CN103280982A - Control method for motor testing variable-frequency power supply - Google Patents
Control method for motor testing variable-frequency power supply Download PDFInfo
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- CN103280982A CN103280982A CN2013102036836A CN201310203683A CN103280982A CN 103280982 A CN103280982 A CN 103280982A CN 2013102036836 A CN2013102036836 A CN 2013102036836A CN 201310203683 A CN201310203683 A CN 201310203683A CN 103280982 A CN103280982 A CN 103280982A
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Abstract
The invention discloses a control method for a motor testing variable-frequency power supply. A motor testing variable-frequency power supply system comprises two four-quadrant cascade frequency converters, motors and a contactor, wherein the two four-quadrant cascade frequency converters are used for respectively dragging one motor to work or simultaneously dragging two motors which are connected rigidly and coaxially to perform dragging test. When the two four-quadrant cascade frequency converters run independently, the contactor is switched off to complete motor test of different voltage levels respectively. When the two four-quadrant cascade frequency converters run independently, the contactor is switched off; and when the two motors are connected rigidly and coaxially, motor dragging test of different voltage levels is completed. When the two four-quadrant cascade frequency converters run in parallel, the contactor is switched on to complete motor test of higher capacity levels. Due to the adoption of the control method, the driving capability of the power supply system can be increased greatly, dual motors can be driven in parallel or driven independently, relevant test requirements of motors of different voltage levels and different capacities can be met, and four-quadrant transmission can be realized.
Description
Technical field
The present invention relates to a kind of electric power system control method, especially relate to a kind of frequency-converting power supply control method that is applied to the energy feedback type motor test.
Background technology
Motor is widely used in industries such as power plant, oil field, petrochemical industry, mine, metallurgy, chemical industry, building materials.In recent years, vigorous day by day to the market demand of motor along with the fast development of Chinese national economy, also more and more higher to the requirement of motor quality.Motor test is one of important means of check motor quality, its accuracy and reliability and motor test power supply fine or not closely related.In electromechanics trade, mainly adopted generating set to carry out motor test as motor test equipment in the past, this method is subjected to the restriction of place capacity, can't satisfy the motor test requirement under big capacity low frequency situation.Along with the development of power electronic technology, variable frequency power supply progressively is applied in motor test.The electric motor test device of employing variable frequency power supply has solved conventional rack scheme little difficult point of power when low frequency, compares with the conventional rack power supply to have advantages such as energy-conservation, that noise is little, power is big.
In the prior art, it is related to the present invention to mainly contain following three pieces of documents:
As shown in Figure 1, prior art 1 is published in paper " application of frequency conversion experiment power supply in motor test " on " Semiconductor Converting Technology and electric traction " fifth phase in 2007 for containing monarch, Zhang Min in May, 2007.Prior art 1 adopts the variable frequency power supply scheme of " input transformer+phase controlled rectifier+inverter+step-up transformer ".The three phase network input voltage is sent into silicon controlled rectifier through input transformer output three-phase alternating current adjustable voltage, and the direct voltage of silicon controlled rectifier output is through supplying with motor by the voltage of step-up transformer output variable voltage variable frequency after the filtering.But prior art 1 is because the components and parts thyristor that the phase control rectifier bridge adopts belongs to the half control device, and when carrying out the energy feedback, harmonic wave of output voltage is abundant, and is serious to electric network pollution.And when multi-voltage grade is exported, realize by output transformer entirely, output transformer is required height, the big cost height of manufacture difficulty.
As shown in Figure 2, prior art 2 was published in paper " system research of energy feedback type motor test platform " on " communication power supply technology " the 2nd phase the 27th volume in 2010 for people such as health and happiness, Ji Kai on March 25th, 2010.Prior art 3 is published in paper " frequency converter is in the application of general large-size machine pilot system " on " the frequency converter world " the 12nd phase in 2009 for people such as Ji Kai, health and happiness in December, 2009.Prior art 2 and prior art 3 adopt the energy circulation scheme of dc bus altogether, and the inversion unit of motor-driven and energy feedback adopts the mode of public dc bus, effectively utilizes common DC bus to carry out the circulation of electric flux.Rectifying part provides stable DC bus-bar voltage, and electrical network only need provide the energy of system loss, and this Energy Saving Control mode is fairly simple, is easier to realize.But prior art 2 and 3 adopts the energy circulation scheme of dc bus altogether, and its output harmonic wave content is big, and needing increases special output filter, and can not realize the rated capacity output of multi-voltage grade.
Summary of the invention
The purpose of this invention is to provide a kind of motor test variable frequency power supply control method, this method can improve the driving force of power-supply system greatly, can the two-shipper parallel connection drive or independent independent the driving, thereby satisfy the correlation test requirement of different electric pressure different capabilities motors, and can realize the four-quadrant transmission of motor.
In order to realize the foregoing invention purpose, the present invention specifically provides a kind of technic relization scheme of motor test frequency-converting power supply control method, a kind of motor test frequency-converting power supply control method, described motor test frequency-converting power supply comprises: two four-quadrant cascade connection type frequency converters, motor and contactors;
Described two four-quadrant cascade connection type frequency converters drag a described machine operation respectively or drag the motor that two rigid coaxial connect simultaneously and carry out mechanical back to back test;
When described two four-quadrant cascade connection type frequency converter independent operatings, described contactor disconnects, and finishes the motor test of different electric pressures respectively;
When described two four-quadrant cascade connection type frequency converter independent operatings, described contactor disconnects, and when described two motor rigid coaxial connect, finishes the motor mechanical back to back test of different electric pressures;
When described two four-quadrant cascade connection type frequency converter parallel runnings, described contactor closure is finished the more motor test of high power capacity grade.
Preferably, when described contactor disconnects, during two four-quadrant cascade connection type frequency converter independent operatings, finish maximum 2500KVA capacity, different electric pressure motors comprise no-load characteristic test, the folded correlation test of temperature rise test frequently;
When described contactor disconnects, when two motor rigid coaxial connect, carry out maximum 2500kVA capacity, different electric pressure motors comprise dragging the correlation test of temperature rise test, load characteristic test;
When two four-quadrant cascade connection type frequency converter parallel runnings, described contactor closure is finished maximum 5000KVA capacity, and different electric pressure motors comprise no-load characteristic test, the folded correlation test of temperature rise test frequently.
Preferably, described four-quadrant cascade connection type frequency converter further comprises phase shifting transformer, high-voltage charging circuit, frequency-variable module and contactor combination.Every individual basic unsteady flow chain of 2n that further comprises mutually of described frequency-variable module, n 〉=1, described basic unsteady flow chain comprises power cell and equalizing reactor.Change the series and parallel mode of each basic unsteady flow chain by the on off state that changes each contactor in the contactor combination, realize the maximum output that is respectively 3.45KV, 6.9KV, three electric pressure rated capacities of 13.8KV.
Preferably, described power cell further comprises Three-Phase PWM Rectifier, intermediate dc link and H bridge inverter.Described motor test frequency-converting power supply control method further comprises the Three-Phase PWM Rectifier control procedure, and described Three-Phase PWM Rectifier control procedure comprises outer voltage control procedure and current inner loop control procedure;
The outer voltage control procedure compares according to measured value and the DC bus-bar voltage set-point of DC bus-bar voltage, forms voltage close loop control, exports the given amplitude of three-phase input current, further obtains the set-point of three-phase input AC electric current;
The current inner loop control procedure compares by the measured value of three-phase input AC electric current and the set-point of three-phase input AC electric current, forms current closed-loop control, the drive control signal of output Three-Phase PWM Rectifier switching device.
