CN203933491U - A kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems - Google Patents
A kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems Download PDFInfo
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- CN203933491U CN203933491U CN201320854719.2U CN201320854719U CN203933491U CN 203933491 U CN203933491 U CN 203933491U CN 201320854719 U CN201320854719 U CN 201320854719U CN 203933491 U CN203933491 U CN 203933491U
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Abstract
The utility model is a kind of drive system of wound-rotor motor rotor-side unit shunting in parallel of two quadrant operations.Especially the two frequency-converting control devices that regulate of rotor excitation that Wound-rotor type rotor side moved by unit two quadrants in parallel.This frequency-converting control device is to be connected in the leading-out end line of wound-rotor motor rotor, is directly powered by line voltage or other three-phase electricity.This frequency-changing control system comprises: rectification circuit, becomes direct current by the AC rectification of electrical network or other voltage sources; Inverter circuit, output PWM alternating current; Reactor circuit, level and smooth output waveform; PWM modulating unit, controls inverter circuit; Braking circuit, protects frequency-changing control system for motor stalling time.By applying one or more phase sequences, frequency, phase place to rotor winding, amplitude is all variable, and the three-phase voltage source being produced by frequency converter, forms the magnetic field of a rotation on rotor, change the frequency of rotating magnetic field, regulate rotor excitation, thereby change the rotating speed of rotor.The utlity model has the features such as efficiency is high, and speed change is easy, and capacity is little, low energy consumption, and near the load of idle hysteresis that can also be stator side compensation, realize dynamic compensation on the spot.
Description
Technical field
The utility model relates to the drive system of wound-rotor motor and control device composition, relate in particular to Wound-rotor type rotor side by the frequency-changing control system of unit two quadrant operations in parallel, rotor current is shunted, carry out the two excitation regulation of rotor, in the exportable torque of rotor-side, can carry out reactive power compensation to electrical network in stator side.
Background technology
At present, the speed regulating method great majority of Wound-rotor type and squirrel cage motor adopt stator side to be connected the control method of frequency converter, are called for short stator converter technique.Motor stator converter technique makes power frequency supply its frequency be changed exactly after converter plant, then to three-phase stator winding power supply, thereby reach the object that changes rotating speed.Stator converter plant directly bears line voltage, installed capacity be necessary for 1.1～1.2 times of motor rated capacities or more than.Unsteady flow power is large, and unit efficiency is up to 96% at full capacity, and when load declines, efficiency is lower.In the time bearing line voltage and be high pressure, a kind of feasible stator side frequency-changing control system structure is units in series partial-pressure structure, has huge multiplex phase shifting transformer in high voltage frequency converter, complex structure, reliability is lower, maintenance difficult, price is high, and the ratio of performance to price is relatively low.At rotor-side design cell two quadrant frequency-changing control systems in parallel, there is no ready-made control algolithm and control system, the parallel connection of rotor-side unit is without directly bearing line voltage, especially in the time that line voltage is high pressure, only needing provides the voltage corresponding to rotor turn ratio, and rotor unit parallel connection frequency conversion installed capacity is below 0.5 times of motor rated capacity.Therefore on same capacity motor, in the time that efficiency is identical, rotor-side unit parallel connection frequency conversion control system energy loss is less than connecting converter plant in stator side.Although stator side voltage is lower, the problem that rotor-side two quadrant frequency-changing control systems face is, rotor-side electric current and stator current also probably meet the relation of rotor turn ratio, be that rotor-side electric current is that stator side electric current is multiplied by rotor turn ratio, therefore rotor-side current ratio stator side is much larger, on powerful device, rotor-side power device requires withstand current excessive, is also a problem that will solve.The unit shunting scheme in parallel that the utility model application provides, by frequency-converting control device parallel connection, can address the above problem.
