CN105116256B - A kind of new high voltage converter self-loopa test system and its adjustment method - Google Patents
A kind of new high voltage converter self-loopa test system and its adjustment method Download PDFInfo
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- CN105116256B CN105116256B CN201510536379.2A CN201510536379A CN105116256B CN 105116256 B CN105116256 B CN 105116256B CN 201510536379 A CN201510536379 A CN 201510536379A CN 105116256 B CN105116256 B CN 105116256B
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Abstract
The invention discloses a kind of new high voltage converter self-loopa test system and its adjustment method.White loop test system includes wave filter, the high voltage converter for accompanying survey, high voltage converter to be measured, three-phase reactor and three-phase breaker, the three-phase input end of wave filter is connected with high-voltage fence, the three-phase output end of wave filter is connected with the three-phase input end of high voltage converter to be measured via accompanying the high voltage converter of survey, the three-phase input end of high voltage converter of the three-phase output end of high voltage converter to be measured via three-phase reactor, three-phase breaker with accompanying survey is connected, to constitute white circulation loop.White loop test system of the invention can be prevented effectively from the unbalanced problem of power cell three-phase input current, ensure the data accuracy of every test, it can truly reflect and apply operating mode, especially prevent temperature rise from winding overheat occurring in testing and burns phase-shifting transformer and causes the problem of test can not be completed.
Description
Technical field
System is tested the present invention relates to a kind of self-loopa test system built for high voltage converter and to the self-loopa
The method that system is effectively debugged, belongs to high voltage converter self-loopa technical field of measurement and test.
Background technology
High voltage and high power electromotor using frequency converter as drive device, with high efficiency, High Power Factor and excellent
Speed governing and many advantages, such as open braking ability, it is most promising drive device to be known as both at home and abroad, is current
The energy is saved, production cost is reduced, improves the technological process of production, a kind of primary hand of product quality and automaticity is improved
Section.
In many high voltage converter products, the high voltage converter being made up of three-phase input-single-phase output formula power cell
It is most widely used, it is relatively common and application maturation to have clamped formula high voltage converter (the 5-level H- in 5 level H-bridge midpoints
Bridge Natural Point Clamped Inverter), Cascade H bridge multi-level high-voltage frequency transformer (Cascaded H-
Bridge Multilevel Inverter) etc..Cascade H bridge multi-level high-voltage frequency transformer may be simply referred to as cascaded high-voltage frequency conversion
Device, it uses several low pressure PWM frequency conversion power units 131 to realize High voltage output in the way of overlapped in series, and Fig. 1 and Fig. 2 divide
Topological structure schematic diagram, the structural representation of power cell of cascaded high-voltage frequency converter are not given.5 level H-bridge midpoints are embedding
The structural framing of position formula high voltage converter is substantially similar with cascaded high-voltage frequency converter, is this area existing device, therefore it has
Body is constituted and is not described in detail herein, refer to cascaded high-voltage frequency converter to understand.
For cascaded high-voltage frequency converter, such as Fig. 1, the output voltage warp of high voltage power supply 11 (can be substituted with high-voltage fence 40)
Cross after the phase shift of phase-shifting transformer 12 be power circuit 13 in 3 × n power cell 131 power.Such as Fig. 2, each power cell 131
For three-phase input, the AC-DC-AC PWM voltage source inverter structures of single-phase output, it mainly includes the He of three phase rectifier unit 132
Single-phase inversion unit 133.In actual use, the adjacent output end of power cell 131 is together in series and star-like connection is constituted,
Just High voltage output can be realized, the supply operation of high-voltage motor 50 is used.At present, cascaded high-voltage frequency converter has electric network pollution because of it
Small, input power factor is high, the advantages of output waveform sine degree is good, in blower fan with being widely applied in load of the pumps.
