CN112305319A - Method and system for online monitoring of converter transformer valve side sleeve parameters - Google Patents

Method and system for online monitoring of converter transformer valve side sleeve parameters Download PDF

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Publication number
CN112305319A
CN112305319A CN202011543220.0A CN202011543220A CN112305319A CN 112305319 A CN112305319 A CN 112305319A CN 202011543220 A CN202011543220 A CN 202011543220A CN 112305319 A CN112305319 A CN 112305319A
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signal
converter transformer
valve side
group
converter
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CN112305319B (en
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尹朋博
许佐明
胡伟
谢雄杰
罗晓庆
刘泰蔚
万保权
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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    • 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
    • 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
    • G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
    • G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor

Abstract

The invention provides a method and a system for monitoring parameters of a valve side sleeve of a converter transformer on line. The method and the system divide the converter transformer valve side sleeve to be monitored into a plurality of categories according to preset classification rules, determine the grouping number of the valve side sleeve in each category and the valve side sleeve in each group, then synchronously acquire the signal data representing leakage current of the valve side sleeve to be monitored in the same time period as data to be analyzed, select a reference signal and a comparison signal for the grouped data to be analyzed, respectively calculate the phase angle difference of a fundamental wave component and a harmonic wave component and the signal amplitude to determine the relative dielectric loss factor and capacitance ratio, and further compare the calculation result with a set value to determine the operating state of the converter transformer valve side sleeve. The method and the system comprehensively analyze the calculation results of the relative dielectric loss factor and the capacitance ratio under each classification, and can accurately position the valve side sleeve of the converter transformer with the fault or the abnormity.

Description

Method and system for online monitoring of converter transformer valve side sleeve parameters
Technical Field
The present invention relates to the field of online monitoring of capacitive devices, and more particularly, to a method and system for online monitoring of converter transformer valve-side bushing parameters.
Background
The converter transformer valve side sleeve is key equipment and components of a converter station and a converter transformer and plays roles in conductive connection, insulation isolation and mechanical connection. The valve side sleeve of the converter transformer is a necessary channel for electric energy transmission of the converter station, and the performance index and the operation reliability of the valve side sleeve are related to the safety of the whole direct current system. At present, the faults of imported or domestic AC/DC bushings are frequent, the bushings are damaged if the faults are frequent, and the bushings are exploded and damage a transformer if the faults are serious, so that power failure of a power grid is caused, the safe operation of the power grid is seriously influenced, and huge economic loss and social influence are caused. According to incomplete statistics, 94 cases of defects are commonly found in the sleeve of the converter station between 2007 and 2017 of national grid companies, the main defect types comprise internal discharge, current-carrying connecting part overheating, poor sealing, capacitor core cracking and the like, and finally, insulation failure is shown to cause the main equipment to be forced to stop operation. And the related faults of the sleeve often have the characteristics of slow development but sudden outbreak, and the timely problems can be found only by monitoring the running state of the sleeve on line in real time. However, at present, the online monitoring means for the converter transformer valve side sleeve is very limited, and only two modes of sleeve internal gas pressure monitoring and converter transformer valve side sleeve end screen voltage divider voltage monitoring are available, and the two modes are not sensitive enough to the response of the two at the initial stage of the fault.
The dielectric loss factor and the capacitance are key parameters of the power equipment, and the on-line monitoring of the dielectric loss factor and the capacitance is applied to other capacitive power equipment in engineering. However, the conventional device and method for monitoring the dielectric loss factor and the capacitance are not suitable for the valve-side sleeve of the converter transformer due to the existence of various special factors, such as the voltage and current waveforms carried by the converter transformer sleeve contain direct-current components and harmonic components, the voltage waveforms carried by different sleeves are different, and the voltage reference signals of the voltage-free transformer exist.
Disclosure of Invention
In order to solve the technical problem that the device and the method for monitoring the dielectric loss factor and the capacitance in the prior art are not suitable for the valve side sleeve of the converter transformer, the invention provides a method for monitoring the parameters of the valve side sleeve of the converter transformer on line, which comprises the following steps:
determining a converter transformer valve side sleeve to be monitored according to a preset selection scheme of the converter transformer valve side sleeve;
dividing the converter transformer valve side sleeves to be monitored into a plurality of categories according to preset classification rules, and determining the grouping number of the converter transformer valve side sleeves according with each classification rule and the converter transformer valve side sleeves in each group;
synchronously acquiring the signal representing the leakage current of each converter transformer valve side sleeve to be monitored, and selecting the signal data representing the leakage current acquired in the same time period as data to be analyzed;
selecting data to be analyzed of any converter transformer valve side sleeve from the data to be analyzed of each group of converter transformer valve side sleeves as a reference signal, taking the data to be analyzed of other converter transformer valve side sleeves as a comparison signal, and calculating fundamental component and harmonic component phase angle difference between the comparison signal and the reference signal and signal amplitude values of the comparison signal and the reference signal;
and determining the relative dielectric loss factor and capacitance ratio of the parameters of the valve side sleeve of the converter transformer to be monitored, wherein the relative dielectric loss factor of the valve side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal.
