CN109375040A - A kind of state monitoring method, equipment and the system of H bridge capacitor group - Google Patents

A kind of state monitoring method, equipment and the system of H bridge capacitor group Download PDF

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Publication number
CN109375040A
CN109375040A CN201811526047.6A CN201811526047A CN109375040A CN 109375040 A CN109375040 A CN 109375040A CN 201811526047 A CN201811526047 A CN 201811526047A CN 109375040 A CN109375040 A CN 109375040A
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CN
China
Prior art keywords
value
per unit
current
bridge
fault
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Granted
Application number
CN201811526047.6A
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Chinese (zh)
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CN109375040B (en
Inventor
马鑫晟
彭珑
张超
赵媛
胡应宏
张静岚
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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Priority to CN201811526047.6A priority Critical patent/CN109375040B/en
Publication of CN109375040A publication Critical patent/CN109375040A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/64—Testing of capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Protection Of Static Devices (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The present invention provides state monitoring method, system, computer equipment and the computer readable storage mediums of a kind of H bridge capacitor group, are related to technical field of power systems.This method includes obtaining the maximum overvoltage value of the wiring construction information of H bridge capacitor group, the component structure information inside capacitor unit and capacitor unit；The changing value of out-of-balance current per unit value when determining that the capacitor unit internal fault parts number of the first bridge arm is k according to the wiring construction information, the component structure information and maximum overvoltage value and every out-of-balance current per unit value when increasing a fault element；Determination judges definite value, current reference and phase reference；According to out-of-balance current per unit value, changing value, judge that definite value, current reference and phase reference export the status monitoring result of the H bridge capacitor group.The present invention can effectively prevent overvoltage in capacitor operation to ensure the safe operation of capacitor beyond capacitor burst failure caused by producer's requirement.

Description

A kind of state monitoring method, equipment and the system of H bridge capacitor group
Technical field
The present invention is about technical field of power systems, especially with regard to the detection technique of power equipment in electric system, tool Body say be a kind of H bridge capacitor group state monitoring method, system, computer equipment and computer readable storage medium.
Background technique
H bridge joint line capacitor group is usually electrically being made up of H-type wiring a large amount of single capacitor units, and is furnished with Bridge difference unbalanced current protection.When any capacitor unit capacitance of series capacitor group changes, H bridge middle line will be caused On electric current change, this electric current is referred to as out-of-balance current or bridge difference out-of-balance current.Unbalanced current protection is to pass through The electric current on H bridge middle line is flowed through in detection, to judge whether break down inside capacitor unit.When generation internal fault and make When out-of-balance current meets or exceeds adjusting permissible value, unbalanced current protection will start circuit breaker trip, exit series capacitance Device group enables failure no longer to expand, series capacitor group is protected.
For traditional unbalanced current protection mode, the order of magnitude of out-of-balance current is only judged, it may occur however that two A problem: first, element is punctured in succession in the adjacent bridge arm the case where, this method, which can not make capacitor faults, effectively to be sentenced It is disconnected, cause certain bridge arm fault element number to could possibly be higher than limit value, causes other elements overvoltage failure；Second, for element phase After breakdown in diagonal bridge arm the case where, which can trip in advance when capacitor breakdown element is not up to limit value.
Therefore, a kind of new scheme how is provided, being able to solve above-mentioned technical problem is this field skill urgently to be resolved Art problem.
Summary of the invention
In view of this, the embodiment of the invention provides state monitoring method, system, the computers of a kind of H bridge capacitor group Equipment and computer readable storage medium, not by monitoring capacitor group out-of-balance current per unit value variable quantity and monitoring calculation The accumulated value of variable quantity in balanced balanced current per unit value same direction judges a certain bridge arm unit breakdown quantity of capacitor group, solves The defect that protected mode in the prior art is unable to judge accurately adjacent bridge arm or diagonal bridge arm unit successive failure, can It effectively prevent overvoltage in capacitor operation to ensure the safety of capacitor beyond capacitor burst failure caused by producer's requirement Operation.
It is an object of the invention to provide a kind of state monitoring methods of H bridge capacitor group, comprising:
Obtain the wiring construction information of H bridge capacitor group, the component structure information inside capacitor unit and capacitor The maximum overvoltage value of unit；
The electricity of the first bridge arm is determined according to the wiring construction information, the component structure information and maximum overvoltage value Container unit internal fault parts number be k when one fault element of out-of-balance current per unit value and every increase when out-of-balance current The changing value of per unit value, wherein k is fault element number；
Determination judges definite value, current reference and phase reference；
According to out-of-balance current per unit value, changing value, judge that definite value, current reference and phase reference export the H bridge The status monitoring result of capacitor group.
In a preferred embodiment of the invention, according to the wiring construction information, the component structure information and most Big overvoltage value determines out-of-balance current per unit value and every increasing when the capacitor unit internal fault parts number of the first bridge arm is k The changing value of out-of-balance current per unit value includes: when adding a fault element
The maximum failure original part number n of the first bridge arm is determined according to the maximum overvoltage value；
The capacitor list of first bridge arm is determined according to the wiring construction information and the component structure information Out-of-balance current per unit value when fault element number in member is k, wherein k is less than n；
Out-of-balance current per unit value when according to fault element number being k calculates uneven electric when one fault element of every increases Flow the changing value of per unit value.
In a preferred embodiment of the invention, the determination judges definite value, initial current benchmark and initial phase base Standard includes:
It is uneven for the moment that the parts number that is out of order is obtained in out-of-balance current per unit value when from the fault element number being k Weigh electric current per unit value；
It is that out-of-balance current size per unit value is determined to judge that definite value, the judgement definite value are small for the moment according to fault element In the fault element be out-of-balance current size per unit value for the moment；
Obtain the out-of-balance current and total current when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls；
Initial unbalance electric current per unit value is determined according to the out-of-balance current and total current and relative to total electricity The initial phase of stream；
Using the initial unbalance electric current per unit value as initial current benchmark, using initial phase as initial phase base It is quasi-.
In a preferred embodiment of the invention, it is described according to out-of-balance current per unit value, changing value, judge definite value, electricity Stream benchmark and phase reference export the status monitoring result of the H bridge capacitor group
The difference that the fault element is out-of-balance current size per unit value and the initial current benchmark for the moment is calculated, Referred to as the first difference；
When first difference is greater than the judgement definite value, the status monitoring result for exporting the H bridge capacitor group is The fault element number of first bridge arm is one, and is described in out-of-balance current per unit value replacement for the moment with the fault element Initial unbalance electric current per unit value is as current reference.
