CN106992723B - Brushless double-fed motor starting control device and method capable of realizing multi-mode operation - Google Patents
Brushless double-fed motor starting control device and method capable of realizing multi-mode operation Download PDFInfo
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- CN106992723B CN106992723B CN201710291494.7A CN201710291494A CN106992723B CN 106992723 B CN106992723 B CN 106992723B CN 201710291494 A CN201710291494 A CN 201710291494A CN 106992723 B CN106992723 B CN 106992723B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 74
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
Abstract
The invention provides a brushless doubly-fed motor starting control device capable of realizing multi-mode operation, 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 control 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 control 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 brushless double-fed motor starting control device and method capable of realizing multi-mode operation have the advantages and positive effects that: the brushless double-fed motor can still continuously run when the power winding power supply is abnormal, and the running reliability of the brushless double-fed motor is further improved.
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 capable of realizing multi-mode operation.
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. Currently, brushless doubly-fed motors have only two modes of operation, super-synchronous and sub-synchronous. In both modes of operation, the power winding must be connected to a stable and reliable high voltage power supply. Once the high voltage power supply is abnormal, the brushless doubly fed motor cannot work. The existing control scheme can not ensure that the motor can still continuously run when the power winding power supply is abnormal.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a brushless doubly-fed motor start control device and a start control method thereof capable of implementing multi-mode operation, which can solve the problem that the brushless doubly-fed motor can still continuously operate when the power winding power supply is abnormal, and further improve the reliability of the operation of the brushless doubly-fed motor.
In order to achieve the above purpose, the invention provides a brushless doubly-fed motor starting control device capable of realizing multi-mode operation, 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 control 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 connected with the first alternating current power supply in sequence, 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, a direct current bus capacitor is connected in parallel on the direct current bus, the second alternating current power supply is connected with a power winding of the brushless doubly-fed motor through a power winding control switch, and the power winding of the brushless doubly-fed motor is in short circuit with each other through the control switch; the system control unit realizes various operation modes through the mutual combination of the three-phase full-control type power grid side converter, the three-phase full-control type motor side converter, the control switch and the power winding control switch, and a control sequence executed by the system control unit comprises:
step 1: the system control unit is initialized, the control switch and the power winding control switch are disconnected, and the power grid-side converter is put into operation, so that the voltage at two ends of the capacitor reaches a set value;
step 2: according to the load condition and the actual running requirement, an asynchronous variable frequency speed regulation mode or a sub-synchronous speed regulation mode or an over-synchronous speed regulation mode is selected, if the asynchronous variable frequency speed regulation mode is selected, the step 3 is executed, if the sub-synchronous speed regulation mode is selected, the step 4 is executed, and if the over-synchronous speed regulation mode is selected, the step 7 is executed;
step 3: closing the control switch and opening the power winding control switch, regulating the rotating speed of the brushless doubly-fed motor by changing the amplitude and the frequency of the output voltage of the three-phase fully-controlled motor side converter, and repeatedly executing the steps;
step 4: closing the control switch, opening the power winding control switch and switching to the step 5;
step 5: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch, regulating the amplitude and the phase of the motor power winding terminal voltage through a motor side converter, and switching to the step 6; if not, repeating the step;
step 6: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply, if so, closing a power winding control switch, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at the two ends of the capacitor constant; if not, returning to the step 6;
step 7: closing the control switch, opening the power winding control switch and switching to the step 8;
step 8: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch, adjusting the amplitude and the phase of the output voltage of the variable three-phase full-control motor side converter, and switching to the step 9; if not, repeating the step;
step 9: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply, if so, closing a power winding control switch, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at the two ends of the capacitor constant; if not, return to step 9.
The invention can realize the brushless double-fed motor starting control device with multi-mode operation, wherein the first alternating current power supply and the second alternating current power supply are the same alternating current power supply.
The invention can realize the brushless double-fed motor starting control device with multi-mode operation, wherein the first alternating current power supply and the 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 control 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, the control switch and the power winding control switch are disconnected, and the power grid-side converter is put into operation, so that the voltage at two ends of the capacitor reaches a set value;
step 2: according to the load condition and the actual running requirement, an asynchronous variable frequency speed regulation mode or a sub-synchronous speed regulation mode or an over-synchronous speed regulation mode is selected, if the asynchronous variable frequency speed regulation mode is selected, the step 3 is executed, if the sub-synchronous speed regulation mode is selected, the step 4 is executed, and if the over-synchronous speed regulation mode is selected, the step 7 is executed;
step 3: closing the control switch and opening the power winding control switch, regulating the rotating speed of the brushless doubly-fed motor by changing the amplitude and the frequency of the output voltage of the three-phase fully-controlled motor side converter, and repeatedly executing the steps;
step 4: closing the control switch, opening the power winding control switch and switching to the step 5;
step 5: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch, regulating the amplitude and the phase of the motor power winding terminal voltage through a motor side converter, and switching to the step 6; if not, repeating the step;
step 6: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply, if so, closing a power winding control switch, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at the two ends of the capacitor C constant; if not, returning to the step 6;
step 7: closing the control switch, opening the power winding control switch and switching to the step 8;
step 8: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch, adjusting the amplitude and the phase of the output voltage of the variable three-phase full-control motor side converter, and switching to the step 9; if not, repeating the step;
step 9: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply, if so, closing a power winding control switch, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at the two ends of the capacitor constant; if not, return to step 9.
