CN115343565B - Method and device for evaluating health state of parallel capacitor in real time - Google Patents

Method and device for evaluating health state of parallel capacitor in real time Download PDF

Info

Publication number
CN115343565B
CN115343565B CN202211276442.XA CN202211276442A CN115343565B CN 115343565 B CN115343565 B CN 115343565B CN 202211276442 A CN202211276442 A CN 202211276442A CN 115343565 B CN115343565 B CN 115343565B
Authority
CN
China
Prior art keywords
parallel capacitor
alarm threshold
determining
parallel
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202211276442.XA
Other languages
Chinese (zh)
Other versions
CN115343565A (en
Inventor
王俊波
张殷
刘崧
武利会
蒋维
李国伟
严司玮
车磊
吴越
宋安琪
李新
何胜红
郑伟钦
刘少辉
王智娇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foshan Power Supply Bureau of Guangdong Power Grid Corp
Original Assignee
Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foshan Power Supply Bureau of Guangdong Power Grid Corp filed Critical Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority to CN202211276442.XA priority Critical patent/CN115343565B/en
Publication of CN115343565A publication Critical patent/CN115343565A/en
Application granted granted Critical
Publication of CN115343565B publication Critical patent/CN115343565B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a method and a device for evaluating the health state of a parallel capacitor in real time, wherein the method comprises the following steps: acquiring account information and account information of a parallel capacitor to be evaluated; acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio; based on the machine account information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor; and determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value. And determining a theoretical voltage ratio by using the standing book information, and determining the health state of the parallel capacitor in real time under the condition of no power failure according to the magnitude relation between the actual voltage ratio and the theoretical voltage ratio.