In the production and R＆D process of high voltage converter, it is that checking high voltage converter band carries energy that self-loopa band, which carries test,
Power, test phase-shifting transformer temperature rise, the temperature rise of measured power unit, ensure a kind of qualified Validity Test method of dispatching from the factory.Traditional
Self-loopa band carries test system as shown in figure 3, it mainly includes by high voltage converter 10 to be measured and reactor 20, breaker 30
The self circular loop that series connection is formed.During debugging, by change high voltage converter 10 receive high-voltage fence 40 input voltage amplitude,
Relation between phase and itself output voltage amplitude, phase, to adjust circulation active power and power factor, among these,
High-voltage fence 40 only needs to provide necessary power attenuation and idle buffering, just can meet the high-pressure frequency-conversion of different capacity size
The self-loopa test request of device 10, therefore this test system uses by many production firms.
By taking cascaded high-voltage frequency converter as an example, for each power cell 131, if ignoring output voltage and electric current
Harmonic wave, then output voltage can be represented simply as vo=Vosin(ωoT), it is assumed that the power-factor of load isThen export
Electric current can be expressed asHere ωoIt is the output frequency of cascaded high-voltage frequency converter, Vo、IoIt is level respectively
Output voltage virtual value, the output current virtual value of connection type high-voltage frequency converter, so the instantaneous power that power cell 131 is exported is
As can be seen from the above equation, power output poTo be superimposed sinusoidal fluctuation on steady state value, vibration frequency is output
Frequencies omegao2 times, if the size that reflection is exactly three-phase input current to input side is unequal, and specifically which phase maximum is root
Occur at random according to the control mode of test system at that time, the current value of each phase is according to inductance, high voltage bus in test system
What the parameters such as capacitance were determined.
As can be seen here, the problem of structure of this three-phase input-single-phase output formula of power cell 131 is present be, if
Output frequency is identical with incoming frequency, then this unbalanced relation of three-phase input current will be always maintained at, also
It is to say, if now a phase input currents of some power cell 131 are bigger than normal, then this phase current can be forever bigger than normal, unbalanced existing
As that will keep forever, and in traditional self-loopa band carries test system, the necessary of cascaded high-voltage frequency converter to be measured controls
Condition is the same frequency of input and output, so this visible phenomenon will be certainly existed.
From current abundant experimental results it can be found that being surveyed when high voltage converter 10 to be measured is carried using traditional self-loopa band
When test system carries out the test such as temperature rise, the three-phase input current that high voltage converter 10 to be measured will be produced by power cell is uneven
Weighing apparatus phenomenon and cause test data inaccurate, untrue, even resulting in some windings occurs insulation degradations, ultimately causes tired mistake
Spend and burn phase-shifting transformer, cause the problem of test can not be completed.
The content of the invention
It is an object of the invention to provide a kind of new self-loopa test system built for high voltage converter and
The self-loopa test system is effectively debugged, it is put into the method normally tested and used, is debugged by this method
Complete self-loopa test system is solved by way of " differenceization frequency ", " input voltage sampled point displacement regulation synchronization function "
Traditional self-loopa band carries the above-mentioned deficiency present in test system.
To achieve these goals, present invention employs following technical scheme：
A kind of new high voltage converter self-loopa test system, it is characterised in that：It includes wave filter, accompanies the high pressure of survey
Frequency converter, high voltage converter to be measured, three-phase reactor and three-phase breaker, three-phase input end and the high-voltage fence phase of wave filter
Even, the three-phase output end of wave filter is via accompanying the high voltage converter of survey to be connected with the three-phase input end of high voltage converter to be measured,
The three-phase output end of high voltage converter to be measured is via three-phase reactor, three-phase breaker and the three-phase for the high voltage converter for accompanying survey
Input is connected, to constitute self circular loop, wherein：The synchronization function of high voltage converter to be measured is enabled, makes the high pressure for accompanying survey
The voltage magnitude of the output voltage of voltage magnitude, frequency and the phase of the input voltage of frequency converter and high voltage converter to be measured,
Frequency and phase are consistent respectively；Accompany survey high voltage converter output frequency different from high voltage converter to be measured output frequency
Rate.