Electric load in electrical network, as motor, transformer etc., belongs to inductive load, and these electric equipment not only need to absorb active power to electric power system in running, go back absorbing reactive power simultaneously.Power factor is an important technical data of electric power system.Power factor is low, illustrates that circuit is large for the reactive power of alternating magnetic field conversion.With regard to power factor, stator side converter plant adds motor, shows as inductive load, can only accomplish close to 1.If load is very light, power factor can decline, and this is the feature of stator side frequency converter.Therefore conventional scheme is that shunt capacitor reactive-load compensation equipment is installed in electrical network, the reactive power that the inductive load that affords redress consumes, reduce the reactive power that electric network source side direction inductive load provides and carried by circuit, but this scheme needs huge and expensive parallel capacity reactive compensation equipment.And another selectable scheme is the scheme that present patent application provides, carry out the variable frequency control of two quadrants in rotor-side, adopt the excitation of virtual architecture regulating and controlling stator, rotor, as required, make to show as capacitive or inductive load in stator side, in rotor output torque acting, idle near local compensation.
Summary of the invention
The purpose of this utility model is to provide a kind of method and adds with solution and winding motor associated the problems referred to above of drive system that parallel control device forms for the equipment of implementing the method.The purpose of this utility model is to realize as the method and apparatus of feature by the content to be stated in independent claims.Be disclosed in the dependent claims preferred embodiment of the present utility model.
The utility model is based on following design: connect topology according to many cover three phase windings of wound-rotor motor rotor, rotor three-phase winding current is drawn out to outside motor through electric current ejector, be connected to two quadrant frequency-converting control device in parallel.Two quadrant frequency-converting control device in parallel has identical circuit topology and control algolithm.According to the size of rotor current, the number that changeable rotor three-phase winding is drawn, and correspondingly increase and decrease the number of shunting means.When the plant capacity of driven by motor is larger, rotor-side electric current, because the relation of turn ratio there will be larger electric current, now needs to increase rotor side and overlaps the number of three-phase winding leading-out wire more, and increases control device in parallel.When the plant capacity of driven by motor hour, in the situation that rotor-side electric current can tolerate, can reduce rotor side and overlap the number of three-phase winding leading-out wire more, and reduce control device in parallel.The frequency-converting control device of each parallel connection adopts virtual architecture control, by regulating stator and rotor-exciting, and two quadrant variable frequency regulating speed control, stator side and rotor-side be not all to electrical network feed.
The frequency-converting control device of each parallel connection is respectively to rotor current separately, stator voltage, current amplitude and phase place adopt ring closed-loop control in the two excitation regulation of virtual architecture rotor, and ask the poor two excitation regulation outer shroud closed-loop controls of virtual architecture rotor of carrying out with the rotor speed that given rotating speed and detection are returned, revise the voltage that is applied to rotor-side.Amplitude and phase place are by the electric current of the electric current of detection rotor side, stator side, voltage, electric current, voltage are carried out to 3/2 conversion tries to achieve, and rotating speed obtains by speed detector.Then in control system, will detect the speed discrepancy, amplitude, phase signal of returning as using with reference to signal.
The advantage of the utility model and equipment is: bear voltage low, unsteady flow power is little, power saving more, and in drive system, inverter whole volume is only below 50% of motor rated capacity.Each frequency-converting control device main circuit structure in parallel is simple, and due to the method for attachment difference of rotor winding, the capacity of single assembly is also different.If winding in parallel formation that be identical unit, so the capacity of single assembly be inverter population size divided by control device number, therefore capacity is lower, reliability is higher.In the time that single frequency-converting control device breaks down, failed equipment can be cut away from drive system, other parallel control devices and corresponding motor rotor winding are normally worked, and still can provide suitable torque, thereby fault-tolerance are higher, and drive system fail safe is higher.Control system modularized design, can flexible expansion, in the situation that rotor-side electric current can bear, can be reduced to individual unit.Because rotor side voltage will be significantly less than stator side voltage, use common power electronic device to be competent at, thereby make this drive system cost be significantly less than the drive system of stator side frequency conversion.