Further, after calculating the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group according to the phase angle difference of the fundamental component and the harmonic component between each group of the comparison signal and the reference signal and the preset initial value of the dielectric loss factor, and calculating the capacitance ratio of the valve-side sleeve of the converter transformer in each group according to the signal amplitudes of the comparison signal and the reference signal, the method further comprises the step of comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively to determine the operation state of the monitored converter-side sleeve of the converter transformer.
Further, before determining the converter transformer valve side bushing to be monitored according to a preset selection scheme of the converter transformer valve side bushing, the method further comprises the following steps:
setting a selection scheme of valve side sleeves of the converter transformers, wherein the selection scheme comprises selecting all the valve side sleeves of the converter transformers of a group of three-phase converter transformers in the converter station, selecting all the valve side sleeves of the converter transformers of the same valve hall in the converter station with the same polarity, selecting all the valve side sleeves of the converter transformers of the same valve hall in the converter station and selecting all the valve side sleeves of the converter transformers in the converter station;
setting a classification rule of a converter transformer valve side sleeve, wherein the classification rule comprises the following steps: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2;
setting parameter values of the converter transformer valve side sleeve to be monitored, wherein the parameter values comprise a medium loss factor initial value of the converter transformer valve side sleeve using the acquired signal as a reference signal, and range values of relative medium loss factors and capacitance ratios under each fundamental component and harmonic component of the signal acquired by the converter transformer valve side sleeve to be monitored.
Further, the synchronously acquiring the signal representing the leakage current of each converter transformer valve side bushing to be monitored refers to synchronously acquiring at least one of an output signal of a bushing end screen voltage detector, a bushing secondary end screen voltage signal, a bushing end screen leakage current signal and an output signal of a current transformer on a bushing to be monitored.
Further, the calculation formula includes that the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between each group of the comparison signal and the reference signal and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve-side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal:
Figure DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure 100002_DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal in grouped data to be analyzed of converter transformer valve side sleeve
Figure DEST_PATH_IMAGE003
And a reference signal
Figure 100002_DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure DEST_PATH_IMAGE005
to be used as reference signal
Figure 72939DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure 100002_DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 712867DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure DEST_PATH_IMAGE007
is a reference signal
Figure 635824DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure 100002_DEST_PATH_IMAGE008
as a contrast signal
Figure 920085DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure 100002_DEST_PATH_IMAGE010
，
Figure DEST_PATH_IMAGE011
，
Figure 100002_DEST_PATH_IMAGE012
，
Figure DEST_PATH_IMAGE013
，
Figure 100002_DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure 100002_DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure DEST_PATH_IMAGE017
the highest harmonic order, the fundamental component order is 1.
Further, comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively, and determining the operation state of the sleeve on the side of the converter transformer valve to be monitored comprises the following steps:
when all are
Figure 272700DEST_PATH_IMAGE006
Or
Figure 732631DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 103570DEST_PATH_IMAGE006
Or
Figure 318651DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 266884DEST_PATH_IMAGE006
Or if the set range value is exceeded, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 327244DEST_PATH_IMAGE006
Or
Figure 552689DEST_PATH_IMAGE009
If the value of the range is not exceeded, determining the sleeve corresponding to the reference signal in the undetermined group, and
Figure 358577DEST_PATH_IMAGE006
or
Figure 138315DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
According to another aspect of the invention, the invention provides a system for online monitoring of converter transformer valve side bushing parameters, the system comprising:
the sleeve selecting unit is used for determining the converter transformer valve side sleeve to be monitored according to a preset selection scheme of the converter transformer valve side sleeve;
the sleeve grouping unit is used for dividing the converter transformer valve side sleeves to be monitored into a plurality of categories according to preset classification rules, and determining the grouping number of the converter transformer valve side sleeves according with each classification rule and the converter transformer valve side sleeves in each group;
the signal acquisition unit is used for synchronously acquiring the signal representing the leakage current of each converter transformer valve side sleeve to be monitored, and selecting the signal data representing the leakage current acquired in the same time period as the data to be analyzed;
the first calculation unit is used for selecting data to be analyzed of any converter transformer valve side sleeve from the data to be analyzed of each group of converter transformer valve side sleeves as a reference signal, using the data to be analyzed of other converter transformer valve side sleeves as a comparison signal, and calculating fundamental component and harmonic component phase angle difference between the comparison signal and the reference signal and signal amplitude values of the comparison signal and the reference signal;
and the second calculating unit is used for determining the relative dielectric loss factor and capacitance ratio of the parameters of the valve side sleeve of the converter transformer to be monitored, wherein the relative dielectric loss factor of the valve side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between each group of the comparison signals and the reference signals and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signals and the reference signals.