For above-mentioned new high voltage converter self-loopa test system, the invention also provides a kind of adjustment method, its
It is characterised by, it includes step：
1) the three-phase breaker separating brake is made；
2) start and adjust the high voltage converter for accompanying survey, the frequency of the output voltage of the high voltage converter of survey is accompanied described in order
Electric voltage frequency of the rate different from the high-voltage fence；
3) start the high voltage converter to be measured and enable the synchronization function of the high voltage converter to be measured, make described
Accompany voltage magnitude, frequency and the phase of the input voltage of the high voltage converter of survey and the output electricity of the high voltage converter to be measured
Voltage magnitude, frequency and the phase of pressure are consistent respectively；
4) three-phase breaker is made to close a floodgate；
5) synchronous coefficient and same period angle offset of the high voltage converter to be measured are adjusted, changes the high pressure to be measured
The output current and output power factor of frequency converter meets the testing requirement carried out in advance.
Difference between the frequency of output voltage and the electric voltage frequency of the high-voltage fence of the high voltage converter for accompanying survey
Value is between ± 2Hz.
In actual design, for the new high voltage converter self-loopa test system of the present invention, the high-voltage fence with
Stable-pressure device can be connected between the wave filter.
For above-mentioned new high voltage converter self-loopa test system, the present invention has also been proposed a kind of adjustment method, its
It is characterised by, it includes step：
1) the three-phase breaker separating brake is made；
2) start and adjust the stable-pressure device, make the frequency of the output voltage of the stable-pressure device remain predetermined frequency
Rate；
3) start and adjust the high voltage converter for accompanying survey, the frequency of the output voltage of the high voltage converter of survey is accompanied described in order
Preset frequency of the rate different from the output voltage of the stable-pressure device；
4) start the high voltage converter to be measured and enable the synchronization function of the high voltage converter to be measured, make described
Accompany voltage magnitude, frequency and the phase of the input voltage of the high voltage converter of survey and the output electricity of the high voltage converter to be measured
Voltage magnitude, frequency and the phase of pressure are consistent respectively；
5) three-phase breaker is made to close a floodgate；
6) synchronous coefficient and same period angle offset of the high voltage converter to be measured are adjusted, changes the high pressure to be measured
The output current and output power factor of frequency converter meets the testing requirement carried out in advance.
The frequency and the predetermined frequency of the output voltage of the stable-pressure device of the output voltage of the high voltage converter for accompanying survey
Difference between rate is between ± 2Hz.
In the present invention, the high voltage converter for accompanying survey, the high voltage converter to be measured can be 5 level H-bridge midpoints
Clamped formula high voltage converter or Cascade H bridge multi-level high-voltage frequency transformer.
It is an advantage of the invention that：
It is uneven that power cell three-phase input current in test system is carried present invention effectively avoids traditional self-loopa band
The problem of weighing apparatus so that the three-phase input current of power cell will not occur certain phase input current and continue phenomenon bigger than normal, so as to treat
The high voltage converter of survey in the self-loopa test system of the present invention for building and having debugged can full power long lasting for operation, come
The test such as load capacity, total power aging, phase-shifting transformer temperature rise, power cell temperature rise of high voltage converter is carried out, and is ensured
Test data it is accurate, true, test data, which can truly reflect, applies operating mode, particularly temperature rise test in, can prevent
Some windings cause excessive fatigue and burn phase-shifting transformer, cause the problem of test can not be completed because of overheat insulation degradation.This
Invention is applied to the self-loopa test of the high voltage converter with three-phase input-single-phase output formula power cell, such as 5 level H
The clamped formula high voltage converter in bridge midpoint, Cascade H bridge multi-level high-voltage frequency transformer.
Brief description of the drawings
Fig. 1 is the topological structure schematic diagram of cascaded high-voltage frequency converter.
Fig. 2 is the structural representation of power cell.
Fig. 3 is that traditional self-loopa band carries test system composition schematic diagram.
Fig. 4 is the composition schematic diagram of self-loopa test system of the present invention.