In a preferred embodiment of the invention, it is described according to out-of-balance current per unit value, changing value, judge definite value, electricity Stream benchmark and phase reference export the status monitoring result of the H bridge capacitor group further include:
The out-of-balance current and total current of the H bridge capacitor group are obtained in real time；
The phase relative to total current is determined according to the out-of-balance current and total current；
The difference of the out-of-balance current size per unit value and the current reference when fault element is two is calculated, referred to as Second difference；
When second difference is greater than the judgement definite value, judge that the phase of the total current and the initial phase are No is same direction；
When the judgment is yes, the status monitoring result for exporting the H bridge capacitor group is second of first bridge arm Element fault, the fault element number for recording first bridge arm is two, and the changing value and second when by first element fault Changing value summation when a element fault, is recorded in the accumulated value of first bridge arm.
In a preferred embodiment of the invention, it is described according to out-of-balance current per unit value, changing value, judge definite value, electricity Stream benchmark and phase reference export the status monitoring result of the H bridge capacitor group further include:
When second difference is greater than the judgement definite value, judge that the phase of the total current and the initial phase are No is opposite direction；
When the judgment is yes, it is adjacent with first bridge arm for exporting the status monitoring result of the H bridge capacitor group One element fault occurs for the second bridge arm；
The fault element number for recording second bridge arm is one；
Changing value when by second element fault is recorded in the accumulated value of second bridge arm；
It is uneven for the moment that out-of-balance current per unit value when with the fault element being two, which replaces the fault element, Electric current per unit value is as new current reference.
In a preferred embodiment of the invention, it is described according to out-of-balance current per unit value, changing value, judge definite value, electricity Stream benchmark and phase reference export the status monitoring result of the H bridge capacitor group further include:
It is ceil (n/2) that the changing value of out-of-balance current size per unit value when fault element is m, which is greater than fault element, When out-of-balance current size per unit value changing value, and when the accumulated value of first bridge arm is ceil (n/2), described in output The status monitoring result of H bridge capacitor group is alarm signal, and the fault element number for identifying first bridge arm reaches described The half of maximum failure original part number.
In a preferred embodiment of the invention, it is described according to out-of-balance current per unit value, changing value, judge definite value, electricity Stream benchmark and phase reference export the status monitoring result of the H bridge capacitor group further include:
The changing value of out-of-balance current size per unit value when fault element is m is greater than injustice when fault element is n Weigh the changing value of size of current per unit value, and the accumulated value of first bridge arm is fault element when being n, exports the H bridge electricity The status monitoring result of container group is trip signal, and the fault element number for identifying first bridge arm reaches the most die Hinder original part number, it can not longtime running.
It is an object of the invention to provide a kind of condition monitoring systems of H bridge capacitor group, comprising:
Data obtaining module, for obtaining the wiring construction information of H bridge capacitor group, the element knot inside capacitor unit The maximum overvoltage value of structure information and capacitor unit；
Current calculation module, for according to the wiring construction information, the component structure information and maximum overvoltage It is worth one event of out-of-balance current per unit value and every increase determined when the capacitor unit internal fault parts number of the first bridge arm is k The changing value of out-of-balance current per unit value when hindering element, wherein k is fault element number；
Benchmark determining module judges definite value, current reference and phase reference for determination；
State monitoring module is used for according to out-of-balance current per unit value, changing value, judges definite value, current reference and phase Position benchmark exports the status monitoring result of the H bridge capacitor group.
In a preferred embodiment of the invention, the current calculation module includes:
Limit value determining module, for determining the maximum failure original part number n of the first bridge arm according to the maximum overvoltage value；
Per unit value determining module, it is described for being determined according to the wiring construction information and the component structure information Out-of-balance current per unit value when fault element number in the capacitor unit of first bridge arm is k, wherein k is less than n；
Changing value determining module, out-of-balance current per unit value when for being k according to fault element number calculate every increase by one The changing value of out-of-balance current per unit value when a fault element.
In a preferred embodiment of the invention, the benchmark determining module includes:
First per unit value determining module, for from the fault element number be k when out-of-balance current per unit value in obtain The parts number that is out of order is out-of-balance current per unit value for the moment；
Definite value determining module is judged, for being that out-of-balance current size per unit value is determined to sentence for the moment according to fault element Conclude value, it is described to judge that definite value is less than the fault element for out-of-balance current size per unit value for the moment；
First electric current determining module, when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls for obtaining not Balanced balanced current and total current；
Initial phase determining module, for determining initial unbalance electric current according to the out-of-balance current and total current Per unit value and initial phase relative to total current；
Initial baseline determining module is used for using the initial unbalance electric current per unit value as initial current benchmark, will be first Beginning phase is as initial phase benchmark.
In a preferred embodiment of the invention, the state monitoring module includes:
First difference determining module, for calculating the fault element as out-of-balance current size per unit value for the moment and institute State the difference of initial current benchmark, referred to as the first difference；
First monitoring result output module, for exporting the H bridge when first difference is greater than the judgement definite value The status monitoring result of capacitor group is that the fault element number of first bridge arm is one, and is for the moment with the fault element Out-of-balance current per unit value replaces the initial unbalance electric current per unit value as current reference.
In a preferred embodiment of the invention, the state monitoring module further include:
Total current obtains module, for obtaining the out-of-balance current and total current of the H bridge capacitor group in real time；
Phase determination module, for determining the phase relative to total current according to the out-of-balance current and total current Position；
Second difference determining module, for calculating out-of-balance current size per unit value and institute when the fault element is two State the difference of current reference, referred to as the second difference；
Walking direction module, for judging the phase of the total current when second difference is greater than the judgement definite value Whether position and the initial phase are same direction；
Second monitoring result output module, for exporting the H bridge capacitor when the walking direction module is judged as YES The status monitoring result of device group is second element fault of first bridge arm, records the fault element number of first bridge arm It is two, and changing value summation when changing value and second element fault when by first element fault, is recorded in described the In the accumulated value of one bridge arm.
In a preferred embodiment of the invention, the state monitoring module further include:
Third monitoring result output module, for exporting the H bridge capacitor when the walking direction module is judged as NO The status monitoring result of device group is that an element fault occurs for second bridge arm adjacent with first bridge arm；
Fault logging module, the fault element number for recording second bridge arm are one, when by second element fault Changing value be recorded in the accumulated value of second bridge arm；
Datum renewal module, out-of-balance current per unit value when for being two with the fault element replace the failure member Part is out-of-balance current per unit value for the moment as current reference.
