CN104297604B - Pilot system and method for a kind of harmonic wave on shunt capacitor temperature rise and loss influence - Google Patents
Pilot system and method for a kind of harmonic wave on shunt capacitor temperature rise and loss influence Download PDFInfo
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Abstract
The invention discloses pilot system and method for a kind of harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that comprises the following steps：1）Harmonic source is adjusted, harmonic source is sent the harmonic voltage of fundamental voltage equal to rated capacitor voltage, different number of times and different content, the temperature and voltage x current value of observed and recorded capacitor.2）According to constant voltage method computing formula, it is ensured that the total voltage virtual value of harmonic source output is constantly equal to the rated voltage of capacitor, the temperature and voltage x current value of observed and recorded capacitor.3）According to galvanostatic method computing formula, it is ensured that the fundamental wave of harmonic source output is equal to the rated current of capacitor, the temperature and voltage x current value of observed and recorded capacitor with the total virtual value of harmonic current.The present invention can scientificlly and effectively carry out harmonic wave to shunt capacitor temperature rise and loss influence experiment, obtain temperature rise and the situation of change of loss in the case of different harmonic waves, the comprehensive accuracy of test data is high.
Description
Technical field
The present invention relates to power system and electrical equipment technical field, more particularly to a kind of harmonic wave is to shunt capacitor temperature rise
And loss influence pilot system and test method.
Background technology
Current high power electronic equipment is one of important pollution sources of power system, can be produced in power network substantial amounts of
Harmonic voltage harmonic electric current, this operation to power system can produce many harmful effects, make the production of electric energy, transmit and make
Efficiency declines, added losses increase, and failure or the damage of electrical equipment can be caused when serious.In addition, there is the electric power of harmonic wave
When installing reactive power compensation capacitor in system, Harmonics amplification can be made under certain conditions, or even cause power system local
Resonance, causes harmonic current in power capacitor excessive, and electric current when serious in capacitor can exceed that its rated current, so that
Cause failure or the damage of power capacitor.
Therefore, the running status for having capacitor in harmonic source power system is analyzed, determines harmonic current to electric capacity
The influence of device and the relation of systematic parameter, specify capacitor and the measure that should be taken are overloaded because of harmonic current, to ensureing capacitor
Safe operation under harmonic condition is very necessary.And instantly for the parallel power condenser generate heat researching and analysing, greatly
The theory analysis stage is partially in, the test method currently for temperature rise merely specify and should be not less than to device application
Rated voltage, and installed capacity is equal to 1.35Q in process of the testN, not clear and definite harmonic wave is to temperature rise and loss
The test method of influence.Existing test method can not intuitively provide harmonic wave and the relation of power capacitor temperature rise, loss, and this is
Because without method of the suitable harmonic wave for power capacitor temperature rise, loss test measurement.
The content of the invention
The problem of in order to solve the test method of the parallel power condenser temperature rise and loss in the prior art, the present invention is provided
A kind of harmonic wave that can scientificlly and effectively carry out influences the system and method for experiment to shunt capacitor temperature rise and loss.
In order to solve the above problems, the technical solution used in the present invention is：
The pilot system that a kind of harmonic wave influences on shunt capacitor temperature rise and loss, including harmonic source, voltage x current mutual inductance
Device and multiple capacitors, it is characterised in that：Also include power quality analyzer, wave tracer and infrared thermography, it is described
The fundamental wave and each harmonic that harmonic source can send different amplitudes and phase are transferred to voltage current transformer, the voltage x current
Transformer is connected by data wire with capacitor, and the power quality analyzer is by voltage current transformer to flowing through electric capacity
The voltage and electric current of device are monitored in real time, wave tracer receiving voltage current transducer signal, record real voltage electricity
Stream Wave data is used for the analysis being lost, and the infrared thermography records the infared spectrum of capacitor to pseudocapacitor
For sensing capacitor surface temperature.
A kind of pilot system of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：Also include
Mercurial thermometer, three mercurial thermometers take its average value to record environment temperature as in the container for filling oil.