Embodiment
Such as Fig. 4, the new high voltage converter self-loopa test system of the present invention includes wave filter 90, accompanies the high-pressure frequency-conversion of survey
Device 60, high voltage converter 10 to be measured, three-phase reactor 70 and three-phase breaker 80, the three-phase input end and high pressure of wave filter 90
The three-phase high-voltage bus of power network 40 is connected, and the three-phase output end of wave filter 90 is via the high voltage converter 60 and height to be measured for accompanying survey
The three-phase input end of voltage frequency changer 10 is connected, and the three-phase output end of high voltage converter 10 to be measured is via three-phase reactor 70, three
The three-phase input end of high voltage converter 60 of the phase breaker 80 with accompanying survey is connected, to constitute self circular loop, wherein：Enable to be measured
High voltage converter 10 synchronization function, make voltage magnitude, frequency and the phase of the input voltage for the high voltage converter 60 for accompanying survey
Be consistent respectively with voltage magnitude, frequency and the phase of the output voltage of itself of high voltage converter 10 to be measured, with meet from
The same period of circulation loop and stable operation requirement；The output frequency of high voltage converter 60 of survey is accompanied different from high voltage converter to be measured
10 output frequency.
When the capacity of high-voltage fence 40 is smaller or second-rate, can additionally it be added between high-voltage fence 40 and wave filter 90
Stable-pressure device 100.In other words, when the mass of high-voltage fence 40 is preferable, stable-pressure device 100 can be not provided with, now thinks high
Amplitude, frequency, the phase for the voltage that voltage electric grid 40 is exported are all very stable.
In actual design, wave filter 90 is chosen as LC low pass filters.
In the present invention, high voltage converter 10 to be measured is the follow-up actual high voltage converter tested, and accompanies the height of survey
Voltage frequency changer 60 effectively carries out follow-up test for help high voltage converter 10 to be measured, and when building self-loopa test system
The high voltage converter set up.
In the present invention, the effect of stable-pressure device 100 is, be below accompany survey, high voltage converter 60,10 to be measured is carried
For power attenuation, and complete to exchange with the quadergy between high voltage converter 10 to be measured.The effect of wave filter 90 is
Smooth voltage waveform, it is ensured that sampled point is sufficiently stable.Accompany survey high voltage converter 60 be mainly used in differenceization itself input side with it is defeated
The frequency gone out between side.High voltage converter 10 to be measured is mainly used in subsequently carrying out load capacity, total power aging, phase shift transformation
Device temperature rise, power cell temperature rise etc. are tested.The effect of three-phase breaker 80 is the reliable disjunction for ensureing self circular loop.
In the present invention, to high voltage converter 10 that is to be measured, accompanying survey, 60, stable-pressure device 100 etc. input, output voltage
Collection can be by setting voltage sensor realize that this is well known in the art technology, do not exist on input terminal, lead-out terminal
Here it is described in detail.
In the present invention, stable-pressure device 100, wave filter 90, three-phase reactor 70 and three-phase breaker 80 are this area
Well-known devices, therefore its specific composition is not described in detail herein.
Self-loopa test system of the present invention is applied to the high voltage converter with three-phase input-single-phase output formula power cell
The test such as load capacity, total power aging, phase-shifting transformer temperature rise, power cell temperature rise is carried out, for example：Height that is to be measured, accompanying survey
Voltage frequency changer 10,60 can be 5 level H-bridge midpoints clamped formula high voltage converter (5-level H-bridge Natural simultaneously
Point Clamped Inverter) or Cascade H bridge multi-level high-voltage frequency transformer (Cascaded H-bridge
Multilevel Inverter, referred to as cascaded high-voltage frequency converter) etc..