The utility model additional advantage is: motor speed adjustable extent broadens, from zero-speed to the synchronous speed to asynchronous machine, and then adjustable continuously to electrical network power frequency rotating speed.
The advantage that the utility model also has is: in rotor-side output torque, near the load of idle hysteresis stator side compensation, realizes dynamic compensation on the spot.
Brief description of the drawings
Fig. 1 has provided the drive system overall structure according to embodiment of the present utility model.
Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d), Fig. 2 (e) and Fig. 2 (f) have provided the rotor winding different topology figure according to embodiment of the present utility model.
Fig. 3 has provided the control system that comprises 4 closed-loop controls according to embodiment of the present utility model.
Specific implementation method
1. Fig. 1 has provided according to the integrally-built example of the drive system of embodiment of the present utility model.Stator winding connecting stator power supply A in electric motor units 1 in Fig. 1, B, C.Rotor winding 2 can be single cover or overlaps three phase windings, three phase winding A in rotor winding 2 more
1, B
1, C
1by electric current draw unit 3 (can for slip ring and brush or other can extracted current device) rotor current drawn be connected to frequency-converting control device 5, frequency-converting control device 5 is connected to rotor power supply U, V, W; Three phase winding A
2, B
2, C
2draw unit 4 by electric current rotor current is drawn and is connected to frequency-converting control device 6, frequency-converting control device 6 is connected to rotor power supply U, V, W, by that analogy, can also add more multi-parallel control device.
2. in Fig. 1, the topology of three phase windings in rotor winding 2 is Y-connection, connects but also can be triangle, and Fig. 2 has provided several different topological structures of three cover three-phase rotor windings for example.
3. in Fig. 1, frequency-converting control device 5 and frequency-converting control device 6 are the frequency-converting control device with same structure and control algolithm in parallel, and detailed structure is shown in Fig. 3.
4. Fig. 2 (a) has provided three cover three-phase rotor winding star series connection outlet structures, Fig. 2 (b) provided three cover three-phase rotor windings wherein two cover stars series connection add a set of star outlet structure, Fig. 2 (c) has provided three cover three-phase rotor winding star outlet structures, Fig. 2 (d) has provided three cover three-phase rotor windings in series triangle outlet structures, Fig. 2 (e) provided three cover three-phase rotor windings wherein two cover serial triangle add a set of triangle outlet structure, Fig. 2 (f) has provided three cover three-phase rotor winding triangle outlet structures.The tricks of rotor winding is not limited only to the cover of three shown in Fig. 2 three-phase rotor winding with topological connection, but can change along with the number of variations of rotor winding; Also be not limited only to listed topological structure in Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d), Fig. 2 (e) and Fig. 2 (f), but can be their combination.
5. Fig. 3 has provided according to the example of the frequency-converting control device 5 of embodiment of the present utility model.The two excitation regulation virtual architecture controllers 20 of rotor in Fig. 3 are based on rotor speed, rotor current vector, stator current vector, 4 closed-loop controls of stator voltage vector.
6. in Fig. 3, the stator side of wound-rotor motor 1 be connected to there is A phase, the three phase supply network of B phase, C phase.In addition, rectification circuit 7 is connected to U phase, V phase, W phase supply network and is connected to rotor-side inverter circuit 9.Rotor-side inverter circuit 9 can be connected to outlet reactor 10, again by outlet reactor 10 be connected to there is a phase, the rotor-side of the wound-rotor motor 1 of b phase, c phase, or rotor-side inverter circuit 9 can be connected directly to there is a phase, the rotor-side of the wound-rotor motor 1 of b phase, c phase.Fig. 1 gives for braking circuit 8.
7. in Fig. 3, the stator current i that stator voltage, current detecting and three or two converter units 16 are measured
sA, i
sBwith voltage V
sA, V
sB, through calculating i
sC, V
sC, these are worth through 3/2 conversion, obtain the i under corresponding two phase coordinate systems
s α, i
s βand V
s α, V
s β, then pass through amplitude phase angle resolving cell 18 and 19, draw stator current phase angle theta
sIwith amplitude A
sIwith stator voltage phase angle theta
sUwith amplitude A
sU, then these values are fed to the two excitation regulation virtual architecture controllers 20 of rotor.