A kind of test method of harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：Using permanent fundamental wave method,
Constant voltage method and galvanostatic method test and record temperature rise value and loss, permanent fundamental wave method keep the constant increase of fundamental voltage humorous
Wave voltage carries out temperature rise and loss test；Constant voltage method reduces fundamental voltage, increases harmonic voltage, the total electricity for exporting harmonic source
Temperature rise and loss test are carried out when pressure is consistent with rated capacitor voltage, galvanostatic method reduction fundamental voltage increases harmonic voltage,
The total current for flowing through capacitor is set to carry out temperature rise and loss test when being equal to rated capacitor electric current, harmonic wave electricity added by three kinds of methods
Pressure is identical with fundamental voltage initial phase.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Fundamental wave method, specifically includes following steps：
Step S101：Adjust harmonic source, the fundamental voltage U for sending harmonic source1Equal to the rated voltage U of capacitorN；
Step S102：Harmonic source is adjusted, harmonic source is sent the harmonic voltage U of different number of times and different contenth, observation note
Record the voltage x current actual value under the temperature change of capacitor, record each case；
Step S103：Repeat step S102, obtains more data.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Voltage method, specifically includes following steps：
Step S201：Harmonic source is adjusted, the fundamental voltage U for exporting harmonic source1Equal to the rated voltage U of capacitorN；
Step S202：According to constant voltage method computing formula, harmonic source, the fundamental voltage U for sending harmonic source are adjusted1Drop
Low, experiment every time only applies single subharmonic voltage Uh, it is ensured that the total voltage virtual value U of harmonic source outputΣIt is constantly equal to capacitor
Rated voltage UN, the temperature change of observed and recorded capacitor, record each case under voltage x current actual value；
Step S203：According to constant voltage method computing formula, harmonic source, the fundamental voltage U for sending harmonic source are adjusted1Drop
Low, experiment every time applies aliasing subharmonic voltage Um,Ensure the total voltage virtual value U of harmonic source outputΣ
It is constantly equal to the rated voltage U of capacitorN, the temperature change of observed and recorded capacitor, the voltage x current under record each case is real
Actual value；Step S204：Repeat step S202 and S203, obtain more data.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Current method, specifically includes following steps：
Step S301：Adjust harmonic source, the fundamental voltage U for sending harmonic source1Equal to the rated voltage U of capacitorN, lead to
Overvoltage current sensor measurement obtains flowing through the rated current I of capacitorN；
Step S302：According to galvanostatic method total current computing formula, harmonic source, the fundamental voltage for sending harmonic source are adjusted
U1Reduction, every time experiment only applies single subharmonic voltage UhSo that flow through the total current virtual value I of capacitorΣEqual to capacitor
(rated current IN, then fundamental voltage U1With single subharmonic voltage UhMeet galvanostatic method voltage computing formula, observed and recorded electricity
Voltage x current actual value under the temperature change of container, record each case；
Step S303：According to galvanostatic method total current computing formula, harmonic source, the fundamental voltage for sending harmonic source are adjusted
U1Reduction, every time experiment applies aliasing subharmonic voltage Um,So that flowing through capacitor total current virtual value IΣ
Equal to rated capacitor electric current IN, then fundamental voltage U1With each harmonic voltage UhGalvanostatic method voltage computing formula is met, is observed
Record the voltage x current actual value under the temperature change of capacitor, record each case；
Step S304：Repeat step S302 and S303 obtain more data.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Voltage method, in step S202, S203, using constant voltage method computing formula, regulation fundamental voltage U1With h subharmonic voltages Uh's
Computing formula is：
Wherein UΣFor the total voltage of harmonic source output, U1For the fundamental voltage of harmonic source output, UhThe h exported for harmonic source
Subharmonic voltage, UNFor the rated voltage of capacitor.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Current method, in step S302, S303, using galvanostatic method total current computing formula, regulation fundamental voltage U1With h subharmonic electricity
Press UhComputing formula be：
Wherein IΣFor circuit total current, I1For circuit fundamental current, IhFor circuit h subharmonic currents, ω0For angular frequency, CN
It is h subharmonic numbering, U for the rated capacity of capacitor, h1For the fundamental voltage of harmonic source output, UhThe h exported for harmonic source
Subharmonic voltage.
A kind of test method of the foregoing harmonic wave on shunt capacitor temperature rise and loss influence, it is characterised in that：The perseverance
Current method, in step S302, S303, using galvanostatic method voltage computing formula, regulation fundamental voltage U1With h subharmonic voltages
UhComputing formula be：
Wherein h is h subharmonic numbering, U1For the fundamental voltage of harmonic source output, UhThe h subharmonic electricity exported for harmonic source
Pressure, UNFor the rated voltage of capacitor.
The beneficial effect that the present invention is reached：
This method can scientificlly and effectively carry out harmonic wave to shunt capacitor temperature rise and loss influence experiment, obtain different humorous
Temperature rise and the situation of change of loss in the case of ripple, the comprehensive accuracy of test data are high.
Prior art processing mode has two kinds, is to apply 1.2Un power-frequency voltages respectively, applies the voltage for being not less than Un and makes
Installed capacity is equal to 1.35Qn in experimentation.Existing two methods only give the limit value of power-frequency voltage, or only provide
Capacity during device experiment.