Description

Method and device for evaluating health state of parallel capacitor in real time
Technical Field
The invention relates to the technical field of parallel capacitor health monitoring, in particular to a method and a device for evaluating the health state of a parallel capacitor in real time.
Background
The parallel capacitor is reactive compensation equipment in a power system and is mainly used for adjusting system voltage. In the running process of the parallel capacitor, the situations of bulging, oil leakage and unqualified capacitance are frequent, and group damage and group explosion happen more often, which becomes a great problem troubling production.
For the evaluation of the health state of a parallel capacitor, a periodic power failure preventive test method is generally adopted in the industry for a long time: the capacitance of each capacitor is periodically checked. However, incomplete statistics shows that the annual growth rate of the capacitor is maintained to be 3.0-5% in nearly 5 years, the main body defects of emergent and major defects of the capacitor are 89.3% in 10-35kV, and the annual defect rate is maintained to be about 6 groups of equipment per hundred groups of equipment per year. That is, the conventional parallel capacitor health status evaluation means cannot completely and effectively prevent the occurrence of group injury and group explosion.
Disclosure of Invention
The invention provides a method and a device for evaluating the health state of a parallel capacitor in real time, which realize the real-time evaluation of the health state of the parallel capacitor under the condition of no power failure through the magnitude relation of an actual voltage ratio and a theoretical voltage ratio.
In a first aspect, the invention provides a method for evaluating the health state of a parallel capacitor in real time, which comprises the following steps:
acquiring account information and account information of a parallel capacitor to be evaluated;
acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio;
based on the standing book information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor;
and determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value.
Optionally, obtaining the alarm threshold of the parallel capacitor to be evaluated based on the ledger information and by combining a preset alarm threshold determination formula, includes:
determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determination formula based on the ledger information;
and selecting the maximum theoretical voltage ratio as the alarm threshold value.
Optionally, the ledger information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel elements of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element; the alarm threshold determination formula specifically includes:
Figure 739335DEST_PATH_IMAGE001
；
wherein, the first and the second end of the pipe are connected with each other,
Figure 54910DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 655656DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 305949DEST_PATH_IMAGE004
number of series stages for parallel capacitor arrangements，
Figure 650342DEST_PATH_IMAGE005
、
Figure 86003DEST_PATH_IMAGE006
For the number of parallel stages per series stage,
Figure 592070DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 496704DEST_PATH_IMAGE008
the number of series stages of a single capacitor,
Figure 379209DEST_PATH_IMAGE009
the number of the fault original elements is.
Optionally, determining the health state of the parallel capacitor to be evaluated according to the magnitude relationship between the voltage ratio and the alarm threshold includes:
judging whether the voltage ratio is smaller than the alarm threshold value; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt.
In a second aspect, the present invention further provides a device for evaluating the health status of a parallel capacitor in real time, including:
the standing book information acquisition module is used for acquiring the parallel capacitor to be evaluated and the standing book information;
the remote measurement acquisition module is used for acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio;
the alarm threshold value determining module is used for obtaining an alarm threshold value of the to-be-evaluated parallel capacitor by combining a preset alarm threshold value determining formula based on the ledger information;
and the health state determining module is used for determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value.
Optionally, the alarm threshold determining module includes:
the theoretical voltage ratio determining submodule is used for determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determining formula based on the ledger information;
and the alarm threshold value determining submodule is used for selecting the maximum theoretical voltage ratio as the alarm threshold value.
Optionally, the ledger information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel-connected units of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element; the alarm threshold determination formula is specifically as follows:
Figure 669376DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 533296DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 971230DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 595110DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 490516DEST_PATH_IMAGE005
、
Figure 603965DEST_PATH_IMAGE006
for the number of parallel blocks per series block,
Figure 466879DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 691187DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 205214DEST_PATH_IMAGE009
the number of the fault elements is.
Optionally, the health status determination module comprises:
the judgment submodule is used for judging whether the voltage ratio is smaller than the alarm threshold value or not; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt.
A third aspect of the application provides an electronic device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for real-time evaluation of the health status of the parallel capacitor according to the first aspect according to instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for executing the method for real-time evaluation of the state of health of a parallel capacitor according to the first aspect.
According to the technical scheme, the invention has the following advantages:
