CN105116256A - Novel high voltage frequency converter self-circulation test system and debugging method - Google Patents
Novel high voltage frequency converter self-circulation test system and debugging method Download PDFInfo
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Abstract
The invention discloses a novel high voltage frequency converter self-cycling test system and a debugging method. The self-circulation test system comprises a filter, a high voltage frequency converter to be measured in accompany, a high voltage frequency converter to be measured, a three-phase reactor and a three-phase breaker; the three-phase input terminal of the filter is connected to a high voltage power grid; the three phase output terminal of the filter is connected to the three phase input terminal of the high voltage frequency converter to be measured through the high voltage frequency converter to be measured in accompany; the three-phase output terminal of the high voltage frequency converter to be measured is connected to the three-phase input terminal of the high voltage frequency converter to be measured in accompany through the three phase reactor and the three phase breaker in order to form a self-circulation circuit. The self-circulation test system can effectively avoid the imbalance problem of the three phase input current of the power unit, guarantees the accuracy of various tests, reflects the real application conditions, and particularly prevents the condition that the test cannot be finished because the winding is so hot that the phase-shifting transformer is burnt.
Description
Technical field
The present invention relates to a kind of self-loopa test macro for high voltage converter structure and this self-loopa test macro is carried out to the method for effectively debugging, belong to high voltage converter self-loopa technical field of measurement and test.
Background technology
High voltage and high power electromotor adopts frequency converter as drive unit, there is the speed governing of high-level efficiency, High Power Factor and excellence and open the plurality of advantages such as braking ability, being known as both at home and abroad is the most rising drive unit, it is current economize energy, reduce production cost, improve the technological process of production, improve the quality of products and a kind of Main Means of automaticity.
In many high voltage converter products, most widely used general by the three-phase high voltage converter that input-single-phase output type power cell is formed, what more common and application was ripe has the clamped formula high voltage converter (5-levelH-bridgeNaturalPointClampedInverter) of 5 level H-bridge mid point, Cascade H bridge multi-level high-voltage frequency transformer (CascadedH-bridgeMultilevelInverter) etc.Cascade H bridge multi-level high-voltage frequency transformer can referred to as cascaded high-voltage frequency converter, it adopts several low pressure PWM frequency conversion power units 131 to realize High voltage output in the mode of overlapped in series, Fig. 1 and Fig. 2 sets forth the topological structure schematic diagram of cascaded high-voltage frequency converter, the structural representation of power cell.The structural framing of 5 level H-bridge mid point clamped formula high voltage converter is roughly similar with cascaded high-voltage frequency converter, is this area existing device, therefore its concrete formation does not here describe in detail, please refer to cascaded high-voltage frequency converter to understand.
For cascaded high-voltage frequency converter, as Fig. 1, the output voltage of high-voltage power supply 11 (available high-voltage fence 40 substitutes) after phase-shifting transformer 12 phase shift for 3 × n power cell 131 in power circuit 13 is powered.As Fig. 2, each power cell 131 is the AC-DC-AC PWM voltage source inverter structure of three-phase input, single-phase output, and it mainly comprises three phase rectifier unit 132 and single-phase inversion unit 133.When reality uses, be together in series and form star-like connection by adjacent power cell 131 output terminal, just can realize High voltage output, supply high-voltage motor 50 runs and uses.At present, to have electric network pollution little because of it for cascaded high-voltage frequency converter, and the advantages such as input power factor is high, and output waveform sine degree is good, are widely applied in blower fan and load of the pumps.
In the production and R&D process of high voltage converter, self-loopa band carries test and is checking high voltage converter load capacity, tests phase-shifting transformer temperature rise, the temperature rise of measured power unit, ensures to dispatch from the factory a kind of qualified Validity Test method.Traditional self-loopa band carries test macro as shown in Figure 3, and it mainly comprises to be connected with reactor 20, isolating switch 30 self circular loop formed by high voltage converter 10 to be measured.During debugging, the relation between the input voltage amplitude of high-voltage fence 40, phase place and self output voltage amplitude, phase place is received by changing high voltage converter 10, regulate circulation active power and power factor, at this wherein, high-voltage fence 40 only needs to provide necessary power attenuation and idlely to cushion, just can meet the self-loopa test request of the high voltage converter 10 of different capacity size, therefore this test macro adopt by many production firms.