Cascaded high-voltage frequency converter is as shown in figure 1, it includes high voltage power supply 11, phase-shifting transformer 12, by 3 × n power
(Fig. 1 shows 3 × n power cell C to unit 1311w~Cnw、C1v~Cnv、C1u~CnuSituation) constitute power circuit 13,
High voltage power supply 11 is connected via phase-shifting transformer 12 with power circuit 13, and the one side of power circuit 13 is connected with high-voltage motor 50,
On the other hand, each power cell 131 is connected via optical fiber interface plate with Main Control Tank (not shown) in it, by Main Control Tank control
System.Phase-shifting transformer 12 include the three-phase coil winding (i.e. A, B, C phase coil winding) that primary side star or triangle connect and
Secondary side phase-shifting unit.High voltage power supply 11 can be substituted by high-voltage fence 40.Phase-shifting transformer 12 can be that dry-type transformer or oil are invaded
Transformer.High-voltage motor 50 can be asynchronous machine or synchronous motor.Cascaded high-voltage frequency converter is the existing device of this area, therefore
Its specific composition is not described in detail herein.
In the present invention, for cascaded high-voltage frequency converter, because phase-shifting transformer 12 can ensure input power factor very
Height, so it is believed that accompanying only active power between the cascaded high-voltage frequency converter and cascaded high-voltage frequency converter to be measured of survey to pass
Pass.Because the power cell 131 of cascaded high-voltage frequency converter uses diode rectification (such as Fig. 2), unidirectional delivery is only capable of active
Power, so the reactive power of cascaded high-voltage frequency converter to be measured can only be swapped with the inverter side of stable-pressure device 100, or
Person is directly to feed back to high-voltage fence 40, that is to say, that reactive power is without flow through self circular loop.
The structural framing of the clamped formula high voltage converter in 5 level H-bridge midpoints is substantially similar with cascaded high-voltage frequency converter,
Mainly include high voltage power supply (can be substituted by high-voltage fence), phase-shifting transformer, the power circuit being made up of 5 power cells, its
For the existing device of this area, therefore its specific composition is not described in detail herein, refer to cascaded high-voltage frequency converter to understand.
The situation of stable-pressure device 100 is not provided with for the invention described above self-loopa test system, the invention also provides one
Adjustment method is planted, is comprised the following steps：
1) make the separating brake of three-phase breaker 80 (disconnection) of self circular loop, and ensure to accompany the high voltage converter 60 of survey, it is to be measured
High voltage converter 10 and whole self-loopa test system safe and effective connection, now, accompany the He of high voltage converter 60 of survey
The input voltage shown on high voltage converter 10 to be measured is the magnitude of voltage of high-voltage fence 40, but high voltage variable actually to be measured
The untrue upper electricity of frequency device 10；
2) start and adjust the high voltage converter 60 for accompanying survey, order accompanies the frequency of the output voltage of the high voltage converter 60 of survey different
The electric voltage frequency exported in high-voltage fence 40, for example, the voltage that high-voltage fence 40 is exported is 6.6kV, frequency is 50Hz, then can
The high voltage converter 60 of survey is accompanied in regulation, and the frequency for making its output voltage is 51Hz, and voltage magnitude is not restricted by, and now, is treated
The high voltage converter 10 of survey is truly upper electric；
3) start high voltage converter 10 to be measured and enable the synchronization function of high voltage converter 10 to be measured (synchronization function is
A kind of regulatory function that high voltage converter itself has, is known technology), the input voltage for the high voltage converter 60 for making to accompany survey
Voltage magnitude, frequency and phase and voltage magnitude, frequency and the phase point of the output voltage of itself of high voltage converter 10 to be measured
It is not consistent, that is, realizes output frequency of the output frequency different from high voltage converter 10 to be measured for the high voltage converter 60 for accompanying survey
Rate；
4) three-phase breaker 80 is made to close a floodgate (closure), now self circular loop has Weak current to pass through；
5) synchronous coefficient and same period angle offset of high voltage converter 10 to be measured are adjusted, changes high voltage converter to be measured
10 output current and output power factor meet the test carried out in advance (such as load capacity, total power aging, phase-shifting transformer
Temperature rise, power cell temperature rise etc. are tested) demand, in other words, during a certain test is carried out, wanted according to this test
The size of the output current of high voltage converter 10 to be measured and the number of output power factor are asked, to high voltage converter to be measured
10 output current and output power factor is adjusted, and this is technology known in the art.
