an overcurrent protection and differential protection criterion, a confidence interval of the overcurrent protection and differential protection criterion
Wherein the magnitude of the overcurrent or the magnitude of the unbalance current reflects the fault condition
K. p is constant and rated current
I is the line current at the measurement location, IpickupThe starting current setting value of the measuring position is obtained.
Optionally, if the number of the protection criteria is 2, the criterion action condition analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signal for protection criterion 2, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jRepresenting the jth protection criterion 2Confidence interval, i ═ 1,2, …, x, j ═ 1,2, …, y.
Optionally, if the number of the protection criteria is 2, the criterion action condition analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signal for protection criterion 2, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jThe confidence interval of the jth protection criterion 2 is shown, i is 1,2, …, x, j is 1,2, …, y.
EXAMPLE III
Fig. 5 is a schematic structural diagram of a power distribution network protection device in a third embodiment of the present invention. Fig. 5 illustrates a block diagram of an exemplary power distribution network protection device 12 suitable for use in implementing embodiments of the present invention. The power distribution network protection device 12 shown in fig. 5 is only an example, and should not bring any limitation to the function and the scope of the application of the embodiment of the present invention.
As shown in fig. 5, the distribution network protection device 12 is in the form of a general purpose computing device. The components of the power distribution network protection device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The power distribution network protection device 12 typically includes a variety of computer system readable media. These media may be any available media that can be accessed by the distribution network protection device 12 and include both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. The power distribution network protection device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, and commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The distribution network protection appliance 12 may also communicate with one or more external devices 14 (e.g., a keyboard, a pointing device, a display 24, etc.), with one or more devices that enable a user to interact with the distribution network protection appliance 12, and/or with any devices (e.g., a network card, a modem, etc.) that enable the distribution network protection appliance 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. In the distribution network protection device 12 of the present embodiment, the display 24 is not provided as a separate body, but is embedded in a mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. Also, the distribution network protection device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 20. As shown in fig. 5, the network adapter 20 communicates with other modules of the power distribution network protection device 12 via the bus 18. It should be appreciated that although not shown in fig. 5, other hardware and/or software modules may be used in conjunction with the distribution network protection device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing by running a program stored in the system memory 28, for example, to implement the power distribution network protection method provided by the embodiment of the present invention, the method includes:
determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2;
constructing a criterion action condition analysis model according to the confidence interval of the protection criterion;
and protecting the power distribution network according to the criterion action condition analysis model.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a power distribution network protection method according to any embodiment of the present invention, where the method includes:
determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2;
constructing a criterion action condition analysis model according to the confidence interval of the protection criterion;
and protecting the power distribution network according to the criterion action condition analysis model.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power distribution network protection method is characterized by comprising the following steps:
determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2;
constructing a criterion action condition analysis model according to the confidence interval of the protection criterion;
and protecting the power distribution network according to the criterion action condition analysis model.
2. The method of claim 1, wherein the protection criteria comprise at least two of a distance protection criterion, a direction protection criterion, an over-current protection criterion, and a differential protection criterion.
3. The method of claim 2, wherein if the protection criteria comprises a distance protection criterion, a confidence interval for the distance protection criterion
Wherein the content of the first and second substances,
Zcalcfor calculating impedance, Z, from voltage and current measurements of the linesetAnd setting the action impedance of the distance protection criterion.
4. The method of claim 2, wherein if the protection criteria comprises a directional protection criterion, a confidence interval for the directional protection criterion
Wherein the voltage measurement value of the bus is measured
And current measurement
Angle therebetween
arg (-) denotes the angle between the calculation vectors, the power factor of the distribution network line is between 0 and θ.
5. The method of claim 2, wherein the over-current protection and differential protection criteria are determined if the protection criteria include the over-current protection and differential protection criteria, and a confidence interval for the over-current protection and differential protection criteria
Wherein the magnitude of the overcurrent or the magnitude of the unbalance current reflects the fault condition
K. p is constant and rated current
I is the line current at the measurement location, IpickupAnd setting a starting current value of the measuring position.
6. The method of claim 1, wherein if the number of protection criteria is 2, the criteria behavior analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signal for protection criterion 2, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jThe confidence interval of the jth protection criterion 2 is shown, i is 1,2, …, x, j is 1,2, …, y.
7. The method of claim 1, wherein if the number of protection criteria is 3, the criteria behavior analysis model is
Wherein S is1Decision signals for protection criterion 1, S2Decision signals for protection criterion 2, S3Decision signal for protection criterion 3, x number of confidence intervals for protection criterion 1, P1iRepresenting the confidence interval of the ith protection criterion 1, y being the number of confidence intervals of the protection criterion 2, P2jRepresenting the confidence interval of the jth protection criterion 2, z being the number of confidence intervals of the protection criterion 3, P3kThe confidence interval of the kth protection criterion 3 is represented, i is 1,2, …, x, j is 1,2, …, y, k is 1,2, …, z.
8. A protection device for a power distribution network, comprising: the device comprises a determining module, a processing module and a protecting module;
the determining module is used for determining protection criteria and confidence intervals of the protection criteria, wherein the number of the protection criteria is an integer greater than or equal to 2;
the processing module is used for constructing a criterion action condition analysis model according to the confidence interval of the protection criterion;
and the protection module is used for protecting the power distribution network according to the criterion action condition analysis model.
9. A protection device for a power distribution network, comprising: memory, processor and computer program stored on the memory and executable on the processor for implementing a method for protection of a power distribution network according to any of claims 1-7 when the computer program is executed.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out a method for protecting a power distribution network according to any one of claims 1 to 7.
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