For cascaded high-voltage frequency converter, for each power cell 131, if ignore the harmonic wave of output voltage and electric current, so output voltage simply can be expressed as v
o=V
osin (ω
ot), suppose that the power-factor of load is
then output current can be expressed as
here ω
othe output frequency of cascaded high-voltage frequency converter, V
o, I
othe output voltage effective value of cascaded high-voltage frequency converter, output current effective value respectively, so the instantaneous power that power cell 131 exports is
As can be seen from the above equation, output power p
ofor having superposed sinusoidal fluctuation on steady state value, vibration frequency has been output frequency ω
o2 times, if being reflected to input side is exactly that the size of three-phase input current is unequal, and specifically which is mutually maximum is occur at random according to test macro control mode at that time, the current value of each phase is determined according to parameters such as test macro internal inductance, high voltage bus capacitances.
As can be seen here, the structure Problems existing of this three-phase input-single-phase output type of power cell 131 is, if output frequency is identical with incoming frequency, the unbalanced relation of so this three-phase input current will keep always, that is, if now a phase input current of certain power cell 131 is bigger than normal, so this phase current can be forever bigger than normal, unbalanced phenomena will keep forever, and carry in test macro at traditional self-loopa band, the necessary controlled condition of cascaded high-voltage frequency converter to be measured is that input and output are with frequently, so this phenomenon will certainly exist as seen.
Can find from current abundant experimental results, when high voltage converter 10 to be measured adopt traditional self-loopa band carry test macro carry out the test such as temperature rise time, high voltage converter 10 to be measured just can cause test data inaccurate, untrue because of the three-phase input current unbalanced phenomena of power cell generation, even cause some winding generation insulation degradation, finally cause excessive fatigue and burn phase-shifting transformer, causing the problem of testing and cannot complete.
Summary of the invention
A kind of method that the object of the present invention is to provide novel self-loopa test macro of building for high voltage converter and effectively debug this self-loopa test macro, make it can drop into normal test to use, the self-loopa test macro debugged by the method is solved traditional self-loopa band by the mode of " differenceization frequency ", " input voltage sampled point be shifted adjustment synchronization function " and carries above-mentioned deficiency existing for test macro.
To achieve these goals, present invention employs following technical scheme:
A kind of novel high voltage converter self-loopa test macro, it is characterized in that: it comprises wave filter, accompany the high voltage converter of 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 via the three-phase input end of accompanying the high voltage converter of survey with 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 is connected with the three-phase input end of the high voltage converter of accompanying survey, to form self circular loop, wherein: the synchronization function of enable high voltage converter to be measured, make the voltage magnitude of the input voltage of the high voltage converter of accompanying survey, the voltage magnitude of the output voltage of frequency and phase place and high voltage converter to be measured, frequency and phase place are consistent respectively, the output frequency of the high voltage converter of survey is accompanied to differ from the output frequency of high voltage converter to be measured.
For above-mentioned novel high voltage converter self-loopa test macro, the invention allows for a kind of adjustment method, it is characterized in that, it comprises step:
1) described three-phase breaker separating brake is made;
2) start and accompany the high voltage converter of survey described in regulating, described in order, accompanying the frequency of the output voltage of the high voltage converter of survey to differ from the electric voltage frequency of described high-voltage fence;
3) start described high voltage converter to be measured and the synchronization function of enable described high voltage converter to be measured, described in making, accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter of survey, frequency and phase place and described high voltage converter to be measured, frequency and phase place to be consistent respectively;
4) described three-phase breaker is made to close a floodgate;
5) regulate described high voltage converter to be measured synchronous coefficient and the same period angle offset, the output current and the output power factor that change described high voltage converter to be measured meet the testing requirement of carrying out in advance.
Difference between described electric voltage frequency of accompanying the frequency of the output voltage of the high voltage converter of survey and described high-voltage fence is between ± 2Hz.
In actual design, for the high voltage converter self-loopa test macro that the present invention is novel, between described high-voltage fence and described wave filter, stable-pressure device can be connected with.