Further, the system further comprises:
and the state determining unit is used for comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively to determine the operation state of the sleeve on the side of the converter transformer valve to be monitored.
Further, the system further comprises:
the system comprises a scheme setting unit, a converter transformer valve side sleeve selection unit and a control unit, wherein the scheme setting unit is used for setting a converter transformer valve side sleeve selection scheme, and the selection scheme comprises the selection of all converter transformer valve side sleeves of a group of three-phase converter transformers in a converter station, the selection of all converter transformer valve side sleeves of the same valve hall in the converter station and the selection of all converter transformer valve side sleeves in the converter station;
the classification rule unit is used for setting a classification rule of the converter transformer valve side sleeve, and the classification rule comprises the following steps: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2;
and the parameter setting unit is used for setting the parameter values of the converter transformer valve side sleeve to be monitored, wherein the parameter values comprise the initial value of the dielectric loss factor of the converter transformer valve side sleeve taking the acquired signal as a reference signal and the range value of the relative dielectric loss factor and capacitance ratio under each fundamental component and harmonic component of the signal acquired by the converter transformer valve side sleeve to be monitored.
Further, the step of synchronously acquiring the signal representing the leakage current of each converter transformer valve side bushing to be monitored by the signal acquisition unit means that at least one of an output signal of a bushing end screen voltage detector, a bushing secondary end screen voltage signal, a bushing end screen leakage current signal and an output signal of a current transformer on the bushing to be monitored is synchronously acquired. .
Further, the second calculating unit calculates the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal in each group and a preset initial value of the dielectric loss factor, and calculates the capacitance ratio of the valve-side sleeve of the converter transformer in each group according to the signal amplitudes of the comparison signal and the reference signal, wherein the calculation formula is as follows:
Figure 64682DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure 20000DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal in grouped data to be analyzed of converter transformer valve side sleeve
Figure 904779DEST_PATH_IMAGE003
And a reference signal
Figure 827605DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure 760926DEST_PATH_IMAGE005
to be used as reference signal
Figure 695384DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure 360851DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 911918DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure 806187DEST_PATH_IMAGE007
is a reference signal
Figure 63993DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure 24996DEST_PATH_IMAGE008
as a contrast signal
Figure 673146DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure 745008DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure 122899DEST_PATH_IMAGE010
，
Figure 113858DEST_PATH_IMAGE011
，
Figure 373938DEST_PATH_IMAGE012
，
Figure 124856DEST_PATH_IMAGE013
，
Figure 153992DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure 394481DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure 765026DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure 178689DEST_PATH_IMAGE017
the highest harmonic order, the fundamental component order is 1.
Further, comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively, and determining the operation state of the sleeve on the side of the converter transformer valve to be monitored comprises the following steps:
when all are
Figure 203277DEST_PATH_IMAGE006
Or
Figure 676984DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 849339DEST_PATH_IMAGE006
Or
Figure 925749DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 195056DEST_PATH_IMAGE006
Or
Figure 449451DEST_PATH_IMAGE009
If the value exceeds the set range value, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 905840DEST_PATH_IMAGE006
Or
Figure 864569DEST_PATH_IMAGE009
If the value of the range is not exceeded, determining the sleeve corresponding to the reference signal in the undetermined group, and
Figure 348902DEST_PATH_IMAGE006
or
Figure 429990DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
The method and the system for on-line monitoring the parameters of the valve side sleeve of the converter transformer, which are provided by the technical scheme of the invention, determine the valve side sleeve of the converter transformer to be monitored through a preset selection scheme of the valve side sleeve of the converter transformer, divide the valve side sleeve of the converter transformer to be monitored into a plurality of categories according to preset classification rules, determine the grouping number of the valve side sleeve of the converter transformer according to each classification rule and the valve side sleeve of the converter transformer in each group, then synchronously acquire the signal data representing leakage current of the valve side sleeve to be monitored in the same time period as data to be analyzed, respectively analyze the phase angle difference of fundamental wave components and harmonic wave components and the signal amplitude value after selecting reference signals and comparison signals for the grouped data to be analyzed, and further determine the relative dielectric loss factor and capacitance ratio value, and comparing the calculation result with a set value to determine the running state of the converter transformer valve side sleeve. The method and the system comprehensively analyze the calculation results of the relative dielectric loss factor and the capacitance ratio under each classification by setting various classification rules of the converter transformer valve side sleeve, and accurately position the fault or abnormal converter transformer valve side sleeve, thereby accurately monitoring the running state of the sleeve in real time and ensuring the safe and reliable running of a direct current transmission system.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method for on-line monitoring of converter transformer valve side bushing parameters according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative to a valve side bushing of a converter transformer in accordance with a preferred embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for on-line monitoring of converter transformer valve side bushing parameters according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method for on-line monitoring of converter transformer valve side bushing parameters according to a preferred embodiment of the present invention. As shown in fig. 1, the method 100 for online monitoring of the converter transformer valve side bushing parameter according to the preferred embodiment begins at step 101.
