CN108964029A - Shunt capacitor safety on line based on whole-life cycle fee runs method for early warning - Google Patents
Shunt capacitor safety on line based on whole-life cycle fee runs method for early warning Download PDFInfo
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- CN108964029A CN108964029A CN201810732777.5A CN201810732777A CN108964029A CN 108964029 A CN108964029 A CN 108964029A CN 201810732777 A CN201810732777 A CN 201810732777A CN 108964029 A CN108964029 A CN 108964029A
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- capacitor
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- 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
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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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a kind of, and the shunt capacitor safety on line based on whole-life cycle fee runs method for early warning, comprising the following steps: 1) monitors on-line to power quality electromagnetic environment locating for capacitor, obtain stationary power quality and transient power quality；2) stationary power quality and transient power quality the building condenser voltage obtained according to step 1) temporarily rises Early-warning Model, condenser voltage peak value model and condenser capacity model；3) Early-warning Model, condenser voltage peak value model and condenser capacity model temporarily being risen according to condenser voltage, safety on line operation early warning being carried out to shunt capacitor respectively, this method can be safely operated shunt capacitor and carry out on-line early warning.
Description
Technical field
The present invention relates to a kind of shunt capacitor safety on line to run method for early warning, is related to a kind of based on life cycle management pipe
The shunt capacitor safety on line of reason runs method for early warning.
Background technique
Electric power electricity supplying and using system is a complicated electromagnetic environment, and all electrical equipments operate in such a power quality
Under environment, if power quality environment has exceeded the bearing capacity of electrical equipment, it is possible to harm is generated to electrical equipment, when these
To a certain extent, electrical equipment may damage for harm accumulation.In turn, electrical equipment runs under potential risk and also will affect
The Change and Development of its power quality environment.Therefore, the constraint based on design phase electrical equipment carrying power quality environment, from money
The angle for producing whole-life cycle fee carries out whole early warning to electric equipment operation, is to guarantee electrical equipment safe and reliable operation
Necessary means.
It is so-called to be based on assets whole-life cycle fee, the i.e. electrical constraints from the capacitor design stage, from capacitor
Installation and operation starts, and in conjunction with its series reactance and power grid context parameter founding mathematical models, and realizes that potential accident potential is pre-
It is alert, foundation is provided for the accurate O&M of shunt capacitor and repair based on condition of component, finds and eliminates safe hidden trouble early, avoid the hair of accident
It is raw, the O&M cost of overhaul is reduced, effectively extension service life, realizes that shunt capacitor asset management safety, efficiency, cost are comprehensive
Optimal target.
The type local-discharge ultrasonic wave signal excited by sensing capacitor failure, judges fault type, failure strength, failure
Evolution trend realizes the automatic early-warning to capacitor faults, however this method needs to install partial discharge sensor, temperature sensor
Equal external equipments, in addition, this method carries out early warning judgement, poor reliability according to laboratory partial discharge waveform.
The capacitance of each phase is calculated by Power Quality Detection data, and takes the method for data mining to the hair of capacitance
Exhibition is predicted, and the regulation based on standard DL/T 840-2003 " high-voltage parallel capacitor uses technical conditions ": capacitor group
Requirement of the difference no more than 5% for surveying total capacitance and each rated capacitor capacitance synthesis carries out early warning, however this method is still
The influence that all kinds of electromagnetic distus run capacitor is not accounted for, therefore cannot accurately realize that the safe operation to capacitor carries out
Early warning.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, provide a kind of based on whole-life cycle fee
Shunt capacitor safety on line runs method for early warning, and this method can be safely operated shunt capacitor and carry out on-line early warning.
In order to achieve the above objectives, the shunt capacitor safety on line operation of the present invention based on whole-life cycle fee
Method for early warning the following steps are included:
1) power quality electromagnetic environment locating for capacitor is monitored on-line, obtains stationary power quality and transient power
Quality；
2) stationary power quality and transient power quality the building condenser voltage obtained according to step 1) temporarily rises early warning mould
Type, condenser voltage peak value model and condenser capacity model；
3) it is right respectively that Early-warning Model, condenser voltage peak value model and condenser capacity model are temporarily risen according to condenser voltage
Shunt capacitor carries out safety on line and runs early warning.
Concrete operations of the Early-warning Model to the operation early warning of shunt capacitor safety on line are temporarily risen according to condenser voltage are as follows:
It is more than 200 times when capacitor is higher than the temporary raising frequency rate of 1.15 times of voltage ratings in life cycle, then carries out alarm.
Condenser voltage peak value model are as follows:
Wherein, VpeakFor the voltage peak of capacitor, Vc1For the fundamental voltage of capacitor, VcnIt is humorous for the n-th of capacitor
Wave voltage, E1For the power supply open circuit fundamental voltage of capacitor, EnFor n times power supply background harmonic voltage containing ratio, Y1For electric system
Middle compensating electric capacity and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnIt is hindered for compensating electric capacity in electric system and power supply open circuit
Resist coefficient nth harmonic admittance, ω is the actual measurement angular frequency of power grid, and C is the capacitance of capacitor.
Concrete operations according to condenser voltage peak value model to the operation early warning of shunt capacitor safety on line are as follows: pass through electricity
Condenser voltage peak value model obtains the voltage peak of capacitor in real time, when the voltage peak of capacitor is greater than preset threshold, then
Carry out alarm.
Condenser capacity model are as follows:
Wherein, S is the current power output of capacitor, E1For power supply open circuit fundamental voltage, EnFor n times power supply background harmonic voltage
Containing ratio, Y1For compensating electric capacity in electric system and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnTo be mended in electric system
Capacitor and the coefficient nth harmonic admittance of power supply open-circuit impedance are repaid, ω is the actual measurement angular frequency of power grid, and C is the electricity of capacitor
Capacitance.
Concrete operations according to condenser capacity model to the operation early warning of shunt capacitor safety on line are as follows: pass through capacitor
Capacity model obtains the current power output of capacitor in real time, when the current power output of capacitor is greater than preset threshold, then alarms.
Stationary power quality includes fundamental voltage electric current and harmonic voltage electric current, and transient power quality includes voltage swell number
According to.
The invention has the following advantages:
Shunt capacitor safety on line operation method for early warning of the present invention based on whole-life cycle fee is specific
When operation, capacitor local environment is comprehensively considered, monitored on-line, obtained by running power quality electromagnetic environment to capacitor
To the stationary power quality and transient power quality of capacitor, then constructs condenser voltage and temporarily rise Early-warning Model, capacitor electricity
Voltage crest value model and condenser capacity model finally temporarily rise Early-warning Model, condenser voltage peak value according to building condenser voltage
Model and condenser capacity model carry out the operation early warning of shunt capacitor safety on line respectively, it should be noted that base of the present invention
It is monitored on-line in capacitor operation power quality electromagnetic environment, the safety on line operation to realize shunt capacitor is pre-
It is alert, and then realize the accurate early warning of shunt capacitor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of substation in embodiment one；
Fig. 2 is the capacity-warning result figure of embodiment one.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
It is of the present invention based on whole-life cycle fee shunt capacitor safety on line operation method for early warning include with
Lower step:
1) power quality electromagnetic environment locating for capacitor is monitored on-line, obtains stationary power quality and transient power
Quality, stationary power quality include fundamental voltage electric current and harmonic voltage electric current, and transient power quality includes that voltage transient is real-time
Data；
2) stationary power quality and transient power quality the building condenser voltage obtained according to step 1) temporarily rises early warning mould
Type, condenser voltage peak value model and condenser capacity model；
3) it is right respectively that Early-warning Model, condenser voltage peak value model and condenser capacity model are temporarily risen according to condenser voltage
Shunt capacitor carries out safety on line and runs early warning.
Concrete operations of the Early-warning Model to the operation early warning of shunt capacitor safety on line are temporarily risen according to condenser voltage are as follows:
It is more than 200 times when capacitor is higher than the temporary raising frequency rate of 1.15 times of voltage ratings in life cycle, then carries out alarm.
Condenser voltage peak value model are as follows:
Wherein, VpeakFor the voltage peak of capacitor, Vc1For the fundamental voltage of capacitor, VcnIt is humorous for the n-th of capacitor
Wave voltage, E1For the power supply open circuit fundamental voltage of capacitor, EnFor n times power supply background harmonic voltage containing ratio, Y1For electric system
Middle compensating electric capacity and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnIt is hindered for compensating electric capacity in electric system and power supply open circuit
Resist coefficient nth harmonic admittance, ω is the actual measurement angular frequency of power grid, and C is the capacitance of capacitor.
Concrete operations according to condenser voltage peak value model to the operation early warning of shunt capacitor safety on line are as follows: pass through electricity
Condenser voltage peak value model obtains the voltage peak of capacitor in real time, when the voltage peak of capacitor is greater than preset threshold, then
Carry out alarm.
Condenser capacity model are as follows:
Wherein, S is the capacity of capacitor, E1For power supply open circuit fundamental voltage, EnContain for n times power supply background harmonic voltage
Rate, Y1For compensating electric capacity in electric system and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnTo compensate electricity in electric system
Hold and the coefficient nth harmonic admittance of power supply open-circuit impedance, ω are the actual measurement angular frequency of power grid, C is the capacitance of capacitor.
Concrete operations according to condenser capacity model to the operation early warning of shunt capacitor safety on line are as follows: pass through capacitor
Capacity model obtains the current power output of capacitor in real time, when the current power output of capacitor is greater than preset threshold, then alarms.
Embodiment one
Present invention can apply to Substation Parallel Capacitors to compensate real-time early warning.
As shown in Figure 1,35kV substation shares main transformer 2, #1 main transformer capacity is 3.15MVA, main transformer model SZ9-
3150/35, (high/low) voltage rating is 35 ± 3*2.5%/10.5, on-load regulator transformer；#2 main transformer capacity is 3.15MVA,
Main transformer model SZ9-3150/35, (high/low) voltage rating is 35 ± 3*2.5%/10.5, on-load regulator transformer.The power transformation
The 35kV inlet wire 2 stood returns, and 10kV uses single bus scheme；10kV system paired running installs 1 group of parallel capacitor device, type
Number be TBB10-1000AKW.Source of early warning installation point is 194 capacitor switch of 10kV bus bar side, and context parameter is as shown in table 1.
Table 1
Fig. 2 is capacity-warning result, it is seen that 5 subharmonic constitute a threat to capacitor operation, need to take measures.
Claims (7)
1. a kind of shunt capacitor safety on line based on whole-life cycle fee runs method for early warning, which is characterized in that including
Following steps:
1) power quality electromagnetic environment locating for capacitor is monitored on-line, obtains stationary power quality and transient power matter
Amount；
2) stationary power quality and transient power quality the building condenser voltage obtained according to step 1) temporarily rises Early-warning Model, electricity
Condenser voltage peak value model and condenser capacity model；
3) Early-warning Model, condenser voltage peak value model and condenser capacity model are temporarily risen according to condenser voltage respectively to parallel connection
Capacitor carries out safety on line and runs early warning.
2. the shunt capacitor safety on line according to claim 1 based on whole-life cycle fee runs method for early warning,
It is characterized in that, temporarily rising concrete operations of the Early-warning Model to the operation early warning of shunt capacitor safety on line according to condenser voltage
Are as follows:
It is more than 200 times when capacitor is higher than the temporary raising frequency rate of 1.15 times of voltage ratings in life cycle, then carries out alarm.
3. the shunt capacitor safety on line according to claim 1 based on whole-life cycle fee runs method for early warning,
It is characterized in that, condenser voltage peak value model are as follows:
Wherein, VpeakFor the voltage peak of capacitor, Vc1For the fundamental voltage of capacitor, VcnFor the n-th harmonic electricity of capacitor
Pressure, E1For the power supply open circuit fundamental voltage of capacitor, EnFor n times power supply background harmonic voltage containing ratio, Y1To be mended in electric system
Repay capacitor and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnIt is total for compensating electric capacity in electric system and power supply open-circuit impedance
The nth harmonic admittance of same-action, ω are the actual measurement angular frequency of power grid, and C is the capacitance of capacitor.
4. the shunt capacitor safety on line according to claim 3 based on whole-life cycle fee runs method for early warning,
It is characterized in that, the concrete operations according to condenser voltage peak value model to the operation early warning of shunt capacitor safety on line are as follows: logical
The voltage peak that condenser voltage peak value model obtains capacitor in real time is crossed, when the voltage peak of capacitor is greater than preset threshold
When, then carry out alarm.
5. the shunt capacitor safety on line according to claim 1 based on whole-life cycle fee runs method for early warning,
It is characterized in that, condenser capacity model are as follows:
Wherein, S is the current power output of capacitor, E1For power supply open circuit fundamental voltage, EnContain for n times power supply background harmonic voltage
Rate, Y1For compensating electric capacity in electric system and the coefficient fundamental wave admittance of power supply open-circuit impedance, YnTo compensate electricity in electric system
Hold and the coefficient nth harmonic admittance of power supply open-circuit impedance, ω are the actual measurement angular frequency of power grid, C is the capacitance of capacitor.
6. the shunt capacitor safety on line according to claim 5 based on whole-life cycle fee runs method for early warning,
It is characterized in that, the concrete operations according to condenser capacity model to the operation early warning of shunt capacitor safety on line are as follows: pass through electricity
Container capacity model obtains the current power output of capacitor in real time, when the current power output of capacitor is greater than preset threshold, then carries out
Alarm.
7. the shunt capacitor safety on line according to claim 1 based on whole-life cycle fee runs method for early warning,
It is characterized in that, stationary power quality includes fundamental voltage electric current and harmonic voltage electric current, transient power quality includes that voltage is temporary
It rises.
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| CN201810732777.5A CN108964029B (en) | 2018-07-05 | 2018-07-05 | Online safe operation early warning method for parallel capacitor based on life cycle management |
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| CN201810732777.5A CN108964029B (en) | 2018-07-05 | 2018-07-05 | Online safe operation early warning method for parallel capacitor based on life cycle management |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110057661A1 (en) * | 2009-09-08 | 2011-03-10 | Satish Samineni | Apparatus and method for identifying a faulted phase in a shunt capacitor bank |
| CN103983865A (en) * | 2014-03-25 | 2014-08-13 | 南京能迪电气技术有限公司 | Series reactor power capacitor group operating state real-time online monitoring method |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
-
2018
- 2018-07-05 CN CN201810732777.5A patent/CN108964029B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110057661A1 (en) * | 2009-09-08 | 2011-03-10 | Satish Samineni | Apparatus and method for identifying a faulted phase in a shunt capacitor bank |
| CN103983865A (en) * | 2014-03-25 | 2014-08-13 | 南京能迪电气技术有限公司 | Series reactor power capacitor group operating state real-time online monitoring method |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
Non-Patent Citations (1)
| Title |
|---|
| 郭昆丽，田海霞，王建波，王坤: "《某变电站10kV并联电容器故障分析及对策》", 《广东电力》 * |
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