For above-mentioned novel high voltage converter self-loopa test macro, the present invention also been proposed a kind of adjustment method, it is characterized in that, it comprises step:
1) described three-phase breaker separating brake is made;
2) start and regulate described stable-pressure device, making the frequency of the output voltage of described stable-pressure device remain preset frequency;
3) start and accompany the high voltage converter of survey described in regulating, described in order, accompanying the frequency of the output voltage of the high voltage converter of survey to differ from the preset frequency of the output voltage of described stable-pressure device;
4) start described high voltage converter to be measured and the synchronization function of enable described high voltage converter to be measured, described in making, accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter of survey, frequency and phase place and described high voltage converter to be measured, frequency and phase place to be consistent respectively;
5) described three-phase breaker is made to close a floodgate;
6) regulate described high voltage converter to be measured synchronous coefficient and the same period angle offset, the output current and the output power factor that change described high voltage converter to be measured meet the testing requirement of carrying out in advance.
Difference between described preset frequency of accompanying the output voltage of the frequency of the output voltage of the high voltage converter of survey and described stable-pressure device is between ± 2Hz.
In the present invention, accompany the high voltage converter of survey described in, described high voltage converter to be measured can be the clamped formula high voltage converter of 5 level H-bridge mid point or Cascade H bridge multi-level high-voltage frequency transformer.
Advantage of the present invention is:
Present invention effectively avoids traditional self-loopa band and carry the unbalanced problem of power cell three-phase input current in test macro, make the three-phase input current of power cell that certain phase input current can not occur and continue phenomenon bigger than normal, thus high voltage converter to be measured is building and can the long-time continuous service of full power in the self-loopa test macro of the present invention debugged, carry out the load capacity of high voltage converter, total power is aging, phase-shifting transformer temperature rise, the tests such as power cell temperature rise, and guarantee the accurate of test data, truly, test data can truly reflect application operating mode, particularly in temperature rise test, some winding can be prevented because of overheated insulation degradation, cause excessive fatigue and burn phase-shifting transformer, cause the problem of testing and cannot complete.The present invention is applicable to the self-loopa test of the high voltage converter with three-phase input-single-phase output type power cell, the such as clamped formula high voltage converter of 5 level H-bridge mid point, Cascade H bridge multi-level high-voltage frequency transformer.
Accompanying drawing explanation
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 macro composition schematic diagram.
Fig. 4 is the composition schematic diagram of self-loopa test macro of the present invention.
Embodiment
As Fig. 4, the novel high voltage converter self-loopa test macro of the present invention comprises wave filter 90, accompany the high voltage converter 60 of survey, high voltage converter 10 to be measured, three-phase reactor 70 and three-phase breaker 80, the three-phase input end of wave filter 90 is connected with the three-phase high-voltage bus of high-voltage fence 40, the three-phase output end of wave filter 90 is connected via the three-phase input end of accompanying the high voltage converter 60 of survey with high voltage converter 10 to be measured, the three-phase output end of high voltage converter 10 to be measured is via three-phase reactor 70, three-phase breaker 80 is connected with the three-phase input end of the high voltage converter 60 of accompanying survey, to form self circular loop, wherein: the synchronization function of enable high voltage converter 10 to be measured, make the voltage magnitude of the input voltage of the high voltage converter 60 of accompanying survey, the voltage magnitude of the output voltage of frequency and phase place and high voltage converter 10 to be measured self, frequency and phase place are consistent respectively, to meet the same period and the stable operation requirement of self circular loop, the output frequency of the high voltage converter 60 of survey is accompanied to differ from the output frequency of high voltage converter 10 to be measured.
When high-voltage fence 40 capacity less or second-rate time, can additionally add stable-pressure device 100 between high-voltage fence 40 and wave filter 90.In other words, when high-voltage fence 40 quality is better, stable-pressure device 100 can not be set, now think that the amplitude of the voltage that high-voltage fence 40 exports, frequency, phase place are all very stable.
In actual design, wave filter 90 is chosen as LC low-pass filter.
In the present invention, high voltage converter 10 to be measured is the follow-up actual high voltage converter carrying out testing, the high voltage converter 60 of survey is accompanied to be help high voltage converter 10 to be measured effectively to carry out follow-up test, and the high voltage converter set up when building self-loopa test macro.