In a preferred embodiment of the invention, the state monitoring module further include:
4th monitoring result output module, the variation for the out-of-balance current size per unit value when fault element is m Value is greater than the changing value of out-of-balance current size per unit value when fault element is ceil (n/2), and first bridge arm is tired When product value is ceil (n/2), the status monitoring result for exporting the H bridge capacitor group is alarm signal, for identifying described the The fault element number of one bridge arm reaches the half of the maximum failure original part number.
In a preferred embodiment of the invention, the state monitoring module further include:
5th monitoring result output module, the variation for the out-of-balance current size per unit value when fault element is m Value is greater than the changing value of out-of-balance current size per unit value when fault element is n, and the accumulated value of first bridge arm is event When barrier element is n, the status monitoring result for exporting the H bridge capacitor group is trip signal, for identifying first bridge arm Fault element number reach the maximum failure original part number, can not longtime running.
It is an object of the invention to provide a kind of computer equipments, comprising: be adapted for carrying out each instruction processor and Equipment is stored, the storage equipment is stored with a plurality of instruction, and described instruction is suitable for being loaded by processor and executing a kind of H bridge capacitor The state monitoring method of device group.
It is an object of the invention to provide a kind of computer readable storage mediums, are stored with computer program, the meter Calculation machine program is used to execute a kind of state monitoring method of H bridge capacitor group.
The beneficial effects of the present invention are provide state monitoring method, system, the computer of a kind of H bridge capacitor group Equipment and computer readable storage medium, not by monitoring capacitor group out-of-balance current per unit value variable quantity and monitoring calculation The accumulated value of variable quantity in balanced balanced current per unit value same direction judges a certain bridge arm unit breakdown quantity of capacitor group, solves The defect that protected mode in the prior art is unable to judge accurately adjacent bridge arm or diagonal bridge arm unit successive failure, can It effectively prevent overvoltage in capacitor operation to ensure the safety of capacitor beyond capacitor burst failure caused by producer's requirement Operation.
For above and other objects, features and advantages of the invention can be clearer and more comprehensible, preferred embodiment is cited below particularly, And cooperate institute's accompanying drawings, it is described in detail below.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of the condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention；
Fig. 2 is current calculation module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention Structural schematic diagram；
Fig. 3 is benchmark determining module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention Structural schematic diagram；
Fig. 4 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment one；
Fig. 5 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment two；
Fig. 6 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment three；
Fig. 7 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment four；
Fig. 8 is a kind of flow chart of the state monitoring method of H bridge capacitor group provided in an embodiment of the present invention；
Fig. 9 is the specific flow chart of the step S102 in Fig. 8；
Figure 10 is the specific flow chart of the step S103 in Fig. 8；
Figure 11 is the specific flow chart of the embodiment one of the step S104 in Fig. 8；
Figure 12 is the specific flow chart of the embodiment two of the step S104 in Fig. 8；
Figure 13 is the specific flow chart of the embodiment three of the step S104 in Fig. 8；
Figure 14 is the specific flow chart of the embodiment four of the step S104 in Fig. 8；
Figure 15 is H bridge capacitor schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Those skilled in the art will understand that embodiments of the present invention can be implemented as a kind of system, device, method or Computer program product.Therefore, disclose can be with specific implementation is as follows by the present invention, it may be assumed that complete hardware, complete software The form that (including firmware, resident software, microcode etc.) or hardware and software combine.
Below with reference to several representative embodiments of the invention, the principle and spirit of the present invention are explained in detail.
In order to overcome the drawbacks described above in the prior art, the invention proposes based on uneven after more each component breakdown The H bridge capacitor status monitoring scheme of weighing apparatus current amplitude and phase changing capacity, the former protected mode of solution is to adjacent bridge arm or diagonally The defect that bridge arm unit successive failure is unable to judge accurately.
Figure 15 is the schematic diagram of H bridge capacitor in one embodiment, calculates and emulates the present invention is based on following two Obtained conclusion:
(1) no matter fault element is Continuous Breakdown in a bridge arm, or breakdown is in different bridge arms in succession, when puncturing The variable quantity of out-of-balance current is only dependent upon the total failare parts number of that bridge arm punctured.
(2) it sums to the out-of-balance current value variable quantity in one direction of some bridge arm, is equal to a capacitor list The total changing value of out-of-balance current in member under Continuous Breakdown similar elements, so may determine that shared in a capacitor unit it is several Failure has occurred in a element.The per unit value being mentioned below only with H bridge capacitor group total current INRatio.
Fig. 1 is a kind of structural schematic diagram of the condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention, please be joined See that Fig. 1, the condition monitoring system of the H bridge capacitor group include:
Data obtaining module 100, for obtaining the wiring construction information of H bridge capacitor group, the member inside capacitor unit The maximum overvoltage value of part structural information and capacitor unit.
In the specific embodiment of the application, by taking the H bridge capacitor group of certain 500kV series compensation device as an example.The string Mend the H bridge capacitor group of device using 10 strings 20 and structure, using two and the fancy mode of connection (the i.e. H bridge capacitor gone here and there again The wiring construction information of group).Capacitor unit internal element structure is 19 and 4 strings.
Current calculation module 200, for according to the wiring construction information, the component structure information and most greater than electricity Pressure value determines out-of-balance current per unit value and every increase by one when the capacitor unit internal fault parts number of the first bridge arm is k The changing value of out-of-balance current per unit value when fault element, wherein k is fault element number.Fig. 2 is the structure of current calculation module Schematic diagram.
Benchmark determining module 300 judges definite value, current reference and phase reference for determination.Mould is determined on the basis of Fig. 3 The structural schematic diagram of block.
State monitoring module 400, for according to out-of-balance current per unit value, changing value, judge definite value, current reference and Phase reference exports the status monitoring result of the H bridge capacitor group.Fig. 4 is the structural schematic diagram of state monitoring module.
Fig. 2 is current calculation module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention Structural schematic diagram, referring to Fig. 2, current calculation module 200 includes:
Limit value determining module 201, for determining the maximum failure original part number of the first bridge arm according to the maximum overvoltage value n。
Per unit value determining module 202, for being determined according to the wiring construction information and the component structure information Out-of-balance current per unit value when fault element number in the capacitor unit of first bridge arm is k, wherein k is less than n.
In the particular embodiment, out-of-balance current per unit value when fault element number is k passes through Iun_B(k) it indicates.
Changing value determining module 203, out-of-balance current per unit value when for being k according to fault element number calculate every increase The changing value of out-of-balance current per unit value when one fault element.
In the particular embodiment, the changing value of out-of-balance current per unit value passes through when one fault element of every increase dIun_B(k) it indicates.