the method comprises the steps of obtaining account information and account information of a parallel capacitor to be evaluated; acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage deviation telemetering value and the actual phase voltage telemetering value are used for determining an actual voltage ratio; based on the standing book information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor; and determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value. Under the condition of not increasing any hardware equipment, an actual neutral point voltage offset remote measurement value and an actual phase voltage remote measurement value in the energy management system are utilized to determine an actual voltage ratio, a theoretical voltage ratio is determined by utilizing the standing book information, and the health state of the parallel capacitors is determined in real time under the condition of no power failure according to the magnitude relation of the actual voltage ratio and the theoretical voltage ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
fig. 1 is a flowchart illustrating a first step of a method for real-time evaluating a health status of a parallel capacitor according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a method for real-time health status evaluation of parallel capacitors according to the present invention;
fig. 3 is a block diagram of a parallel capacitor health status real-time evaluation apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for analyzing and reporting power grid operating data.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a first step of a method for evaluating a health status of a parallel capacitor in real time according to an embodiment of the present invention, which may specifically include the following steps:
s101, acquiring account information and parallel capacitors to be evaluated;
s102, acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage deviation telemetering value and the actual phase voltage telemetering value are used for determining an actual voltage ratio;
s103, based on the standing book information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor;
and S104, determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value.
According to the embodiment of the invention, the parallel capacitor to be evaluated and the standing book information are obtained; acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio; based on the standing book information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor; and determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold. Under the condition of not increasing any hardware equipment, an actual neutral point voltage offset remote measurement value and an actual phase voltage remote measurement value in the energy management system are utilized to determine an actual voltage ratio, a theoretical voltage ratio is determined by utilizing the standing book information, and the health state of the parallel capacitors is determined in real time under the condition of no power failure according to the magnitude relation of the actual voltage ratio and the theoretical voltage ratio.
Referring to fig. 2, a flowchart of a second embodiment of the method for real-time evaluating the health status of a parallel capacitor according to the present invention includes:
step S201, acquiring account information and parallel capacitors to be evaluated; the ledger information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel-connected units of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element;
step S202, obtaining an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage deviation telemetering value and the actual phase voltage telemetering value are used for determining an actual voltage ratio;
in the embodiment of the invention, the actual neutral point voltage deviation and the actual three-phase voltage value of the parallel capacitor are measured in real time at the equipment body, a group of measurement data is sent to the energy management system every 15min, meanwhile, a time tag is attached to the measurement data and is stored in the SCADA database, which is called as a remote measurement value, and the latest remote measurement value of the neutral point voltage deviation of the parallel capacitor to be evaluated, namely the actual neutral point voltage deviation remote measurement value, and the latest remote measurement value of the phase voltage, namely the actual phase voltage remote measurement value, can be obtained by accessing the SCADA database of the energy management system.
Step S203, determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determination formula based on the ledger information; the alarm threshold determination formula specifically includes:
Figure 489565DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 574195DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 602194DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 472192DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 865127DEST_PATH_IMAGE005
、
Figure 764950DEST_PATH_IMAGE006
for the number of parallel blocks per series block,
Figure 518012DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 554101DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 117937DEST_PATH_IMAGE009
the number of the fault original elements is.
In the embodiment of the invention, because the parallel capacitors all adopt the internal fuse structure, a single capacitor has one element number which allows failure, and double star connection can be equivalent to the parallel number of M no matter which star has the capacitor to break down 1 The star-shaped connection of the star-shaped switch is broken down, so that the single star-shaped connection and the double star-shaped connection can be uniformly judged according to the standard, and after equivalence, the single star-shaped connection can be defined as M 2 A double star connection with a value of 0, assuming that there are k elements in a capacitor that break down, then:
Figure 239477DEST_PATH_IMAGE010
；
Figure 297694DEST_PATH_IMAGE011
；
Figure 391552DEST_PATH_IMAGE012
；
Figure 188607DEST_PATH_IMAGE013
；
Figure 984393DEST_PATH_IMAGE014
；
Figure 892306DEST_PATH_IMAGE015
；
Figure 840671DEST_PATH_IMAGE016
；
because the three-phase voltage symmetry of power, that is the phasor sum of three is zero, supposing that a certain single condenser of A looks of parallel capacitor has k components to break down, then obtain according to the node voltage method of circuit principle:
Figure 808627DEST_PATH_IMAGE017
；
thus, there are:
Figure 593174DEST_PATH_IMAGE018
；
similarly, when a single capacitor of the B phase or the C phase has k elements to break down, the following elements are provided:
Figure 242461DEST_PATH_IMAGE019
；
Figure 373228DEST_PATH_IMAGE020
；
thus, a voltage ratio can be defined as
Figure 699036DEST_PATH_IMAGE021
、