Such as tested according to prior art, be only capable of obtaining temperature rise and loss song of the capacitor under power-frequency voltage
Line, can not all solve the problem of proposed harmonic wave influences on temperature rise.According to this method, it can be deduced that capacitor is each
Plant the temperature rise under harmonic condition and damage curve.This method is with art methods in main method, acquired results and advantage and disadvantage
Aspect it is specific compare see the table below it is shown：
Brief description of the drawings
Fig. 1 is test system architecture schematic diagram of the harmonic wave of the present invention on shunt capacitor temperature rise and loss influence.
Each reference is described in detail below：
(1) it is harmonic source, (2) are voltage current transformer, and (3) are power quality analyzer, and (4) are wave tracer,
(5) it is infrared thermography, (6) mercurial thermometer, (7) are capacitor.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Each module is pressed into electrical wiring Fig. 1 correct wirings, harmonic source is connected with 3 single-phase electricity containers and constitutes test system
System.
The pilot system that the harmonic wave influences on shunt capacitor temperature rise and loss, including harmonic source (1), voltage x current are mutual
Sensor (2), multiple capacitors (7), power quality analyzer (3), wave tracer (4), infrared thermography (5) and include mercury
Thermometer (6), the harmonic source (1) can send the fundamental wave and each harmonic of different amplitudes and phase, and to be transferred to voltage x current mutual
Sensor (2), the voltage current transformer (2) is connected by data wire with capacitor (7), the power quality analyzer
(3) voltage and electric current that flow through capacitor (7) are monitored in real time by voltage current transformer (2), wave tracer (4)
Receiving voltage current transformer (2) signal, records the analysis that real voltage current waveform data are used for being lost, described red
Outer thermal imaging system (5) is used for sensing capacitor (7) surface temperature to pseudocapacitor (7), the infared spectrum of record capacitor (7),
Three mercurial thermometers (6) take its average value to record environment temperature as in the container for filling oil.
The test method that harmonic wave of the present invention influences on shunt capacitor temperature rise and loss, using permanent fundamental wave method, constant voltage method
Temperature rise value and loss are tested and recorded with galvanostatic method, and permanent fundamental wave method keeps the constant increase harmonic voltage of fundamental voltage to enter
Row temperature rise and loss test；Constant voltage method reduce fundamental voltage, increase harmonic voltage, make harmonic source (1) export total voltage with
Temperature rise and loss test are carried out when capacitor (7) rated voltage is consistent, galvanostatic method reduction fundamental voltage increases harmonic voltage,
Make to flow through and temperature rise and loss test are carried out when the total current of capacitor (7) is equal to capacitor (7) rated current, added by three kinds of methods
Harmonic voltage is identical with fundamental voltage initial phase.
Wherein permanent fundamental wave method, reference picture 1 specifically includes following steps：
Step S101：Harmonic source (1) is adjusted, the fundamental wave output amplitude of harmonic source (1) is set, makes fundamental voltage U1Equal to electricity
The rated voltage U of container (7)N, rated voltage U is determined by power quality analyzer (3)N, record now voltage current waveform,
Capacitor infared spectrum and ambient temperature value.
Step S102：Harmonic source (1) is adjusted, sets the fundamental wave output amplitude of harmonic source (1) to be equal to the specified of capacitor (7)
Voltage UN, adjust the harmonic voltage U that harmonic source (1) sends different number of times and different contenth, by power quality analyzer (3) really
Rated voltage UN, record now voltage current waveform, capacitor infared spectrum and ambient temperature value.
Step S103：Repeat step S102, obtains more data.
Wherein constant voltage method, reference picture 1 specifically includes following steps：
Step S201：Harmonic source (1) is adjusted, the fundamental wave output amplitude and initial phase of harmonic source (1) are set, makes fundamental wave electricity
Press U1Equal to the rated voltage U of capacitor (7)N, rated voltage U is determined by power quality analyzer (3)N, record now voltage
Current waveform, capacitor infared spectrum and ambient temperature value.
Step S202：According to constant voltage method computing formula, regulation harmonic source (1), the fundamental voltage for sending harmonic source (1)
U1Reduction, every time experiment applies single subharmonic voltage Uh, it is ensured that the total voltage virtual value U of harmonic source (1) outputΣIt is constantly equal to electricity
The rated voltage U of container (7)N.Magnitude of voltage U is determined by power quality analyzer (3)Σ, record now voltage current waveform, electricity
Container infared spectrum and ambient temperature value.