In step 101, a selection scheme of valve side bushings of a converter transformer is set, wherein the selection scheme includes selecting all valve side bushings of a set of three-phase converter transformers in a converter station, selecting all valve side bushings of the same polarity of the same valve hall in the converter station, selecting all valve side bushings of the same valve hall in the converter station, and selecting all valve side bushings of the converter transformer in the converter station.
In step 102, a classification rule of a converter transformer valve side bushing is set, where the classification rule includes: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: and classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2.
In step 103, setting parameter values of the converter transformer valve side bushing to be monitored, wherein the parameter values include a dielectric loss factor initial value of the converter transformer valve side bushing using the acquired signal as a reference signal, and range values of relative dielectric loss factor and capacitance ratio under each fundamental component and harmonic component of the signal acquired by the converter transformer valve side bushing to be monitored.
In step 104, the converter transformer valve side bushing to be monitored is determined according to the set selection scheme of the converter transformer valve side bushing.
Fig. 2 is a schematic view of an alternative of a valve side bushing of a converter transformer according to a preferred embodiment of the invention. As shown in fig. 2, the option of the bushing is to wire the same polarity converter transformer system in the same valve hall of the converter station, and the system includes a set of Y-Y connected three-phase transformers and a set of Y-D connected three-phase transformers.
In step 105, the converter transformer valve side bushings to be monitored are classified into a plurality of categories according to the set classification rules, and the number of groups of converter transformer valve side bushings conforming to each classification rule and the converter transformer valve side bushings in each group are determined.
As can be seen from fig. 2, according to the classification rule of the set converter transformer valve side bushing, the classification of the two sets of transformers is as follows:
first type grouping: group 1: CdA and CmC, group 2: CdB, CmA; and 3, group: CdC, CmB; 4 groups are as follows: CnA, CnB, CnC.
Grouping of the second type: group 1: CyA, CyB, CyC, CnA, CnB, CnC. And 2, group: CdA, CmC, CdB, CmA, CdC, CmB.
Grouping of the third kind: group 1: CyA, CnA, CdA, CmA; and 2, group: CyB, CnB, CdB, CmB; and 3, group: CyC, CnC, CmC, CdC.
The valve side casing to be monitored is divided into different classification groups according to the classification rules, so that the collected signals of the same valve side casing can be cross-verified through different results in a plurality of groups to judge the failed or abnormal valve side casing, and the accuracy is higher.
And 106, synchronously acquiring the signal representing the leakage current of each converter transformer valve side sleeve to be monitored, and selecting the signal data representing the leakage current acquired in the same time period as the data to be analyzed.
Preferably, the step of synchronously acquiring the signal representing the leakage current of each converter transformer valve side bushing to be monitored refers to synchronously acquiring at least one of an output signal of a bushing end screen voltage detector, a bushing secondary end screen voltage signal, a bushing end screen leakage current signal and an output signal of a current transformer on a bushing to be monitored.
In step 107, the data to be analyzed of any converter transformer valve side sleeve is selected from the data to be analyzed of each group of converter transformer valve side sleeves as a reference signal, the data to be analyzed of other converter transformer valve side sleeves is used as a comparison signal, and the fundamental component and harmonic component phase angle difference between the comparison signal and the reference signal and the signal amplitude of the comparison signal and the reference signal are calculated.
The phase angle difference between the contrast signal and the reference signal can be realized by hardware and software. And a zero-crossing detection method and a zero-crossing voltage comparison method are optimized in a hardware mode. The software method preferably selects a harmonic analysis method, a correlation function method, a high-order sine fitting method and a sine wave parameter method.
In step 108, the relative dielectric loss factor and capacitance ratio of the valve-side sleeve parameters of the converter transformer to be monitored are determined, wherein the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and the preset initial value of the dielectric loss factor, and the capacitance ratio of the valve-side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal.
Because the voltage and current waveforms borne by the sleeve on the valve side of the converter transformer contain fundamental wave components and harmonic wave components, the phase angle difference and the signal amplitude are respectively calculated through the fundamental wave components and the harmonic wave components along with the voltage and the current of the sleeve, the relative dielectric loss coefficient and the capacitance ratio are determined, then comparison is carried out, when any one result value is abnormal, the running state of the sleeve can be judged, and the accuracy of identifying the fault or the abnormality of the sleeve is greatly improved.
Preferably, the calculation formula includes that the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between each group of the comparison signal and the reference signal and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve-side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal:
Figure 249042DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure 542620DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal and reference signal in grouped to-be-analyzed data of converter transformer valve side sleeve
Figure 458623DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure 569668DEST_PATH_IMAGE005
to be used as reference signal
Figure 266228DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure 238863DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 9373DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure 166685DEST_PATH_IMAGE007
is a reference signal
Figure 708132DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure 609092DEST_PATH_IMAGE008
as a contrast signal
Figure 171791DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure 703267DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure 843261DEST_PATH_IMAGE010
，
Figure 672545DEST_PATH_IMAGE011
，
Figure 479964DEST_PATH_IMAGE012
，
Figure 854445DEST_PATH_IMAGE013
，
Figure 481736DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure 662181DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure 950205DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure 885800DEST_PATH_IMAGE017
the highest harmonic order, the fundamental component order is 1.
