CN115343565A - Method and device for evaluating health state of parallel capacitor in real time - Google Patents
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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
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 existing parallel capacitor health state evaluation means cannot completely and effectively prevent the occurrence of the group injury and the 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 status of a parallel capacitor in real time, which includes:
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 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.
Optionally, obtaining an alarm threshold of the to-be-evaluated parallel capacitor based on the ledger information and in combination with 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 is specifically as follows:
wherein,
is a threshold value for an alarm that is,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel blocks per series block,
the number of the elements connected in parallel is,
the number of series-connected segments of a single capacitor,
the number of the fault 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 standing book information and the parallel capacitors to be evaluated;
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:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel stages per series stage,
the number of the elements connected in parallel is,
the number of series-connected segments of a single capacitor,
the number of the fault original 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 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 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.
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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 steps of a second embodiment of a method for real-time evaluation of the state of health of a parallel capacitor 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 operation 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 offset remote measurement value and the actual phase voltage remote measurement 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.
The method comprises the steps of obtaining account information and account information of the 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. Under the condition of not increasing any hardware equipment, the actual voltage ratio is determined by using an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value in the energy management system, the theoretical voltage ratio is determined by using 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 between 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 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;
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 offset remote measurement value and the actual phase voltage remote measurement 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 energy management system and is stored in the SCADA database, namely, 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 is specifically as follows:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel stages per series stage,
the number of the elements connected in parallel is,
the number of series stages of a single capacitor,
the number of the fault 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 generate element breakdown 1 The star-shaped connection of the single star-shaped connection wire and the double star-shaped connection wire can be uniformly judged according to the standard, and after equivalence, the single star-shaped connection wire can be defined as M 2 Is taken to be 0The double star connection of (1) assuming that k elements of a certain capacitor are broken down, comprises:
because the three-phase voltage symmetry of power, that is to say the phasor sum of three is zero, suppose that a certain single condenser of A looks of parallel capacitor has k components to puncture, then obtain according to the node voltage method of circuit principle:
thus, there are:
similarly, when a single capacitor of the B phase or the C phase has k elements to break down, the following elements are provided:
thus, a voltage ratio can be defined as
、
And
of (2) is calculated.
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 good choice, so the alarm threshold determination formula is specifically:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for each series sectionThe number of the parallel-connected units (a),
the number of the elements connected in parallel is,
the number of series-connected segments of a single capacitor,
the number of the fault original parts is,
in order to compare the voltages of the phases a,
in order to compare the voltages of the phases b,
in order to compare the voltages of the c-phase,
in order to complete the phase capacitance, the phase-locked loop is formed,
in order to be a faulty phase capacitance,
the phase capacitance value for a perfect star is,
the value of the phase capacitance of the star on which the fault capacitor is located,
the capacitance value of the series section in which the fault capacitor is located,
for the capacitance value of a perfect capacitor,
as is the value of the capacitance of the fault capacitor,
in order to be the capacity value,
is a remote-measured value of the a-phase voltage,
is a remote measurement value of the b-phase voltage,
is a remote-measured value of the c-phase voltage,
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 deviation telemetering value and the actual phase voltage telemetering 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. Under the condition of not increasing any hardware equipment, the actual voltage ratio is determined by using an actual neutral point voltage deviation remote measurement value and an actual phase voltage remote measurement value in the energy management system, the theoretical voltage ratio is determined by using 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 between 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 the health status of a parallel capacitor is shown, which 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 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 is specifically as follows:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel blocks per series block,
the number of the elements connected in parallel is,
the number of series-connected segments of a single capacitor,
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 present application further provides a computer-readable storage medium for storing program code for executing the method for evaluating the health status of the parallel capacitor in real time in the above method embodiments.
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 logical division, and other divisions may be realized in practice, for example, a plurality of 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 may be implemented in the form of hardware, or may also be implemented in the 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 usb 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 to illustrate the technical solutions of the present application, and not to limit 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 of the embodiments of the present application.
Claims (10)
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;
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.
2. The method for evaluating the health status of the parallel capacitor in real time according to claim 1, wherein the step of obtaining the alarm threshold of the parallel capacitor to be evaluated based on the standing book information and by combining a preset alarm threshold determination formula comprises the following steps:
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.
3. The method according to claim 1, wherein the machine account information comprises: 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:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel blocks per series block,
the number of the elements connected in parallel is,
the number of series-connected segments of a single capacitor,
the number of the fault elements is.
4. The method for evaluating the health state of the parallel capacitor in real time according to claim 1, wherein determining the health state of the parallel capacitor to be evaluated according to the magnitude relation between the voltage ratio and the alarm threshold comprises:
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.
5. 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 standing book information and the parallel capacitors to be evaluated;
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;
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.
6. The parallel capacitor state of health real-time evaluation device of claim 5, wherein 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;
and the alarm threshold value determining submodule is used for selecting the maximum theoretical voltage ratio as the alarm threshold value.
7. The parallel capacitor health status real-time evaluation device of claim 5, wherein the ledger information comprises: 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 is specifically as follows:
wherein,
in order to be the warning threshold value, the alarm threshold value,
in order to ensure the safety factor of the operation,
for the number of series stages of the parallel capacitor arrangement,
、
for the number of parallel stages per series stage,
the number of the elements connected in parallel is,
the number of series stages of a single capacitor,
the number of the fault original elements is.
8. The parallel capacitor real-time health assessment apparatus according to claim 5, wherein said 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.
9. An electronic device comprising a processor and a memory, the memory storing computer readable instructions that, when executed by the processor, perform the method of any of claims 1-4.
10. A storage medium on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the method according to any one of claims 1-4.
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