It is to be measured after the self-loopa test system for being not provided with stable-pressure device 100 is debugged by the invention described above method
High voltage converter 10 just can carry out the test such as load capacity, total power aging, phase-shifting transformer temperature rise, power cell temperature rise, survey
Trying obtained test data accuracy can be effectively ensured, and test data can truly reflect and apply operating mode.
In actually implementing, the voltage for accompanying the frequency of the output voltage of the high voltage converter 60 of survey to be exported with high-voltage fence 40
Difference between frequency is preferably controlled between ± 2Hz.For example, the voltage that high-voltage fence 40 is exported is 6.6kV, frequency is
50Hz, then it is preferred that regulation after the high voltage converter 60 for accompanying survey output voltage frequency be in 48Hz~52Hz between,
It is 6.6kV, but be not limited thereto and its voltage magnitude can be identical with the voltage magnitude that high-voltage fence 40 is exported.
The situation of stable-pressure device 100 is provided with for the invention described above self-loopa test system, the invention also provides one
Adjustment method is planted, is comprised the following steps：
1) separating brake of three-phase breaker 80 (disconnection) of self circular loop is made, and ensures stable-pressure device 100, accompany the high voltage variable of survey
The safe and effective connection of frequency device 60, high voltage converter 10 to be measured and whole self-loopa test system；
2) start and adjust stable-pressure device 100, make the frequency of the output voltage of stable-pressure device 100 remain preset frequency and
Voltage magnitude is a certain numerical value, and the voltage magnitude for for example making the output voltage of stable-pressure device 100 is 6.6kV, frequency stabilization
In 50Hz, now, accompany the input voltage shown on the high voltage converter 60 and high voltage converter 10 to be measured of survey as this
6.6kV, but the untrue upper electricity of high voltage converter 10 actually to be measured；
3) start and adjust the high voltage converter 60 for accompanying survey, order accompanies the frequency of the output voltage of the high voltage converter 60 of survey different
In the preset frequency of the output voltage of stable-pressure device 100, for example, the output voltage of stable-pressure device 100 is 6.6kV, frequency is
50Hz, then can adjust the high voltage converter 60 for accompanying survey, the frequency for making its output voltage is 51Hz, and voltage magnitude is not limited
System, now, high voltage converter 10 to be measured are truly upper electric；
4) start high voltage converter 10 to be measured and enable the synchronization function of high voltage converter 10 to be measured (synchronization function is
A kind of regulatory function that high voltage converter itself has, is known technology), the input voltage for the high voltage converter 60 for making to accompany survey
Voltage magnitude, frequency and phase and voltage magnitude, frequency and the phase point of the output voltage of itself of high voltage converter 10 to be measured
It is not consistent, that is, realizes output frequency of the output frequency different from high voltage converter 10 to be measured for the high voltage converter 60 for accompanying survey
Rate；
5) three-phase breaker is made to close a floodgate (closure), now self circular loop has Weak current to pass through；
6) synchronous coefficient and same period angle offset of high voltage converter 10 to be measured are adjusted, changes high voltage converter to be measured
10 output current and output power factor meet the test carried out in advance (such as load capacity, total power aging, phase-shifting transformer
Temperature rise, power cell temperature rise etc. are tested) demand, it is in other words, to be measured according to required by this test in a certain test is carried out
High voltage converter 10 output current size and the number of output power factor, to the defeated of high voltage converter 10 to be measured
Go out electric current and output power factor is adjusted, this is technology known in the art.
After the self-loopa test system for being provided with stable-pressure device 100 is debugged by the inventive method, high pressure to be measured
Frequency converter 10 just can carry out the test such as load capacity, total power aging, phase-shifting transformer temperature rise, power cell temperature rise, test
To test data accuracy can be effectively ensured, and test data can truly reflect and apply operating mode.