Figure 16885DEST_PATH_IMAGE022
And
Figure 469863DEST_PATH_IMAGE023
maximum value of (2).
However, in practical application, the size of the alarm threshold is not completely a voltage ratio, and it needs to consider the safety factor of the equipment operation, and generally takes 1.1 as a preferable value, so the alarm threshold determination formula is specifically:
Figure 143552DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 453311DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 196139DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 436496DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 276277DEST_PATH_IMAGE005
、
Figure 694620DEST_PATH_IMAGE006
for the number of parallel stages per series stage,
Figure 941055DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 532574DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 430123DEST_PATH_IMAGE009
the number of the fault original parts is,
Figure 81684DEST_PATH_IMAGE021
in order to compare the voltage of the phase a,
Figure 48372DEST_PATH_IMAGE022
in order to compare the voltages of the phases b,
Figure 443581DEST_PATH_IMAGE023
in order to compare the c-phase voltage,
Figure 195636DEST_PATH_IMAGE024
in order to complete the phase capacitance, the phase-locked loop is formed,
Figure 18099DEST_PATH_IMAGE025
in order to be a fault phase capacitance,
Figure 985266DEST_PATH_IMAGE026
the phase capacitance value for a perfect star is,
Figure 121850DEST_PATH_IMAGE027
the value of the phase capacitance of the star on which the fault capacitor is located,
Figure 790728DEST_PATH_IMAGE028
the capacitance value of the series section in which the fault capacitor is located,
Figure 971043DEST_PATH_IMAGE029
in order to have the capacitance value of a perfect capacitor,
Figure 663055DEST_PATH_IMAGE030
for the capacitance value of the fault capacitor,
Figure 665646DEST_PATH_IMAGE031
in order to be the capacity value,
Figure 877447DEST_PATH_IMAGE032
is a remote-measured value of the a-phase voltage,
Figure 41712DEST_PATH_IMAGE033
is a remote-measured value of the b-phase voltage,
Figure 221021DEST_PATH_IMAGE034
is a remote measurement value of the c-phase voltage,
Figure 761724DEST_PATH_IMAGE035
is the angular frequency.
Step S204, selecting the maximum theoretical voltage ratio as the alarm threshold;
step S205, judging whether the voltage ratio is smaller than the alarm threshold value; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt.
According to the method for evaluating the health state of the parallel capacitor in real time, the health state of the parallel capacitor to be evaluated and the standing book information are obtained; acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio; based on the standing book information, combining a preset alarm threshold value determination formula to obtain an alarm threshold value of the to-be-evaluated parallel capacitor; and determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold value. Under the condition of not increasing any hardware equipment, an actual neutral point voltage offset remote measurement value and an actual phase voltage remote measurement value in the energy management system are utilized to determine an actual voltage ratio, a theoretical voltage ratio is determined by utilizing the standing book information, and the health state of the parallel capacitors is determined in real time under the condition of no power failure according to the magnitude relation of the actual voltage ratio and the theoretical voltage ratio.
Referring to fig. 3, a block diagram of an embodiment of a device for real-time evaluating a health status of a parallel capacitor is shown, and includes the following modules:
the standing book information acquisition module 301 is used for acquiring the standing book information and the parallel capacitors to be evaluated;
a telemetry obtaining module 302, configured to obtain an actual neutral point voltage deviation telemetering value and an actual phase voltage telemetering value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio;
an alarm threshold determination module 303, configured to obtain an alarm threshold of the to-be-evaluated parallel capacitor based on the ledger information in combination with a preset alarm threshold determination formula;
and a health state determination module 304, configured to determine a health state of the to-be-evaluated parallel capacitor according to a magnitude relationship between the voltage ratio and the alarm threshold.
In an optional embodiment, the alarm threshold determination module 303 includes:
the theoretical voltage ratio determining submodule is used for determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determining formula based on the ledger information;
and the alarm threshold value determining submodule is used for selecting the maximum theoretical voltage ratio as the alarm threshold value.
In an optional embodiment, the ledger information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel-connected units of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element; the alarm threshold determination formula is specifically as follows:
Figure 326566DEST_PATH_IMAGE001
；
wherein, the first and the second end of the pipe are connected with each other,
Figure 927312DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 328337DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 361146DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 593544DEST_PATH_IMAGE005
、
Figure 302874DEST_PATH_IMAGE006
for each series connection of blocks connected in parallelThe number of the devices is equal to or less than the total number of the devices,
Figure 253513DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 322969DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 675453DEST_PATH_IMAGE009
the number of the fault elements is.
In an optional embodiment, the health status determination module comprises:
the judgment submodule is used for judging whether the voltage ratio is smaller than the alarm threshold value or not; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt.
The application also provides an electronic device, which comprises a processor and a memory;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the method for evaluating the health state of the parallel capacitor in the embodiment of the method in real time according to the instructions in the program code.
The application also provides a computer-readable storage medium for storing program codes, wherein the program codes are used for executing the method for evaluating the health state of the parallel capacitor in real time in the method embodiment.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (4)

1. A method for evaluating the health state of a parallel capacitor in real time is characterized by comprising the following steps:
acquiring account information and account information of a parallel capacitor to be evaluated;
acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage offset remote measurement value and the actual phase voltage remote measurement value are used for determining an actual voltage ratio;
obtaining an alarm threshold value of the to-be-evaluated parallel capacitor based on the standing book information and by combining a preset alarm threshold value determination formula, wherein the alarm threshold value comprises: determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determination formula based on the ledger information; selecting the maximum theoretical voltage ratio as the alarm threshold;
determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold, wherein the method comprises the following steps: judging whether the voltage ratio is smaller than the alarm threshold value; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt;
the standing book information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel elements of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element; the alarm threshold determination formula specifically includes:
Figure 563137DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 480278DEST_PATH_IMAGE002
in order to be the warning threshold value, the alarm threshold value,
Figure 73064DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 468273DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 344963DEST_PATH_IMAGE005
、
Figure 980474DEST_PATH_IMAGE006
for the number of parallel stages per series stage,
Figure 247508DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 508725DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 990653DEST_PATH_IMAGE009
the number of the fault elements is.
2. A device for evaluating the health state of a parallel capacitor in real time is characterized by comprising:
the standing book information acquisition module is used for acquiring the parallel capacitor to be evaluated and the standing book information;
the remote measurement acquisition module is used for acquiring an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value of the parallel capacitor to be evaluated from an energy management system database; the actual neutral point voltage deviation telemetering value and the actual phase voltage telemetering value are used for determining an actual voltage ratio;
the alarm threshold value determining module is used for obtaining an alarm threshold value of the to-be-evaluated parallel capacitor by combining a preset alarm threshold value determining formula based on the ledger information;
the health state determining module is used for determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold;
the alarm threshold determination module comprises:
the theoretical voltage ratio determining submodule is used for determining all corresponding theoretical voltage ratios by combining a preset alarm threshold value determining formula based on the ledger information;
the alarm threshold value determining submodule is used for selecting the maximum theoretical voltage ratio as the alarm threshold value;
the health status determination module comprises:
the judgment submodule is used for judging whether the voltage ratio is smaller than the alarm threshold value or not; if yes, determining that the parallel capacitor to be evaluated is healthy; if not, determining that the parallel capacitor to be evaluated is unhealthy, and generating an alarm prompt;
the ledger information includes: the number of series sections of the parallel capacitor device, the number of parallel elements and the number of parallel elements of each series section, the number of series sections and the number of fault elements of a single capacitor, and the capacitance of each element; the alarm threshold determination formula specifically includes:
Figure 984017DEST_PATH_IMAGE001
；
wherein, the first and the second end of the pipe are connected with each other,
Figure 800663DEST_PATH_IMAGE002
is a threshold value for an alarm that is,
Figure 350724DEST_PATH_IMAGE003
in order to ensure the safety factor of the operation,
Figure 874109DEST_PATH_IMAGE004
for the number of series stages of the parallel capacitor arrangement,
Figure 366270DEST_PATH_IMAGE005
、
Figure 415086DEST_PATH_IMAGE006
for the number of parallel stages per series stage,
Figure 690209DEST_PATH_IMAGE007
the number of the elements connected in parallel is,
Figure 395997DEST_PATH_IMAGE008
the number of series-connected segments of a single capacitor,
Figure 544213DEST_PATH_IMAGE009
the number of the fault elements is.
3. An electronic device comprising a processor and a memory storing computer readable instructions that, when executed by the processor, perform the method of claim 1.
4. A storage medium on which a computer program is stored which, when being executed by a processor, carries out the method according to claim 1.
CN202211276442.XA 2022-10-19 2022-10-19 Method and device for evaluating health state of parallel capacitor in real time Active CN115343565B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211276442.XA CN115343565B (en) 2022-10-19 2022-10-19 Method and device for evaluating health state of parallel capacitor in real time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211276442.XA CN115343565B (en) 2022-10-19 2022-10-19 Method and device for evaluating health state of parallel capacitor in real time

Publications (2)

Publication Number Publication Date
CN115343565A CN115343565A (en) 2022-11-15
CN115343565B true CN115343565B (en) 2023-01-24

Family

ID=83956997

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211276442.XA Active CN115343565B (en) 2022-10-19 2022-10-19 Method and device for evaluating health state of parallel capacitor in real time

Country Status (1)

Country Link
CN (1) CN115343565B (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09322393A (en) * 1996-05-27 1997-12-12 Nissin Electric Co Ltd Abnormality detecting method for capacitor device
CN2569409Y (en) * 2002-06-06 2003-08-27 褚庆喜 Combined overvoltage protector
CN103344853A (en) * 2013-06-24 2013-10-09 国家电网公司 Method for judging faults of parallel capacitors by means of natural vibration frequency
CN105098725A (en) * 2014-05-12 2015-11-25 北京诺德威电力技术开发有限责任公司 Reactive compensation device protecting method and reactive compensation device protecting system
CN106168638B (en) * 2016-08-31 2022-11-22 国网冀北电力有限公司唐山供电公司 Method for realizing online monitoring of high-voltage parallel capacitor by using relay protection device
CN107884645A (en) * 2017-11-03 2018-04-06 山东理工大学 Based on voltage ratio compared with power capacitor method for monitoring operation states
CN108710099B (en) * 2018-05-24 2021-08-31 广东电网有限责任公司广州供电局 Monitoring and alarming method and system for capacitor voltage transformer
CN109613374B (en) * 2019-01-11 2020-10-30 国网冀北电力有限公司唐山供电公司 Capacitor comprehensive online monitoring method based on redundant data
CN111222085B (en) * 2020-04-15 2020-08-04 广东电网有限责任公司佛山供电局 Real-time evaluation method for health state of capacitive voltage transformer
CN112198390B (en) * 2020-12-03 2021-04-02 广东电网有限责任公司佛山供电局 Real-time evaluation method and system for health state of capacitor bank
CN113419132B (en) * 2021-08-09 2022-02-25 广东电网有限责任公司 Early warning method and device for capacitor bank fault
CN114123113A (en) * 2021-12-08 2022-03-01 中国南方电网有限责任公司超高压输电公司梧州局 Method and device for monitoring unbalanced current of neutral point of parallel capacitor bank

Also Published As

Publication number Publication date
CN115343565A (en) 2022-11-15

Similar Documents

Publication Publication Date Title
CN107037279B (en) A kind of shunt capacitor monitoring system and method
CN111751777B (en) Voltage transformer running state diagnosis method
CN108879654B (en) Remote diagnosis method based on abnormal remote measurement of abnormal equipment
Aminifar et al. A review of power system protection and asset management with machine learning techniques
CN109270482B (en) Online evaluation method for metering accuracy of voltage transformer and terminal equipment
CN110361686A (en) Capacitance type potential transformer fault detection method based on multi-parameter
CN112710930A (en) Online evaluation method for insulation state in capacitor voltage transformer
BR112019020188A2 (en) computer program system, method and product to analyze data from an electric power system
CN116881675B (en) Power equipment state monitoring method based on Bayesian algorithm
CN110176768A (en) A kind of electric power data analysis method
CN116500385B (en) Power transmission network monitoring and checking method, device, equipment and medium
CN113419132B (en) Early warning method and device for capacitor bank fault
CN103983865A (en) Series reactor power capacitor group operating state real-time online monitoring method
CN115343565B (en) Method and device for evaluating health state of parallel capacitor in real time
CN114123113A (en) Method and device for monitoring unbalanced current of neutral point of parallel capacitor bank
CN104834305A (en) Distribution network automated terminal telemetering abnormity analyzing system and method based on DMS system
Goodarzi et al. Multi‐criteria protection scheme for online element failure detection in shunt capacitor banks
CN113872163A (en) Relay protection setting value calibration method and terminal equipment
CN114460409B (en) Capacitor monitoring method, device and equipment based on neutral point unbalance data
CN115600879A (en) Circuit breaker abnormity early warning method, system and related device
CN111443305A (en) Method and device for detecting line fault by using electric energy deviation value
CN204758760U (en) Current monitoring device that capacitor element punctures
CN114492869A (en) Power distribution system health diagnosis method based on Internet of things technology
CN111781554A (en) Metering device fault determination method and system based on four-quadrant electric energy data
CN115291024B (en) Client abnormity identification method, system, equipment and medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant