CN106899241B - Brushless doubly-fed motor starting control device and method - Google Patents
Brushless doubly-fed motor starting control device and method Download PDFInfo
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- CN106899241B CN106899241B CN201710291501.3A CN201710291501A CN106899241B CN 106899241 B CN106899241 B CN 106899241B CN 201710291501 A CN201710291501 A CN 201710291501A CN 106899241 B CN106899241 B CN 106899241B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004804 winding Methods 0.000 claims abstract description 77
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000001276 controlling effect Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 8
- 230000005284 excitation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/005—Arrangements for controlling doubly fed motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a brushless doubly-fed motor starting control device which comprises a brushless doubly-fed motor, a three-phase full-control type power grid side converter, a three-phase full-control type motor side converter, a first alternating current power supply, a second alternating current power supply, a direct current conversion circuit, a change-over switch, a power winding control switch and a system control unit, wherein the three-phase full-control type power grid side converter, the three-phase full-control type motor side converter, the direct current conversion circuit, the change-over switch and the power winding control switch are respectively connected with the system control unit. The invention also provides a method step for starting control. The power winding is connected with the three-phase full-control motor side converter, the stator winding has small resistance, the output voltage of the direct-current conversion circuit is lower, the capacity of the direct-current conversion circuit can be smaller, the motor becomes a synchronous motor with the power winding and the control winding interchanged in the starting process, the problem of insufficient starting moment in the traditional synchronous starting is solved, and the high-performance starting of the brushless doubly-fed motor is realized.
Description
Technical Field
The invention relates to the field of motor speed regulation systems, in particular to a brushless double-fed motor starting control device and method.
Background
The brushless double-fed motor is a novel motor. The brushless doubly fed motor achieves a brushless structure through the power windings, the control windings and the specially designed rotor. The current brushless doubly-fed motor starting mode can be divided into synchronous starting and asynchronous starting, and the traditional synchronous starting is to simultaneously add an excitation source to two sets of stator windings of the brushless doubly-fed motor, which requires that the capacity of a current transformer is consistent with that of the brushless doubly-fed motor, and is contrary to the original purpose that the brushless doubly-fed motor can only use part of the capacity of the current transformer. To solve this problem, patent document (ZL 201511015056.5) discloses a method for realizing the current limiting function in the starting process of a brushless doubly-fed motor and achieving the effect of reducing the volume of the device by disconnecting all power devices of a control winding converter and connecting a brake resistor to a power control winding loop, wherein the method has the following defects: (1) When the motor is started for too long, the current limiting resistor heats seriously, and the reliable operation of the system is affected; (2) When the motor start load is large, a motor start failure condition occurs. Patent literature (ZL 201511015056.5) realizes starting of a motor by adjusting the amplitude and frequency of the output voltage of a motor-side converter on the basis of shorting a motor power winding. This method still cannot avoid the situation that the motor fails to start when the motor starts under a larger load.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a brushless doubly-fed motor starting control device and a starting control method thereof, in which a power winding is used for dc excitation, and a control winding is connected to a three-phase fully-controlled motor-side converter, so that the brushless doubly-fed motor can be equivalent to a synchronous motor with a power winding and a control winding interchanged during starting, thereby solving the problem of insufficient starting torque in the conventional synchronous starting method.
In order to achieve the purpose, the brushless doubly-fed motor starting control device comprises a brushless doubly-fed motor, a three-phase full-control type power grid side converter, a three-phase full-control type motor side converter, a first alternating current power supply and a second alternating current power supply, a direct current conversion circuit, a change-over switch, a power winding control switch and a system control unit, wherein the alternating current side of the three-phase full-control type power grid side converter is sequentially connected with the first alternating current power supply, the direct current side of the three-phase full-control type power grid side converter is connected with the direct current side of the three-phase full-control type motor side converter through a direct current bus, and the direct current bus is connected with a direct current bus capacitor in parallel; the input side of the direct current conversion circuit is connected with the direct current bus capacitor in parallel, and the output side of the direct current conversion circuit is connected with the power winding of the brushless doubly-fed motor through a change-over switch, wherein the second input end and the third input end of the change-over switch are in short circuit; the first alternating current power supply is connected with a power winding of the brushless doubly-fed motor through a power winding control switch; the three-phase full-control type power grid side converter, the three-phase full-control type motor side converter, the direct current conversion circuit, the change-over switch and the power winding control switch are respectively connected with the system control unit, the system control unit outputs a time sequence signal for controlling the power switch device in the three-phase full-control type motor side converter to be conducted, and a control sequence executed by the system control unit comprises:
step 1: the system control unit is initialized, and the change-over switch and the power winding control switch are disconnected;
step 2: starting a three-phase full-control type power grid side converter to enable the output voltage of the three-phase full-control type power grid side converter to reach a rated value;
step 3: after the change-over switch is closed, controlling the output voltage of the direct-current conversion circuit to enable the current of the power winding to gradually reach a preset value;
step 4: the system control unit sends out an instruction to control the on-off of each switching device in the three-phase full-control motor side converter, so that the rotating speed of the brushless doubly-fed motor is increased;
step 5: judging whether the rotating speed of the brushless doubly-fed motor is close to the rated rotating speed, if so, switching off a change-over switch, and executing the next step; if not, returning to the previous step;
step 6: adjusting the output current of the three-phase full-control motor side converter to enable the phase and the amplitude of the power winding end voltage to be respectively consistent with the phase and the amplitude of the first alternating current power supply;
step 7: closing a power winding control switch to finish the starting process, and controlling the switching state of each power switching device by a system control unit to enable the brushless doubly-fed motor to enter a normal running state.
The invention discloses a brushless doubly-fed motor starting control device, wherein a double-loop control algorithm based on an instantaneous power theory is adopted in the step 2, so that the output voltage of a power grid side converter reaches a rated value.
The system control unit detects the current of the control winding of the brushless doubly-fed motor, the phase and the amplitude of the end voltage of the power winding and the phase and the amplitude of the voltage of the second alternating current power supply in the step 4, adopts a space vector modulation algorithm, and controls the switching signals of the power switching devices in the three-phase fully-controlled motor side converter by gradually changing the amplitude and the frequency of the current reference vector of the control winding.
The invention relates to a brushless double-fed motor starting control device, wherein the first alternating current power supply and the second alternating current power supply are the same alternating current power supply.
The invention relates to a brushless double-fed motor starting control device, wherein a first alternating current power supply and a second alternating current power supply are different alternating current power supplies.
In order to achieve the above object, the present invention provides a brushless doubly-fed motor start control method, which is provided with a brushless doubly-fed motor, a three-phase fully-controlled grid-side converter, a three-phase fully-controlled motor-side converter, a direct current conversion circuit, a change-over switch, a power winding control switch and a system control unit, the method comprising the steps of:
step 1: the system control unit is initialized, and the change-over switch and the power winding control switch are disconnected;
step 2: starting a three-phase full-control power grid side converter to enable the output voltage of the power grid side converter to reach a rated value;
step 3: after the change-over switch is closed, controlling the output voltage of the direct-current conversion circuit to enable the current of the power winding to gradually reach a preset value;
step 4: the system control unit sends out an instruction to control the on-off of each power switch device in the three-phase full-control motor side converter, so that the rotating speed of the brushless doubly-fed motor is increased;
step 5: judging whether the rotating speed of the brushless doubly-fed motor is close to the rated rotating speed, if so, switching off a change-over switch, and executing the next step; if not, returning to the previous step;
step 6: adjusting the output current of the three-phase full-control motor side converter to enable the phase and the amplitude of the power winding end voltage to be respectively consistent with the phase and the amplitude of the second alternating current power supply;
step 7: closing the power winding control switch to finish the starting process, and controlling the switching state of each power switch by the system control unit to enable the brushless double-fed motor to enter a normal running state.
The invention discloses a brushless doubly-fed motor starting control method, wherein a double-loop control algorithm based on an instantaneous power theory is adopted in the step 2, so that the output voltage of a power grid side converter reaches a rated value.
The invention discloses a brushless doubly-fed motor starting control method, wherein a system control unit detects current of a brushless doubly-fed motor control winding in the step 4, phase and amplitude of end voltage of a power winding and phase and amplitude of voltage of a second alternating current power supply are controlled by adopting a space vector modulation algorithm, and switching signals of power switching devices in a three-phase fully-controlled motor side converter are controlled by gradually changing amplitude and frequency of a control winding current reference vector, so that the rotating speed of the brushless doubly-fed motor is gradually improved.
The invention relates to a brushless double-fed motor starting control method, wherein the first alternating-current power supply and the second alternating-current power supply are the same alternating-current power supply.
The invention relates to a brushless double-fed motor starting control method, wherein the first alternating current power supply and the second alternating current power supply are different alternating current power supplies.
The brushless doubly-fed motor starting control device and method have the advantages and positive effects that: by improving the control structure of the brushless doubly-fed motor, the power winding is connected with direct-current excitation, the control winding is connected with a three-phase fully-controlled motor side converter, the output voltage of a direct-current conversion circuit can be lower due to small resistance of a stator winding, the capacity of the direct-current conversion circuit can also be smaller, and the brushless doubly-fed motor is equivalently formed into a synchronous motor with the power winding and the control winding interchanged in the starting process, so that the problem of insufficient starting moment in the traditional synchronous starting method is solved, and the high-performance starting of the brushless doubly-fed motor is realized.
Drawings
FIG. 1 is a circuit block diagram of a brushless doubly-fed motor start control device of the present invention;
fig. 2 is a control flow chart of the brushless doubly-fed motor start control method of the invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, embodiments of the brushless doubly-fed motor start control device and method according to the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the brushless doubly-fed motor start control device of the present invention includes a brushless doubly-fed motor 7, a three-phase full-control type grid-side converter 3, a three-phase full-control type motor-side converter 4, first and second ac power supplies 1, 2, a dc conversion circuit 5, a change-over switch K1, a power winding control switch K2, and a system control unit 6. The alternating current side of the three-phase full-control type power grid side converter 3 is sequentially connected with the first alternating current power supply 1, the direct current side of the three-phase full-control type power grid side converter 3 is connected with the direct current side of the three-phase full-control type motor side converter 4 through a direct current bus, and a direct current bus capacitor C is connected in parallel on the direct current bus.
The input side of the direct current conversion circuit 5 is connected with the direct current bus capacitor C in parallel, and the output side of the direct current conversion circuit 5 is connected with the power winding of the brushless doubly-fed motor 7 through the change-over switch K1, wherein the second input end and the third input end of the change-over switch K1 are in short circuit; the second ac power source 2 is connected to the power winding of the brushless doubly-fed motor 7 via a power winding control switch K2.
The three-phase full-control type power grid side converter 3, the three-phase full-control type motor side converter 4, the direct current conversion circuit 5, the change-over switch K1 and the power winding control switch K2 are respectively connected with the system control unit 6. The system control unit 6 outputs a timing signal for controlling the turn-on of the power switching device in the three-phase fully-controlled motor-side inverter 4, and referring to fig. 2, a control sequence executed by the system control unit 6 includes:
step 1: the system control unit 6 is initialized, and the change-over switch K1 and the power winding control switch K2 are disconnected;
step 2: starting a three-phase full-control type power grid side converter 3, and enabling the output voltage of the three-phase full-control type power grid side converter 3 to reach a rated value by adopting a double-loop control algorithm based on an instantaneous power theory;
step 3: after the change-over switch K1 is closed, the output voltage of the direct-current conversion circuit 5 is controlled to enable the current of the power winding to gradually reach a preset value;
step 4: the system control unit sends out an instruction to control the on-off of each power switch device S7-S12 in the three-phase full-control motor side converter, so that the rotating speed of the brushless doubly-fed motor 7 is increased;
the specific method is that a system control unit 6 detects the current of a control winding of a brushless doubly-fed motor 7, the phase and amplitude of the voltage of a power winding end and the phase and amplitude of the voltage of a second alternating-current power supply 2, a space vector modulation algorithm is adopted, and the switching signals of power switching devices S7-S12 in a three-phase fully-controlled motor side converter 4 are controlled by gradually changing the amplitude and frequency of a control winding current reference vector, so that the rotating speed of the brushless doubly-fed motor is gradually improved.
Step 5: the system control unit 6 detects the rotating speed of the brushless doubly-fed motor 7 in real time through the encoder, judges whether the rotating speed of the brushless doubly-fed motor 7 is close to the rated rotating speed, if so, turns off the change-over switch K1, and executes the next step; if not, returning to the previous step;
step 6: the output current of the three-phase full-control motor side converter 4 is regulated, so that the phase and the amplitude of the power winding end voltage are respectively consistent with the phase and the amplitude of the second alternating current power supply 2;
step 7: the power winding control switch K2 is closed, the starting process is completed, the system control unit 6 controls the switching states of the power switching devices S1-S12, and the brushless doubly-fed motor 7 enters a normal running state.
The steps of the brushless doubly-fed motor start control method provided by the invention are consistent with the control sequence executed by the system control unit 6.
In the brushless doubly-fed motor start control device and method of the present invention, the first ac power source 1 and the second ac power source 2 may be the same ac power source or may be different ac power sources.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (10)
1. The utility model provides a brushless doubly-fed motor starts controlling means, includes brushless doubly-fed motor (7), three-phase full accuse electric wire netting side converter (3), three-phase full accuse motor side converter (4) and first, two alternating current power supply (1, 2), its characterized in that: the power winding control circuit further comprises a direct current conversion circuit (5), a change-over switch (K1), a power winding control switch (K2) and a system control unit (6), wherein:
the alternating current side of the three-phase full-control type power grid side converter (3) is sequentially connected with the first alternating current power supply (1) in a split mode, the direct current side of the three-phase full-control type power grid side converter (3) is connected with the direct current side of the three-phase full-control type motor side converter (4) through a direct current bus, and a direct current bus capacitor (C) is connected in parallel on the direct current bus;
the input side of the direct current conversion circuit (5) is connected with the direct current bus capacitor (C) in parallel, and the output side of the direct current conversion circuit (5) is connected with the power winding of the brushless doubly-fed motor (7) through the change-over switch (K1), wherein the second input end and the third input end of the change-over switch (K1) are in short circuit; the second alternating current power supply (2) is connected with a power winding of the brushless doubly-fed motor (7) through a power winding control switch (K2);
the three-phase full-control type power grid side converter (3), the three-phase full-control type motor side converter (4), the direct current conversion circuit (5), the change-over switch (K1) and the power winding control switch (K2) are respectively connected with the system control unit (6), the system control unit (6) outputs a time sequence signal for controlling the power switching device in the three-phase full-control type motor side converter (4) to be conducted, and a control sequence executed by the system control unit (6) comprises:
step 1: the system control unit (6) is initialized, and the change-over switch (K1) and the power winding control switch (K2) are disconnected;
step 2: starting a three-phase full-control type power grid side converter (3) to enable the output voltage of the three-phase full-control type power grid side converter (3) to reach a rated value;
step 3: after the change-over switch (K1) is closed, controlling the output voltage of the direct-current conversion circuit (5) to enable the current of the power winding to gradually reach a preset value;
step 4: the system control unit (6) sends out an instruction to control the on-off of each power switching device (S7-S12) in the three-phase full-control motor side converter (4) so as to increase the rotating speed of the brushless double-fed motor (7);
step 5: judging whether the rotating speed of the brushless doubly-fed motor (7) is close to the rated rotating speed, if so, switching off a change-over switch (K1) and executing the next step; if not, returning to the previous step;
step 6: the output current of the three-phase full-control motor side converter (4) is regulated, so that the phase and the amplitude of the power winding end voltage are respectively consistent with the phase and the amplitude of the second alternating current power supply (2);
step 7: closing a power winding control switch (K2), completing the starting process, and controlling the switching state of each power switching device (S1-S12) by a system control unit (6), wherein the brushless doubly-fed motor (7) enters a normal running state.
2. The brushless doubly fed motor starting control device as claimed in claim 1, wherein: and 2, adopting a double-loop control algorithm based on an instantaneous power theory to enable the output voltage of the three-phase full-control power grid side converter (3) to reach a rated value.
3. A brushless doubly fed motor starting control device as claimed in claim 1 or 2, wherein: the step 4 detects the current of a control winding of the brushless doubly-fed motor (7), the phase and the amplitude of the voltage of the power winding end and the phase and the amplitude of the voltage of the second alternating current power supply (2), a space vector modulation algorithm is adopted, and the switching signals of power switching devices (S7-S12) in the three-phase fully-controlled motor side converter (4) are controlled by gradually changing the amplitude and the frequency of a control winding current reference vector so as to regulate the output current of the three-phase fully-controlled motor side converter (4), so that the phase and the amplitude of the voltage of the power winding end are respectively consistent with the phase and the amplitude of the second alternating current power supply (2).
4. A brushless doubly fed motor starting control device as claimed in claim 3, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
5. A brushless doubly fed motor starting control device as claimed in claim 3, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are different alternating current power supplies.
6. A brushless double-fed motor starting control method is characterized in that: the method comprises the steps of arranging a brushless doubly-fed motor (7), a three-phase full-control type power grid side converter (3), a three-phase full-control type motor side converter (4), a direct current conversion circuit (5), a change-over switch (K1), a power winding control switch (K2), a first alternating current power supply (1), a second alternating current power supply (2) and a system control unit (6), wherein the alternating current side of the three-phase full-control type power grid side converter (3) is sequentially connected with the first alternating current power supply (1); the second alternating current power supply (2) is connected with a power winding of the brushless doubly-fed motor (7) through a power winding control switch (K2), and the method comprises the following steps:
step 1: the system control unit (6) is initialized, and the change-over switch (K1) and the power winding control switch (K2) are disconnected;
step 2: starting a three-phase full-control type power grid side converter (3) to enable the output voltage of the three-phase full-control type power grid side converter (3) to reach a rated value;
step 3: after the change-over switch (K1) is closed, controlling the output voltage of the direct-current conversion circuit (5) to enable the current of the power winding to gradually reach a preset value;
step 4: the system control unit (6) sends out an instruction to control the on-off of each power switching device (S7-S12) in the three-phase full-control motor side converter (4) so as to increase the rotating speed of the brushless double-fed motor (7);
step 5: judging whether the rotating speed of the brushless doubly-fed motor (7) is close to the rated rotating speed, if so, switching off a change-over switch (K1) and executing the next step; if not, returning to the previous step;
step 6: the output current of the three-phase full-control motor side converter (4) is regulated, so that the phase and the amplitude of the power winding end voltage are respectively consistent with the phase and the amplitude of the second alternating current power supply (2);
step 7: closing a power winding control switch (K2), completing the starting process, and controlling the switching state of each power switching device (S1-S12) by a system control unit (6), wherein the brushless doubly-fed motor (7) enters a normal running state.
7. The brushless doubly-fed motor starting control method as claimed in claim 6, wherein: and 2, adopting a double-loop control algorithm based on an instantaneous power theory to enable the output voltage of the three-phase full-control power grid side converter (3) to reach a rated value.
8. The brushless doubly fed motor starting control method according to claim 6 or 7, characterized in that: and step 6, detecting the current of a control winding of the brushless doubly-fed motor (7), and controlling the switching signals of each power switching device (S7-S12) in the three-phase fully-controlled motor side converter (4) by adopting a space vector modulation algorithm through gradually changing the amplitude and the frequency of a control winding current reference vector to regulate the output current of the three-phase fully-controlled motor side converter (4) so that the phase and the amplitude of the power winding end voltage are respectively consistent with the phase and the amplitude of the second alternating current power supply (2).
9. The brushless doubly-fed motor starting control method as claimed in claim 8, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
10. The brushless doubly-fed motor starting control method as claimed in claim 8, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are different alternating current power supplies.
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| CN201710291501.3A CN106899241B (en) | 2017-04-28 | 2017-04-28 | Brushless doubly-fed motor starting control device and method |
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| CN201710291501.3A CN106899241B (en) | 2017-04-28 | 2017-04-28 | Brushless doubly-fed motor starting control device and method |
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| CN111669000B (en) * | 2019-03-08 | 2021-09-21 | 美的威灵电机技术（上海）有限公司 | Control circuit of rotor, rotor assembly, motor and compressor |
| CN113236525B (en) * | 2021-06-11 | 2022-08-30 | 西安热工研究院有限公司 | Method for transforming steam-driven water-feeding pump into double-fed motor-driven water-feeding pump and starting method |
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| CN105471341A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting structure, asynchronous starting method and asynchronous starting device of brushless doubly-fed machine |
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| JP5378323B2 (en) * | 2010-08-09 | 2013-12-25 | 株式会社東芝 | Brushless motor drive circuit and brushless motor drive system |
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| CN105322840A (en) * | 2015-11-19 | 2016-02-10 | 广东上水能源科技有限公司 | Redundant type brushless double-fed motor speed regulating system capable of realizing flexible operation |
| CN105471341A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting structure, asynchronous starting method and asynchronous starting device of brushless doubly-fed machine |
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