In the present invention, the effect of stable-pressure device 100 is, for below accompany survey, high voltage converter 60,10 to be measured provides power attenuation, and the quadergy completed between high voltage converter 10 to be measured exchanges.The effect of wave filter 90 is smooth voltage waveform, ensures that sampled point is enough stable.Accompany the frequency that the high voltage converter 60 of survey is mainly used between differenceization self input side and outgoing side.High voltage converter 10 to be measured is mainly used in follow-uply carrying out the tests such as load capacity, total power are aging, phase-shifting transformer temperature rise, power cell temperature rise.The effect of three-phase breaker 80 is the reliable disjunction ensureing self circular loop.
In the present invention, to to be measured, that accompany survey high voltage converter 10,60, the input of stable-pressure device 100 etc., output voltage collection by arranging voltage sensor to realize on input terminal, lead-out terminal, this is well known technology, does not here describe in detail.
In the present invention, stable-pressure device 100, wave filter 90, three-phase reactor 70 and three-phase breaker 80 are the well-known devices of this area, therefore its concrete formation does not here describe in detail.
The high voltage converter that self-loopa test macro of the present invention is applicable to have three-phase input-single-phase output type power cell carries out the tests such as load capacity, total power are aging, phase-shifting transformer temperature rise, power cell temperature rise, such as: high voltage converter 10,60 to be measured, to accompany survey can be the clamped formula high voltage converter (5-levelH-bridgeNaturalPointClampedInverter) of 5 level H-bridge mid point or Cascade H bridge multi-level high-voltage frequency transformer (CascadedH-bridgeMultilevelInverter, referred to as cascaded high-voltage frequency converter) etc. simultaneously.
As shown in Figure 1, it comprises high-voltage power supply 11, phase-shifting transformer 12 to cascaded high-voltage frequency converter, by 3 × n power cell 131, (Fig. 1 shows 3 × n power cell C
1w~ C
nw, C
1v~ C
nv, C
1u~ C
nusituation) power circuit 13 that forms, high-voltage power supply 11 is connected with power circuit 13 via phase-shifting transformer 12, power circuit 13 1 aspect is connected with high-voltage motor 50, on the other hand, in it, each power cell 131 is connected with Main Control Tank (not shown) via optical fiber interface plate, controls by Main Control Tank.Phase-shifting transformer 12 comprises three-phase coil winding (i.e. A, B, C phase coil winding) and the secondary side phase-shifting unit of primary side star or triangle connection.High-voltage power supply 11 can be substituted by high-voltage fence 40.Phase-shifting transformer 12 can be dry-type transformer or transformer invaded by oil.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 concrete formation does not here describe in detail.
In the present invention, for cascaded high-voltage frequency converter, because phase-shifting transformer 12 can ensure that input power factor is very high, so can think to accompany between the cascaded high-voltage frequency converter of survey and cascaded high-voltage frequency converter to be measured only have active power transmission.Power cell 131 due to cascaded high-voltage frequency converter all adopts diode rectification (as Fig. 2), only can unidirectional delivery active power, so the reactive power of cascaded high-voltage frequency converter to be measured can only exchange with the inverter side of stable-pressure device 100, or directly feed back to high-voltage fence 40, that is reactive power does not flow through self circular loop.
The structural framing of 5 level H-bridge mid point clamped formula high voltage converter is roughly similar with cascaded high-voltage frequency converter, also high-voltage power supply (can be substituted by high-voltage fence), phase-shifting transformer, the power circuit that is made up of 5 power cells is mainly comprised, it is the existing device of this area, therefore its concrete formation does not here describe in detail, please refer to cascaded high-voltage frequency converter to understand.
The situation of stable-pressure device 100 is not set for the invention described above self-loopa test macro, the invention allows for a kind of adjustment method, comprise the steps:
1) three-phase breaker 80 separating brake (disconnection) of self circular loop is made, and guarantee the safe and effective connection of accompanying the high voltage converter 60 of survey, high voltage converter 10 to be measured and whole self-loopa test macro, now, accompany the input voltage of display on the high voltage converter 60 of survey and high voltage converter 10 to be measured to be the magnitude of voltage of high-voltage fence 40, but high voltage converter 10 in fact to be measured does not truly power on;
2) start and regulate the high voltage converter 60 of accompanying survey, order accompanies the frequency of the output voltage of the high voltage converter 60 of survey to differ from the electric voltage frequency of high-voltage fence 40 output, such as, the voltage that high-voltage fence 40 exports is 6.6kV, and frequency is 50Hz, so adjustable high voltage converter 60 of accompanying survey, the frequency of its output voltage is made to be 51Hz, and voltage magnitude unrestricted, now, high voltage converter 10 to be measured truly powers on;
3) start high voltage converter 10 to be measured and the synchronization function of enable high voltage converter 10 to be measured (synchronization function is a kind of regulatory function that high voltage converter self has, for known technology), make to accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter 60 of survey, frequency and phase place and high voltage converter 10 to be measured self, frequency and phase place to be consistent respectively, namely achieve the output frequency of accompanying the output frequency of the high voltage converter 60 of survey to differ from high voltage converter 10 to be measured;
4) make three-phase breaker 80 close a floodgate (closing), now self circular loop has Weak current to pass through;
5) regulate high voltage converter 10 to be measured synchronous coefficient and the same period angle offset, change the output current of high voltage converter 10 to be measured and output power factor and meet the test carried out in advance (as load capacity, total power is aging, phase-shifting transformer temperature rise, the tests such as power cell temperature rise) demand, in other words, in the process of carrying out a certain test, according to the size of the output current of the required high voltage converter 10 to be measured of this test and output power factor number, the output current of high voltage converter 10 to be measured and output power factor are regulated, what this was this area knows technology.
After debugged the self-loopa test macro that stable-pressure device 100 is not set by the invention described above method, high voltage converter 10 to be measured just can carry out the tests such as load capacity, total power are aging, phase-shifting transformer temperature rise, power cell temperature rise, test the test data accuracy obtained can effectively be ensured, and test data can truly reflect application operating mode.
In reality is implemented, the difference between the electric voltage frequency of accompanying the frequency of the output voltage of the high voltage converter 60 of survey and high-voltage fence 40 to export preferably controls between ± 2Hz.Such as, the voltage that high-voltage fence 40 exports is 6.6kV, frequency is 50Hz, so preferably, the frequency of the output voltage of the high voltage converter 60 of survey of accompanying after adjustment is between 48Hz ~ 52Hz, and its voltage magnitude can be identical with the voltage magnitude that high-voltage fence 40 exports, be 6.6kV, but be not limited thereto.
Be provided with the situation of stable-pressure device 100 for the invention described above self-loopa test macro, the invention allows for a kind of adjustment method, comprise the steps:
1) make three-phase breaker 80 separating brake (disconnection) of self circular loop, and guarantee stable-pressure device 100, accompany the high voltage converter 60 of survey, the safe and effective connection of high voltage converter 10 to be measured and whole self-loopa test macro;
2) start and regulate stable-pressure device 100, make that the frequency of the output voltage of stable-pressure device 100 remains preset frequency and voltage magnitude is a certain numerical value, the voltage magnitude of the output voltage of stable-pressure device 100 is such as made to be that 6.6kV, frequency stabilization are at 50Hz, now, the input voltage of to accompany on the high voltage converter 60 of survey and high voltage converter 10 to be measured display i.e. 6.6kV for this reason, but high voltage converter 10 in fact to be measured does not truly power on;
3) start and regulate the high voltage converter 60 of accompanying survey, order accompanies the frequency of the output voltage of the high voltage converter 60 of survey to differ from the preset frequency of the output voltage of stable-pressure device 100, such as, the output voltage of stable-pressure device 100 is 6.6kV, and frequency is 50Hz, so adjustable high voltage converter 60 of accompanying survey, the frequency of its output voltage is made to be 51Hz, and voltage magnitude unrestricted, now, high voltage converter 10 to be measured truly powers on;
4) start high voltage converter 10 to be measured and the synchronization function of enable high voltage converter 10 to be measured (synchronization function is a kind of regulatory function that high voltage converter self has, for known technology), make to accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter 60 of survey, frequency and phase place and high voltage converter 10 to be measured self, frequency and phase place to be consistent respectively, namely achieve the output frequency of accompanying the output frequency of the high voltage converter 60 of survey to differ from high voltage converter 10 to be measured;
5) make three-phase breaker close a floodgate (closing), now self circular loop has Weak current to pass through;
6) regulate high voltage converter 10 to be measured synchronous coefficient and the same period angle offset, change the output current of high voltage converter 10 to be measured and output power factor and meet the test carried out in advance (as load capacity, total power is aging, phase-shifting transformer temperature rise, the tests such as power cell temperature rise) demand, in other words, carrying out in a certain test, according to the size of the output current of the required high voltage converter 10 to be measured of this test and output power factor number, the output current of high voltage converter 10 to be measured and output power factor are regulated, what this was this area knows technology.
After debugged the self-loopa test macro being provided with stable-pressure device 100 by the inventive method, high voltage converter 10 to be measured just can carry out the tests such as load capacity, total power are aging, phase-shifting transformer temperature rise, power cell temperature rise, test the test data accuracy obtained can effectively be ensured, and test data can truly reflect application operating mode.
In reality is implemented, the difference between the preset frequency of the frequency of the output voltage of the high voltage converter 60 of survey and the output voltage of stable-pressure device 100 is accompanied preferably to control between ± 2Hz.Such as, the output voltage of stable-pressure device 100 is 6.6kV, frequency is 50Hz, so preferably, the frequency of the output voltage of the high voltage converter 60 of survey of accompanying after adjustment is between 48Hz ~ 52Hz, and its voltage magnitude can be identical with the voltage magnitude of the output voltage of stable-pressure device 100, be 6.6kV, but be not limited thereto.
Feature of the present invention is to add the high voltage converter 60 of accompanying survey of one-level for differenceization input and output frequency, and, the present invention is when applying the synchronization function of high voltage converter 10 to be measured, the input voltage sampled point of high voltage converter 10 to be measured is made to have moved on on the input terminal of the high voltage converter 60 of accompanying survey, but the output voltage sampled point of high voltage converter 10 to be measured is constant, or on the lead-out terminal of himself.
Can see from theoretical research and the actual running results, when accompany survey, high voltage converter 60,10 to be measured input and output frequency unequal time, the three-phase input current of their power cell can cyclic balance regularly, that is under a certain cycle, the effective value of three-phase input current is equal, this just directly can eliminate traditional self-loopa band and carries the unbalanced problem of power cell three-phase input current in test macro thus, thus system application operating mode can be reflected more truly, bring following series of advantages.
It should be noted that, because high voltage converter reaches energy-saving effect in advance, its output frequency is seldom at 50Hz long-play, so seldom there will be the problem of phase-shifting transformer damage, and the present invention is normally in order to the needs meeting dispatch from the factory test and research and development test adopt.
Advantage of the present invention is:
1, present invention effectively avoids traditional self-loopa band and carry the unbalanced problem of power cell three-phase input current in test macro, make the three-phase input current of power cell that certain phase input current can not occur and continue phenomenon bigger than normal, thus high voltage converter to be measured is building and can the long-time continuous service of full power in the self-loopa test macro of the present invention debugged, carry out the load capacity of high voltage converter, total power is aging, phase-shifting transformer temperature rise, the tests such as power cell temperature rise, and guarantee the accurate of test data, truly, test data can truly reflect application operating mode, particularly in temperature rise test, some winding can be prevented because of overheated insulation degradation, cause excessive fatigue and burn phase-shifting transformer, cause the problem of testing and cannot complete.
2, self-loopa test macro of the present invention builds convenient, and simulation application operating mode is true, can to meet in test process with fully loaded demand, meet long playing demand during temperature rise test.
3, the present invention is by being simulation inductive load, capacitive load by power factor regulation, carries out the application simulation of asynchronous machine, synchronous motor respectively.
4, the present invention is applicable to the self-loopa test of the high voltage converter with three-phase input-single-phase output type power cell, the such as clamped formula high voltage converter of 5 level H-bridge mid point, Cascade H bridge multi-level high-voltage frequency transformer.
The above know-why being preferred embodiment of the present invention and using; for a person skilled in the art; when not deviating from the spirit and scope of the present invention; any based on apparent changes such as the equivalent transformation on technical solution of the present invention basis, simple replacements, all belong within scope.
Claims (10)
1. a novel high voltage converter self-loopa test macro, it is characterized in that: it comprises wave filter, accompany the high voltage converter of 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 via the three-phase input end of accompanying the high voltage converter of survey with 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 is connected with the three-phase input end of the high voltage converter of accompanying survey, to form self circular loop, wherein: the synchronization function of enable high voltage converter to be measured, make the voltage magnitude of the input voltage of the high voltage converter of accompanying survey, the voltage magnitude of the output voltage of frequency and phase place and high voltage converter to be measured, frequency and phase place are consistent respectively, the output frequency of the high voltage converter of survey is accompanied to differ from the output frequency of high voltage converter to be measured.