Step S203：According to constant voltage method computing formula, regulation harmonic source (1), the fundamental voltage for sending harmonic source (1)
U1Reduction, every time experiment applies aliasing subharmonic voltage Um,Ensureing the total voltage of harmonic source (1) output has
Valid value UΣIt is constantly equal to the rated voltage U of capacitor (7)N.Magnitude of voltage U is determined by power quality analyzer (3)Σ, record is now
Voltage current waveform, capacitor infared spectrum and ambient temperature value.
Step S204：Repeat step S202, S203, obtains more data.
In wherein described the step of S202, S203, using constant voltage method computing formula, regulation fundamental voltage U1It is humorous with h times
Wave voltage UhComputing formula be：
Wherein UΣFor the total voltage of harmonic source (1) output, U1For the fundamental voltage of harmonic source (1) output, UhFor the quality of power supply
H subharmonic voltages that analyzer (3) is measured, UNFor the rated voltage of capacitor (7).
Wherein galvanostatic method, reference picture 1 specifically includes following steps：
Step S301：Harmonic source (1) is adjusted, the fundamental wave output amplitude and initial phase of harmonic source (1) are set, makes fundamental wave electricity
Press U1Equal to the rated voltage U of capacitor (7)N, now condenser current value is equal to rated current IN.Pass through power quality analysis
Instrument (3) determines rated current IN, record now voltage current waveform, capacitor infared spectrum and ambient temperature value.
Step S302：According to galvanostatic method total current computing formula, regulation harmonic source (1) changes fundamental voltage U1With it is single
Subharmonic voltage Uh, make fundamental voltage U1With single subharmonic voltage UhGalvanostatic method voltage computing formula is met, now total current
IΣEqual to capacitor (7) rated current IN.Rated current I is determined by power quality analyzer (3)N, record now voltage x current
Waveform, capacitor infared spectrum and ambient temperature value.
Step S303：According to galvanostatic method total current computing formula, regulation harmonic source (1) changes fundamental voltage U1With each time
Harmonic voltage Uh, make fundamental voltage U1With each harmonic voltage UhGalvanostatic method voltage computing formula is met, now total current IΣDeng
In capacitor (7) rated current IN.Rated current I is determined by power quality analyzer (3)N, record now voltage x current ripple
Shape, capacitor infared spectrum and ambient temperature value.
Step S304：Repeat step S302, S303, obtains more data.
In wherein described the step of S302, S303, using galvanostatic method total current computing formula, regulation fundamental voltage U1With
H subharmonic voltages UhComputing formula be：
Wherein IΣFor total current, I1For circuit fundamental current, IhFor circuit h subharmonic currents, ω0For angular frequency, CNFor electricity
The rated capacity of container (7), h are h subharmonic, U1For the fundamental voltage of harmonic source (1) output, UhThe h exported for harmonic source (1)
Subharmonic voltage.
In wherein described the step of S302, S303, using galvanostatic method voltage computing formula, regulation fundamental voltage U1And h
Subharmonic voltage UhComputing formula be：
Wherein h is h subharmonic numbering, U1For the fundamental voltage of harmonic source (1) output, UhH times exported for harmonic source (1)
Harmonic voltage, UNFor the rated voltage of capacitor (7).
General principle, principal character and the advantage of the present invention has been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent circle
It is fixed.
Claims (7)
1. a kind of harmonic wave is on the test method of shunt capacitor temperature rise and loss influence, it is characterised in that：Using permanent fundamental wave method, perseverance
Voltage method and galvanostatic method test and record temperature rise value and loss, permanent fundamental wave method keep the constant increase harmonic wave of fundamental voltage
Voltage carries out temperature rise and loss test；Constant voltage method reduces fundamental voltage, increases harmonic voltage, makes the total of harmonic source (1) output
Temperature rise and loss test are carried out when voltage is consistent with capacitor (7) rated voltage；Galvanostatic method reduces fundamental voltage, increases harmonic wave
Voltage, makes the total current virtual value I for flowing through capacitor (7)ΣTemperature rise and loss examination are carried out during equal to capacitor (7) rated current
Test, harmonic voltage added by three kinds of methods is identical with fundamental voltage initial phase.
2. a kind of harmonic wave according to claim 1 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The permanent fundamental wave method, specifically includes following steps：
Step S101：Adjust harmonic source (1), the fundamental voltage U for sending harmonic source (1)1Equal to the rated voltage of capacitor (7)
UN；
Step S102：Harmonic source (1) is adjusted, harmonic source (1) is sent the harmonic voltage U of different number of times and different contenth, observation
Record the temperature change and voltage x current value of capacitor (7)；
Step S103：Repeat step S102, obtains more data.