In actually implementing, the frequency and the output electricity of stable-pressure device 100 of the output voltage of the high voltage converter 60 of survey are accompanied
Difference between the preset frequency of pressure is preferably controlled between ± 2Hz.For example, the output voltage of stable-pressure device 100 is 6.6kV,
Frequency is 50Hz, then it is preferred that regulation after the high voltage converter 60 for accompanying survey output voltage frequency be in 48Hz~
Between 52Hz, and its voltage magnitude can be identical with the voltage magnitude of the output voltage of stable-pressure device 100, is 6.6kV, but not office
It is limited to this.
The method have the characteristics that adding one-level is used for the high voltage converter 60 for accompanying survey of differenceization input and output frequency, and
And, the present invention makes the input voltage of high voltage converter 10 to be measured in the synchronization function of application high voltage converter 10 to be measured
Sampled point has been moved to accompany on the input terminal of the high voltage converter 60 of survey, but the output voltage sampling of high voltage converter 10 to be measured
Point is constant, or on the lead-out terminal of its own.
It can see from theoretical research and the actual running results, when accompanying survey, the input of high voltage converter 60,10 to be measured
When output frequency is unequal, the three-phase input current of their power cell can regularly cyclic balance, that is to say, that at certain
Under one cycle, the virtual value of three-phase input current is equal, and thus this just can directly eliminate traditional self-loopa band and carry test system
The middle unbalanced problem of power cell three-phase input current, so as to more truly reflect system application operating mode, brings following
Series of advantages.
It should be noted that because high voltage converter reaches energy-saving effect in advance, its output frequency is seldom in 50Hz long-times
Operation, so the problem of phase-shifting transformer is damaged seldom occurs, and the present invention is dispatched from the factory typically to satisfaction and tests and research and develop
Used the need for test.
It is an advantage of the invention that：
1st, present invention effectively avoids power cell three-phase input current in traditional self-loopa band load test system not
Balanced the problem of so that the three-phase input current of power cell will not occur certain phase input current and continue phenomenon bigger than normal, so that
High voltage converter to be measured in the self-loopa test system of the present invention for building and having debugged can full power long lasting for operation,
Load capacity, total power aging, phase-shifting transformer temperature rise, power cell temperature rise to carry out high voltage converter etc. are tested, and really
The accurate, true of test data is protected, test data, which can truly reflect, applies operating mode, particularly in temperature rise test, hair can be prevented
Raw some windings cause excessive fatigue and burn phase-shifting transformer, cause the problem of test can not be completed because of overheat insulation degradation.
2nd, self-loopa test system of the present invention is built conveniently, and simulation application operating mode is true, can meet band in test process full
The demand of load, meets the demand of long-play when temperature rise is tested.
3rd, the present invention can be by being simulation inductive load, capacitive load by power factor regulation, to enter line asynchronous electricity respectively
The application simulation of machine, synchronous motor.
4th, the present invention is applied to the self-loopa survey of the high voltage converter with three-phase input-single-phase output formula power cell
Examination, the clamped formula high voltage converter in such as 5 level H-bridge midpoints, Cascade H bridge multi-level high-voltage frequency transformer.
The technical principle described above for being presently preferred embodiments of the present invention and its being used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simply replacement etc. obviously changes, belong within the scope of the present invention.
Claims (10)
1. a kind of new high voltage converter self-loopa test system, it is characterised in that：It includes wave filter, accompanies the high voltage variable of survey
Frequency device, high voltage converter to be measured, three-phase reactor and three-phase breaker, three-phase input end and the high-voltage fence phase of wave filter
Even, the three-phase output end of wave filter is via accompanying the high voltage converter of survey to be connected with the three-phase input end of high voltage converter to be measured,
The three-phase output end of high voltage converter to be measured is via three-phase reactor, three-phase breaker and the three-phase for the high voltage converter for accompanying survey
Input is connected, to constitute self circular loop, wherein：The synchronization function of high voltage converter to be measured is enabled, makes the high pressure for accompanying survey
The voltage magnitude of the output voltage of voltage magnitude, frequency and the phase of the input voltage of frequency converter and high voltage converter to be measured,
Frequency and phase are consistent respectively；Accompany survey high voltage converter output frequency different from high voltage converter to be measured output frequency
Rate.