8. in Fig. 3, rotor current detects and three or two converter units 14 are measured rotor current i
rA, i
rB, draw i
rC, these are worth through 3/2 conversion, draw the i under corresponding two phase coordinate systems
r α, i
r β, then pass through amplitude phase angle resolving cell 17, draw rotor current phase angle theta
riwith amplitude A
ri, then these values are fed to the two excitation regulation virtual architecture controllers 20 of rotor.
9. in Fig. 3, rotor speed detecting unit 15 is measured rotor speed ω
r, calculate rotor frequency f
r, then with set-point frequency f
refbe the poor △ f that draws, difference is fed to the two excitation regulation virtual architecture controllers 20 of rotor.
10. in Fig. 3, the two excitation regulation virtual architecture controllers 20 of rotor, according to being fed to the parameters coming, calculate stator power-factor angle φ
s, and rotor power-factor angle φ
r, provide the voltage parameter V of PWM modulating unit 13 in conjunction with the poor △ f of rotor speed and given rotating speed
r αand V
r β.
11. in Fig. 3, and busbar voltage detecting unit 11 detects DC bus-bar voltage U
dC_PN, with given direct voltage U
dC_refcompare, when difference is greater than certain numerical value, brak control unit 12 can send signal S
0, drive braking circuit 8, by conductive discharge, protection DC circuit voltage stabilization.
12. in Fig. 3, and PWM modulating unit 13 is according to the voltage parameter V exporting from the two excitation regulation virtual architecture controllers 20 of rotor
r αand V
r βmodulate, to rotor-side inverter circuit 9 output drive signal S
1.Can adopt multiple carrier wave without dead band SPWM modulation and based on transition on off state without dead band SVPWM modulation, deadband eliminating effect, improves busbar voltage utilance.
Parallel connection by inside, unit between 13. each frequency-converting control devices is coordinated to carry out data communication between control unit 23 and other frequency-converting control devices, makes each frequency-converting control device can both be normally and the work of coordination.
14. in Fig. 3, can also use other signals, instead of only limits to use stator voltage, stator current, rotor current, rotor speed, controls rotor-side inverter circuit 9.
More than 15. be that 4 closed-loop control systems based on parallel connection and corresponding wound-rotor motor have been described the utility model in conjunction with Fig. 1, Fig. 2, Fig. 3.But the wound-rotor motor rotor winding in the utility model is not limited to several situations that Fig. 1, Fig. 2 list, and can adopt more three phase windings, adopts similar method to draw rotor current.In like manner, unit in parallel is also not limited to the situation that Fig. 1 lists, but the three-phase current number that can draw according to rotor winding unit in parallel more or reduce number of unit in parallel, and according to the rotor current of drawing vary in size can different capacity in parallel major-minor unit.In like manner, control device is not limited to this 4 closed loop that Fig. 3 lists.Can use several arbitrarily in 4 signals, or be greater than 4 signals as value of feedback.In different control system, construct drive system with the similar method of method of using in conjunction with Fig. 1, Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d), Fig. 2 (e) and Fig. 2 (f), Fig. 3.
16. for a person skilled in the art, obviously, can realize basic conception of the present utility model in a lot of different modes, and therefore, the utility model and embodiment are not limited to example described above, but can in the scope of claim, change.
Claims (10)
1. a quadrant operation winding motor rotor-side unit shunting in parallel drive system, the frequency-converting control device that is connected two quadrant operations of rotor-side parallel connection by wound-rotor motor forms drive system, drive system has comprised the wound-rotor motor rotor winding outer lead and electric current ejector and the frequency-converting control device in parallel that adapt with parallel-connection structure, frequency-converting control device is by rotor control winding motor, utilize rotor current, rotor speed, stator voltage and stator current are as feedback variable, carry out the two adjustings of rotor excitation, described drive system is characterized as and on the lead-out wire of winding motor rotor, is parallel with the frequency-converting control device by two quadrants operations of electrical network or other ac power supplies, motor stator side connects electrical network, directly powered by electrical network.
