CN106899242B - 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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- CN106899242B CN106899242B CN201710291512.1A CN201710291512A CN106899242B CN 106899242 B CN106899242 B CN 106899242B CN 201710291512 A CN201710291512 A CN 201710291512A CN 106899242 B CN106899242 B CN 106899242B
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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 relates to a brushless double-fed motor starting control device and a method, wherein the device comprises a system control unit, a three-phase full-control type power grid side converter, a three-phase full-control type motor side converter, an adjustable resistor switching switch, a current detection sensor and a power winding control switch, wherein the three-phase full-control type power grid side converter, the three-phase full-control type motor side converter, the adjustable resistor switching switch, the current detection sensor 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 advantages are that: on the basis of comprehensively utilizing the four-quadrant operation capability of the three-phase full-control type power grid side converter and the current limiting capability of the adjustable resistor, the starting process dynamically adjusts and controls the winding current by reasonably controlling the conduction time sequence of the power switch device in the three-phase full-control type motor side converter, so that the problems of large current limiting resistor power, slow starting process and the like in the traditional asynchronous starting are solved, the motor starting process is accelerated, the starting loss is reduced, 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. Therefore, in practical processes, brushless doubly-fed machines generally employ an asynchronous starting method. In order to solve the problems existing in the asynchronous starting method adopted by the brushless double-fed motor, the patent document (ZL 201511015056.5) discloses that all power devices of a control winding converter are disconnected, and a braking resistor is connected into a power control winding loop. However, this method has the following disadvantages: (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 (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. The method still cannot realize torque adjustment and starting time controllability in the starting process of the motor and ensure smooth starting of the motor.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a starting control device and a starting control method for a brushless doubly-fed motor, which can dynamically adjust and control winding current by reasonably controlling the conduction time sequence of a power switch device in a three-phase fully-controlled motor side converter in the starting process, thereby solving the problems of larger current-limiting resistor power, slow starting process and the like in the traditional asynchronous starting, accelerating the starting process of the motor and reducing the starting loss.
In order to achieve the above purpose, the invention adopts the following technical scheme:
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 above purpose, the invention provides 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 and a second alternating current power supply, and further comprises an adjustable resistor, an adjustable resistor switching switch, a current detection sensor, 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 a direct current bus capacitor is connected in parallel on the direct current bus;
the alternating current side of the three-phase full-control motor side converter is connected with the control winding of the brushless doubly-fed motor through three-phase adjustable resistors in sequence, the three adjustable resistors are respectively connected with a normally open contact of an adjustable resistor switching switch in parallel, and the current detection sensor is arranged in a control winding loop of the brushless doubly-fed motor; the second alternating current power supply is connected with the power winding of the brushless doubly-fed motor in sequence through a power winding control switch;
the system control unit receives output signals of the current detection sensors and outputs conduction time sequence signals for controlling power switching devices in the three-phase full-control type motor side converter, and a control sequence executed by the system control unit comprises:
step 1: the system control unit is initialized, and the adjustable resistor switching switch and the power winding control switch are disconnected, so that the value of the adjustable resistor is at the maximum value;
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: the system control unit sends out an instruction to turn off the power switching devices, then turns on the power winding control switch, and turns on three power switching devices of the lower half bridge of the three-phase full-control motor side converter, so that the current of the power winding is increased;
step 4: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise executing the step 6;
step 5: turning off three power switching devices of a lower half bridge of the three-phase full-control motor side converter, and executing the step 4;
step 6: three power switching devices of a lower half bridge of the three-phase full-control motor side converter are conducted;
step 7: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise, executing the step 8;
step 8: detecting the average value of the absolute value of the control winding current, if the average value is larger than the lower limit of the critical set area value, executing the step 6, otherwise, executing the step 9;
step 9: the resistance value of the adjustable resistor is reduced, so that the current of the power winding is increased;
step 10: judging the resistance value of the adjustable resistor, if the resistance value does not reach the minimum set value, executing the step 7, otherwise, executing the step 11;
step 11: closing the adjustable resistor switching switch to finish the starting process, and switching the brushless double-fed motor into 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 three-phase fully-controlled power grid side converter reaches a rated value.
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, an adjustable resistor switching switch, a current detection sensor, a power winding control switch and a system control unit, and comprises the following steps:
step 1: the system control unit is initialized, and the adjustable resistor switching switch and the power winding control switch are disconnected, so that the value of the adjustable resistor is at the maximum value;
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: the system control unit sends out an instruction to turn off the power switching devices, then turns on the power winding control switch, and turns on three power switching devices of the lower half bridge of the three-phase full-control motor side converter, so that the current of the power winding is increased;
step 4: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise executing the step 6;
step 5: turning off three power switching devices of a lower half bridge of the three-phase full-control motor side converter, and executing the step 4;
step 6: three power switching devices of a lower half bridge of the three-phase full-control motor side converter are conducted;
step 7: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise, executing the step 8;
step 8: detecting the average value of the absolute value of the control winding current, if the average value is larger than the lower limit of the critical set area value, executing the step 6, otherwise, executing the step 9;
step 9: the resistance value of the adjustable resistor is reduced, so that the current of the power winding is increased;
step 10: judging the resistance value of the adjustable resistor, if the resistance value does not reach the minimum set value, executing the step 7, otherwise, executing the step 11;
step 11: closing the adjustable resistor switching switch to finish the starting process, and switching the brushless double-fed motor into 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 three-phase fully-controlled power grid side converter reaches a rated value.
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: on the basis of comprehensively utilizing the four-quadrant operation capability of the three-phase full-control type power grid side converter and the current limiting capability of the adjustable resistor, the starting process dynamically adjusts and controls the winding current by reasonably controlling the conduction time sequence of the power switch device in the three-phase full-control type motor side converter, so that the problems of large current limiting resistor power, slow starting process and the like in the traditional asynchronous starting are solved, the motor starting process is accelerated, the starting loss is reduced, 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, adjustable resistors R1 to R3, an adjustable resistor switching switch K1, current detection sensors H1 to H2, 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 alternating current side of the three-phase full-control motor side converter is connected with the control winding of the brushless doubly-fed motor through three-phase adjustable resistors R1-R3 in sequence, the three adjustable resistors R1-R3 are respectively connected with a normally open contact of an adjustable resistor switching switch K1 in parallel, and current detection sensors H1-H2 are arranged in a control winding loop of the brushless doubly-fed motor. 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 adjustable resistor switching switch K1, the current detection sensors H1-H2 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:
the system control unit 6 receives output signals of the current detection sensors H1-H2, outputs a turn-on timing signal for controlling the power switching devices in the three-phase fully-controlled motor-side converter 4, and a control sequence executed by the system control unit 6 includes: the control sequence executed by the system control unit 6 includes:
step 1: the system control unit 6 is initialized, and the adjustable resistor switching switch K1 and the power winding control switch K2 are disconnected, so that the values of the adjustable resistors R1-R3 are at the maximum value;
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: the system control unit 6 sends out an instruction to turn off the power switching devices S7-S12, then turns on the power winding control switch K2, and turns on the three power switching devices S8, S10 and S12 of the lower half bridge of the three-phase full-control motor side converter 4 to increase the current of the power winding;
step 4: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise executing the step 6;
step 5: turning off three power switching devices S8, S10 and S12 of a lower half bridge of the three-phase full-control motor side converter 4, and executing the step 4;
step 6: the three power switching devices S8, S10 and S12 of the lower half bridge of the three-phase full-control motor side converter 4 are conducted;
step 7: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise, executing the step 8;
step 8: detecting the average value of the absolute value of the control winding current, if the average value is larger than the lower limit of the critical set area value, executing the step 6, otherwise, executing the step 9;
step 9: the resistance value of the adjustable resistors R1-R3 is reduced, so that the current of the power winding is increased;
step 10: judging the resistance value of the adjustable resistors R1-R3, if the resistance value does not reach the minimum set value, executing the step 7, otherwise, executing the step 11;
step 11: the adjustable resistor switching switch K1 is closed, the starting process is completed, and the brushless doubly-fed motor 7 is switched into 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 (8)
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 device further comprises adjustable resistors R1-R3, an adjustable resistor switching switch (K1), a current detection sensor (H1-H2), 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, and a direct current bus capacitor (C) is connected in parallel on the direct current bus;
the alternating current side of the three-phase full-control motor side converter is connected with the control winding of the brushless doubly-fed motor through three-phase adjustable resistors R1-R3 in sequence, the three adjustable resistors R1-R3 are respectively connected with a normally open contact of an adjustable resistor switching switch (K1) in parallel, and a current detection sensor (H1-H2) is arranged in a control winding loop of the brushless doubly-fed motor; 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) in sequence;
the three-phase full-control type power grid side converter (3), the three-phase full-control type motor side converter (4), the adjustable resistor switching switch (K1) and the current detection sensor (H1-H2) are respectively connected with the system control unit (6), the system control unit (6) receives output signals of the current detection sensor (H1-H2) and outputs and controls conduction time sequence signals of power switching devices in the three-phase full-control type motor side converter (4), and a control sequence executed by the system control unit comprises:
step 1: the system control unit (6) is initialized, and the adjustable resistor switching switch (K1) and the power winding control switch (K2) are disconnected, so that the values of the adjustable resistors R1-R3 are at the maximum value;
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: the system control unit (6) sends out an instruction to turn off the power switching devices (S7-S12), then turns on the power winding control switch (K2), and turns on the three power switching devices (S8, S10 and S12) of the lower half bridge of the three-phase fully-controlled motor side converter (4) to increase the current of the power winding;
step 4: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise executing the step 6;
step 5: turning off three power switching devices (S8, S10 and S12) of a lower half bridge of the three-phase full-control motor side converter (4), and executing the step 4;
step 6: three power switching devices (S8, S10 and S12) of a lower half bridge of the three-phase full-control motor side converter (4) are conducted;
step 7: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise, executing the step 8;
step 8: detecting the average value of the absolute value of the control winding current, if the average value is larger than the lower limit of the critical set area value, executing the step 6, otherwise, executing the step 9;
step 9: the resistance value of the adjustable resistors R1-R3 is reduced, so that the current of the power winding is increased;
step 10: judging the resistance value of the adjustable resistors R1-R3, if the resistance value does not reach the minimum set value, executing the step 7, otherwise, executing the step 11
Step 11: and closing the adjustable resistor switching switch (K1) to finish the starting process, and switching the brushless doubly-fed motor (7) into 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: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
4. A brushless doubly fed motor starting control device as claimed in claim 1 or 2, wherein: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are different alternating current power supplies.
5. A brushless double-fed motor starting control method is characterized in that: the method is provided with 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), adjustable resistors R1-R3, an adjustable resistor switching switch (K1), current detection sensors (H1-H2), a power winding control switch (K2) and a system control unit (6), and comprises the following steps:
step 1: the system control unit (6) is initialized, and the adjustable resistor switching switch (K1) and the power winding control switch (K2) are disconnected, so that the values of the adjustable resistors R1-R3 are at the maximum value;
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: the system control unit (6) sends out an instruction to turn off the power switching devices (S7-S12), then turns on the power winding control switch (K2), and turns on the three power switching devices (S8, S10 and S12) of the lower half bridge of the three-phase fully-controlled motor side converter (4) to increase the current of the power winding;
step 4: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise executing the step 6;
step 5: turning off three power switching devices (S8, S10 and S12) of a lower half bridge of the three-phase full-control motor side converter (4), and executing the step 4;
step 6: three power switching devices (S8, S10 and S12) of a lower half bridge of the three-phase full-control motor side converter (4) are conducted;
step 7: detecting the average value of the absolute value of the control winding current, if the average value is larger than the upper limit of the critical set area value, executing the step 5, otherwise, executing the step 8;
step 8: detecting the average value of the absolute value of the control winding current, if the average value is larger than the lower limit of the critical set area value, executing the step 6, otherwise, executing the step 9;
step 9: the resistance value of the adjustable resistors R1-R3 is reduced, so that the current of the power winding is increased;
step 10: judging the resistance value of the adjustable resistors R1-R3, if the resistance value does not reach the minimum set value, executing the step 7, otherwise, executing the step 11;
step 11: and closing the adjustable resistor switching switch (K1) to finish the starting process, and switching the brushless doubly-fed motor (7) into a normal running state.
6. The brushless doubly-fed motor starting control method as claimed in claim 5, 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.
7. The brushless doubly fed motor starting control method according to claim 5 or 6, characterized in that: wherein the first alternating current power supply (1) and the second alternating current power supply (2) are the same alternating current power supply.
8. The brushless doubly fed motor starting control method according to claim 5 or 6, characterized in that: 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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| 基于锁相环和双模速度双重控制的永磁无刷直流电机的研究;徐春雷等;《电气传动自动化》;20160201(第01期);全文 * |
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| CN106899242A (en) | 2017-06-27 |
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