Preferably, described outer voltage control procedure further may further comprise the steps:
S101: gather DC bus-bar voltage Udc, and carry out filtering and handle;
S102: after the DC bus-bar voltage Udc that handles through filtering and DC bus-bar voltage set-point Udc* compare and regulate with PI, export the given amplitude I of three-phase input current;
S103: gather the instantaneous value of three-phase input voltage, obtain the three-phase standard sine wave identical with the AC-input voltage phase place through phase-locked processing;
S104: the given amplitude I of described three-phase standard sine wave and described three-phase input current multiplies each other, and obtains the set-point iN* of three-phase input AC electric current.
Preferably, described current inner loop control procedure further may further comprise the steps:
S201: gather three-phase input current signal iN, and carry out filtering and handle;
S202: the set-point iN* of described three-phase input current signal iN and three-phase input current compares and obtains difference signal iN*-iN;
S203: relatively the difference signal iN*-iN of gained keeps through over-sampling, carries out hysteresis current control again and obtains the PWM triggering signal, as the switching device drive control signal of described Three-Phase PWM Rectifier.
Preferably, described motor test frequency-converting power supply control method also comprises H bridge inverter control procedure, and described H bridge inverter control procedure further comprises shunt chopper output voltage control procedure and shunt chopper circulation control procedure.Given motor current signal im* and actual motor current signal im relatively produce voltage reference signal by overcurrent control.Each H bridge inverter output current obtains described H bridge inverter current average signal as current reference signal through after the equal divisional processing averaged.Each H bridge inverter output current is compared the back as the circulation signal with described current reference signal, produce regulation voltage signal through sharing control, described regulation voltage signal and described voltage reference signal are handled through space vector pulse width modulation after relatively, as the control voltage of each H bridge inverter.
Preferably, described shunt chopper output voltage control procedure further may further comprise the steps:
S301: gather motor current signal im, and carry out filtering and handle;
S302: after given motor current signal im* and described motor current signal im compared processing, produce difference signal im*-im and carry out Current Control and obtain voltage reference signal;
S303: described voltage reference signal carries out space vector pulse width modulation through Synchronization Control and the adjustment voltage signal that produces through sharing control after relatively again to be handled, and obtains the drive control signal of described each switching device of H bridge inverter.
Preferably, described shunt chopper circulation control procedure further may further comprise the steps:
S401: gather the output current of described H bridge inverter, carry out that filtering is handled and averaged after, obtain the output current mean value of described H bridge inverter as current reference signal;
S402: the output current signal of each H bridge inverter and described current reference signal obtain the circulation signal after relatively;
S403: described circulation signal is carried out sharing control, produce and adjust voltage signal.
By implementing the technical scheme of a kind of motor test frequency-converting power supply of the invention described above control method, have following technique effect:
(1) the present invention can improve the driving force of power-supply system greatly, can the two-shipper parallel connection drive or independent independent the driving, can satisfy the correlation test requirement of different electric pressure different capabilities motors, and can realize the four-quadrant transmission of motor;
(2) the present invention singly overlap variable frequency power supply with n H bridge power unit and the series connection of reactor as a basic unsteady flow chain, different on off states by contactor, change the series and parallel combining form of a plurality of basic unsteady flow chains, can realize the rated capacity output of multiple voltage grade;
(3) each basic unsteady flow chain of the present invention all is connected with equalizing reactor, parallel current-sharing is respond well, the circulation phenomenon that has produced when having avoided basic unsteady flow chain in parallel, guaranteed the specified output of a plurality of electric pressures of circuit, strobe for series connection output simultaneously, guaranteed the output waveform quality of frequency-converting power supply;
(4) the present invention substitutes diode rectifier by adopting Three-Phase PWM Rectifier, introduce phase-shifting carrier wave SPWM technology and be connected in series equalizing reactor at output, the motor test supply unit voltage on line side harmonic wave that has solved the application of prior art control method is abundant, serious to electric network pollution, the input current low-order harmonic is bigger, the technical problem that energy can only one-way flow.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is that the structure of the frequency conversion experiment power supply used in motor test of prior art 1 is formed schematic diagram.
Fig. 2 is that the structure of prior art 2 energy feedback type motor test plateform systems is formed schematic diagram.
Fig. 3 is the system architecture diagram of a kind of embodiment of motor test frequency-converting power supply among the present invention.
Fig. 4 is the basic unsteady flow chain equivalent schematic that list overlaps frequency converter in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Fig. 5 is the circuit topological structure figure that singly overlaps frequency converter among the present invention in a kind of embodiment of motor test frequency-converting power supply.
Fig. 6 is the main circuit equivalent schematic of motor test frequency-converting power supply under 13.8KV electric pressure output mode among the present invention.
Fig. 7 is the main circuit equivalent schematic of motor test frequency-converting power supply under 6.9KV electric pressure output mode among the present invention.
Fig. 8 is the main circuit equivalent schematic of motor test frequency-converting power supply under 3.45KV electric pressure output mode among the present invention.
Fig. 9 is the topology diagram of power cell in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 10 is Three-Phase PWM Rectifier control principle block diagram in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 11 is the functional block diagram of outer voltage control module in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 12 is the functional block diagram of current inner loop control module in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 13 is the functional block diagram of H bridge inverter control module in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 14 is the functional block diagram of shunt chopper output voltage controlling unit in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 15 is the functional block diagram of shunt chopper circulation controlling unit in a kind of embodiment of motor test frequency-converting power supply among the present invention.
Figure 16 is the control flow schematic diagram in a kind of embodiment of motor test frequency-converting power supply control method of the present invention.
Figure 17 is the control flow schematic diagram of outer voltage control procedure in a kind of embodiment of motor test frequency-converting power supply control method of the present invention.
Figure 18 is the control flow schematic diagram of current inner loop control procedure in a kind of embodiment of motor test frequency-converting power supply control method of the present invention.
Figure 19 is the control flow schematic diagram of shunt chopper output voltage control procedure in a kind of embodiment of motor test frequency-converting power supply control method of the present invention.
Figure 20 is the control flow schematic diagram of shunt chopper circulation control procedure in a kind of embodiment of motor test frequency-converting power supply control method of the present invention.
Among the figure: 1-four-quadrant cascade connection type frequency converter, 2-motor, 3-phase shifting transformer, the 4-frequency-variable module, 5-basis unsteady flow chain, 6-high-voltage charging circuit, the 7-power cell, 8-Three-Phase PWM Rectifier, 9-intermediate dc link, the 10-H bridge inverter, the 11-first sampling filter unit, 12-PI regulon, the 13-second sampling filter unit, the 14-phase locked-loop unit, 15-multiplication unit, 16-the 3rd sampling filter unit, the 17-sample holding unit, 18-current hysteresis ring control unit, 19-current controller, 20-equalizing controller, 21-space vector pulse width modulation unit, the equal subdivision of 22-, 23-the 4th sampling filter unit, 24-the 5th sampling filter unit.
Embodiment
For quote and know for the purpose of, with the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be described below:
PWM:Pulse Width Modulation, the abbreviation of pulse width modulation;
SPWM:Sinusoidal Pulse Width Modulation, the abbreviation of sine wave pulse width modulated;
SVPWM:Space Vector Pulse Width Modulation, the abbreviation of space vector pulse duration modulation;
PLL:Phase-locked loops, the abbreviation of phase-locked loop is a kind of frequency of feedback control principle realization and simultaneous techniques of phase place utilized;
PI regulates: Proportional Integral Control, the abbreviation that proportional integral is regulated.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As accompanying drawing 3 to shown in the accompanying drawing 20, provided a kind of motor test frequency-converting power supply of the present invention control method, and the applied motor test frequency-converting power supply of this method specific embodiment, the invention will be further described below in conjunction with the drawings and specific embodiments.
Be the embodiment of the applied a kind of motor test frequency-converting power supply of the present invention as shown in Figure 3, comprise: two four-quadrant cascade connection type frequency converters 1, motor 2 and contactor KM3.Two four-quadrant cascade connection type frequency converters 1 drag 2 work of a motor respectively or drag the motor 2 that two rigid coaxial connect simultaneously and carry out mechanical back to back test.When two four-quadrant cascade connection type frequency converter 1 independent operatings, contactor KM3 disconnects, and finishes motor 2 tests of different electric pressures respectively; When two four-quadrant cascade connection type frequency converter 1 independent operatings, contactor KM3 disconnects, and when two motor 2 rigid coaxial connect, finishes motor 2 mechanical back to back test of different electric pressures; When two four-quadrant cascade connection type frequency converter 1 parallel runnings, contactor KM3 closure is finished more motor 2 tests of high power capacity grade.The technical scheme that the specific embodiment of the invention is described adopts two covers can realize the four-quadrant cascade connection type frequency converter of multi-voltage grade rated capacity output.Two cover four-quadrant cascade connection type frequency converters 1 can drag 2 work of a motor respectively, and the motor 2 that also can drag two rigid coaxial connections simultaneously carries out mechanical back to back test.1 parallel running of two cover four-quadrant cascade connection type frequency converters can improve the driving force of test frequency-converting power supply greatly, and by being converted into the separate unit operation after the software and hardware setting, have good drive ability.In addition, drive or independent driving separately by two-shipper is in parallel, can satisfy the correlation test requirement of different electric pressure different capabilities motors 2, and realize the four-quadrant transmission requirement of motor 2.
As a kind of exemplary embodiment of the present invention, when contactor KM3 disconnects, during two four-quadrant cascade connection type frequency converter 1 independent operatings, finish maximum 2500KVA capacity, different electric pressure motors 2 comprise no-load characteristic test, the folded correlation test of temperature rise test frequently; When contactor KM3 disconnects, when two motor 2 rigid coaxial connect, carry out maximum 2500kVA capacity, different electric pressure motors 2 comprise dragging the correlation test of temperature rise test, load characteristic test; When two four-quadrant cascade connection type frequency converter 1 parallel runnings, contactor KM3 closure is finished maximum 5000KVA capacity, and different electric pressure motors 2 comprise no-load characteristic test, the folded correlation test of temperature rise test frequently.
Four-quadrant cascade connection type frequency converter 1 further comprises phase shifting transformer 3, high-voltage charging circuit 6, frequency-variable module 4 and contactor combination.High-voltage charging circuit 6 links to each other with phase shifting transformer 3, and frequency-variable module 4 links to each other with phase shifting transformer 3, and the contactor combination links to each other with frequency-variable module 4.The every of frequency-variable module 4 further comprises 2 mutually
nIndividual basic unsteady flow chain 5, n 〉=1, basic unsteady flow chain 5 comprises power cell 7 and equalizing reactor L, power cell 7 adopts the H bridge power unit.The equivalent schematic of basis unsteady flow chain 5 as shown in Figure 4, the rated output voltage 670V of power cell 7, each basic unsteady flow chain 5 is made up of three power cells 7 and an equalizing reactor L, satisfies the requirement of electric power system minimum 3KV voltage fan-out capability.For the requirement of different electric power, the quantity of the power cell 7 of basic unsteady flow chain 5 series connection can change according to different system requirements, and its quantity n is determined by rated output voltage and system's minimum output voltage grade of power cell 7.Three-phase voltage enters phase shifting transformer 3 through high-voltage charging circuit 6, through after phase shifting transformer 3 step-downs being power cell 7 power supplies of frequency-variable module 4, power cell 7 is exported single phase alternating current (A.C.) voltage after over commutation, filtering and inversion, change the series and parallel mode of each basic unsteady flow chain 5 by the on off state that changes each contactor in the contactor combination, realize the output of different electric pressure rated capacities.
High-voltage charging circuit 6 further comprises the charging resistor R of three-phase and the bypass high voltage connector 1KM1 of three-phase, and every phase charging resistor R all is connected in parallel on the two ends of this phase bypass high voltage connector 1KM1, shoving when high-voltage charging circuit 6 is used for suppressing the high pressure combined floodgate.A winding of phase shifting transformer 3 adopts wye connection, and each secondary winding of phase shifting transformer 3 all adopts prolongs limit triangular form connection.Be connected by the three-phase inlet wire between the power cell 7 of the secondary winding of phase shifting transformer 3 and frequency-variable module 4.The switching device of power cell 7 can be IGBT or IGCT, IEGT etc. among the present invention.
Frequency-variable module 4 further comprises first basic unsteady flow chain combination 41, second basic unsteady flow chain combination the 42, the 3rd basic unsteady flow chain combination the 43 and the 4th basic unsteady flow chain combination 44, and each basic unsteady flow chain makes up corresponding one road three-phase output end.The contactor combination further comprises the first contactor 2KM1, the second contactor 2KM2, the 3rd contactor 2KM3, the 4th contactor 2KM4, the 5th contactor 2KM5, the 6th contactor 3KM1, the 7th contactor 3KM2 and the 8th contactor 3KM3.Contactor adopts high-pressure vacuum contactor.The first contactor 2KM1, the 3rd contactor 2KM3 and the 4th contactor 2KM4 are connected to the three-phase output end of first basic unsteady flow chain combination 41, second basic unsteady flow chain combination the 42 and the 3rd basic unsteady flow chain combination 43.The second contactor 2KM2 is connected between first basic unsteady flow chain the combination 41 and second basic unsteady flow chain combination 42.The 5th contactor 2KM5 is connected between the 3rd basic unsteady flow chain combination the 43 and the 4th basic unsteady flow chain combination 44.The 6th contactor 3KM1 is connected between the three-phase output end of the three-phase output end of first basic unsteady flow chain combination 41 and the second basic unsteady flow chain combination 42.The 7th contactor 3KM2 is connected between the three-phase output end of the three-phase output end of second basic unsteady flow chain combination 42 and the 3rd basic unsteady flow chain combination 43.The 8th contactor 3KM3 is connected between the three-phase output end of the three-phase output end of the 3rd basic unsteady flow chain combination 43 and the 4th basic unsteady flow chain combination 44.
As a kind of typical execution mode of the present invention, 10KV electrical network input three-phase voltage enters phase shifting transformer 3 through high-voltage charging circuit 6, through after phase shifting transformer 3 step-downs being power cell 7 power supplies.Power cell 7 is exported single phase alternating current (A.C.) voltage after over commutation, filtering and inversion.Basis unsteady flow chain 5 further comprises three power cells 7 and an equalizing reactor L, and power cell 7 is connected mutually with equalizing reactor L.As a kind of typical execution mode of the present invention, four-quadrant cascade connection type frequency converter 1 every comprises 4 basic unsteady flow chains 5 mutually, change the series and parallel mode of each basic unsteady flow chain 5 by the on off state that changes each contactor in the contactor combination, realize the maximum output that is respectively 3.45KV, 6.9KV, three electric pressure rated capacities of 13.8KV.
As shown in Figure 5, each basic unsteady flow chain combination further comprise 9 power cell 7(hereinafter to be referred as: module) and 3 equalizing reactor L.Wherein, the first basic unsteady flow chain combination 41 comprises modules A 1～A3, module B1～B3, module C1～C3, reactor L1, L2, L3; The second basic unsteady flow chain combination 42 comprises modules A 4～A6, module B4～B6, module C4～C6, reactor L4, L5, L6; The 3rd basic unsteady flow chain combination 43 comprises modules A 7～A9, module B7～B9, module C7～C9, reactor L7, L8, L9; The 4th basic unsteady flow chain combination 44 comprises modules A 10～A12, module B10～B12, module C10～C12, reactor L10, L11, L12.Each basic unsteady flow chain makes up the specified output of corresponding one road three-phase, be specially: the first basic unsteady flow chain makes up 41 corresponding three-phase output end U1, V1, W1, the second basic unsteady flow chain makes up 42 corresponding three-phase output end U3, V3, W3, the 3rd basic unsteady flow chain makes up 43 corresponding three-phase output end U4, V4, W4, and the 4th basic unsteady flow chain makes up 44 corresponding three-phase output end U2, V2, W2.
Motor test frequency-converting power supply provided by the invention, connect as a basic unsteady flow chain 5 with n power cell and a reactor, different on off states by each contactor, change the series and parallel combining form of a plurality of basic unsteady flow chains 5, realize the rated capacity output of multiple voltage grade.Each basic unsteady flow chain 5 is connected with equalizing reactor L, and parallel current-sharing is respond well, and the circulation phenomenon that has produced when having avoided the unsteady flow chain in parallel has guaranteed the specified output of a plurality of electric pressures of circuit.Play filter action for series connection output simultaneously, guaranteed the output waveform quality of four-quadrant cascade connection type frequency converter 1.
The motor test frequency-converting power supply that the specific embodiment of the invention is described can be realized 10MVA, the output of 3KV, 6KV, three kinds of electric pressure rated power of 10KV, and the rated output voltage of power cell 7 is 670V.In the specific embodiment of the present invention, the every of motor test frequency-converting power supply is made up of four basic unsteady flow chains 5, satisfies the requirement of the highest 10KV voltage of motor test frequency-converting power supply fan-out capability.The motor test frequency-converting power supply can change the series-parallel system of each basic unsteady flow chain 5 by the different on off states of contactor, realizes the output of maximum 3.45KV, 6.9KV, three electric pressure rated capacities of 13.8KV respectively.Phase-shifting carrier wave SPWM(sinusoidal pulse width modulation is adopted in the control of four-quadrant cascade connection type frequency converter 1) technology, its basic thought is to keep the waveform of modulation signal constant, and the triangular carrier signal of cascade module (power cell 7) is moved an angle.It is the sinusoidal wave of many level that this modulation system makes the overlaid waveforms of each cascade power cell output voltage.According to the difference of unsteady flow link series and parallel compound mode, also different to the phase-shifting carrier wave SPWM modulation system of each power cell 7.
Be the equivalent circuit diagram of motor test frequency-converting power supply under the specified output mode of the three-phase of 13.8KV electric pressure in a kind of embodiment as shown in Figure 6, the on off state of each contactor is as shown in table 1 below under this pattern.Under this pattern, whenever be in series by 4 basic unsteady flow chains 5, each basic unsteady flow chain 5 is in series by 3 670V power cells 7 and an equalizing reactor L.N1 is neutral point, and every power cell 7 and 4 equalizing reactor L by 12 frequency conversions are in series, and three-phase is star-like connection, and power output terminal is U2, V2, W2.Under this pattern, can realize the specified output of 13.8KV electric pressure, can drag the motor 2 of relevant voltage grade.
Each high-pressure vacuum contactor on off state tabulation under the table 113.8KV electric pressure output mode
| ? | 2KM1 | 2KM2 | 2KM3 | 2KM4 | 2KM5 | 3KM1 | 3KM2 | 3KM3 |
| State | Close a floodgate | Separating brake | Separating brake | Separating brake | Separating brake | Separating brake | Close a floodgate | Separating brake |
12 power cell 7(of every phase module under this pattern) cascade forms, and then the SPWM modulated carrier phase shift phase angle of each power cell 7 differs from 180 °/12=15 ° successively.The triangular carrier phase shift angle of 1～No. 12 module of every phase (comprising A1～A12 module, B1～B12 module, C1～C12 module) is followed successively by 0 °, 15 °, 30 °, 45 °, 60 °, 75 °, 90 °, 105 °, 120 °, 135 °, 150 °, 165 °.The basic unsteady flow chain 5 of each of same phase, namely 1～No. 3 module (comprising A1～A3 module, B1～B3 module, C1～C3 module) sinusoidal modulation wave, 4～No. 6 modules (comprising A4～A6 module, B4～B6 module, C4～C6 module) sinusoidal modulation wave, 7～No. 9 modules (comprising A7～A9 module, B7～B9 module, C7～C9 module) sinusoidal modulation wave and 10～No. 12 modules (comprising A10～A12 module, B10～B12 module, C10～C12 module) sinusoidal modulation wave adopt identical sinusoidal modulation signal.
Be the equivalent circuit diagram of motor test frequency-converting power supply under the specified output mode of the three-phase of 6.9KV electric pressure in the another kind of embodiment as shown in Figure 7, the on off state of each contactor is as shown in table 2 below under this pattern.Form two 6.9KV cascade connection type frequency converters under this pattern, every 6.9KV cascade connection type frequency converter is every to be in series by 2 basic unsteady flow chains 5, contains power cell 7 and two equalizing reactor L of 6 frequency conversions, and three-phase is star-like connection.N3 is neutral point, whenever comprises A1～A6 module, B1～B6 module, C1～C6 module by 1～No. 6 power cell 7() be in series, three-phase is star-like connection, forms first 6.9KV cascade connection type frequency converter, power output terminal is U1, V1, W1.N4 is neutral point, whenever comprises A7～A12 module, B7～B12 module, C7～C12 module by 7～No. 12 power cell 7() be in series, three-phase is star-like connection, forms second 6.9KV cascade connection type frequency converter, power output terminal is U2, V2, W2.Under this pattern, can realize the specified output of 6.9KV electric pressure, and drag the motor 2 of two relevant voltage grades.In addition, also can realize the parallel connection output of two four-quadrant cascade connection type frequency converters 1 by the different on off states of contactor.
Each high-pressure vacuum contactor on off state tabulation under the table 26.9KV electric pressure output mode
| ? | 2KM1 | 2KM2 | 2KM3 | 2KM4 | 2KM5 | 3KM1 | 3KM2 | 3KM3 |
| State | Separating brake | Separating brake | Close a floodgate | Close a floodgate | Separating brake | Separating brake | Separating brake | Separating brake |
Under this pattern, every output mutually by two basic unsteady flow chains 5 is composed in series, and comprises 6 power cells 7 and two equalizing reactor L, and then the phase angle of each power cell 7 triangular carrier differs from 180 °/6=30 ° successively.Article one, the waterfall sequence of unsteady flow link power unit 7 is 1 to 6, and the waterfall sequence of another unsteady flow link power in parallel unit 7 is 12 to 7.For guaranteeing the crash consistency of two link output voltage waveforms in parallel, 1～No. 6 module of every phase (comprising A1～A6 module, B1～B6 module, C1～C6 module) triangular carrier phase shift angle is followed successively by 0 °, 30 °, 60 °, 90 °, 120 °, 150 °, and 7～No. 12 modules of every phase (comprising A7～A12 module, B7～B12 module, C7～C12 module) triangular carrier phase shift angle is followed successively by 150 °, 120 °, 90 °, 60 °, 30 °, 0 °.The same basic unsteady flow chain that is in series 5 adopts identical modulation signal, adopt opposite polarity modulation signal between the basic unsteady flow chain 5 in parallel, namely 1～No. 6 module sinusoidal modulation wave adopts identical sinusoidal modulation signal, and 7～No. 12 the module sinusoidal modulation wave adopts opposite polarity sinusoidal modulation signal.
Be that the motor test frequency-converting power supply is at the equivalent circuit diagram under the specified output mode of the three-phase of 3.45KV electric pressure in the third embodiment as shown in Figure 8, the on off state of each contactor is as shown in table 3 below under this pattern.Under this pattern, form four 3.45KV cascade connection type frequency converters, the every of every 3.45KV cascade connection type frequency converter is made up of a basic unsteady flow chain 5, and three-phase is star-like connection.N2 is neutral point, whenever, be composed in series by 1～No. 3 power cell (7 comprise A1～A3 module, B1～B3 module, C1～C3 module) and equalizing reactor L, three-phase is star-like connection, forms first 3.45KV cascade connection type frequency converter, and power output terminal is U1, V1, W1; N2 is neutral point, whenever, comprise A4～A6 module, B4～B6 module, C4～C6 module by 4～No. 6 power cell 7() and equalizing reactor L be composed in series, three-phase is star-like connection, forms second 3.45KV cascade connection type frequency converter, and power output terminal is U3, V3, W3; N5 is neutral point, whenever, comprise A10～A12 module, B10～B12 module, C10～C12 module by 10～No. 12 power cell 7() and equalizing reactor L be composed in series, three-phase is star-like connection, forms the 3rd 3.45KV cascade connection type frequency converter, and power output terminal is U4, V4, W4; N5 is neutral point, whenever, comprise A7～A9 module, B7～B9 module, C7～C9 module by 7-9 power cell 7() and equalizing reactor L be composed in series, three-phase is star-like connection, forms the 4th 3.45KV cascade connection type frequency converter, and power output terminal is U2, V2, W2.Under this pattern, can realize the specified output of 3.45KV electric pressure, and drag the motor 2 of four relevant voltage grades.In addition, also can realize the parallel connection output of two, three and four four-quadrant cascade connection type frequency converters 1 by the different on off states of contactor.
Each high-pressure vacuum contactor on off state tabulation under the table 33.45KV electric pressure output mode
| ? | 2KM1 | 2KM2 | 2KM3 | 2KM4 | 2KM5 | 3KM1 | 3KM2 | 3KM3 |
| State | Separating brake | Close a floodgate | Separating brake | Separating brake | Close a floodgate | Separating brake | Separating brake | Separating brake |
Whenever under this pattern, be output as a basic unsteady flow chain 5 mutually, comprise that 3 power cells 7 and equalizing reactor L are composed in series, then the phase angle of each power cell 7 triangular carrier differs from 180 °/3=60 ° successively.The waterfall sequence of every unsteady flow link power unit 7 is 1 to 3,4 to 6,7 to 9,10 to 12.For guaranteeing the crash consistency of two link output voltage waveforms in parallel, 1～No. 3 module of every phase (comprises A1～A3 module, B1～B3 module, C1～C3 module) triangular carrier phase shift angle is followed successively by 0 °, 60 °, 120 °, 4～No. 6 module (comprises A4～A6 module, B4～B6 module, C4～C6 module) triangular carrier phase shift angle is followed successively by 120 °, 60 °, 0 °, 7～No. 9 module (comprises A7～A9 module, B7～B9 module, C7～C9 module) triangular carrier phase shift angle is followed successively by 0 °, 60 °, 120 °, 10～No. 12 module (comprises A10～A12 module, B10～B12 module, C10～C12 module) triangular carrier phase shift phase angle is followed successively by 120 °, 60 °, 0 °.1～No. 3 module of same phase adopts identical sinusoidal modulation signal with 7～No. 9 modules, and 4～No. 6 modules and 10～No. 12 modules adopt opposite polarity sinusoidal modulation signal.
As shown in Figure 9, power cell 7 further comprises Three-Phase PWM Rectifier 8, intermediate dc link 9 and H bridge inverter 10.Power cell 7 is by the secondary winding power supply of phase shifting transformer 3, and the three-phase alternating current adjustable voltage of phase shifting transformer 3 secondary windings is rectified into direct voltage through the Three-Phase PWM Rectifier 8 of power cell 7.Form stable DC bus-bar voltage after the filter capacitor filtering of direct voltage process intermediate dc link 9 and export H bridge inverter 10 to.H bridge inverter 10 is reverse into DC bus-bar voltage the alternating voltage output of variable voltage variable frequency.By adopting Three-Phase PWM Rectifier to substitute diode rectifier, introduce phase-shifting carrier wave SPWM technology, and at output serial connection equalizing reactor L, the motor test supply unit voltage on line side harmonic wave that has solved the application of prior art control method is abundant, serious to electric network pollution, the input current low-order harmonic is bigger, the technological deficiency that energy can only one-way flow.
As shown in Figure 10, the motor test frequency-converting power supply also comprises the Three-Phase PWM Rectifier control module, and the Three-Phase PWM Rectifier control module further comprises outer voltage controlling unit and current inner loop controlling unit.The outer voltage controlling unit compares according to measured value and the DC bus-bar voltage set-point of DC bus-bar voltage, forms voltage close loop control, exports the given amplitude of three-phase input current, further obtains the set-point of three-phase input AC electric current.The current inner loop controlling unit compares by the measured value of three-phase input AC electric current and the set-point of three-phase input AC electric current, forms current closed-loop control, the switching device drive control signal of output Three-Phase PWM Rectifier 8.
As shown in Figure 11, the outer voltage controlling unit further comprises the first sampling filter unit 11, PI regulon 12, the second sampling filter unit 13, phase locked-loop unit 14 and multiplication unit 15.The first sampling filter unit 11 is gathered DC bus-bar voltage Udc and is exported PI regulon 12 to.After DC bus-bar voltage Udc and DC bus-bar voltage set-point Udc* compare in PI regulon 12 and regulate with PI, the given amplitude I of output three-phase input current.The instantaneous value of three-phase input voltage is gathered in the second sampling filter unit 13, obtains the three-phase standard sine wave identical with the AC-input voltage phase place through phase locked-loop unit 14.The given amplitude I of three-phase standard sine wave and three-phase input current multiplies each other in multiplication unit 15, obtains the set-point iN* of three-phase input AC electric current.
As shown in Figure 12, the current inner loop controlling unit further comprises the 3rd sampling filter unit 16, sample holding unit 17 and current hysteresis ring control unit 18.Three-phase input current signal iN is gathered in the 3rd sampling filter unit 16.The set-point iN* of three-phase input current signal iN and three-phase input current relatively obtains difference signal iN*-iN.Difference signal iN*-iN enters current hysteresis ring control unit 18 and obtains the PWM triggering signal, as the drive control signal of Three-Phase PWM Rectifier 8 switching devices through sample holding unit 17.
As shown in Figure 13, the motor test frequency-converting power supply also comprises H bridge inverter control module, and H bridge inverter control module comprises current controller 19, equalizing controller 20, space vector pulse width modulation unit 21 and equal subdivision 22.Given motor current signal im* and actual motor current signal im relatively produce voltage reference signal by overcurrent controller 19.Each H bridge inverter 10 output current obtains H bridge inverter 10 current average signals as current reference signal through after equal subdivision 22 averaged.Each H bridge inverter 10 output current is compared the back as the circulation signal with current reference signal, send into equalizing controller 20 and produce regulation voltage signal, regulation voltage signal and voltage reference signal are handled through space vector pulse width modulation unit 21 after relatively, as the control voltage of each H bridge inverter 10.
Shown in accompanying drawing 13 and accompanying drawing 14, shunt chopper output voltage controlling unit is formed in current controller 19 and space vector pulse width modulation unit 21, and shunt chopper output voltage controlling unit also further comprises the 4th sampling filter unit 23 and synchronous control unit 25.Motor 2 current signal im are gathered in the 4th sampling filter unit 23.The relatively back generation difference signal of motor 2 current signal im and given motor 2 current signal im* im*-im exports current controller 19 to and obtains voltage reference signal.The adjustment voltage signal that voltage reference signal produces through synchronous control unit 25 and equalizing controller 20 exports the drive control signal that space vector pulse width modulation unit 21 obtains H bridge inverter 10 each switching device to after relatively.
As shown in Figure 15, equalizing controller 20 and equal subdivision 22 are formed shunt chopper circulation controlling units, and shunt chopper circulation controlling unit also further comprises the 5th sampling filter unit 24.The output current of H bridge inverter 10 is gathered in the 5th sampling filter unit 24, through all obtaining the output current mean value of H bridge inverter 10 as current reference signal after subdivision 22 averaged.The output current signal of each H bridge inverter 10 and current reference signal obtain the circulation signal after relatively.The circulation signal exports equalizing controller 20 to and produces the adjustment voltage signal.
As shown in Figure 16, the specific embodiment of the invention provides a kind of method that above-mentioned motor test frequency-converting power supply is controlled.A kind of motor test frequency-converting power supply control method, the motor test frequency-converting power supply comprises: two four-quadrant cascade connection type frequency converters 1, motor 2 and contactor KM3;
Two four-quadrant cascade connection type frequency converters 1 drag 2 work of a motor respectively or drag the motor 2 that two rigid coaxial connect simultaneously and carry out mechanical back to back test;
When two four-quadrant cascade connection type frequency converter 1 independent operatings, contactor KM3 disconnects, and finishes motor 2 tests of different electric pressures respectively;
When two four-quadrant cascade connection type frequency converter 1 independent operatings, contactor KM3 disconnects, and when two motor 2 rigid coaxial connect, finishes motor 2 mechanical back to back test of different electric pressures;
When two four-quadrant cascade connection type frequency converter 1 parallel runnings, contactor KM3 closure is finished more motor 2 tests of high power capacity grade.
As a kind of typical execution mode of the present invention, when contactor KM3 disconnects, during two four-quadrant cascade connection type frequency converter 1 independent operatings, finish maximum 2500KVA capacity, different electric pressure motors 2 comprise no-load characteristic test, the folded correlation test of temperature rise test frequently; When described contactor KM3 disconnects, when two motor 2 rigid coaxial connect, carry out maximum 2500kVA capacity, different electric pressure motors 2 comprise dragging the correlation test of temperature rise test, load characteristic test; When two four-quadrant cascade connection type frequency converter 1 parallel runnings, contactor KM3 closure is finished maximum 5000KVA capacity, and different electric pressure motors 2 comprise no-load characteristic test, the folded correlation test of temperature rise test frequently.
Four-quadrant cascade connection type frequency converter 1 further comprises phase shifting transformer 3, high-voltage charging circuit 6, frequency-variable module 4 and contactor combination.The every of frequency-variable module 4 further comprises 2 mutually
nIndividual basic unsteady flow chain 5, n 〉=1, basic unsteady flow chain 5 comprises power cell 7 and equalizing reactor L.Change the series and parallel mode of each basic unsteady flow chain 5 by the on off state that changes the contactor combination, realize the maximum output that is respectively 3.45KV, 6.9KV, three electric pressure rated capacities of 13.8KV.
The outer voltage control procedure compares according to measured value and the DC bus-bar voltage set-point of DC bus-bar voltage, forms voltage close loop control, exports the given amplitude of three-phase input current, further obtains the set-point of three-phase input AC electric current;
The current inner loop control procedure compares by the measured value of three-phase input AC electric current and the set-point of three-phase input AC electric current, forms current closed-loop control, the drive control signal of output Three-Phase PWM Rectifier 8 switching devices.
As shown in Figure 17, the outer voltage control procedure further may further comprise the steps:
S101: gather DC bus-bar voltage Udc, and carry out filtering and handle;
S102: after the DC bus-bar voltage Udc that handles through filtering and DC bus-bar voltage set-point Udc* compare and regulate with PI, export the given amplitude I of three-phase input current;
S103: gather the instantaneous value of three-phase input voltage, obtain the three-phase standard sine wave identical with the AC-input voltage phase place through phase-locked processing;
S104: the given amplitude I of three-phase standard sine wave and three-phase input current multiplies each other, and obtains the set-point iN* of three-phase input AC electric current.
As shown in Figure 18, the current inner loop control procedure further may further comprise the steps:
S201: gather three-phase input current signal iN, and carry out filtering and handle;
S202: the set-point iN* of three-phase input current signal iN and three-phase input current compares and obtains difference signal iN*-iN;
S203: relatively the difference signal iN*-iN of gained keeps through over-sampling, carries out hysteresis current control again and obtains the PWM triggering signal, as the switching device drive control signal of Three-Phase PWM Rectifier 8.
Motor test frequency-converting power supply control method also further comprises H bridge inverter control procedure, and H bridge inverter control procedure further comprises shunt chopper output voltage control procedure and shunt chopper circulation control procedure.Given motor current signal im* and actual motor current signal im relatively produce voltage reference signal by overcurrent control.Each H bridge inverter 10 output current obtains H bridge inverter 10 current average signals as current reference signal through after the equal divisional processing averaged.Each H bridge inverter 10 output current is compared the back as the circulation signal with current reference signal, produce regulation voltage signal through sharing control, regulation voltage signal and voltage reference signal are handled through space vector pulse width modulation after relatively, as the control voltage of each H bridge inverter 10.
As shown in Figure 19, shunt chopper output voltage control procedure further may further comprise the steps:
S301: gather motor 2 current signal im, and carry out filtering and handle;
S302: after given motor 2 current signal im* and motor 2 current signal im are compared processing, produce difference signal im*-im and carry out Current Control and obtain voltage reference signal;
S303: voltage reference signal carries out space vector pulse width modulation through Synchronization Control and the adjustment voltage signal that produces through sharing control after relatively again to be handled, and obtains the drive control signal of H bridge inverter 10 each switching device.
As shown in Figure 20, shunt chopper circulation control procedure further may further comprise the steps:
S401: gather the output current of H bridge inverter 10, carry out that filtering is handled and averaged after, obtain the output current mean value of H bridge inverter 10 as current reference signal;
S402: the output current signal of each H bridge inverter 10 and current reference signal obtain the circulation signal after relatively;
S403: the circulation signal is carried out sharing control, produce and adjust voltage signal.
The applied motor test frequency-converting power supply of motor test frequency-converting power supply control method of the present invention is made up of two the four-quadrant cascade connection type frequency converters 1 that can realize the output of multi-voltage grade rated capacity.Two four-quadrant cascade connection type frequency converters 1 are can two-shipper in parallel to be driven or independently drives separately, also can drag 2 work of a motor respectively, also can drag the motor 2 that two rigid coaxial connect simultaneously and carry out mechanical back to back test.When independent operating, can carry out the delivery test of two motors 2 simultaneously, improved test efficiency.When parallel running, can maximum carry out the correlation test of separate unit power supply twice capacity electrical machinery 2, improved the test capability of system greatly.Wherein, separate unit four-quadrant cascade connection type frequency converter 1 is by the different on off states of contactor, form the different series and parallel combinations of a plurality of equal-wattages unit 7, realize the rated capacity output of multiple voltage grade, drive the motor 2 of different electric pressures, reduce equipment investment and occupation area of equipment, saved production cost.Separate unit four-quadrant cascade connection type frequency converter 1 adopts the topological structure of cascade connection type, and the mode of connecting with several low-voltage variable frequency power cells 7 realizes direct high pressure output, and output voltage waveforms is good, and harmonic content is low, need not to export filter.Can present the power cell 7 of type, not only realize the two-way flow of energy, and rectification pulse number height, net side power factor is close to 1, and harmonic content is few, and is low to electric network influencing.In addition, every basic unsteady flow chain 5 of frequency-variable module 4 all is connected with equalizing reactor L, can play series filtering, and the effect of parallel current-sharing can effectively suppress circulation, and supports relevant control algorithm.Not only can realize the multivoltage full capacity output of separate unit four-quadrant cascade connection type frequency converter, and can be easy to realize the parallel running of many four-quadrant cascade connection type frequency converters.The composing quantity N of four-quadrant cascade connection type frequency converter 1 can change according to the actual requirements among the present invention, and N is even number.As 10kV in the example, 5000kVA is made up of two cover 2500kVA four-quadrant cascade connection type frequency converters 1.Also can be changed into by quadruplet 1250kVA four-quadrant cascade connection type frequency converter 1 and form, wherein two cover 1250kVA four-quadrant cascade connection type frequency converters 1 are one group, and the every group two cover 2500kVA of realization in parallel four-quadrant cascade connection type frequency converter 1 exported, and realizes the function of above-mentioned example.It also can independently be exported by separate unit four-quadrant cascade connection type frequency converter 1 simultaneously, realizes the correlation test of 4 heap(ed) capacity 1250kVA motors 2 or the mechanical back to back test of 2 heap(ed) capacity 1250kVA motors 2 simultaneously.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the embodiment disclosed method, because it is corresponding with the disclosed device of embodiment, vice versa, so the corresponding description of relevant portion can get final product by cross-references.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet is not in order to limit the present invention.Any those of ordinary skill in the art, under the situation that does not break away from spiritual essence of the present invention and technical scheme, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (9)
1. a motor test frequency-converting power supply control method is characterized in that, described motor test frequency-converting power supply comprises: two four-quadrant cascade connection type frequency converters (1), motor (2) and contactor (KM3);
Described two four-quadrant cascade connection type frequency converters (1) drag a described motor (2) work respectively or drag the motor (2) that two rigid coaxial connect simultaneously and carry out mechanical back to back test;
When described two four-quadrant cascade connection type frequency converters (1) independent operating, described contactor (KM3) disconnects, and finishes motor (2) test of different electric pressures respectively;
When described two four-quadrant cascade connection type frequency converters (1) independent operating, described contactor (KM3) disconnects, and when described two motors (2) rigid coaxial connects, finishes motor (2) mechanical back to back test of different electric pressures;
When described two four-quadrant cascade connection type frequency converters (1) parallel running, described contactor (KM3) closure is finished the more motor of high power capacity grade (2) test.
2. a kind of motor test frequency-converting power supply control method according to claim 1 is characterized in that:
When described contactor (KM3) disconnects, during two four-quadrant cascade connection type frequency converters (1) independent operating, finish maximum 2500KVA capacity, different electric pressure motors (2) comprise no-load characteristic test, the folded correlation test of temperature rise test frequently;
When described contactor (KM3) disconnects, when two motors (2) rigid coaxial connects, carry out maximum 2500kVA capacity, different electric pressure motors (2) comprise dragging the correlation test of temperature rise test, load characteristic test;
When two four-quadrant cascade connection type frequency converters (1) parallel running, described contactor (KM3) closure is finished maximum 5000KVA capacity, and different electric pressure motors (2) comprise no-load characteristic test, the folded correlation test of temperature rise test frequently.
3. a kind of motor test frequency-converting power supply control method according to claim 1 and 2 is characterized in that: described four-quadrant cascade connection type frequency converter (1) further comprises phase shifting transformer (3), high-voltage charging circuit (6), frequency-variable module (4) and contactor combination; The every of described frequency-variable module (4) further comprises 2 mutually
nIndividual basic unsteady flow chain (5), n 〉=1, described basic unsteady flow chain (5) comprises power cell (7) and equalizing reactor (L); Change the series and parallel mode of each basic unsteady flow chain (5) by the on off state that changes each contactor in the contactor combination, realize the maximum output that is respectively 3.45KV, 6.9KV, three electric pressure rated capacities of 13.8KV.
4. a kind of motor test frequency-converting power supply control method according to claim 3, it is characterized in that: described power cell (7) further comprises Three-Phase PWM Rectifier (8), intermediate dc link (9) and H bridge inverter (10); Described motor test frequency-converting power supply control method further comprises the Three-Phase PWM Rectifier control procedure, and described Three-Phase PWM Rectifier control procedure comprises outer voltage control procedure and current inner loop control procedure;
The outer voltage control procedure compares according to measured value and the DC bus-bar voltage set-point of DC bus-bar voltage, forms voltage close loop control, exports the given amplitude of three-phase input current, further obtains the set-point of three-phase input AC electric current;
The current inner loop control procedure compares by the measured value of three-phase input AC electric current and the set-point of three-phase input AC electric current, forms current closed-loop control, the drive control signal of output Three-Phase PWM Rectifier (8) switching device.
5. a kind of motor test frequency-converting power supply control method according to claim 4 is characterized in that described outer voltage control procedure further may further comprise the steps:
S101: gather DC bus-bar voltage Udc, and carry out filtering and handle;
S102: after the DC bus-bar voltage Udc that handles through filtering and DC bus-bar voltage set-point Udc* compare and regulate with PI, export the given amplitude I of three-phase input current;
S103: gather the instantaneous value of three-phase input voltage, obtain the three-phase standard sine wave identical with the AC-input voltage phase place through phase-locked processing;
S104: the given amplitude I of described three-phase standard sine wave and described three-phase input current multiplies each other, and obtains the set-point iN* of three-phase input AC electric current.
6. a kind of motor test frequency-converting power supply control method according to claim 5 is characterized in that described current inner loop control procedure further may further comprise the steps:
S201: gather three-phase input current signal iN, and carry out filtering and handle;
S202: the set-point iN* of described three-phase input current signal iN and three-phase input current compares and obtains difference signal iN*-iN;
S203: relatively the difference signal iN*-iN of gained keeps through over-sampling, carries out hysteresis current control again and obtains the PWM triggering signal, as the switching device drive control signal of described Three-Phase PWM Rectifier (8).
7. according to the described a kind of motor test frequency-converting power supply control method of arbitrary claim among the claim 4-6, it is characterized in that: described motor test frequency-converting power supply control method also comprises H bridge inverter control procedure, and described H bridge inverter control procedure further comprises shunt chopper output voltage control procedure and shunt chopper circulation control procedure; Given motor current signal im* and actual motor current signal im relatively produce voltage reference signal by overcurrent control; Each H bridge inverter (10) output current obtains described H bridge inverter (10) current average signal as current reference signal through after the equal divisional processing averaged; Each H bridge inverter (10) output current is compared the back as the circulation signal with described current reference signal, produce regulation voltage signal through sharing control, described regulation voltage signal and described voltage reference signal are handled through space vector pulse width modulation after relatively, as the control voltage of each H bridge inverter (10).
8. a kind of motor test frequency-converting power supply control method according to claim 7 is characterized in that, described shunt chopper output voltage control procedure further may further comprise the steps:
S301: gather motor (2) current signal im, and carry out filtering and handle;
S302: after given motor (2) current signal im* and described motor (2) current signal im compared processing, produce difference signal im*-im and carry out Current Control and obtain voltage reference signal;
S303: described voltage reference signal carries out space vector pulse width modulation through Synchronization Control and the adjustment voltage signal that produces through sharing control after relatively again to be handled, and obtains the drive control signal of each switching device of described H bridge inverter (10).
9. a kind of motor test frequency-converting power supply control method according to claim 8 is characterized in that, described shunt chopper circulation control procedure further may further comprise the steps:
S401: gather the output current of described H bridge inverter (10), carry out that filtering is handled and averaged after, obtain the output current mean value of described H bridge inverter (10) as current reference signal;
S402: the output current signal of each H bridge inverter (10) and described current reference signal obtain the circulation signal after relatively;
S403: described circulation signal is carried out sharing control, produce and adjust voltage signal.
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|---|---|---|---|---|
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051764A (en) * | 2007-01-30 | 2007-10-10 | 广东志成冠军集团有限公司 | Parallel control device and method for sine wave inverter |
| US20110199033A1 (en) * | 2008-12-31 | 2011-08-18 | Mehdi Abolhassani | Partial Regeneration In A Multi-Level Power Inverter |
| CN102255545A (en) * | 2011-07-26 | 2011-11-23 | 湖南大学 | Two-phase inverted power system and comprehensive control method |
| CN102520354A (en) * | 2011-12-19 | 2012-06-27 | 湖南工业大学 | Asynchronous motor test system based on labview platform |
| CN202334318U (en) * | 2011-12-16 | 2012-07-11 | 南车株洲电机有限公司 | High-voltage motor testing power supply device |
| CN102749194A (en) * | 2012-07-26 | 2012-10-24 | 株洲中达特科电子科技有限公司 | Transmission testing system |
| CN103023345A (en) * | 2012-10-24 | 2013-04-03 | 株洲变流技术国家工程研究中心有限公司 | Multivoltage level output variable-frequency power source and control method thereof |
-
2013
- 2013-05-28 CN CN201310203683.6A patent/CN103280982B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051764A (en) * | 2007-01-30 | 2007-10-10 | 广东志成冠军集团有限公司 | Parallel control device and method for sine wave inverter |
| US20110199033A1 (en) * | 2008-12-31 | 2011-08-18 | Mehdi Abolhassani | Partial Regeneration In A Multi-Level Power Inverter |
| CN102255545A (en) * | 2011-07-26 | 2011-11-23 | 湖南大学 | Two-phase inverted power system and comprehensive control method |
| CN202334318U (en) * | 2011-12-16 | 2012-07-11 | 南车株洲电机有限公司 | High-voltage motor testing power supply device |
| CN102520354A (en) * | 2011-12-19 | 2012-06-27 | 湖南工业大学 | Asynchronous motor test system based on labview platform |
| CN102749194A (en) * | 2012-07-26 | 2012-10-24 | 株洲中达特科电子科技有限公司 | Transmission testing system |
| CN103023345A (en) * | 2012-10-24 | 2013-04-03 | 株洲变流技术国家工程研究中心有限公司 | Multivoltage level output variable-frequency power source and control method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 姬凯 等: "变频器在通用大容量电机试验系统的应用", 《高压变频器》 * |
| 康乐 等: "能量回馈式电机试验平台的系统研究", 《通信电源技术》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618334A (en) * | 2013-09-11 | 2014-03-05 | 合肥联信电源有限公司 | Electric energy recycling device used for generator and work method of electric energy recycling device |
| CN104377967A (en) * | 2014-12-12 | 2015-02-25 | 南车株洲电机有限公司 | Motor testing power supply method and device employing transformer and filter |
| CN107728061A (en) * | 2017-11-10 | 2018-02-23 | 中机国际工程设计研究院有限责任公司 | Electric transmission experimental rig and system |
| CN108333508A (en) * | 2017-12-22 | 2018-07-27 | 苏州恒美电子科技股份有限公司 | Power control system for electromechanical testing |
| CN108894965A (en) * | 2018-07-11 | 2018-11-27 | 广州智光电气技术有限公司 | Feed pump control system |
| CN110632367A (en) * | 2019-09-29 | 2019-12-31 | 广东美的暖通设备有限公司 | Detection method, detection device, frequency converter, frequency conversion system and storage medium |
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| CN111786571A (en) * | 2020-05-22 | 2020-10-16 | 中车株洲电力机车研究所有限公司 | Test power supply of rail transit equipment and control method thereof |
| CN111786571B (en) * | 2020-05-22 | 2024-04-19 | 中车株洲电力机车研究所有限公司 | Test power supply of rail transit equipment and control method thereof |
| CN114709842A (en) * | 2022-03-31 | 2022-07-05 | 西门子（上海）电气传动设备有限公司 | Grid-side voltage fluctuation suppression system, method, and storage medium |
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