In one particular embodiment of the present invention, by taking certain 500kV series compensation device H bridge capacitor group as an example.The string is mended Device capacitor group using 10 strings 20 and structure, using two and the fancy mode of connection gone here and there again.Capacitor unit internal element Structure is 19 and 4 strings.Capacitor unit voltage rating 6.168kV, rated capacity 740kVar.
Element Continuous Breakdown in one capacitor unit of the first bridge arm of the series compensation device can be calculated according to information above When out-of-balance current size per unit value Iun_B(k), wherein k is that the relationship of fault element number is as shown in table 1.
Table 1
It is according to table 1, and according to the maximum allowable long-time overvoltage value of capacitor unit that capacitor producer provides 1.5Un obtains maximum fault element number n=8.
Fig. 3 is benchmark determining module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention Structural schematic diagram, from the figure 3, it may be seen that the benchmark determining module 300 includes:
First per unit value determining module 301, for from the fault element number be k when out-of-balance current per unit value in obtain Fault element number is taken out as out-of-balance current per unit value for the moment, in the embodiment shown in table 1, obtaining the parts number that is out of order is Out-of-balance current per unit value is -0.0069% for the moment.
Definite value determining module 302 is judged, for determining according to fault element for out-of-balance current size per unit value for the moment Definite value is judged out, it is described to judge that definite value is less than the fault element for out-of-balance current size per unit value for the moment.Specific In embodiment, out-of-balance current per unit value smaller when definite value is set as than first component breakdown is judged.
In 1 the embodiment described of table, fault element number is that out-of-balance current per unit value is -0.0069% for the moment, really The judgement definite value made all for example 0.006%.
First electric current determining module 303, when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls for obtaining Out-of-balance current and total current；
Initial phase determining module 304, for determining initial unbalance according to the out-of-balance current and total current Electric current per unit value and initial phase relative to total current；
Initial baseline determining module 305 is used for using the initial unbalance electric current per unit value as initial current benchmark, will Initial phase is as initial phase benchmark.
Fig. 4 is the state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention Embodiment one structural schematic diagram, referring to Fig. 4, the state monitoring module 400 includes: in embodiment 1
First difference determining module 401, for calculating the fault element as out-of-balance current size per unit value for the moment With the difference of the initial current benchmark, referred to as the first difference；
First monitoring result output module 402 is used for when first difference is greater than the judgement definite value, described in output The status monitoring result of H bridge capacitor group is that the fault element number of first bridge arm is one；
Per unit value replacement module 403, for being described in out-of-balance current per unit value replacement for the moment with the fault element Initial unbalance electric current per unit value is as current reference.
In the particular embodiment, the first bridge arm A1 fault element number K is recordedA1=1.
Fig. 5 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment two, referring to Fig. 5, preferably state detection module in two further include:
Total current obtains module 404, for obtaining the out-of-balance current and total current of the H bridge capacitor group in real time.
The out-of-balance current and total current obtained refers to H bridge capacitor group operation a period of time herein after, it is different from Out-of-balance current and total electricity when the H bridge capacitor group that first electric current determining module obtains puts into operation for the first time after just putting into operation or overhaul Stream.
Phase determination module 405, for being determined according to the out-of-balance current and total current relative to total current Phase；
Second difference determining module 406, for calculating the out-of-balance current size per unit value when fault element is two With the difference of the current reference, referred to as the second difference；
Walking direction module 407, for judging the total current when second difference is greater than the judgement definite value Whether phase and the initial phase are same direction；
Second monitoring result output module 408, for exporting the H bridge when the walking direction module is judged as YES The status monitoring result of capacitor group is second element fault of first bridge arm, records the failure member of first bridge arm Number of packages is two, and changing value summation when changing value and second element fault when by first element fault, is recorded in institute In the accumulated value for stating the first bridge arm.
In the particular embodiment, the first bridge arm A1 fault element number K is recordedA1=2, change when by first element fault Changing value summation when change value and second element fault is recorded in the accumulated value SUM of the first bridge arm A1A1In.
Fig. 6 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment three, referring to Fig. 6, in the third embodiment, state detection module further include:
Third monitoring result output module 409, for exporting the H bridge when the walking direction module is judged as NO The status monitoring result of capacitor group is that an element fault occurs for second bridge arm adjacent with first bridge arm；
Fault logging module 410, the fault element number for recording second bridge arm is one, by second element fault When changing value be recorded in the accumulated value of second bridge arm；
Datum renewal module 411, out-of-balance current per unit value replacement event when for being two with the fault element Hindering element is out-of-balance current per unit value for the moment as current reference.
In the particular embodiment, the second bridge arm A2 fault element number K is recordedA2=1, change when by second element fault The accumulated value that change value is recorded in second bridge arm is recorded in the accumulated value SUM of the second bridge arm A2A2In.
Fig. 7 is state monitoring module in a kind of condition monitoring system of H bridge capacitor group provided in an embodiment of the present invention The structural schematic diagram of embodiment four, referring to Fig. 7, state detection module is in the fourth embodiment further include:
4th monitoring result output module 412, the change for the out-of-balance current size per unit value when fault element is m Change value is greater than the changing value of out-of-balance current size per unit value when fault element is ceil (n/2), and first bridge arm When accumulated value is ceil (n/2), the status monitoring result for exporting the H bridge capacitor group is alarm signal, described for identifying The fault element number of first bridge arm reaches the half of the maximum failure original part number.
In the particular embodiment, i.e. Iun_B(m)>Iun_B(ceil (n/2)) and SUMAxWhen=ceil (n/2), output is accused Alert signal.X herein is specific bridge arm, such as the first bridge arm, that is, X=1.
5th monitoring result output module 413, the change for the out-of-balance current size per unit value when fault element is m Change value is greater than the changing value of out-of-balance current size per unit value when fault element is n, and the accumulated value of first bridge arm is When fault element is n, the status monitoring result for exporting the H bridge capacitor group is trip signal, for identifying first bridge The fault element number of arm reaches the maximum failure original part number, can not longtime running.
In the particular embodiment, i.e. Iun_B(m)>Iun_B(n) and SUMAxWhen=n, trip signal is exported.X herein is Specific bridge arm, such as the first bridge arm, that is, X=1.
As above it is a kind of condition monitoring system of H bridge capacitor group provided by the invention, solves in the prior art The defect that protected mode is unable to judge accurately adjacent bridge arm or diagonal bridge arm unit successive failure, can effectively prevent capacitor Capacitor burst failure, has ensured the safe operation of capacitor caused by overvoltage is required beyond producer in operation.