2. new high voltage converter self-loopa test system as claimed in claim 1, it is characterised in that：
Stable-pressure device is connected between the high-voltage fence and the wave filter.
3. new high voltage converter self-loopa test system as claimed in claim 1, it is characterised in that：
The wave filter is LC low pass filters.
4. new high voltage converter self-loopa test system as claimed in claim 1, it is characterised in that：
The high voltage converter for accompanying survey, the high voltage converter to be measured be the clamped formula high voltage converter in 5 level H-bridge midpoints or
Cascade H bridge multi-level high-voltage frequency transformer.
5. a kind of adjustment method of the new high voltage converter self-loopa test system described in the claims 1, its feature
It is, it includes step：
1) the three-phase breaker separating brake is made；
2) start and adjust the high voltage converter for accompanying survey, accompany the frequency of the output voltage of the high voltage converter of survey different described in order
In the electric voltage frequency of the high-voltage fence；
3) start the high voltage converter to be measured and enable the synchronization function of the high voltage converter to be measured, make described to accompany survey
High voltage converter input voltage voltage magnitude, frequency and phase and the high voltage converter to be measured output voltage
Voltage magnitude, frequency and phase are consistent respectively；
4) three-phase breaker is made to close a floodgate；
5) synchronous coefficient and same period angle offset of the high voltage converter to be measured are adjusted, changes the high-pressure frequency-conversion to be measured
The output current and output power factor of device meets the testing requirement carried out in advance.
6. method as claimed in claim 5, it is characterised in that：
Difference between the frequency of output voltage and the electric voltage frequency of the high-voltage fence of the high voltage converter for accompanying survey exists
Between ± 2Hz.
7. the method as described in claim 5 or 6, it is characterised in that：
The high voltage converter for accompanying survey, the high voltage converter to be measured be the clamped formula high voltage converter in 5 level H-bridge midpoints or
Cascade H bridge multi-level high-voltage frequency transformer.
8. a kind of adjustment method of the new high voltage converter self-loopa test system described in the claims 2, its feature
It is, it includes step：
1) the three-phase breaker separating brake is made；
2) start and adjust the stable-pressure device, make the frequency of the output voltage of the stable-pressure device remain preset frequency；
3) start and adjust the high voltage converter for accompanying survey, accompany the frequency of the output voltage of the high voltage converter of survey different described in order
In the preset frequency of the output voltage of the stable-pressure device；
4) start the high voltage converter to be measured and enable the synchronization function of the high voltage converter to be measured, make described to accompany survey
High voltage converter input voltage voltage magnitude, frequency and phase and the high voltage converter to be measured output voltage
Voltage magnitude, frequency and phase are consistent respectively；
5) three-phase breaker is made to close a floodgate；
6) synchronous coefficient and same period angle offset of the high voltage converter to be measured are adjusted, changes the high-pressure frequency-conversion to be measured
The output current and output power factor of device meets the testing requirement carried out in advance.
9. method as claimed in claim 8, it is characterised in that：
The frequency of the output voltage of the high voltage converter for accompanying survey and the preset frequency of the output voltage of the stable-pressure device it
Between difference between ± 2Hz.
10. method as claimed in claim 8 or 9, it is characterised in that：
The high voltage converter for accompanying survey, the high voltage converter to be measured be the clamped formula high voltage converter in 5 level H-bridge midpoints or
Cascade H bridge multi-level high-voltage frequency transformer.
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| CN105785176B (en) * | 2016-03-11 | 2018-11-09 | 明阳智慧能源集团股份公司 | A kind of more specification full-power wind power converter test platforms |
| CN109470940B (en) * | 2017-09-07 | 2021-03-23 | 株洲变流技术国家工程研究中心有限公司 | Full-power test device and method for converter |
| CN107884634B (en) * | 2017-09-21 | 2020-01-24 | 北京机械设备研究所 | Self-circulation test method of back-to-back converter |
| CN116106780B (en) * | 2023-04-13 | 2023-07-04 | 深圳市鼎泰佳创科技有限公司 | Aging control energy-saving module of frequency converter power supply |
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