2. high voltage converter self-loopa test macro novel as claimed in claim 1, is characterized in that:
Stable-pressure device is connected with between described high-voltage fence and described wave filter.
3. high voltage converter self-loopa test macro novel as claimed in claim 1, is characterized in that:
Described wave filter is LC low-pass filter.
4. high voltage converter self-loopa test macro novel as claimed in claim 1, is characterized in that:
Describedly accompany the high voltage converter of survey, described high voltage converter to be measured is the clamped formula high voltage converter of 5 level H-bridge mid point or Cascade H bridge multi-level high-voltage frequency transformer.
5. an adjustment method for the novel high voltage converter self-loopa test macro described in the claims 1, it is characterized in that, it comprises step:
1) described three-phase breaker separating brake is made;
2) start and accompany the high voltage converter of survey described in regulating, described in order, accompanying the frequency of the output voltage of the high voltage converter of survey to differ from the electric voltage frequency of described high-voltage fence;
3) start described high voltage converter to be measured and the synchronization function of enable described high voltage converter to be measured, described in making, accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter of survey, frequency and phase place and described high voltage converter to be measured, frequency and phase place to be consistent respectively;
4) described three-phase breaker is made to close a floodgate;
5) regulate described high voltage converter to be measured synchronous coefficient and the same period angle offset, the output current and the output power factor that change described high voltage converter to be measured meet the testing requirement of carrying out in advance.
6. method as claimed in claim 5, is characterized in that:
Difference between described electric voltage frequency of accompanying the frequency of the output voltage of the high voltage converter of survey and described high-voltage fence is between ± 2Hz.
7. the method as described in claim 5 or 6, is characterized in that:
Describedly accompany the high voltage converter of survey, described high voltage converter to be measured is the clamped formula high voltage converter of 5 level H-bridge mid point or Cascade H bridge multi-level high-voltage frequency transformer.
8. an adjustment method for the novel high voltage converter self-loopa test macro described in the claims 2, it is characterized in that, it comprises step:
1) described three-phase breaker separating brake is made;
2) start and regulate described stable-pressure device, making the frequency of the output voltage of described stable-pressure device remain preset frequency;
3) start and accompany the high voltage converter of survey described in regulating, described in order, accompanying the frequency of the output voltage of the high voltage converter of survey to differ from the preset frequency of the output voltage of described stable-pressure device;
4) start described high voltage converter to be measured and the synchronization function of enable described high voltage converter to be measured, described in making, accompany the voltage magnitude of the output voltage of the voltage magnitude of the input voltage of the high voltage converter of survey, frequency and phase place and described high voltage converter to be measured, frequency and phase place to be consistent respectively;
5) described three-phase breaker is made to close a floodgate;
6) regulate described high voltage converter to be measured synchronous coefficient and the same period angle offset, the output current and the output power factor that change described high voltage converter to be measured meet the testing requirement of carrying out in advance.
9. method as claimed in claim 8, is characterized in that:
Difference between described preset frequency of accompanying the output voltage of the frequency of the output voltage of the high voltage converter of survey and described stable-pressure device is between ± 2Hz.
10. method as claimed in claim 8 or 9, is characterized in that:
Describedly accompany the high voltage converter of survey, described high voltage converter to be measured is the clamped formula high voltage converter of 5 level H-bridge mid point or Cascade H bridge multi-level high-voltage frequency transformer.
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| CN201510536379.2A CN105116256B (en) | 2015-08-27 | 2015-08-27 | A kind of new high voltage converter self-loopa test system and its adjustment method |
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| CN105785176A (en) * | 2016-03-11 | 2016-07-20 | 广东明阳龙源电力电子有限公司 | Testing platform for total-power wind-power converter with various specifications |
| CN107884634A (en) * | 2017-09-21 | 2018-04-06 | 北京机械设备研究所 | A kind of self-loopa method of testing of back-to-back converter |
| CN109470940A (en) * | 2017-09-07 | 2019-03-15 | 株洲变流技术国家工程研究中心有限公司 | A kind of current transformer full power trial (FPT) device and method |
| CN116106780A (en) * | 2023-04-13 | 2023-05-12 | 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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