In addition, although being referred to several unit modules of system in the above detailed description, it is this to divide only simultaneously Non-imposed.In fact, embodiment according to the present invention, the feature and function of two or more above-described units can To embody in a unit.Equally, the feature and function of an above-described unit can also be served as reasons with further division Multiple units embody.Terms used above " module " and " unit ", can be realize predetermined function software and/or Hardware.Although module described in following embodiment is preferably realized with software, the group of hardware or software and hardware The realization of conjunction is also that may and be contemplated.
After describing the condition monitoring system of H bridge capacitor group of exemplary embodiment of the invention, next, ginseng Attached drawing is examined the method for exemplary embodiment of the invention is introduced.The implementation of this method may refer to above-mentioned whole reality It applies, overlaps will not be repeated.
Fig. 8 is a kind of flow diagram of the state monitoring method of H bridge capacitor group provided in an embodiment of the present invention, please be joined See Fig. 8, this method comprises:
S101: the wiring construction information of H bridge capacitor group, the component structure information inside capacitor unit and electricity are obtained The maximum overvoltage value of container unit.
In the specific embodiment of the application, by taking the H bridge capacitor group of certain 500kV series compensation device as an example.The string Mend the H bridge capacitor group of device using 10 strings 20 and structure, using two and the fancy mode of connection (the i.e. H bridge capacitor gone here and there again The wiring construction information of group).Capacitor unit internal element structure is 19 and 4 strings.
S102: the first bridge is determined according to the wiring construction information, the component structure information and maximum overvoltage value The capacitor unit internal fault parts number of arm be k when one fault element of out-of-balance current per unit value and every increases when injustice The changing value of weighing apparatus electric current per unit value, wherein k is fault element number.Fig. 9 is the specific flow chart of the step.
S103: determination judges definite value, current reference and phase reference.Figure 10 is the specific flow chart of the step.
S104: according to out-of-balance current per unit value, changing value, judge that definite value, current reference and phase reference export institute State the status monitoring result of H bridge capacitor group.Figure 11 is the specific flow chart of the step.
Fig. 9 is the specific flow chart of step S102, referring to Fig. 9, the step includes:
S201: the maximum failure original part number n of the first bridge arm is determined according to the maximum overvoltage value.
S202: the capacitor of first bridge arm is determined according to the wiring construction information and the component structure information Out-of-balance current per unit value when fault element number in device unit is k, wherein k is less than n.
In the particular embodiment, out-of-balance current per unit value when fault element number is k passes through Iun_B(k) it indicates.
S203: according to fault element number be k when out-of-balance current per unit value calculate one fault element of every increase when not The changing value of balanced balanced current per unit value.
In the particular embodiment, the changing value of out-of-balance current per unit value passes through when one fault element of every increase dIun_B(k) it indicates.
In one particular embodiment of the present invention, by taking certain 500kV series compensation device H bridge capacitor group as an example.The string is mended Device capacitor group using 10 strings 20 and structure, using two and the fancy mode of connection gone here and there again.Capacitor unit internal element Structure is 19 and 4 strings.Capacitor unit voltage rating 6.168kV, rated capacity 740kVar.
Element Continuous Breakdown in one capacitor unit of the first bridge arm of the series compensation device can be calculated according to information above When out-of-balance current size per unit value Iun_B(k), wherein k is that the relationship of fault element number is as shown in table 1.
It is according to table 1, and according to the maximum allowable long-time overvoltage value of capacitor unit that capacitor producer provides 1.5Un obtains maximum fault element number n=8.
Figure 10 is the specific flow chart of step S103, referring to Fig. 10, the step includes:
S301: it is for the moment that the parts number that is out of order is obtained in out-of-balance current per unit value when from the fault element number being k Out-of-balance current per unit value, in the embodiment shown in table 1, the acquisition parts number that is out of order is out-of-balance current mark for the moment Value is -0.0069%.
S302: being that out-of-balance current size per unit value is determined to judge definite value, the judgement for the moment according to fault element Definite value is less than the fault element for out-of-balance current size per unit value for the moment.In a particular embodiment, judge definite value Smaller out-of-balance current per unit value when being set as than first component breakdown.
In 1 the embodiment described of table, fault element number is that out-of-balance current per unit value is -0.0069% for the moment, really The judgement definite value made all for example 0.006%.
S303: the out-of-balance current and total electricity when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls are obtained Stream；
S304: according to the out-of-balance current and total current determine initial unbalance electric current per unit value and relative to The initial phase of total current；
S305: using the initial unbalance electric current per unit value as initial current benchmark, using initial phase as initial phase Position benchmark.
Figure 11 is the flow diagram of the embodiment one of step S104, please refers to Figure 11, the step is in embodiment one In include:
S401: the fault element is calculated as out-of-balance current size per unit value for the moment and the initial current benchmark Difference, referred to as the first difference；
S402: when first difference is greater than the judgement definite value, the status monitoring knot of the H bridge capacitor group is exported Fruit is that the fault element number of first bridge arm is one；
S403: being that out-of-balance current per unit value replaces the initial unbalance electric current mark for the moment with the fault element Value is used as current reference.
In the particular embodiment, the first bridge arm A1 fault element number K is recordedA1=1.
Figure 12 is the flow diagram of the embodiment two of step S104, please refers to Figure 11, preferably should in two Step further include:
S501: the out-of-balance current and total current of the H bridge capacitor group are obtained in real time.
The out-of-balance current and total current obtained refers to H bridge capacitor group operation a period of time herein after, it is different from Out-of-balance current and total electricity when the H bridge capacitor group that first electric current determining module obtains puts into operation for the first time after just putting into operation or overhaul Stream.
S502: the phase relative to total current is determined according to the out-of-balance current and total current；
S503: the difference of the out-of-balance current size per unit value and the current reference when fault element is two is calculated Value, referred to as the second difference；
S504: when second difference be greater than the judgement definite value when, judge the total current phase and it is described initially Whether phase is same direction；
S505: when the walking direction module is judged as YES, the status monitoring result for exporting the H bridge capacitor group is Second element fault of first bridge arm, the fault element number for recording first bridge arm is two, and by first element Changing value summation when changing value and second element fault when failure, is recorded in the accumulated value of first bridge arm.
In the particular embodiment, the first bridge arm A1 fault element number K is recordedA1=2, change when by first element fault Changing value summation when change value and second element fault is recorded in the accumulated value SUM of the first bridge arm A1A1In.
Figure 13 is the flow diagram of the embodiment three of step S104, please refers to Figure 13, in the third embodiment the step Suddenly further include:
S601: when second difference be greater than the judgement definite value when, judge the total current phase and it is described initially Whether phase is opposite direction；
S602: when the judgment is yes, the status monitoring result for exporting the H bridge capacitor group is and the first bridge arm phase One element fault occurs for the second adjacent bridge arm；
S603: the fault element number for recording second bridge arm is one；
S604: changing value when by second element fault is recorded in the accumulated value of second bridge arm；
S605: it is not for the moment not that out-of-balance current per unit value when with the fault element being two, which replaces the fault element, Balanced balanced current per unit value is as current reference.