In step 109, the relative dielectric loss factor and capacitance ratio are compared with preset range values to determine the operation state of the sleeve on the valve side of the converter transformer.
Preferably, comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively, and determining the operation state of the sleeve on the side of the converter transformer valve to be monitored comprises:
when all are
Figure 875753DEST_PATH_IMAGE006
Or
Figure 656627DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 297693DEST_PATH_IMAGE006
Or
Figure 341872DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 209334DEST_PATH_IMAGE006
Or
Figure 669266DEST_PATH_IMAGE009
If the value exceeds the set range value, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 243466DEST_PATH_IMAGE006
Or
Figure 255285DEST_PATH_IMAGE009
If the value of the range is not exceeded, determining the sleeve corresponding to the reference signal in the undetermined group, and
Figure 702053DEST_PATH_IMAGE006
or
Figure 355888DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
Fig. 3 is a schematic structural diagram of a system for on-line monitoring of converter transformer valve side bushing parameters according to a preferred embodiment of the present invention. As shown in fig. 3, the system 300 for online monitoring of the valve-side bushing parameters of the converter transformer according to the preferred embodiment includes:
the scheme setting unit 301 is configured to set a converter transformer valve side bushing selection scheme, where the selection scheme includes selecting all converter transformer valve side bushings of a set of three-phase converter transformers in the converter station, selecting all converter transformer valve side bushings of the same valve hall in the converter station with the same polarity, selecting all converter transformer valve side bushings of the same valve hall in the converter station, and selecting all converter transformer valve side bushings in the converter station.
A classification rule unit 302, configured to set a classification rule for a converter transformer valve-side bushing, where the classification rule includes: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: and classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2.
And the parameter setting unit 303 is configured to set parameter values of the converter transformer valve-side bushing to be monitored, where the parameter values include a dielectric loss factor initial value of the converter transformer valve-side bushing using the acquired signal as a reference signal, and range values of relative dielectric loss factors and capacitance ratios under each fundamental component and harmonic component of the signal acquired by the converter transformer valve-side bushing to be monitored.
And a bushing selection unit 304 for determining the converter transformer valve side bushing to be monitored according to a preset selection scheme of the converter transformer valve side bushing.
And a bushing grouping unit 305, configured to divide the converter transformer valve side bushings to be monitored into multiple categories according to preset classification rules, and determine the number of groups of converter transformer valve side bushings that meet each classification rule, and the converter transformer valve side bushings in each group.
And the signal acquisition unit 306 is configured to acquire the signal representing the leakage current of each converter transformer valve-side bushing to be monitored synchronously, and select the signal data representing the leakage current acquired in the same time period as the data to be analyzed.
Preferably, the step of synchronously acquiring the signal representing the leakage current of each converter transformer valve side bushing to be monitored by the signal acquisition unit 306 means that at least one of an output signal of a bushing end screen voltage detector, a bushing secondary end screen voltage signal, a bushing end screen leakage current signal and an output signal of a current transformer on the bushing to be monitored is synchronously acquired.
The first calculating unit 307 is configured to select data to be analyzed of any one converter transformer valve side bushing from the data to be analyzed of each group of converter transformer valve side bushings as a reference signal, use data to be analyzed of other converter transformer valve side bushings as a comparison signal, and calculate a fundamental component and a harmonic component phase angle difference between the comparison signal and the reference signal, and a signal amplitude of the comparison signal and the reference signal.
And the second calculating unit 308 is configured to determine the relative dielectric loss factor and capacitance ratio of the to-be-monitored converter transformer valve-side bushing parameter, wherein the relative dielectric loss factor of the converter transformer valve-side bushing in each group is calculated according to the phase angle difference between the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and a preset dielectric loss factor initial value, and the capacitance ratio of the converter transformer valve-side bushing in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal.
Preferably, the second calculating unit 308 calculates the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and the preset initial value of the dielectric loss factor, and calculates the capacitance ratio of the valve-side sleeve of the converter transformer in each group according to the signal amplitudes of the comparison signal and the reference signal, and the calculation formula is as follows:
Figure 456700DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure 842682DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal in grouped data to be analyzed of converter transformer valve side sleeve
Figure 419156DEST_PATH_IMAGE003
And a reference signal
Figure 735737DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure 815689DEST_PATH_IMAGE005
to be used as reference signal
Figure 310255DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure 311709DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 776188DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure 602324DEST_PATH_IMAGE007
is a reference signal
Figure 658005DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure 553280DEST_PATH_IMAGE008
as a contrast signal
Figure 87029DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure 344835DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure 164893DEST_PATH_IMAGE010
，
Figure 203256DEST_PATH_IMAGE011
，
Figure 150483DEST_PATH_IMAGE012
，
Figure 262796DEST_PATH_IMAGE013
，
Figure 394700DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure 12369DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure 153501DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure 58003DEST_PATH_IMAGE017
the highest harmonic order, the fundamental component order is 1.
And a state determination unit 309 for comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively, and determining the operation state of the monitored converter transformer valve side sleeve.
Preferably, the state determination unit 309 compares the relative dielectric loss factor and the capacitance ratio with preset range values, respectively, and determining the operation state of the converter transformer valve side sleeve to be monitored comprises:
when all are
Figure 298491DEST_PATH_IMAGE006
Or
Figure 311447DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 849744DEST_PATH_IMAGE006
Or
Figure 936649DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 144776DEST_PATH_IMAGE006
Or
Figure 989236DEST_PATH_IMAGE009
If the value exceeds the set range value, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 472170DEST_PATH_IMAGE006
Or
Figure 836417DEST_PATH_IMAGE009
If the value of the range is not exceeded, determining the sleeve corresponding to the reference signal in the undetermined group, and
Figure 684287DEST_PATH_IMAGE006
or
Figure 140677DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
The steps of the system for online monitoring the parameters of the valve side sleeve of the converter transformer for online monitoring the relative dielectric loss factor and the capacitance ratio value of the valve side sleeve of the converter transformer are the same as the steps adopted by the method for online monitoring the parameters of the valve side sleeve of the converter transformer, the technical effects are the same, and the details are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (12)

1. A method for online monitoring of converter transformer valve side bushing parameters, the method comprising:
determining a converter transformer valve side sleeve to be monitored according to a preset selection scheme of the converter transformer valve side sleeve;
dividing the converter transformer valve side sleeves to be monitored into a plurality of categories according to preset classification rules, and determining the grouping number of the converter transformer valve side sleeves according with each classification rule and the converter transformer valve side sleeves in each group;
synchronously acquiring a signal capable of representing leakage current of each converter transformer valve side sleeve to be monitored, and selecting signal data capable of representing leakage current acquired in the same time period as data to be analyzed;
selecting data to be analyzed of any converter transformer valve side sleeve from the data to be analyzed of each group of converter transformer valve side sleeves as a reference signal, taking the data to be analyzed of other converter transformer valve side sleeves as a comparison signal, and calculating fundamental component and harmonic component phase angle difference between the comparison signal and the reference signal and signal amplitude values of the comparison signal and the reference signal;
and determining the relative dielectric loss factor and capacitance ratio of the parameters of the valve side sleeve of the converter transformer to be monitored, wherein the relative dielectric loss factor of the valve side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal.
2. The method according to claim 1, wherein the step of calculating the relative dielectric loss factor of the valve-side sleeve of the converter transformer in each group according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group by using the preset initial value of the dielectric loss factor and the step of calculating the capacitance ratio of the valve-side sleeve of the converter transformer in each group according to the signal amplitudes of the comparison signal and the reference signal further comprises the step of comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively to determine the operation state of the converter transformer valve-side sleeve.
3. The method of claim 2, further comprising, prior to determining the converter transformer valve side bushing to be monitored according to a preset converter transformer valve side bushing selection scheme:
setting a selection scheme of valve side sleeves of the converter transformers, wherein the selection scheme comprises selecting all the valve side sleeves of the converter transformers of a group of three-phase converter transformers in the converter station, selecting all the valve side sleeves of the converter transformers of the same valve hall in the converter station with the same polarity, selecting all the valve side sleeves of the converter transformers of the same valve hall in the converter station and selecting all the valve side sleeves of the converter transformers in the converter station;
setting a classification rule of a converter transformer valve side sleeve, wherein the classification rule comprises the following steps: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2;
setting parameter values of the converter transformer valve side sleeve to be monitored, wherein the parameter values comprise a medium loss factor initial value of the converter transformer valve side sleeve using the acquired signal as a reference signal, and range values of relative medium loss factors and capacitance ratios under each fundamental component and harmonic component of the signal acquired by the converter transformer valve side sleeve to be monitored.
4. The method according to claim 2, wherein said synchronously acquiring the signal characterizing the leakage current of each converter transformer valve side bushing to be monitored means synchronously acquiring at least one of a bushing sub-end screen voltage signal, a bushing end screen leakage current signal and a current transformer output signal on a bushing of each converter transformer valve side bushing to be monitored.
5. The method according to claim 2, wherein the relative dielectric loss factor of the valve-side sleeves of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and the preset initial value of the dielectric loss factor, and the capacitance ratio of the valve-side sleeves of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signal and the reference signal, and the calculation formula is as follows:
Figure 15011DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal in grouped data to be analyzed of converter transformer valve side sleeve
Figure 869835DEST_PATH_IMAGE003
And a reference signal
Figure DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure 915151DEST_PATH_IMAGE005
to be used as reference signal
Figure 488125DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 240180DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure 593801DEST_PATH_IMAGE007
for referenceNumber (C)
Figure 516627DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure DEST_PATH_IMAGE008
as a contrast signal
Figure 653210DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure 853247DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure DEST_PATH_IMAGE010
，
Figure 535027DEST_PATH_IMAGE011
，
Figure DEST_PATH_IMAGE012
，
Figure 227039DEST_PATH_IMAGE013
，
Figure DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure 416581DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure 877649DEST_PATH_IMAGE017
is the highest harmonic order, fundamental componentThe number of times is 1.
6. The method of claim 5, wherein comparing the relative dielectric loss factor and capacitance ratio values to respective preset range values and determining the monitored converter transformer valve side sleeve operating condition comprises:
when all are
Figure 461821DEST_PATH_IMAGE006
Or
Figure 234605DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 916253DEST_PATH_IMAGE006
Or
Figure 294145DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 160470DEST_PATH_IMAGE006
Or
Figure 545183DEST_PATH_IMAGE009
If the value exceeds the set range value, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 420736DEST_PATH_IMAGE006
Or
Figure 325238DEST_PATH_IMAGE009
Not surpassDetermining the casing corresponding to the reference signal in the undetermined group when the set range value is obtained, and
Figure 628043DEST_PATH_IMAGE006
or
Figure 313102DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
7. A system for online monitoring of converter transformer valve side bushing parameters, the system comprising:
the sleeve selecting unit is used for determining the converter transformer valve side sleeve to be monitored according to a preset selection scheme of the converter transformer valve side sleeve;
the sleeve grouping unit is used for dividing the converter transformer valve side sleeves to be monitored into a plurality of categories according to preset classification rules, and determining the grouping number of the converter transformer valve side sleeves according with each classification rule and the converter transformer valve side sleeves in each group;
the signal acquisition unit is used for synchronously acquiring the signal representing the leakage current of each converter transformer valve side sleeve to be monitored, and selecting the signal data representing the leakage current acquired in the same time period as the data to be analyzed;
the first calculation unit is used for selecting data to be analyzed of any converter transformer valve side sleeve from the data to be analyzed of each group of converter transformer valve side sleeves as a reference signal, using the data to be analyzed of other converter transformer valve side sleeves as a comparison signal, and calculating fundamental component and harmonic component phase angle difference between the comparison signal and the reference signal and signal amplitude values of the comparison signal and the reference signal;
and the second calculating unit is used for determining the relative dielectric loss factor and capacitance ratio of the parameters of the valve side sleeve of the converter transformer to be monitored, wherein the relative dielectric loss factor of the valve side sleeve of the converter transformer in each group is calculated according to the phase angle difference of the fundamental component and the harmonic component between each group of the comparison signals and the reference signals and a preset initial value of the dielectric loss factor, and the capacitance ratio of the valve side sleeve of the converter transformer in each group is calculated according to the signal amplitudes of the comparison signals and the reference signals.
8. The system of claim 7, further comprising:
and the state determining unit is used for comparing the relative dielectric loss factor and the capacitance ratio with preset range values respectively to determine the operation state of the sleeve on the side of the converter transformer valve to be monitored.
9. The system of claim 8, further comprising:
the system comprises a scheme setting unit, a converter transformer valve side sleeve selection unit and a control unit, wherein the scheme setting unit is used for setting a converter transformer valve side sleeve selection scheme, and the selection scheme comprises the selection of all converter transformer valve side sleeves of a group of three-phase converter transformers in a converter station, the selection of all converter transformer valve side sleeves of the same valve hall in the converter station and the selection of all converter transformer valve side sleeves in the converter station;
the classification rule unit is used for setting a classification rule of the converter transformer valve side sleeve, and the classification rule comprises the following steps: a first classification rule: classifying according to whether the voltage waveforms borne by the converter transformer valve side sleeve are the same or not; a second classification rule: classifying according to whether the valve side sleeves of the converter transformers are on the same three-phase converter transformer or not; the third classification rule: classifying according to whether the valve side sleeves of the converter transformer are positioned on the network side of the converter transformer in the same phase, wherein the number of the valve side sleeves of the converter transformer in any group meeting any classification rule is not less than 2;
and the parameter setting unit is used for setting the parameter values of the converter transformer valve side sleeve to be monitored, wherein the parameter values comprise the initial value of the dielectric loss factor of the converter transformer valve side sleeve taking the acquired signal as a reference signal and the range value of the relative dielectric loss factor and capacitance ratio under each fundamental component and harmonic component of the signal acquired by the converter transformer valve side sleeve to be monitored.
10. The system according to claim 7, wherein the signal acquisition unit synchronously acquires the signal representing the leakage current of each converter transformer valve side bushing to be monitored refers to synchronously acquiring at least one of an output signal of a bushing end screen voltage detector, a bushing sub end screen voltage signal, a bushing end screen leakage current signal and an output signal of a current transformer on the bushing to be monitored.
11. The system according to claim 9, wherein the second calculating unit calculates the relative dielectric loss factor of the valve-side bushings of the converter transformer in each group according to the phase angle difference of the fundamental component and the harmonic component between the comparison signal and the reference signal of each group and the preset initial value of the dielectric loss factor, and calculates the capacitance ratio of the valve-side bushings of the converter transformer in each group according to the signal amplitudes of the comparison signal and the reference signal, and the calculation formula is as follows:
Figure 352865DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,
Figure 236507DEST_PATH_IMAGE002
is at the firstiClassification of species, firstjSelected comparison signal in grouped data to be analyzed of converter transformer valve side sleeve
Figure 851159DEST_PATH_IMAGE003
And a reference signal
Figure 820252DEST_PATH_IMAGE004
The fundamental component and harmonic component phase angle difference between,
Figure 896662DEST_PATH_IMAGE005
to be used as reference signal
Figure 103652DEST_PATH_IMAGE004
The initial value of the dielectric loss factor of the converter transformer valve side bushing,
Figure 748260DEST_PATH_IMAGE006
is as followsiClassification of species, firstjAs contrast signals in packets
Figure 345594DEST_PATH_IMAGE003
The relative dielectric loss factor of the converter transformer valve side bushing,
Figure 101061DEST_PATH_IMAGE007
is a reference signal
Figure 896979DEST_PATH_IMAGE004
The amplitude of the signal of (a) is,
Figure 335657DEST_PATH_IMAGE008
as a contrast signal
Figure 544921DEST_PATH_IMAGE003
The amplitude of the signal of (a) is,
Figure 979445DEST_PATH_IMAGE009
is the ratio of the capacitance values, wherein,i、j、kanduis a natural number, and is provided with a plurality of groups,
Figure 692186DEST_PATH_IMAGE010
，
Figure 616279DEST_PATH_IMAGE011
，
Figure 171895DEST_PATH_IMAGE012
，
Figure 534743DEST_PATH_IMAGE013
，
Figure 242936DEST_PATH_IMAGE014
for the total number of categories of converter transformer valve side bushings,
Figure 337931DEST_PATH_IMAGE015
for the number of packets in the same classification,
Figure 256208DEST_PATH_IMAGE016
the number of converter transformer valve side bushings in the same group,
Figure 48846DEST_PATH_IMAGE017
the highest harmonic order, the fundamental component order is 1.
12. The system of claim 11, wherein the state determination unit compares the relative dielectric loss tangent and the capacitance ratio with respective preset range values, and wherein determining the monitored converter transformer valve side sleeve operating state comprises:
when all are
Figure 470600DEST_PATH_IMAGE006
Or
Figure 674179DEST_PATH_IMAGE009
When the current transformer side sleeve operation states are all within the set range value, the operation states of all the current transformer side sleeve operation states are normal;
when in use
Figure 17436DEST_PATH_IMAGE006
Or
Figure 722087DEST_PATH_IMAGE009
When the value exceeds the set range, the first step is determinediFirst in classificationjGrouping into pending groups:
when the pending group has the unique signal or the pending group is not unique but the same signal does not exist in all pending groups, if all pending groups have the same signal, the pending group is determined to be the same as the signal in the pending group
Figure 654140DEST_PATH_IMAGE006
Or
Figure 153254DEST_PATH_IMAGE009
If the value exceeds the set range value, determining that the casing corresponding to the reference signal in the undetermined group is a suspected abnormal casing; if there is at least one in the pending group
Figure 983807DEST_PATH_IMAGE006
Or
Figure 101936DEST_PATH_IMAGE009
If the value of the range is not exceeded, determining the sleeve corresponding to the reference signal in the undetermined group, and
Figure 498282DEST_PATH_IMAGE006
or
Figure 57046DEST_PATH_IMAGE009
The other casings except the casing corresponding to the contrast signal which does not exceed the set range value are suspected abnormal casings, wherein the signal comprises a reference signal and a contrast signal;
when the undetermined groups are not unique and the same signal exists in 2 or more undetermined groups, all the sleeves corresponding to the same signal in the undetermined groups with the same signal are suspected abnormal sleeves.
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CN113552519A (en) * 2021-06-08 2021-10-26 中国电力科学研究院有限公司 Method and device for testing performance of casing monitoring system
CN113985139A (en) * 2021-10-15 2022-01-28 国网电力科学研究院武汉南瑞有限责任公司 Frequency domain dielectric response measuring device and method for valve side sleeve of converter transformer
CN117706943A (en) * 2024-02-06 2024-03-15 南京中鑫智电科技有限公司 Self-adaptive control method and system for converter transformer valve side sleeve end screen voltage divider

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