3. a kind of harmonic wave according to claim 2 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The constant voltage method, specifically includes following steps：
Step S201：Harmonic source (1) is adjusted, the fundamental voltage U for exporting harmonic source (1)1Equal to the rated voltage of capacitor (7)
UN；
Step S202：According to constant voltage method computing formula, regulation harmonic source (1), the fundamental voltage U for sending harmonic source (1)1Drop
Low, experiment every time only applies single subharmonic voltage Uh, it is ensured that the total voltage virtual value U of harmonic source (1) outputΣIt is constantly equal to electric capacity
The rated voltage U of device (7)N, the temperature change and voltage x current value of observed and recorded capacitor (7)；
Step S203：According to constant voltage method computing formula, regulation harmonic source (1), the fundamental voltage U for sending harmonic source (1)1Drop
Low, experiment every time applies aliasing subharmonic voltage Um,Ensure the total voltage virtual value of harmonic source (1) output
UΣIt is constantly equal to the rated voltage U of capacitor (7)N, the temperature change and voltage x current value of observed and recorded capacitor (7)；
Step S204：Repeat step S202 and S203, obtain more data.
4. a kind of harmonic wave according to claim 3 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The galvanostatic method, specifically includes following steps：
Step S301：Adjust harmonic source (1), the fundamental voltage U for sending harmonic source (1)1Equal to the rated voltage of capacitor (7)
UN, the rated current I for obtaining flowing through capacitor is measured by current-voltage transformer (2)N；
Step S302：According to galvanostatic method total current computing formula, regulation harmonic source (1), the fundamental wave electricity for sending harmonic source (1)
Press U1Reduction, every time experiment only applies single subharmonic voltage UhSo that flow through the total current virtual value I of capacitor (7)ΣIt is equal to
Capacitor (7) rated current IN, then fundamental voltage U1With single subharmonic voltage UhGalvanostatic method voltage computing formula is met, is seen
Examine the temperature change and voltage x current value of record capacitor (7)；
Step S303：According to galvanostatic method total current computing formula, regulation harmonic source (1), the fundamental wave electricity for sending harmonic source (1)
Press U1Reduction, every time experiment applies aliasing subharmonic voltage Um,So that flowing through capacitor (7) total current has
Valid value IΣEqual to capacitor (7) rated current IN, then fundamental voltage U1With each harmonic voltage UhMeet the calculating of galvanostatic method voltage
Formula；The temperature change and voltage x current value of observed and recorded capacitor (7)；
Step S304：Repeat step S302 and S303 obtain more data.
5. a kind of harmonic wave according to claim 4 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The constant voltage method, in step S202, S203, using constant voltage method computing formula, regulation fundamental voltage U1With h times
Harmonic voltage UhComputing formula be：
Wherein UΣFor the total voltage virtual value of harmonic source (1) output, U1For the fundamental voltage of harmonic source (1) output, UhFor harmonic source
(1) the h subharmonic voltages of output, UNFor the rated voltage of capacitor (7).
6. a kind of harmonic wave according to claim 5 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The galvanostatic method, in step S302, S303, using galvanostatic method total current computing formula, regulation fundamental voltage U1
With h subharmonic voltages UhComputing formula be：
Wherein IΣFor total current virtual value, I1For circuit fundamental current, IhFor circuit h subharmonic currents, ω0For angular frequency, CNFor
The rated capacity of capacitor (7), h are h subharmonic numbering, U1For the fundamental voltage of harmonic source (1) output, UhFor harmonic source (1)
The h subharmonic voltages of output.
7. a kind of harmonic wave according to claim 6 is on the test method of shunt capacitor temperature rise and loss influence, its feature
It is：The galvanostatic method, in step S302, S303, using galvanostatic method voltage computing formula, regulation fundamental voltage U1With
H subharmonic voltages UhComputing formula be：
Wherein h is h subharmonic numbering, U1For the fundamental voltage of harmonic source (1) output, UhThe h subharmonic exported for harmonic source (1)
Voltage, UNFor the rated voltage of capacitor (7).
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| CN108072803B (en) * | 2017-01-19 | 2020-03-13 | 上海展枭新能源科技有限公司 | Method for acquiring time-dependent change of capacitance heating temperature under natural cooling and derivation method thereof |
| CN111751636B (en) * | 2019-03-29 | 2022-09-23 | 南京南瑞继保电气有限公司 | Equivalent temperature rise test method for damping capacitor of high-voltage converter valve |
| CN113714152B (en) * | 2021-08-26 | 2023-02-28 | 深圳市今朝时代股份有限公司 | Energy storage type super capacitor screening method applied to aerospace power supply |
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