In the particular embodiment, the second bridge arm A2 fault element number K is recordedA2=1, change when by second element fault The accumulated value that change value is recorded in second bridge arm is recorded in the accumulated value SUM of the second bridge arm A2A2In.
Figure 14 is the flow diagram of the embodiment four of step S104, please refers to Figure 14, the step is in embodiment four In further include:
S701: it is ceil that the changing value of the out-of-balance current size per unit value when fault element is m, which is greater than fault element, (n/2) changing value of out-of-balance current size per unit value when, and the accumulated value of first bridge arm be ceil (n/2) when, it is defeated The status monitoring result of the H bridge capacitor group is alarm signal out, and the fault element number for identifying first bridge arm reaches To the half of the maximum failure original part number.
In the particular embodiment, i.e. Iun_B(m)>Iun_B(ceil (n/2)) and SUMAxWhen=ceil (n/2), output is accused Alert signal.X herein is specific bridge arm, such as the first bridge arm, that is, X=1.
S702: the changing value of the out-of-balance current size per unit value when fault element is m is greater than when fault element is n The changing value of out-of-balance current size per unit value, and the accumulated value of first bridge arm is fault element when being n, exports the H The status monitoring result of bridge capacitor group is trip signal, the fault element number for identifying first bridge arm reach it is described most Major break down original part number, can not longtime running.
In the particular embodiment, i.e. Iun_B(m)>Iun_B(n) and SUMAxWhen=n, trip signal is exported.X herein is Specific bridge arm, such as the first bridge arm, that is, X=1.
The present invention also provides a kind of computer equipments, comprising: it is adapted for carrying out the processor and storage equipment of each instruction, The storage equipment is stored with a plurality of instruction, and described instruction is suitable for being loaded by processor and being executed a kind of shape of H bridge capacitor group State monitoring method.
The present invention also provides a kind of computer readable storage mediums, are stored with computer program, the computer program For executing a kind of state monitoring method of H bridge capacitor group.
In conclusion the present invention provides a kind of state monitoring method of H bridge capacitor group, system, computer equipment with And computer readable storage medium, solve protected mode in the prior art to adjacent bridge arm or the event in succession of diagonal bridge arm unit Hinder the defect being unable to judge accurately, overvoltage in capacitor operation can be effectively prevent quick-fried beyond capacitor caused by producer's requirement Failure is split, has ensured the safe operation of capacitor.
Below with reference to specific embodiment, technical solution of the present invention is discussed in detail.
The evaluation method is carried out quantization explanation by taking certain 500kV series compensation device H bridge capacitor group as an example by the embodiment. The series compensation device capacitor unit using 10 strings 20 and structure, using two and the fancy mode of connection gone here and there again.Capacitor unit Internal element structure is 19 and 4 strings.Capacitor unit voltage rating 6.168kV, rated capacity 740kVar.
When can calculate element Continuous Breakdown in 1 one capacitor units of the series compensation device bridge arm according to information above not Balanced balanced current size per unit value Iun_B(k), wherein k is that the relationship of fault element number is as shown in table 1.
Conclusion is calculated according to the meter, and according to the maximum allowable long-time overvoltage of capacitor unit that capacitor producer provides For 1.5Un, it can be deduced that maximum fault element number n=8.Judge injustice smaller when definite value is set as than first component breakdown Weigh electric current per unit value, can use 0.006%.
And then according to this method, the variable quantity of real-time judge out-of-balance current per unit value, by each same direction variable quantity Numerical value greater than 0.006% is stored, and accumulative summation.
When the variable quantity in certain out-of-balance current per unit value a direction is greater than 0.009%, and tire out in this direction at this time When counting summing value greater than 0.03%, judges that breakdown faults occur for 4 elements of a certain bridge arm, issue alarm signal at this time.
When the variable quantity in certain out-of-balance current per unit value a direction is greater than 0.014%, and tire out in this direction at this time When counting summing value greater than 0.08%, judges that breakdown faults occur for 8 elements of a certain bridge arm, issue trip signal at this time.
As above, the present invention passes through monitoring capacitor group out-of-balance current per unit value variable quantity and monitoring calculation out-of-balance current The accumulated value of variable quantity in per unit value same direction judges a certain bridge arm unit breakdown quantity of capacitor group, solves former protection The defect that mode is unable to judge accurately adjacent bridge arm or diagonal bridge arm unit successive failure, can effectively prevent capacitor to run Capacitor burst failure, has ensured the safe operation of capacitor device caused by middle overvoltage is required beyond producer.
It is improvement on hardware (for example, to diode, crystal that the improvement of one technology, which can be distinguished clearly, Pipe, switch etc. circuit structures improvement) or software on improvement (improvement for method flow).However, with technology The improvement of development, current many method flows can be considered as directly improving for hardware circuit.Designer is almost All corresponding hardware circuit is obtained by the way that improved method flow to be programmed into hardware circuit.Therefore, it cannot be said that one The improvement of a method flow cannot be realized with hardware entities module.For example, programmable logic device (Programmable Logic Device, PLD) (such as field programmable gate array (Field Programmable Gate Array, FPGA)) just It is such a integrated circuit, logic function determines device programming by user.It is voluntarily programmed by designer Lai one Dedicated integrated circuit is designed without asking chip maker and made to a digital display circuit " integrated " on a piece of PLD Chip.Moreover, nowadays, substitution manually makes IC chip, and " logic compiler (logic is also used in this programming instead mostly Compiler) " software realizes that when it writes with program development software compiler used is similar, and before compiling Also handy specific programming language is write for source code, this is referred to as hardware description language (Hardware Description Language, HDL), and HDL is also not only a kind of, but there are many kinds, such as ABEL (Advanced Boolean Expression Language)、AHDL(Altera Hardware Description Language)、Confluence、 CUPL(Cornell University Programming Language)、HDCal、JHDL(Java Hardware Description Language)、Lava、Lola、MyHDL、PALASM、RHDL(Ruby Hardware Description Language) etc., VHDL (Very-High-Speed Integrated Circuit is most generally used at present Hardware Description Language) and Verilog2.Those skilled in the art also will be apparent to the skilled artisan that only needs will be square Method process slightly programming in logic and is programmed into integrated circuit with above-mentioned several hardware description languages, so that it may be readily available reality The now hardware circuit of the logical method process.
Controller can be implemented in any suitable manner, for example, controller can take such as microprocessor or processing The computer for the computer readable program code (such as software or firmware) that device and storage can be executed by (micro-) processor can Read medium, logic gate, switch, specific integrated circuit (Application Specific Integrated Circuit, ASIC), the form of programmable logic controller (PLC) and insertion microcontroller, the example of controller includes but is not limited to following microcontroller Device: ARC625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicone Labs C8051F320 are deposited Memory controller is also implemented as a part of the control logic of memory.
It is also known in the art that other than realizing controller in a manner of pure computer readable program code, it is complete Entirely can by by method and step carry out programming in logic come so that controller with logic gate, switch, specific integrated circuit, programmable Logic controller realizes identical function with the form for being embedded in microcontroller etc..Therefore this controller is considered one kind Hardware component, and the structure that the device for realizing various functions for including in it can also be considered as in hardware component.Or Even, can will be considered as realizing the device of various functions either the software module of implementation method can be Hardware Subdivision again Structure in part.
System, device, module or the unit that above-described embodiment illustrates can specifically realize by computer chip or entity, Or it is realized by the product with certain function.
For convenience of description, it is divided into various units when description apparatus above with function to describe respectively.Certainly, implementing this The function of each unit can be realized in the same or multiple software and or hardware when application.
As seen through the above description of the embodiments, those skilled in the art can be understood that the application can It realizes by means of software and necessary general hardware platform.Based on this understanding, the technical solution essence of the application On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer system (can be personal computer, server or network system etc.) executes the certain of each embodiment of the application or embodiment Method described in part.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method Part explanation.
The application can be used in numerous general or special purpose computing system environments or configuration.Such as: personal computer, clothes Business device computer, hand system or portable system, plate system, multicomputer system, microprocessor-based system, set Top box, programmable consumer electronics system, network PC, minicomputer, mainframe computer including any of the above system or system Distributed computing environment etc..
The application can describe in the general context of computer-executable instructions executed by a computer, such as program Module.Generally, program module includes routines performing specific tasks or implementing specific abstract data types, programs, objects, group Part, data structure etc..The application can also be practiced in a distributed computing environment, in these distributed computing environments, by Task is executed by the connected teleprocessing system of communication network.In a distributed computing environment, program module can be with In the local and remote computer storage media including storage system.
Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application there are many deformation and Variation is without departing from spirit herein, it is desirable to which the attached claims include these deformations and change without departing from the application's Spirit.

Claims (18)

1. a kind of state monitoring method of H bridge capacitor group, which is characterized in that the described method includes:
Obtain the wiring construction information of H bridge capacitor group, the component structure information inside capacitor unit and capacitor unit Maximum overvoltage value；
The capacitor of the first bridge arm is determined according to the wiring construction information, the component structure information and maximum overvoltage value Unit internal fault parts number be k when one fault element of out-of-balance current per unit value and every increase when out-of-balance current mark The changing value of value, wherein k is fault element number；
Determination judges definite value, current reference and phase reference；
According to out-of-balance current per unit value, changing value, judge that definite value, current reference and phase reference export the H bridge capacitor The status monitoring result of device group.
2. the method according to claim 1, wherein being believed according to the wiring construction information, the component structure Breath and maximum overvoltage value determine the out-of-balance current per unit value when capacitor unit internal fault parts number of the first bridge arm is k And the changing value of out-of-balance current per unit value includes: when one fault element of every increase
The maximum failure original part number n of the first bridge arm is determined according to the maximum overvoltage value；
It is determined in the capacitor unit of first bridge arm according to the wiring construction information and the component structure information Fault element number be k when out-of-balance current per unit value, wherein k be less than n；
According to fault element number be k when out-of-balance current per unit value calculate one fault element of every increase when out-of-balance current mark The changing value of value.
3. according to the method described in claim 2, it is characterized in that, the determination judge definite value, initial current benchmark and just Beginning phase reference includes:
It is uneven electricity for the moment that the parts number that is out of order is obtained in out-of-balance current per unit value when from the fault element number being k Flow per unit value；
It is that out-of-balance current size per unit value is determined to judge that definite value, the judgement definite value are less than institute for the moment according to fault element Fault element is stated as out-of-balance current size per unit value for the moment；
Obtain the out-of-balance current and total current when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls；
Initial unbalance electric current per unit value is determined according to the out-of-balance current and total current and relative to total current Initial phase；
Using the initial unbalance electric current per unit value as initial current benchmark, using initial phase as initial phase benchmark.
4. according to the method described in claim 3, it is characterized in that, described according to out-of-balance current per unit value, changing value, judgement The status monitoring result that definite value, current reference and phase reference export the H bridge capacitor group includes:
The difference that the fault element is out-of-balance current size per unit value and the initial current benchmark for the moment is calculated, referred to as First difference；
When first difference is greater than the judgement definite value, it is described for exporting the status monitoring result of the H bridge capacitor group The fault element number of first bridge arm is one, and is that the replacement of out-of-balance current per unit value is described initial for the moment with the fault element Out-of-balance current per unit value is as current reference.
5. according to the method described in claim 4, it is characterized in that, described according to out-of-balance current per unit value, changing value, judgement Definite value, current reference and phase reference export the status monitoring result of the H bridge capacitor group further include:
The out-of-balance current and total current of the H bridge capacitor group are obtained in real time；
The phase relative to total current is determined according to the out-of-balance current and total current；
Calculate the fault element be two when out-of-balance current size per unit value and the current reference difference, referred to as second Difference；
When second difference is greater than the judgement definite value, judge the phase of the total current and the initial phase whether be Same direction；
When the judgment is yes, the status monitoring result for exporting the H bridge capacitor group is second element of first bridge arm Failure, the fault element number for recording first bridge arm is two, and changing value and second member when by first element fault Changing value summation when part failure, is recorded in the accumulated value of first bridge arm.
6. according to the method described in claim 5, it is characterized in that, described according to out-of-balance current per unit value, changing value, judgement Definite value, current reference and phase reference export the status monitoring result of the H bridge capacitor group further include:
When second difference is greater than the judgement definite value, judge the phase of the total current and the initial phase whether be Opposite direction；
When the judgment is yes, the status monitoring result for exporting the H bridge capacitor group is adjacent with first bridge arm second One element fault occurs for bridge arm；
The fault element number for recording second bridge arm is one；
Changing value when by second element fault is recorded in the accumulated value of second bridge arm；
It is out-of-balance current for the moment that out-of-balance current per unit value when with the fault element being two, which replaces the fault element, Per unit value is as new current reference.