The invention can realize the brushless double-fed motor starting control method of multi-mode operation, wherein the first alternating current power supply and the second alternating current power supply are the same alternating current power supply.
The invention can realize the brushless double-fed motor starting control method of multi-mode operation, wherein the first alternating current power supply and the second alternating current power supply are different alternating current power supplies.
The brushless double-fed motor starting control device and method capable of realizing multi-mode operation have the advantages and positive effects that: the brushless double-fed motor can still continuously run when the power winding power supply is abnormal, and the running reliability of the brushless double-fed motor is further improved.
Drawings
FIG. 1 is a circuit block diagram of a brushless doubly-fed motor start control device embodying multi-mode operation of the present invention;
fig. 2 is a control flow diagram of a brushless doubly-fed motor start control method embodying multi-mode operation of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, embodiments of a brushless doubly-fed motor start control device and method for implementing multi-mode operation according to the present invention will be described in further detail 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 starting control device capable of realizing multi-mode operation according to the present invention comprises a brushless doubly-fed motor 7, a three-phase fully-controlled grid-side converter 3, a three-phase fully-controlled motor-side converter 4, first and second ac power sources 1 and 2, a control 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 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 power winding of the brushless doubly-fed motor is short-circuited among windings through the control switch K1. The three-phase full-control type power grid side converter 3, the three-phase full-control type motor side converter 4, the control switch K1 and the power winding control switch K2 are controlled by the system control unit 6.
The system control unit 6 realizes multiple operation modes through the mutual combination of the three-phase full-control type power grid side converter 3, the three-phase full-control type motor side converter 4, the control switch K1 and the power winding control switch K2, and a control sequence executed by the system control unit 6 comprises:
step 1: the system control unit is initialized, the control switch K1 and the power winding control switch K2 are disconnected, and the power grid side converter is put into operation, so that the voltage at two ends of the capacitor C reaches a set value;
step 2: according to the load condition and the actual running requirement, an asynchronous variable frequency speed regulation mode or a sub-synchronous speed regulation mode or an over-synchronous speed regulation mode is selected, if the asynchronous variable frequency speed regulation mode is selected, the step 3 is executed, if the sub-synchronous speed regulation mode is selected, the step 4 is executed, and if the over-synchronous speed regulation mode is selected, the step 7 is executed;
step 3: closing a control switch K1 and opening a power winding control switch K2, regulating the rotating speed of the brushless doubly-fed motor by changing the amplitude and the frequency of the output voltage of the three-phase fully-controlled motor side converter, and repeatedly executing the steps;
step 4: closing the control switch K1 and opening the power winding control switch K2, and switching to the step 5;
step 5: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch K1, regulating the amplitude and the phase of the motor power winding end voltage through a motor side converter, and switching to the step 6; if not, repeating the step;
step 6: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply 2, if so, closing a power winding control switch K2, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed by controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at two ends of a capacitor C constant; if not, returning to the step 6;
step 7: closing the control switch K1 and opening the power winding control switch K2, and switching to the step 8;
step 8: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch K1, adjusting the amplitude and the phase of the output voltage of the variable three-phase full-control motor side converter, and switching to the step 9; if not, repeating the step;
step 9: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply 2, if so, closing a power winding control switch K2, enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed by controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at two ends of a capacitor C constant; if not, return to step 9.
The steps of the brushless doubly-fed motor starting control method capable of realizing multi-mode operation provided by the invention are consistent with the control sequence executed by the system control unit 6.
In the brushless doubly-fed motor starting control device and method capable of realizing multi-mode operation, the first alternating-current power supply 1 and the second alternating-current power supply 2 can be the same alternating-current power supply or different alternating-current power supplies.
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 (6)
1. The utility model provides a brushless doubly-fed motor start control device that can realize multimode operation, 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: further comprising a control 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), 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, a direct current bus capacitor C is connected in parallel on the direct current bus, 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 power winding of the brushless doubly-fed motor is in short circuit through the control switch (K1); the three-phase full-control type power grid side converter (3), the three-phase full-control type motor side converter (4), the control switch (K1) and the power winding control switch (K2) are controlled by the system control unit (6), the system control unit realizes multiple operation modes through the mutual combination of the three-phase full-control type power grid side converter (3), the three-phase full-control type motor side converter (4), the control switch (K1) and the power winding control switch (K2), and a control sequence executed by the system control unit (6) comprises:
step 1: the system control unit is initialized, a control switch (K1) and a power winding control switch (K2) are disconnected, and the power grid-side converter is put into operation, so that the voltage at two ends of a capacitor C reaches a set value;
step 2: according to the load condition and the actual running requirement, an asynchronous variable frequency speed regulation mode or a sub-synchronous speed regulation mode or an over-synchronous speed regulation mode is selected, if the asynchronous variable frequency speed regulation mode is selected, the step 3 is executed, if the sub-synchronous speed regulation mode is selected, the step 4 is executed, and if the over-synchronous speed regulation mode is selected, the step 7 is executed;
step 3: closing a control switch (K1) and opening a power winding control switch (K2), regulating the rotating speed of the brushless doubly-fed motor by changing the amplitude and the frequency of the output voltage of the three-phase fully-controlled motor side converter, and repeatedly executing the steps;
step 4: closing the control switch (K1) and opening the power winding control switch (K2), and switching to the step 5;
step 5: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch (K1), regulating the amplitude and the phase of the motor power winding terminal voltage through a motor side converter, and switching to the step 6; if not, repeating the step;
step 6: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply (2), if so, closing a power winding control switch (K2), enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at two ends of the capacitor C constant; if not, returning to the step 6;
step 7: closing the control switch (K1) and opening the power winding control switch (K2), and switching to the step 8;
step 8: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch (K1), adjusting the amplitude and the phase of the output voltage of the variable three-phase full-control motor side converter, and switching to the step 9; if not, repeating the step;
step 9: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the second alternating current power supply (2), if so, closing a power winding control switch (K2), enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the side converter, enabling the network side converter to work in an inversion state, and keeping the voltage at two ends of the capacitor C constant; if not, return to step 9.
2. The brushless doubly-fed motor starting control device capable of multi-mode operation according to claim 1, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
3. The brushless doubly-fed motor starting control device capable of multi-mode operation according to claim 1, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are different alternating current power supplies.
4. A brushless doubly-fed motor start control method capable of realizing multi-mode operation, applied to the brushless doubly-fed motor start control device capable of realizing multi-mode operation as claimed in any one of claims 1 to 3, characterized in that the method is provided with a brushless doubly-fed motor (7), a three-phase fully-controlled grid-side converter (3), a three-phase fully-controlled motor-side converter (4), a control switch (K1), a power winding control switch (K2) and a system control unit (6), the method comprising the steps of:
step 1: the system control unit is initialized, a control switch (K1) and a power winding control switch (K2) are disconnected, and the power grid-side converter is put into operation, so that the voltage at two ends of a capacitor C reaches a set value;
step 2: according to the load condition and the actual running requirement, an asynchronous variable frequency speed regulation mode or a sub-synchronous speed regulation mode or an over-synchronous speed regulation mode is selected, if the asynchronous variable frequency speed regulation mode is selected, the step 3 is executed, if the sub-synchronous speed regulation mode is selected, the step 4 is executed, and if the over-synchronous speed regulation mode is selected, the step 7 is executed;
step 3: closing a control switch (K1) and opening a power winding control switch (K2), regulating the rotating speed of the brushless doubly-fed motor by changing the amplitude and the frequency of the output voltage of the three-phase fully-controlled motor side converter, and repeatedly executing the steps;
step 4: closing the control switch (K1) and opening the power winding control switch (K2), and switching to the step 5;
step 5: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch (K1), regulating the amplitude and the phase of the motor power winding terminal voltage through a motor side converter, and switching to the step 6; if not, repeating the step;
step 6: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the power supply of the second alternating-current power supply (2), if so, closing a power winding control switch (K2), enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the converter at the side of the motor, enabling the converter at the side of the net to work in an inversion state, and keeping the voltage at the two ends of the capacitor C constant; if not, returning to the step 6;
step 7: closing the control switch (K1) and opening the power winding control switch (K2), and switching to the step 8;
step 8: judging whether the motor rotation speed reaches a preset rotation speed, if so, switching off a control switch (K1), adjusting the amplitude and the phase of the output voltage of the variable three-phase full-control motor side converter, and switching to the step 9; if not, repeating the step;
step 9: judging whether the amplitude and the phase of the voltage at the power winding end of the brushless doubly-fed motor are respectively corresponding to the amplitude and the phase of the power supply of the second alternating-current power supply (2), if so, closing a power winding control switch (K2), enabling the rotating speed of the motor to be lower than the synchronous rated rotating speed through controlling the amplitude and the phase of the output current of the converter at the side of the motor, enabling the converter at the side of the net to work in an inversion state, and keeping the voltage at the two ends of the capacitor C constant; if not, return to step 9.
5. The brushless doubly-fed motor starting control method capable of multi-mode operation according to claim 4, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
6. The brushless doubly-fed motor starting control method capable of multi-mode operation according to claim 4, 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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