CN114094893B - Vector control system based on third harmonic excitation synchronous motor - Google Patents
Vector control system based on third harmonic excitation synchronous motor Download PDFInfo
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- CN114094893B CN114094893B CN202111252200.2A CN202111252200A CN114094893B CN 114094893 B CN114094893 B CN 114094893B CN 202111252200 A CN202111252200 A CN 202111252200A CN 114094893 B CN114094893 B CN 114094893B
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/03—Synchronous motors with brushless excitation
Abstract
The invention discloses a vector control system based on a third harmonic excitation synchronous motor, which comprises an electric excitation synchronous motor in the system, wherein the electric excitation synchronous motor in the system is connected with a speed measuring encoder, a stator power supply circuit and a rectifying circuit; the speed measuring encoder is connected with the electro-excitation synchronous motor and the main control system; the stator power supply circuit is connected with the harmonic extraction circuit, the electric excitation synchronous motor and the main control system; the harmonic extraction circuit is connected with the stator power supply circuit and the rotary transformer; the rotary transformer is connected with the wave extraction circuit and the rectification circuit; the rectification circuit is connected with the rotary transformer and the electro-magnetic synchronous motor; the main control system is connected with the stator power supply circuit and the speed measuring encoder. The invention realizes that the harmonic wave on the stator side of the electric excitation synchronous motor is used as a motor excitation source, and the energy utilization rate of the system is improved, the structure of the system is obviously simplified, and the system has better universality by extracting harmonic wave energy on AB two phases in a stator power supply circuit as the excitation source.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an excitation system which uses a third harmonic component of stator current as an excitation source and performs excitation through a rotary transformer so as to optimize an electric excitation synchronous motor.
Background
In recent years, the economic development is accompanied by the severe consumption of energy, and the improvement of energy utilization rate is urgent for various industries. In the field of motor control, compared with other types of motors, the electric excitation synchronous motor has obvious advantages: high load operation capability, easy maintenance, adjustable power factor, high efficiency and the like.
The excitation systems of the current electric excitation motor can be divided into two main types according to the adopted rectification mode: DC generator excitation system and AC rectification excitation system. The DC generator excitation system is gradually eliminated due to the problems of reversing spark, abrasion and the like of the DC motor. The exciting power supply in the AC rectifying exciting system is an AC power supply, and the AC power output by the AC rectifying exciting system is supplied to a host for excitation after being rectified by a semiconductor. With the development of power electronics and power electronics technology, ac excitation systems are increasingly used.
Harmonic magnetic fields in electric motors are objectively present and generally seek to reduce or eliminate the effects of harmonics on motor performance. However, the harmonic wave is adopted for excitation on the premise of not influencing the performance of the motor, so that the harmonic wave magnetic field in the motor is skillfully utilized. Since the 70 s of the last century, research on the utilization of the third harmonic magnetic field in the air gap has been started domestically, and the third harmonic magnetic field is successfully applied to the excitation system of the synchronous generator to form a synchronous generator excited by the third harmonic.
The principle of the traditional third harmonic excitation generator is that a set of harmonic windings are placed in stator core slots of the third harmonic excitation generator, alternating current is induced by utilizing a harmonic magnetic field in an air gap, and the alternating current is rectified to obtain a direct current power supply, and then the direct current power supply is directly supplied to the generator for excitation through an electric brush to form a third harmonic brush excitation system; if the alternating current is supplied to the exciting winding of the alternating current exciter, the alternating current generated by the armature of the alternating current exciter is rectified by the rotary rectifier and then supplied to the main exciting winding, so that the third harmonic brushless exciting system is formed. At present, third harmonic excitation has become a common excitation mode of small and medium-sized synchronous generators.
The research of the harmonic excitation technology further simplifies the structure of the motor system, saves more resources, greatly improves the energy utilization rate, and makes great contribution to the green energy-saving development trend of the industry. Meanwhile, the motor excited by the harmonic wave has the advantages of good voltage stability, excitation still provided when the main winding is short-circuited, simple structure, convenient maintenance, lower cost and the like.
The traditional third harmonic excitation mode requires to design an additional excitation winding in a motor stator, which obviously increases the complexity of the motor structure, generates certain limitation on the design of a motor stator slot type and a winding, and has unobvious compound excitation characteristics. This approach is applicable to synchronous generators, which have poor efficiency for synchronous motors.
Disclosure of Invention
The invention aims to provide a vector control system based on a third harmonic excitation synchronous motor, which uses harmonic components in a stator as excitation sources, improves the energy utilization rate of the system and simplifies the system structure.
In order to achieve the above purpose, the present invention provides the following technical solutions: the vector control system based on the third harmonic excitation synchronous motor comprises an electric excitation synchronous motor in the system, wherein the electric excitation synchronous motor in the system is connected with a speed measuring encoder, a stator power supply circuit and a rectifying circuit; the speed measuring encoder is connected with the electro-excitation synchronous motor and the main control system; the stator power supply circuit is connected with the harmonic extraction circuit, the electric excitation synchronous motor and the main control system; the harmonic extraction circuit is connected with the stator power supply circuit and the rotary transformer; the rotary transformer is connected with the wave extraction circuit and the rectification circuit; the rectification circuit is connected with the rotary transformer and the electro-magnetic synchronous motor; the main control system is connected with the stator power supply circuit and the speed measuring encoder.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes that the harmonic wave on the stator side of the electric excitation synchronous motor is used as a motor excitation source, and the energy utilization rate of the system is improved, the structure of the system is obviously simplified and the system has better universality by extracting the harmonic wave energy on the AB two phases in the stator power supply circuit as the excitation source; meanwhile, the bus voltage and current reconstruction technology further reduces the number of voltage and current sensors to two, greatly reduces the number of sensors, simplifies hardware circuits and increases the system digitization degree.
Drawings
Fig. 1 is a circuit diagram of a vector control system based on a third harmonic excitation synchronous motor of the present invention.
1. An electro-magnetic synchronous motor; 2. a speed measuring encoder; 3. a stator power supply circuit; 4. a harmonic extraction circuit; 5. a rotary transformer; 6. a rectifying circuit; 7. a master control system; 8. a PWM inverter circuit; 9. a bus DC power supply; 10. a bus voltage current sensor; 11. extracting a first capacitor by harmonic waves; 12. extracting a second capacitor by harmonic waves; 13. harmonic wave extraction inductance; 14. a rotation speed PI regulator; 15. stator torque current PI regulator; 16. a first coordinate conversion module; 17. a space vector pulse width modulation module; 18. a voltage and current reconstruction module; 19. a second coordinate conversion module; 20. an air gap flux linkage controller; 21. a flux linkage observer; 22. a harmonic current calculation module; 23. stator exciting current PI regulator.
Detailed Description
Referring to fig. 1, the present invention provides a technical solution: the vector control system based on the third harmonic excitation synchronous motor comprises an electric excitation synchronous motor 1 in the system, wherein the electric excitation synchronous motor 1 in the system is connected with a speed measuring encoder 2, a stator power supply circuit 3 and a rectifying circuit 6; the speed measuring encoder 2 is connected with the electro-magnetic synchronous motor 1 and the main control system 7; the stator power supply circuit 3 is connected with the harmonic extraction circuit 4, the electric excitation synchronous motor 1 and the main control system 7; the harmonic extraction circuit 4 is connected with the stator power supply circuit 3 and the rotary transformer 5; the resolver 5 is connected to the wave extraction circuit 4 and the rectifier circuit 6; the rectifier circuit 6 is connected with the rotary transformer 5 and the electro-magnetic synchronous motor 1; the main control system 7 is connected with the stator power supply circuit 3 and the speed measuring encoder 2.
The stator power supply circuit 3 consists of a PWM inverter circuit 8, a bus direct current power supply 9 and a bus voltage and current sensor 10; and the PWM inverter circuit 8 is connected with the busbar voltage and current sensor 10 and then connected with the busbar direct current power supply 9. The voltage and current information collected by the bus voltage and current sensor 10 and the output signal of the space vector pulse width modulation module 17 are subjected to a voltage and current reconstruction module 18 to obtain the phase current and voltage value of the stator side.
The harmonic extraction circuit 4 consists of a harmonic extraction first capacitor 11, a harmonic extraction inductor 13 and a harmonic extraction second capacitor 12 which are connected in sequence; and the harmonic extraction inductance 13 is a primary side winding of the resolver 5.
The main control system 7 comprises a connecting rotating speed PI regulator 14 and a stator torque current PI regulator 15; the stator torque current PI regulator 15 is connected with the rotating speed PI regulator 14, the second coordinate conversion module 19, the harmonic current calculation module 22 and the first coordinate conversion module 16; the first coordinate conversion module 16 is connected with the stator torque current PI regulator 15, the stator exciting current PI regulator 23 and the space vector pulse width modulation module 17; the space vector pulse width modulation module 17 is connected with the first coordinate conversion module 16 and the voltage and current reconstruction module 18; the voltage and current reconstruction module 18 is connected with the space vector pulse width modulation module 17, the flux linkage observer 21 and the second coordinate conversion module 19; the second coordinate conversion module 19 is connected with the voltage-current reconstruction module 18, the stator exciting current PI regulator 23 and the stator torque current PI regulator 15; the air gap flux linkage controller 20 is connected with a flux linkage observer 21, a harmonic current calculation module 22 and a stator excitation current PI regulator 23; the flux linkage observer 21 is connected with the voltage and current reconstruction module 18 and the air gap flux linkage controller 20; the harmonic current calculation module 22 is connected with the air gap flux linkage controller 20, the current PI regulator 15 and the stator exciting current PI regulator 23; the stator exciting current PI regulator 23 is connected to the second coordinate conversion module 19, the air gap flux linkage controller 20, the harmonic current calculation module 22, and the first coordinate conversion module 16.
The invention also provides an operation method based on the third harmonic excitation synchronous motor vector control system, wherein the harmonic extraction circuit 4 of the control system consists of a harmonic extraction first capacitor 11, a harmonic extraction second capacitor 12 and a harmonic extraction inductor 13, harmonic energy on a stator power supply line is extracted, the harmonic energy is input into a primary side winding of the rotary transformer 5, the primary side winding is coupled to a secondary side winding through magnetic field modulation, the secondary side winding is sent into an excitation winding of the electric excitation synchronous motor 1 after passing through the rectifying circuit 6 to establish a magnetic field, third harmonic excitation is realized, and the harmonic extraction inductor 13 is the primary side winding of the rotary transformer 5, so that the system structure is greatly simplified. The excitation current expected value obtained by the air gap flux linkage controller 20 is converted into a stator harmonic current value by a harmonic current calculation module 22, and harmonic injection is performed at the stator torque current PI regulator 15 and the stator excitation current PI regulator 23 respectively. Compared with a harmonic excitation mode of adding a stator harmonic winding, the method has the advantages of smaller influence on the motor, stronger universality, strong compound excitation characteristic and remarkable structural simplification.
A common vector control system needs a plurality of sensors to collect two-phase or three-phase voltage and current of a stator and bus voltage, and the third harmonic excitation synchronous motor vector control system can be replaced by the bus voltage and current sensor 10 and the voltage and current reconstruction module 18. The voltage and current reconstruction module 18 performs reconstruction calculation of the voltage and current of the stator through the collected bus voltage and current of the SVPWM inverter and the SVPWM control signal, so that the voltage and current of the stator can be obtained, the number of sensors is greatly reduced, a hardware circuit is simplified, and the digitization degree of the system is increased.
The vector control system based on the third harmonic excitation synchronous motor extracts the AB phase third harmonic in the stator power supply line, inputs the AB phase third harmonic into the primary side winding of the rotary transformer, is coupled to the secondary side winding through magnetic field modulation, and the secondary side winding is sent to the excitation winding of the electric excitation motor through rectification to establish a magnetic field, so that third harmonic excitation is realized. On the premise of meeting all performances of the electro-magnetic synchronous motor, the structure is simplified, and the energy utilization rate is improved; meanwhile, the invention provides a harmonic excitation control system, which does not change the motor body, increases the universality of the system, reduces the use of a sensor, and has great practical significance for the development of the electro-excited synchronous motor.
Claims (5)
1. The vector control system based on the third harmonic excitation synchronous motor is characterized in that: the system comprises an electric excitation synchronous motor (1) in the system, wherein the electric excitation synchronous motor (1) in the system is connected with a speed measuring encoder (2), a stator power supply circuit (3) and a rectifying circuit (6); the speed measuring encoder (2) is connected with the electro-magnetic synchronous motor (1) and the main control system (7); the stator power supply circuit (3) is connected with the harmonic extraction circuit (4), the electro-magnetic synchronous motor (1) and the main control system (7); the harmonic extraction circuit (4) is connected with the stator power supply circuit (3) and the rotary transformer (5); the rotary transformer (5) is connected with the harmonic extraction circuit (4) and the rectification circuit (6); the rectification circuit (6) is connected with the rotary transformer (5) and the electro-magnetic synchronous motor (1); the main control system (7) is connected with the stator power supply circuit (3) and the speed measuring encoder (2);
the harmonic extraction circuit (4) consists of a first harmonic extraction capacitor (11), a second harmonic extraction capacitor (12) and a harmonic extraction inductor (13), harmonic energy on a stator power supply line is extracted, the harmonic energy is input into a primary side winding of the rotary transformer (5), the primary side winding is coupled to a secondary side winding through magnetic field modulation, the secondary side winding is sent into an excitation winding of the electro-excitation synchronous motor (1) to establish a magnetic field after passing through the rectification circuit (6), third harmonic excitation is realized, and the harmonic extraction inductor (13) is the primary side winding of the rotary transformer (5); one end of the harmonic extraction first capacitor (11) is connected with one end of the harmonic extraction inductor (13) in series, the other end of the harmonic extraction inductor (13) is connected with one end of the harmonic extraction second capacitor (12) in series, and the other end of the harmonic extraction first capacitor (11) and the other end of the harmonic extraction second capacitor (12) are respectively connected with two phases in a stator power supply circuit.
2. The third harmonic excitation-based synchronous motor vector control system according to claim 1, wherein: the stator power supply circuit (3) consists of a PWM inverter circuit (8), a bus direct-current power supply (9) and a bus voltage and current sensor (10); and the PWM inverter circuit (8) is connected with the bus voltage and current sensor (10) and then connected with the bus direct current power supply (9).
3. The third harmonic excitation-based synchronous motor vector control system according to claim 1, wherein: the main control system (7) comprises a rotating speed PI regulator (14) and a stator torque current PI regulator (15); the stator torque current PI regulator (15) is connected with the rotating speed PI regulator (14), the second coordinate conversion module (19), the harmonic current calculation module (22) and the first coordinate conversion module (16); the first coordinate conversion module (16) is connected with the stator torque current PI regulator (15), the stator exciting current PI regulator (23) and the space vector pulse width modulation module (17); the space vector pulse width modulation module (17) is connected with the first coordinate conversion module (16) and the voltage and current reconstruction module (18); the voltage and current reconstruction module (18) is connected with the space vector pulse width modulation module (17), the flux linkage observer (21) and the second coordinate conversion module (19); the second coordinate conversion module (19) is connected with the voltage and current reconstruction module (18), the stator exciting current PI regulator (23) and the stator torque current PI regulator (15); the air gap flux linkage controller (20) is connected with the flux linkage observer (21), the harmonic current calculation module (22) and the stator exciting current PI regulator (23); the flux linkage observer (21) is connected with the voltage and current reconstruction module (18) and the air gap flux linkage controller (20); the harmonic current calculation module (22) is connected with the air gap flux linkage controller (20), the current PI regulator (15) and the stator exciting current PI regulator (23); the stator exciting current PI regulator (23) is connected with the second coordinate conversion module (19), the air gap flux linkage controller (20), the harmonic current calculation module (22) and the first coordinate conversion module (16).
4. A method of operating a third harmonic excitation-based synchronous motor vector control system as claimed in claim 3 wherein: the exciting current expected value obtained by the air gap flux linkage controller (20) is converted into a stator harmonic current value through a harmonic current calculation module (22), and harmonic injection is carried out at a stator torque current PI regulator (15) and a stator exciting current PI regulator (23) respectively.
5. The method of operation of a third harmonic excitation-based synchronous motor vector control system according to claim 2, wherein: and after voltage and current information acquired by the bus voltage and current sensor (10) and a space vector pulse width modulation module (17) output signal pass through a voltage and current reconstruction module (18), phase current and voltage values at the stator side are obtained.
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| CN202111252200.2A CN114094893B (en) | 2021-10-27 | 2021-10-27 | Vector control system based on third harmonic excitation synchronous motor |
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| CN202111252200.2A CN114094893B (en) | 2021-10-27 | 2021-10-27 | Vector control system based on third harmonic excitation synchronous motor |
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| CN114094893B true CN114094893B (en) | 2023-09-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7132816B1 (en) * | 2006-02-20 | 2006-11-07 | Hamilton Sundstrand Corporation | Brushless wound field synchronous machine rotor position tracking with exciter stator current harmonic tracking |
| CN101005228A (en) * | 2006-12-14 | 2007-07-25 | 戴文育 | Electric energy increasing changer |
| CN102937787A (en) * | 2011-09-06 | 2013-02-20 | 北京理工大学 | Double-rotary-transformer signal processing system |
| CN103166402A (en) * | 2011-12-08 | 2013-06-19 | 沈阳工业大学 | Magnetism insulating reluctance and short circuit cage integrated rotor brushless electro-magnetic synchronous motor |
-
2021
- 2021-10-27 CN CN202111252200.2A patent/CN114094893B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7132816B1 (en) * | 2006-02-20 | 2006-11-07 | Hamilton Sundstrand Corporation | Brushless wound field synchronous machine rotor position tracking with exciter stator current harmonic tracking |
| CN101005228A (en) * | 2006-12-14 | 2007-07-25 | 戴文育 | Electric energy increasing changer |
| CN102937787A (en) * | 2011-09-06 | 2013-02-20 | 北京理工大学 | Double-rotary-transformer signal processing system |
| CN103166402A (en) * | 2011-12-08 | 2013-06-19 | 沈阳工业大学 | Magnetism insulating reluctance and short circuit cage integrated rotor brushless electro-magnetic synchronous motor |
Non-Patent Citations (1)
| Title |
|---|
| 基于混合磁链观测器电励磁同步电机矢量控制;吴轩钦 等;电机与控制学报;第14卷(第03期);第62-67页 * |
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