7. according to the method described in claim 6, it is characterized in that, described according to out-of-balance current per unit value, changing value, judgement Definite value, current reference and phase reference export the status monitoring result of the H bridge capacitor group further include:
The changing value of out-of-balance current size per unit value when fault element is m is greater than when fault element is ceil (n/2) The changing value of out-of-balance current size per unit value, and the accumulated value of first bridge arm be ceil (n/2) when, export the H bridge The status monitoring result of capacitor group is alarm signal, and the fault element number for identifying first bridge arm reaches the maximum The half of failure original part number.
8. the method according to the description of claim 7 is characterized in that described according to out-of-balance current per unit value, changing value, judgement Definite value, current reference and phase reference export the status monitoring result of the H bridge capacitor group further include:
The changing value of out-of-balance current size per unit value when fault element is m is greater than imbalance electricity when fault element is n The changing value of size per unit value is flowed, and the accumulated value of first bridge arm is fault element when being n, exports the H bridge capacitor The status monitoring result of group is trip signal, and it is former that the fault element number for identifying first bridge arm reaches the maximum failure Number of packages, can not longtime running.
9. a kind of condition monitoring system of H bridge capacitor group, which is characterized in that the system comprises:
Data obtaining module, for obtaining the wiring construction information of H bridge capacitor group, the component structure letter inside capacitor unit The maximum overvoltage value of breath and capacitor unit；
Current calculation module, for true according to the wiring construction information, the component structure information and maximum overvoltage value One failure member of out-of-balance current per unit value and every increase when the capacitor unit internal fault parts number of fixed first bridge arm is k The changing value of out-of-balance current per unit value when part, wherein k is fault element number；
Benchmark determining module judges definite value, current reference and phase reference for determination；
State monitoring module is used for according to out-of-balance current per unit value, changing value, judges definite value, current reference and phase base Standard exports the status monitoring result of the H bridge capacitor group.
10. system according to claim 9, which is characterized in that the current calculation module includes:
Limit value determining module, for determining the maximum failure original part number n of the first bridge arm according to the maximum overvoltage value；
Per unit value determining module, for determining described first according to the wiring construction information and the component structure information Out-of-balance current per unit value when fault element number in the capacitor unit of bridge arm is k, wherein k is less than n；
Changing value determining module, out-of-balance current per unit value when for being k according to fault element number calculate one event of every increase The changing value of out-of-balance current per unit value when hindering element.
11. system according to claim 10, which is characterized in that the benchmark determining module includes:
First per unit value determining module, for from the fault element number be k when out-of-balance current per unit value in obtain out therefore Hinder parts number for out-of-balance current per unit value for the moment；
Definite value determining module is judged, for being that out-of-balance current size per unit value determines that judgement is fixed for the moment according to fault element Value, it is described to judge that definite value is less than the fault element for out-of-balance current size per unit value for the moment；
First electric current determining module, for obtaining imbalance when putting into operation for the first time after the H bridge capacitor group just puts into operation or overhauls Electric current and total current；
Initial phase determining module, for determining initial unbalance electric current mark according to the out-of-balance current and total current Value and relative to total current initial phase；
Initial baseline determining module is used for using the initial unbalance electric current per unit value as initial current benchmark, by initial phase Position is used as initial phase benchmark.
12. system according to claim 11, which is characterized in that the state monitoring module includes:
First difference determining module, for calculate the fault element be for the moment out-of-balance current size per unit value and it is described just The difference of beginning current reference, referred to as the first difference；
First monitoring result output module, for exporting the H bridge capacitor when first difference is greater than the judgement definite value The status monitoring result of device group is that the fault element number of first bridge arm is one；
Per unit value replacement module, for being that out-of-balance current per unit value replaces the initial injustice for the moment with the fault element Electric current per unit value weigh as current reference.
13. system according to claim 12, which is characterized in that the state monitoring module further include:
Total current obtains module, for obtaining the out-of-balance current and total current of the H bridge capacitor group in real time；
Phase determination module, for determining the phase relative to total current according to the out-of-balance current and total current；
Second difference determining module, for calculating out-of-balance current size per unit value and the electricity when fault element is two Flow the difference of benchmark, referred to as the second difference；
Walking direction module, for when second difference be greater than the judgement definite value when, judge the total current phase and Whether the initial phase is same direction；
Second monitoring result output module, for exporting the H bridge capacitor group when the walking direction module is judged as YES Status monitoring result be first bridge arm second element fault, the fault element number for recording first bridge arm is Two, and changing value summation when changing value and second element fault when by first element fault, it is recorded in described first In the accumulated value of bridge arm.
14. system according to claim 13, which is characterized in that the state monitoring module further include:
Third monitoring result output module, for exporting the H bridge capacitor group when the walking direction module is judged as NO Status monitoring result be that an element fault occurs for second bridge arm adjacent with first bridge arm；
Fault logging module, the fault element number for recording second bridge arm are one, change when by second element fault Change value is recorded in the accumulated value of second bridge arm；
Datum renewal module, out-of-balance current per unit value when for being two with the fault element replace the fault element and are Out-of-balance current per unit value is as current reference for the moment.
15. system according to claim 14, which is characterized in that the state monitoring module further include:
4th monitoring result output module, the changing value for the out-of-balance current size per unit value when fault element is m are big The changing value of out-of-balance current size per unit value when fault element is ceil (n/2), and the accumulated value of first bridge arm When for ceil (n/2), the status monitoring result for exporting the H bridge capacitor group is alarm signal, for identifying first bridge The fault element number of arm reaches the half of the maximum failure original part number.
16. system according to claim 15, which is characterized in that the state monitoring module further include:
5th monitoring result output module, the changing value for the out-of-balance current size per unit value when fault element is m are big The changing value of out-of-balance current size per unit value when fault element is n, and the accumulated value of first bridge arm is failure member When part is n, the status monitoring result for exporting the H bridge capacitor group is trip signal, for identifying the event of first bridge arm Barrier parts number reaches the maximum failure original part number, can not longtime running.
17. a kind of computer equipment characterized by comprising it is adapted for carrying out the processor and storage equipment of each instruction, it is described Storage equipment is stored with a plurality of instruction, and described instruction is suitable for being loaded by processor and being executed such as claim 1 to 8 any one institute A kind of state monitoring method for the H bridge capacitor group stated.
18. a kind of computer readable storage medium, which is characterized in that be stored with computer program, the computer program is used for Execute a kind of state monitoring method of H bridge capacitor group as described in claim 1 to 8 any one.
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CN117554769B (en) * 2024-01-12 2024-03-19 沈阳圣祥科技有限公司 Detection system for breakdown of capacitive element of capacitive voltage transformer

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