2. a kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as claimed in claim 1, is characterized in that the wound-rotor motor rotor winding in drive system has the winding topology and the electric current ejector that adapt with parallel-connection structure.
3. a kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as claimed in claim 1, is characterized in that the frequency-converting control device in drive system has flow dividing structure in parallel.
4. a kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as claimed in claim 1, it is characterized in that frequency-changing control system is voltage-type frequency-variable controller, described control system is based on rotor current, rotor speed, stator current, stator voltage, can be used 4,3,2 or 1 in 4 parameters, by closed-loop control, carry out the two adjustings of rotor excitation, described frequency-changing control system, can be by ac-dc-ac inverter control, also can have straight-friendship variable frequency control.
5. the one two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as described in claim 1 or 3, the electric power system that it is characterized in that frequency-converting control device is alternating-current voltage source.
6. the one two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as described in claim 1 or 2 or 4, it is characterized in that the motor that frequency-converting control device connects is wire wound asynchronous motor, described frequency-converting control device can be realized the asynchronous of motor, synchronous operation.
7. one as claimed in claim 1 or 2 or 3 or 4 two quadrants operation winding motor rotor-side unit shunting in parallel drive systems, is characterized in that field frequency and rotor frequency that rotor current forms are inversely prroportional relationships, they be stator field frequency.
8. the one two quadrant operation winding motor rotor-side unit shunting in parallel drive systems as described in claim 1 or 4, is characterized in that frequency-converting control device is by rectification circuit, inverter circuit, outlet reactor, braking circuit, inverse control system composition; Inverter circuit comprises two level, three level and even multi-level circuit, and described inverter circuit drives signal to adopt PWM modulator approach to generate.
9. drive systems are shunted in the one two quadrant operation winding motor rotor-side unit parallel connections as described in claim 1 or 4, it is characterized in that the phase sequence of inverter circuit output voltage, frequency, and phase place, amplitude is all adjustable.
10. one as claimed in claim 1 or 2 or 3 or 4 two quadrants operation winding motor rotor-side unit shunting in parallel drive systems, it is characterized in that frequency-changing control system compares with respect to stator side frequency converter, the population size of described frequency-changing control system is below 50% of described winding motor rated capacity, and the output voltage of described frequency-changing control system is described below 50% of winding motor rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320854719.2U CN203933491U (en) | 2013-12-21 | 2013-12-21 | A kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320854719.2U CN203933491U (en) | 2013-12-21 | 2013-12-21 | A kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems |
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| Publication Number | Publication Date |
|---|---|
| CN203933491U true CN203933491U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320854719.2U Expired - Fee Related CN203933491U (en) | 2013-12-21 | 2013-12-21 | A kind of two quadrant operation winding motor rotor-side unit shunting in parallel drive systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684199A (en) * | 2013-12-21 | 2014-03-26 | 宋崇辉 | Drive system for unit parallel shunting at side of wound rotor motor operating in two quadrants |
| CN108092582A (en) * | 2017-10-13 | 2018-05-29 | 北京东标电子有限公司 | A kind of powerful synchronous machine frequency conversion speed-adjusting system for mm finishing mill unit |
-
2013
- 2013-12-21 CN CN201320854719.2U patent/CN203933491U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684199A (en) * | 2013-12-21 | 2014-03-26 | 宋崇辉 | Drive system for unit parallel shunting at side of wound rotor motor operating in two quadrants |
| CN108092582A (en) * | 2017-10-13 | 2018-05-29 | 北京东标电子有限公司 | A kind of powerful synchronous machine frequency conversion speed-adjusting system for mm finishing mill unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20161221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |