CN108988730B - Integrated driving power converter of switched reluctance motor of electric automobile and control method - Google Patents

Integrated driving power converter of switched reluctance motor of electric automobile and control method Download PDF

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Publication number
CN108988730B
CN108988730B CN201810817504.0A CN201810817504A CN108988730B CN 108988730 B CN108988730 B CN 108988730B CN 201810817504 A CN201810817504 A CN 201810817504A CN 108988730 B CN108988730 B CN 108988730B
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reluctance motor
switched reluctance
phase
phase winding
converter
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CN108988730A (en
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蔡骏
赵兴强
刘泽远
贾红云
吴少龙
向程
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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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
    • 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
    • H02P25/08—Reluctance motors
    • H02P25/092—Converters specially adapted for controlling reluctance motors
    • 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/28—Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases

Abstract

The invention discloses an integrated driving power converter of a switched reluctance motor of an electric vehicle and a control method, which realize the integration of a DC-DC converter, the switched reluctance motor and a driving power converter thereof, a single-phase vehicle-mounted charger and a hardware system of a motor body and realize various control algorithms of voltage and speed regulation, constant-voltage speed regulation, high-voltage follow current, constant-voltage charging and the like of the switched reluctance motor. The integrated vehicle-mounted charger does not change a topological structure, and the switch device and the two-phase winding of the motor are multiplexed, so that the light and intelligent motor driving system is facilitated; under the control of voltage regulation and speed regulation, the speed regulation control algorithm and the driving control algorithm of the switched reluctance motor are decoupled, so that the switching loss of a motor driving power converter is reduced; the DC-DC converter provides a constant voltage value smaller than the turn-off follow current voltage of the switched reluctance motor for the motor bus, thereby realizing the voltage and speed regulation function under the high-voltage follow current capability, shortening the winding follow current time and hopefully greatly enhancing the output of the motor.

Description

Integrated driving power converter of switched reluctance motor of electric automobile and control method
Technical Field
The invention relates to an integrated driving power converter of an electric automobile switch reluctance motor and a control method, belonging to the technical field of electric automobile driving motors of motors and control thereof.
Background
One of the important core technologies of electric vehicles is a motor driving system. The whole trend of the technical development of the motor driving system of the electric automobile can be divided into three directions of permanent magnet high efficiency, power electronic integration and electromechanical integration. The core part of the motor driving system is a motor, and various motor forms including a direct current motor and an alternating current asynchronous motor in the aspect of vehicle motors are applied in the development history of electric vehicles. Because the permanent magnet synchronous motor has the advantages of high power density, high efficiency of a full working area, good dynamic performance and the like, the permanent magnet synchronous motor is the first choice of the motor for the electric automobile since the last century. Permanent magnetic materials are used as strategic resources, and are scarce and expensive. The switched reluctance motor has gained more and more attention in the field of electric vehicles as a representative of rare earth-free permanent magnet motors, and will become an important development direction of future electric vehicle driving systems.
The winding of the switched reluctance motor has a follow current process, the impact of the follow current process on a power supply is large, and braking torque can be generated, so that the operating efficiency of the switched reluctance motor is influenced. In the prior art, in order to improve the winding follow current process, research and development are carried out on a circuit topological structure of a motor drive control system, and the miniaturization and the intellectualization of the switched reluctance motor of the electric automobile are not facilitated due to the increase of components and the complexity of a circuit structure. For the drive control of the switched reluctance motor for the electric automobile, in order to improve the system output, an important idea is to reduce the time for the current of the winding to follow current, and the method is to increase the voltage of phase cut-off. Therefore, designing the vehicle-used switched reluctance motor with high voltage follow current capability and the topology of the driving power converter thereof is an important technical development direction.
In the prior art, a traditional electric vehicle motor driving system and a battery charging system are independent. A huge vehicle-mounted charger usually occupies the whole vehicle space of the electric vehicle, the weight of the vehicle body is increased, and the system cost is increased. Therefore, it is an important development to integrate the vehicle charger and the motor power converter.
For a switched reluctance motor, the realization of the integral integration of a motor driving power converter, a vehicle-mounted charger, a high-voltage follow current function and the like is a new research direction. In addition, the inductance characteristic of the motor winding is skillfully utilized to construct an integrated vehicle-mounted charger, so that the size, the weight and the cost of the charger can be further reduced. Therefore, the method for integrating the switch reluctance motor body, the power converter and the vehicle-mounted charger integrally not only realizes hardware integration from mechanical and electrical aspects, but also realizes control algorithm integration of system functions. This is also an important technology for the development of a drive system for an electric vehicle, which is lightweight, multi-functional, and low-cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the integrated driving power converter is provided with a switch reluctance motor body, a driving power converter, a vehicle-mounted integrated charging function and a multifunctional integrated control algorithm.
The invention adopts the following technical scheme for solving the technical problems:
the utility model provides an electric automobile switched reluctance motor integrated drive power converter for the hardware system integration of DC-DC converter, switched reluctance motor and drive power converter, single-phase on-vehicle charger, its characterized in that: the system comprises a direct-current storage battery (1), a DC-DC converter (2), a switched reluctance motor and a driving power converter (3) thereof and a single-phase alternating-current charging power supply (4); the DC-DC converter is provided with an anode input port, an anode output port and a cathode port; the switched reluctance motor and the driving power converter thereof are provided with a bus input port, a positive input port, a negative port and two single-phase alternating current power input ports.
The positive pole of the direct current storage battery (1) is connected with the positive pole input port of the DC-DC converter (2) and the positive pole input port of the switched reluctance motor and the driving power converter (3) thereof, the negative pole of the direct current storage battery (1) is connected with the negative pole port of the DC-DC converter (2) and the negative pole port of the switched reluctance motor and the driving power converter (3) thereof, the bus input port of the switched reluctance motor and the driving power converter (3) thereof is connected with the positive pole output port of the DC-DC converter (2), and the single-phase alternating current charging power supply (4) is connected with the two alternating current single-phase power supply input ports of the switched reluctance motor and the driving power converter (3) thereof.
The DC-DC converter comprisesA switch tube K1A second switch tube K2A first power diode D1A second power diode D2An input filter capacitor C1An output filter capacitor C2An energy storage inductor L;
first switch tube K1Collector electrode of, and first power diode D1Cathode and input filter capacitor C1Is connected with the positive input port of the DC-DC converter (2), and a first switching tube K1Emitter and second switch tube K2Collector electrode of, and first power diode D1Anode of (2), second power diode D2One end of the cathode and the energy storage inductor L is connected with the point A, and the second switch tube K2Emitter electrode of, second power diode D2Anode of, and input filter capacitor C1Negative terminal and output filter capacitor C2Is connected with the negative terminal of the DC-DC converter (2); output filter capacitor C2The positive end of the energy storage inductor L is connected with the other end of the energy storage inductor L at a point B, and the point B is connected with the positive electrode output port of the DC-DC converter (2).
The switched reluctance motor and the driving power converter thereof comprise an A-phase winding and driving circuit (5), a B-phase winding and driving circuit (6) and a C-phase winding and driving circuit (7); the phase-A winding and driving circuit and the phase-B winding and driving circuit are respectively provided with a bus input port, an anode input port, a cathode port and a single-phase alternating-current power supply input port, and the phase-C winding and driving circuit is provided with a bus input port, an anode input port and a cathode port.
The bus input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the bus input port of the switched reluctance motor and the driving power converter thereof, the positive input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the positive input port of the switched reluctance motor and the driving power converter thereof, the negative ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the negative port of the switched reluctance motor and the driving power converter thereof, and the single-phase alternating current power input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit are respectively connected with the two ends of the single-phase alternating current.
The A-phase winding and driving circuit (5) comprises a third switching tube K3And a fourth switching tube K4A third power diode D3A fourth power diode D4And a switched reluctance motor phase A winding; third switch tube K3The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the driving power converter thereof at the point B, and the third switch tube K3Emitter and switched reluctance motor A phase winding LAOne terminal of (1), a fourth power diode D4Is connected to the cathode of A1A point, and A1The point is connected with the A-phase winding and one input port of a single-phase alternating current power supply of the driving circuit (5); switched reluctance motor A phase winding LAAnother terminal of (D), a third power diode (D)3Anode and fourth switching tube K4Is connected to A2Point; third power diode D3The cathode of the phase-A winding is connected with the input port of the anode of the phase-A winding and the drive circuit (5); fourth power diode D4Anode and fourth switching tube K4The emitter phase of the phase-A transformer is connected with the A-phase winding and the negative electrode port of the drive circuit (5).
The B-phase winding and driving circuit (6) comprises a fifth switching tube K5And a sixth switching tube K6A fifth power diode D5Sixth power diode D6And a switched reluctance motor B phase winding; fifth switch tube K5The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the drive power converter thereof at a point B, and a fifth switch tube K5Emitter and B-phase winding L of switched reluctance motorBOne end of (1), a sixth power diode D6Is connected to the cathode of B1A dot, and B1The point is connected with the other input port of the single-phase alternating current power supply of the B-phase winding and the driving circuit (6); b-phase winding L of switched reluctance motorBAnother terminal of (1), a fifth power diode D5Anode and sixth switching tube K6Set of (1)Electrode phase is connected to B2Point; fifth power diode D5The cathode of the phase-B winding is connected with the input port of the positive pole of the phase-B winding and the drive circuit (6); sixth power diode D6Anode and sixth switching tube K6The emitter phase of the transformer is connected with the B-phase winding and the negative electrode port of the driving circuit (6).
The C-phase winding and driving circuit (7) comprises a seventh switching tube K7The eighth switching tube K8Seventh power diode D7Eighth power diode D8And a switched reluctance motor C phase winding; seventh switching tube K7The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the drive power converter thereof at a point B, and a seventh switch tube K7Emitter and C-phase winding L of switched reluctance motorCOne end of (1), an eighth power diode D8Is connected to C1Point; c-phase winding L of switched reluctance motorCAnother terminal of (1), a seventh power diode D7Anode and eighth switching tube K8Is connected to C2Point; seventh power diode D7The cathode of the phase-C winding is connected with the input port of the positive pole of the C-phase winding and the drive circuit (7); eighth power diode D8Anode of and eighth switching tube K8The emitter phase of the transformer is connected with the C-phase winding and the negative electrode port of the drive circuit (7).
And the bus input port of the switched reluctance motor and the driving power converter thereof and the positive output port of the DC-DC converter are connected to a point A, and the bus voltage of the switched reluctance motor and the driving power converter thereof is the output voltage of the DC-DC converter.
The turn-off freewheeling circuit for the A-phase winding includes: the phase A winding, the third power diode, the direct-current storage battery and the fourth power diode; the turn-off freewheeling circuit for the B-phase winding includes: the phase B winding, the fifth power diode, the direct-current storage battery and the sixth power diode; the turn-off freewheeling circuit for the C-phase winding includes: the phase C winding, the seventh power diode, the direct-current storage battery and the eighth power diode; the turn-off follow current voltage of each phase winding is the battery voltage.
The voltage of the storage battery is greater than the output voltage of the DC-DC converter, and the turn-off follow current voltage of each phase winding is greater than the bus voltage of the switched reluctance motor and the drive power converter thereof.
The single-phase alternating current charging power supply is formed by serially connecting a single-phase alternating current power supply AC and a contact switch SW, and two ports of the single-phase alternating current charging power supply are respectively connected with two single-phase alternating current power supply input ports of the switched reluctance motor and the driving power converter thereof.
The control method of the integrated driving power converter of the switched reluctance motor of the electric automobile adopts a plurality of control algorithms of voltage regulation and speed regulation, constant voltage speed regulation, high voltage follow current, constant voltage charging and the like of the software integrated switched reluctance motor, so that the integrated driving power converter has a plurality of functions of bus automatic voltage regulation, switched reluctance motor phase turn-off high voltage follow current capability, vehicle-mounted integrated charging function and the like.
The control methods are described below, respectively.
(1) The voltage and speed regulation control method of the switched reluctance motor integrated drive power converter is divided into the following two types: the first is to regulate a first switch tube K according to the actual rotating speed of the motor under the open-loop driving control mode of the rotating speed of the switched reluctance motor1And a second switching tube K2Realizing the output voltage U of the DC-DC converterIDynamic regulation of (U)ICan be between 0 and the voltage U of the storage batterySThe change between the two modes enables the switched reluctance motor to have the automatic voltage and speed regulation capability. The second method is that under the closed-loop control mode of the rotating speed of the switched reluctance motor, the rotating speed deviation is controlled by a PI regulator according to the given reference rotating speed to obtain the current reference value of the energy storage inductor L, and then the deviation between the actual value and the reference value of the current of the energy storage inductor is controlled by the PI regulator to obtain the first switching tube K1And a second switching tube K2Thereby realizing the output voltage U of the DC-DC converterIThe dynamic regulation of the voltage of the bus realizes the closed-loop control of the rotating speed of the switched reluctance motor with the dynamic regulation of the bus voltage.
(2) The provided constant voltage speed regulation control method of the switched reluctance motor integrated drive power converter comprises the following steps: giving an output in the DC-DC converterVoltage UIThe PI regulator controls the deviation between the actual output voltage and the given voltage to obtain a current reference value of the energy storage inductor L, and the PI regulator controls the deviation between the actual value and the reference value of the energy storage inductor current to obtain a first switching tube K1And a second switching tube K2Realizing the output voltage U of the DC-DC converterIThe constant voltage control of (3). In the presence of UIUnder the condition of bus voltage input, the switched reluctance motor can realize open-loop and closed-loop speed regulation control under the traditional angle position control and chopping control modes.
(3) The high-voltage follow current control method of the switched reluctance motor integrated drive power converter comprises the following steps: in the voltage and speed regulation control method and the constant voltage speed regulation control method of the switched reluctance motor integrated drive power converter, the bus voltage of the switched reluctance motor and the drive power converter thereof is UIThe turn-off follow current voltage of the switched reluctance motor is a negative value-U of the voltage of the storage batterySThe absolute value of the turn-off follow current voltage is greater than the bus voltage of the switched reluctance motor and the drive power converter thereof, so that the switched reluctance motor has high-voltage follow current capability, shortens the winding follow current time, enlarges the opening interval and enlarges the torque output interval.
(4) The constant voltage charging control method of the switched reluctance motor integrated drive power converter comprises the following steps: when the vehicle-mounted integrated charger is in a charging mode, the control system controls the switched reluctance motor to be static, the motor rotor is fixed at the tooth pole alignment position of the C-phase stator rotor, so that the inductances of the A-phase winding and the B-phase winding are equal, the influence of inductance saturation on the inductances of the A-phase winding and the B-phase winding at the position is avoided, and the A-phase winding and the B-phase winding are used as input filter inductances of the single-phase vehicle-mounted integrated charger, so that the hardware integration of the motor body and the vehicle-mounted charger.
When in the charging mode, the control system controls a first switching tube K in the DC-DC converter (2)1A second switch tube K2A first power diode D1A second power diode D2Are all cut off, control the switched reluctance motor and a third switching tube K in a driving power converter (3) thereof3The fifth switch tube K5Seventh switching tube K7The eighth switching tube K8Seventh power diode D7Eighth power diode D8All cutoff; controlling the contact switch SW to close; realize single-phase on-vehicle integrated charger topological structure.
The single-phase vehicle-mounted integrated charger comprises a direct-current storage battery (1) and an input filter capacitor C in a DC-DC converter (2)1Switched reluctance motor, A-phase winding of driving power converter (3) of switched reluctance motor, and A-phase winding L of driving circuitAAnd a fourth switching tube K4A third power diode D3A fourth power diode D4Switched reluctance motor, B-phase winding of driving power converter (3) of switched reluctance motor, and B-phase winding L in driving circuitBAnd a sixth switching tube K6A fifth power diode D5Sixth power diode D6And a single-phase alternating current charging power supply (4); positive pole of DC accumulator and input filter capacitor C1Anode of (2), third power diode D3Cathode of (2), fifth power diode D5The cathode of the anode is connected; negative pole of DC accumulator and input filter capacitor C1Negative electrode and fourth switching tube K4Emitter electrode of, sixth switching tube K6Emitter of (2), fourth power diode D4Anode of (2), sixth power diode D6The anode of the anode is connected; third power diode D3Anode of (2) and phase-A winding LAOne end of, a fourth switching tube K4Is connected to A2Point, fifth power diode D5Anode of and B phase winding LBOne end of (1), a sixth switching tube K6Is connected to B2Point; fourth power diode D4Cathode of (2) and A-phase winding LAThe other end of the single-phase alternating current charging power supply is connected with the A1Point; sixth power diode D6Cathode of and B phase winding LBThe other end of the single-phase alternating current charging power supply is connected with the other end of the B1And (4) point.
In the charging mode, single-phase alternating current introduced by the charging interface passes through an A-phase winding L in the switched reluctance motorAphase-A winding drive circuit, phase-B winding drive circuit, and phase-B winding LBDisclosure of the inventionThe A-phase winding driving circuit and the B-phase winding driving circuit send electric energy to two ends of the storage battery, stable output voltage control is achieved through single-period voltage closed-loop control by giving output voltage, and constant-voltage charging is conducted on the direct-current storage battery.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the invention provides an integrated driving power converter of a switched reluctance motor of an electric vehicle, which realizes the hardware integration of multi-topology structures such as a DC-DC converter, the switched reluctance motor and a driving power converter thereof, a single-phase vehicle-mounted charger and the like on the power topology. When the single-phase vehicle-mounted charger is integrated, the switched reluctance motor and part of switching devices of the switched reluctance motor driving the power converter are multiplexed, so that no switching device is required to be added; in addition, the invention provides the fixed position of the motor rotor in the charging mode, so that the inductances of two-phase windings of the switched reluctance motor are equal and are not influenced by the change of the charging current, and the fixed position can be used as a filter inductance to avoid increasing the large-volume power inductance, so that the whole integrated charger does not increase the whole volume and cost of a motor driving system, and the light-weight and intelligent motor driving system of the electric automobile is facilitated.
(2) In the control method, the voltage regulation and speed regulation and constant voltage speed regulation control functions of the integrated driving power converter are transferred from the switched reluctance motor and the driving power converter thereof to the DC-DC converter, so that the switching frequency and the loss of the motor driving power converter are reduced; and under the voltage-regulating and speed-regulating control of the integrated driving power converter, the driving control and the speed-regulating control of the switched reluctance motor are decoupled. The continuous voltage is higher than the bus voltage of the motor power converter, so that the voltage and speed regulating function under the high-voltage continuous current capability is realized, the winding continuous current time is shortened, and the output of the motor is expected to be greatly enhanced.
(3) The invention provides a solution for the multifunctional integration of the driving and charging system of the switched reluctance motor of the electric vehicle and the flexibility of the driving control of the switched reluctance motor for the vehicle. The integrated drive converter of the switched reluctance motor of the electric vehicle is suitable for pure electric vehicles and various hybrid electric vehicles.
Drawings
FIG. 1 is a circuit topology diagram of an integrated driving power converter of a switched reluctance motor of an electric vehicle according to the present invention
FIG. 2 is a control schematic diagram of open-loop voltage and speed regulation of an integrated drive power converter according to the present invention
FIG. 3 is a control schematic diagram of the closed-loop voltage and speed regulation of the integrated drive power converter according to the present invention
FIG. 4 is a control schematic diagram of open-loop and closed-loop constant-voltage speed regulation of an integrated drive power converter according to the present invention
FIG. 5 is a schematic diagram of a method for integrating a motor winding with a fixed position in a charging mode according to the present invention
FIG. 6 is a method for constructing an integrated vehicle charger integrated with a motor winding inductor and a control schematic diagram thereof
Detailed Description
The invention provides an integrated drive converter of a switched reluctance motor of an electric automobile, which realizes the integration of a DC-DC converter, the switched reluctance motor, a drive power converter thereof, a single-phase vehicle-mounted charger and a hardware system of a motor body, and also realizes the software integration of various control algorithms of voltage regulation and speed regulation, constant voltage speed regulation, high voltage follow current, constant voltage charging and the like of the switched reluctance motor.
The technical scheme of the invention is further explained in detail by combining the attached drawings:
fig. 1 shows a circuit topology diagram of an integrated drive power converter of a switched reluctance motor of an electric vehicle according to the present invention.
The utility model provides an electric automobile switched reluctance motor integrated drive power converter for the hardware system integration of DC-DC converter, switched reluctance motor and drive power converter, single-phase on-vehicle charger, its characterized in that: the system comprises a direct-current storage battery (1), a DC-DC converter (2), a switched reluctance motor and a driving power converter (3) thereof and a single-phase alternating-current charging power supply (4); the DC-DC converter is provided with an anode input port, an anode output port and a cathode port; the switched reluctance motor and the driving power converter thereof are provided with a bus input port, a positive input port, a negative port and two single-phase alternating current power input ports.
The positive pole of the direct current storage battery (1) is connected with the positive pole input port of the DC-DC converter (2) and the positive pole input port of the switched reluctance motor and the driving power converter (3) thereof, the negative pole of the direct current storage battery (1) is connected with the negative pole port of the DC-DC converter (2) and the negative pole port of the switched reluctance motor and the driving power converter (3) thereof, the bus input port of the switched reluctance motor and the driving power converter (3) thereof is connected with the positive pole output port of the DC-DC converter (2), and the single-phase alternating current charging power supply (4) is connected with the two alternating current single-phase power supply input ports of the switched reluctance motor and the driving power converter (3) thereof.
The DC-DC converter comprises a first switching tube K1A second switch tube K2A first power diode D1A second power diode D2An input filter capacitor C1An output filter capacitor C2An energy storage inductor L;
first switch tube K1Collector electrode of, and first power diode D1Cathode and input filter capacitor C1Is connected with the positive input port of the DC-DC converter (2), and a first switching tube K1Emitter and second switch tube K2Collector electrode of, and first power diode D1Anode of (2), second power diode D2One end of the cathode and the energy storage inductor L is connected with the point A, and the second switch tube K2Emitter electrode of, second power diode D2Anode of, and input filter capacitor C1Negative terminal and output filter capacitor C2Is connected with the negative terminal of the DC-DC converter (2); output filter capacitor C2The positive end of the energy storage inductor L is connected with the other end of the energy storage inductor L at a point B, and the point B is connected with the positive electrode output port of the DC-DC converter (2).
The switched reluctance motor and the driving power converter thereof comprise an A-phase winding and driving circuit (5), a B-phase winding and driving circuit (6) and a C-phase winding and driving circuit (7); the phase-A winding and driving circuit and the phase-B winding and driving circuit are respectively provided with a bus input port, an anode input port, a cathode port and a single-phase alternating-current power supply input port, and the phase-C winding and driving circuit is provided with a bus input port, an anode input port and a cathode port.
The bus input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the bus input port of the switched reluctance motor and the driving power converter thereof, the positive input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the positive input port of the switched reluctance motor and the driving power converter thereof, the negative ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the negative port of the switched reluctance motor and the driving power converter thereof, and the single-phase alternating current power input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit are respectively connected with the two ends of the single-phase alternating current.
The A-phase winding and driving circuit (5) comprises a third switching tube K3And a fourth switching tube K4A third power diode D3A fourth power diode D4And a switched reluctance motor phase A winding; third switch tube K3The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the driving power converter thereof at the point B, and the third switch tube K3Emitter and switched reluctance motor A phase winding LAOne terminal of (1), a fourth power diode D4Is connected to the cathode of A1A point, and A1The point is connected with the A-phase winding and one input port of a single-phase alternating current power supply of the driving circuit (5); switched reluctance motor A phase winding LAAnother terminal of (D), a third power diode (D)3Anode and fourth switching tube K4Is connected to A2Point; third power diode D3The cathode of the phase-A winding is connected with the input port of the anode of the phase-A winding and the drive circuit (5); fourth power diode D4Anode and fourth switching tube K4Is connected with the A-phase winding and the negative pole of the drive circuit (5)A port.
The B-phase winding and driving circuit (6) comprises a fifth switching tube K5And a sixth switching tube K6A fifth power diode D5Sixth power diode D6And a switched reluctance motor B phase winding; fifth switch tube K5The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the drive power converter thereof at a point B, and a fifth switch tube K5Emitter and B-phase winding L of switched reluctance motorBOne end of (1), a sixth power diode D6Is connected to the cathode of B1A dot, and B1The point is connected with the other input port of the single-phase alternating current power supply of the B-phase winding and the driving circuit (6); b-phase winding L of switched reluctance motorBAnother terminal of (1), a fifth power diode D5Anode and sixth switching tube K6Is connected to B2Point; fifth power diode D5The cathode of the phase-B winding is connected with the input port of the positive pole of the phase-B winding and the drive circuit (6); sixth power diode D6Anode and sixth switching tube K6The emitter phase of the transformer is connected with the B-phase winding and the negative electrode port of the driving circuit (6).
The C-phase winding and driving circuit (7) comprises a seventh switching tube K7The eighth switching tube K8Seventh power diode D7Eighth power diode D8And a switched reluctance motor C phase winding; seventh switching tube K7The collector of the switch reluctance motor is connected with the bus input port of the switch reluctance motor and the drive power converter thereof at a point B, and a seventh switch tube K7Emitter and C-phase winding L of switched reluctance motorCOne end of (1), an eighth power diode D8Is connected to C1Point; c-phase winding L of switched reluctance motorCAnother terminal of (1), a seventh power diode D7Anode and eighth switching tube K8Is connected to C2Point; seventh power diode D7The cathode of the phase-C winding is connected with the input port of the positive pole of the C-phase winding and the drive circuit (7); eighth power diode D8Anode of and eighth switching tube K8The emitter is connected with the C-phase winding and the driverA negative port of the circuit (7).
The single-phase alternating current charging power supply is formed by serially connecting a single-phase alternating current power supply AC and a contact switch SW, and two ports of the single-phase alternating current charging power supply are respectively connected with two single-phase alternating current power supply input ports of the switched reluctance motor and the driving power converter thereof.
Fig. 2 is a schematic diagram of the open-loop voltage-regulating and speed-regulating control of the integrated drive power converter according to the present invention. Under the open-loop drive control of the rotating speed of the switched reluctance motor, the voltage and speed regulation control of the switched reluctance motor is realized, and the speed regulation control algorithm and the drive control algorithm of the switched reluctance motor are decoupled, and the method specifically comprises the following steps:
step A, the DC-DC converter realizes the output voltage UIThe automatic regulation control comprises the following specific steps:
step A-1, under the open-loop driving control mode of the rotating speed of the switched reluctance motor, rotating a rotating handle or stepping on an accelerator to provide a voltage value u corresponding to the actual rotating speed to a control system;
step A-2, sampling by the control system AD and converting into a rotating speed reference value n corresponding to the voltage uref；
Step A-3, looking up a relation curve table of the rotating speed n and the duty ratio D of the switching tube and a rotating speed reference value nrefOutputting the corresponding duty ratio D of the switching tube;
step A-4, modulating and outputting a first switching tube K in the DC-DC converter through a PWM controller1And a second switching tube K2Switch trigger signal S1And S2Realizing the output voltage U of the DC-DC converterIFollowing the automatic adjustment of the voltage value u.
And step B, the switched reluctance motor and the driving power converter thereof realize driving control by adopting the traditional angle position control and chopper control, and the specific steps are as follows:
b-1, outputting conduction interval signals A up, A down, B up, B down, C up and C down of upper and lower loops of bridge arms of each phase through an angle controller;
step B-2, the conduction interval signal and the chopping controller are realizedThe limited amplitude phase of each phase current is AND-ed, and the switch trigger signal S of the switch tube of each phase bridge arm of the switched reluctance motor is output simultaneously3～S8And the drive control of the switched reluctance motor and the drive power converter thereof is realized.
Under the open-loop voltage and speed regulating mode of the integrated driving power converter, the open-loop speed regulating function is transferred from the switched reluctance motor and the driving power converter thereof to the DC-DC converter and passes through a first switching tube K of the DC-DC converter1And a second switching tube K2PWM action of realizing output voltage UIThe automatic adjustment following the actual rotating speed avoids the third to eighth switching tubes K of the switch reluctance motor and the driving power converter of each phase3～K8The high-frequency switching action during speed regulation reduces power loss, and meanwhile, the speed regulation control of the switched reluctance motor is decoupled from the phase drive control algorithm of the switched reluctance motor, so that the flexibility of the operation control of the switched reluctance motor is improved. Switched reluctance motor and bus voltage of driving power converter of switched reluctance motor is UIThe switched reluctance motor is switched off, and the follow current voltage is the negative value-U of the voltage of the storage batterySTherefore, the follow current voltage is larger than the bus voltage, the high-voltage follow current capability is provided, the winding follow current time is shortened, the opening interval is enlarged, and the torque output interval is enlarged.
Fig. 3 is a schematic diagram of the control of closed-loop voltage regulation and speed regulation of the integrated drive power converter according to the present invention. Under the closed-loop driving control of the rotating speed of the switched reluctance motor, the voltage and speed regulation control of the switched reluctance motor is realized, and the speed regulation control algorithm and the driving control algorithm of the switched reluctance motor are decoupled, and the method specifically comprises the following steps:
step C, the DC-DC converter realizes the output voltage UIThe automatic regulation control comprises the following specific steps:
step C-1, controlling digital switch logic SW in software1Is turned on and SW2Closing to realize switching from the self-open loop speed regulation control mode to the closed loop speed regulation control switching mode;
step C-2, a reference value n of the rotating speed is givenref1The deviation from the actual rotating speed n is output after the duty ratio D of the switching tube is obtained through a PI regulator;
c-3, modulating and outputting a first switching tube K in the DC-DC converter through a PWM controller1And a second switching tube K2Switch trigger signal S1And S2Realizing the output voltage U of the DC-DC converterIFollowing said given speed reference nref1Automatic adjustment of (2).
And D, the switched reluctance motor and the driving power converter thereof realize driving control by adopting the traditional angle position control and chopper control, and the specific steps are as follows:
d-1, outputting conducting interval signals A up, A down, B up, B down, C up and C down of upper and lower loops of bridge arms of each phase through an angle controller;
d-2, performing phase comparison between the conduction interval signal and the limited amplitude value of each phase of current realized by the chopper controller, and simultaneously outputting a switch trigger signal S of each phase of bridge arm switching tube of the switched reluctance motor3～S8And the drive control of the switched reluctance motor and the drive power converter thereof is realized.
Under the closed-loop voltage and speed regulating mode of the integrated driving power converter, the closed-loop speed regulating function is transferred from the switched reluctance motor and the driving power converter part thereof to the DC-DC converter part, and the first switching tube K of the DC-DC part1And a second switching tube K2PWM action of realizing output voltage UIFollowing the speed reference nref1The third to eighth switching tubes K of the switched reluctance motor and the driving power converter thereof are avoided3～K8The high-frequency switching action during speed regulation reduces power loss, and meanwhile, the speed regulation control of the switched reluctance motor is decoupled from the phase drive control algorithm of the switched reluctance motor, so that the flexibility of the operation control of the switched reluctance motor is improved. Switched reluctance motor and bus voltage of driving power converter of switched reluctance motor is UIThe turn-off follow current voltage of the switched reluctance motor is a negative value-U of the voltage of the storage batterySTherefore, the follow current voltage is larger than the bus voltage, the high-voltage follow current capability is provided, the winding follow current time is shortened, the opening interval is enlarged, and the torque output interval is enlarged.
Fig. 4 shows a control schematic diagram of open-loop and closed-loop constant-voltage speed regulation of the integrated drive power converter according to the present invention. The open-loop and closed-loop constant-pressure speed regulation control comprises the following steps:
step E, the DC-DC converter realizes the output voltage UIThe constant control method comprises the following specific steps in the open-loop and closed-loop control modes of the rotating speed of the motor:
step E-1, a voltage reference value U is givenrefAnd the actual output voltage UIThe reference current i on the energy storage inductor L is output through the PI regulatorref；
Step E-2, reference Current iref and the current i of the energy storage inductorLThe deviation between the two is output after the duty ratio D of the switching tube is obtained through a PI regulator;
e-3, modulating and outputting a first switching tube K in the DC-DC converter through a PWM controller1And a second switching tube K2Switch trigger signal S1And S2Realizing the output voltage U of the DC-DC converterIThe constant control of the switch reluctance motor and the drive power converter thereof provides constant bus voltage.
Step F, the switched reluctance motor and the driving power converter thereof adopt the traditional angle position control and chopper control to realize the driving control, and simultaneously undertake the commutation control of the motor and the rotating speed control of the motor, and the specific steps under the motor rotating speed open-loop control mode are as follows:
step F-1, controlling digital switch logic SW in software1Closed and SW2Opening the motor, and performing open loop control on the rotating speed of the motor;
step F-2, rotating the rotating handle or stepping on the accelerator to provide a voltage value u corresponding to the actual rotating speed for the control system, sampling by the control system AD and converting into a rotating speed reference value n corresponding to the voltage uref；
F-3, searching a relation curve table of the rotating speed n and the duty ratio D of the switching tube for a rotating speed reference value nrefOutputting the corresponding duty ratio D of the switching tube;
f-4, modulating and outputting a control signal by a PWM controller; outputting a conduction interval signal A, B, C of each phase bridge arm loop through the angle controller;
f-5, performing phase comparison on the PWM control signal and the conduction interval signal to obtain a third switching tube K in the three-phase bridge arm loop of the switched reluctance motor and the driving power converter thereof3The fifth switch tube K5And a seventh switching tube K7On the conduction interval signals a, B and C;
f-6, directly taking the conduction interval signal as a fourth switch tube K in the three-phase bridge arm loop of the switched reluctance motor and the driving power converter thereof4And a sixth switching tube K6And an eighth switching tube K8Corresponding conduction interval signals A, B and C are lower;
f-7, performing phase comparison on the conduction interval signal and the limited amplitude value phase current realized by the chopper controller, and simultaneously outputting a switch trigger signal S of the switching tube of the bridge arm of each phase of the switched reluctance motor3～S8And the drive control of the switched reluctance motor and the drive power converter thereof is realized.
Under the open-loop constant-voltage speed regulation mode of the integrated driving power converter, the DC-DC converter mainly realizes the constant control of the bus voltage of the switched reluctance motor and the driving power converter thereof; the mutual coupling of the commutation control of the motor and the open-loop control of the rotating speed of the motor is realized by the switched reluctance motor and the driving power converter thereof.
And G, the switched reluctance motor and the driving power converter thereof realize driving control, and simultaneously undertake phase change control of the motor and rotating speed control of the motor, and the specific steps under a motor rotating speed closed-loop control mode are as follows:
step G-1, controlling digital switch logic SW in software1Is turned on and SW2Closing, and performing motor rotating speed closed-loop control;
g-2, setting a reference value n of the rotating speedref1The deviation from the actual rotating speed n is output after the duty ratio D of the switching tube is obtained through a PI regulator;
g-3, modulating and outputting a control signal by a PWM controller; outputting a conduction interval signal A, B, C of each phase bridge arm loop through the angle controller;
g-4, performing phase comparison on the PWM control signal and the conduction interval signal to obtain a third switching tube K in the three-phase bridge arm loop of the switched reluctance motor and the driving power converter thereof3The fifth switch tube K5And a seventh switching tube K7On the conduction interval signals a, B and C;
g-5, directly taking the conduction interval signal as a fourth switch tube K in the switched reluctance motor and the three-phase bridge arm loop of the driving power converter thereof4And a sixth switching tube K6And an eighth switching tube K8Corresponding conduction interval signals A, B and C are lower;
g-6, performing phase comparison on the conduction interval signal and a chopping control signal phase obtained after the amplitude of each phase of current is limited and realized by the chopping controller, and simultaneously outputting a switch trigger signal S of a switching tube of each phase of bridge arm of the switched reluctance motor3～S8And the drive control of the switched reluctance motor and the drive power converter thereof is realized.
Under the closed-loop constant-voltage speed regulation mode of the integrated driving power converter, the DC-DC converter mainly realizes the constant control of the bus voltage of the switched reluctance motor and the driving power converter thereof, and the mutual coupling of the commutation control of the motor and the closed-loop control of the rotating speed of the motor is realized by the switched reluctance motor and the driving power converter thereof.
In the current afterflow stage of the turn-off interval, the afterflow voltage is the negative value-U of the voltage of the storage batterySTherefore, the absolute value of the follow current voltage is larger than the bus voltage, the high-voltage follow current capability is provided, the winding follow current time is shortened, the opening interval is enlarged, and the torque output interval is enlarged.
Fig. 5 is a schematic diagram of a charging mode motor fixing position and motor winding integration method according to the present invention. In a constant-voltage charging mode, in order to construct an integrated vehicle-mounted charger topology, a two-phase winding of a motor is used as a filter inductor of the vehicle-mounted charger topology, so that a power inductor with an externally increased volume is avoided. The invention provides that in a charging mode, the C phase of the motor is switched on, the rotor of the motor is rotated to the position where the teeth and the poles of the C phase stator and the rotor are aligned, and then the rotating shaft is fixed by using a brake device, so that the rotation of the motor caused by the electrification of a winding during charging is avoided. When the C-phase stator and the rotor are aligned, the A-phase winding and the B-phase winding have equal inductance and are positioned in the bottom area of the inductance, and the inductance saturation influence can be ignored, so that the change of inductance inductive reactance caused by large charging current is avoided, and the influence on a charger control system is reduced. Under the conditions that the motor rotating shaft is fixed, the A-phase winding inductance and the B-phase winding inductance are equal and the influence of inductance saturation is avoided, the A-phase winding inductance and the B-phase winding inductance can be used as the filter inductance of the integrated vehicle-mounted charger.
When the vehicle-mounted integrated charger is in a constant-voltage charging mode, the control system controls the switched reluctance motor to be static, the motor rotor is fixed at the tooth pole alignment position of the C-phase stator rotor, so that the inductances of the A-phase winding and the B-phase winding are equal, the influence of inductance saturation on the inductances of the A-phase winding and the B-phase winding at the position is avoided, and the A-phase winding and the B-phase winding are used as input filter inductances of the single-phase vehicle-mounted integrated charger, so that the hardware integration of the motor body and the vehicle-.
When in the constant voltage charging mode, the control system controls a first switching tube K in the DC-DC converter (2)1A second switch tube K2A first power diode D1A second power diode D2Are all cut off, control the switched reluctance motor and a third switching tube K in a driving power converter (3) thereof3The fifth switch tube K5Seventh switching tube K7The eighth switching tube K8Seventh power diode D7Eighth power diode D8All cutoff; controlling the contact switch SW to close; realize single-phase on-vehicle integrated charger topological structure.
The single-phase vehicle-mounted integrated charger comprises a direct-current storage battery (1) and an input filter capacitor C in a DC-DC converter (2)1Switched reluctance motor, A-phase winding of driving power converter (3) of switched reluctance motor, and A-phase winding L of driving circuitAAnd a fourth switching tube K4A third power diode D3A fourth power diode D4Switched reluctance motor, B-phase winding of driving power converter (3) of switched reluctance motor, and B-phase winding L in driving circuitBAnd a sixth switching tube K6A fifth power diode D5A sixth power diodeD6And a single-phase alternating current charging power supply (4); positive pole of DC accumulator and input filter capacitor C1Anode of (2), third power diode D3Cathode of (2), fifth power diode D5The cathode of the anode is connected; negative pole of DC accumulator and input filter capacitor C1Negative electrode and fourth switching tube K4Emitter electrode of, sixth switching tube K6Emitter of (2), fourth power diode D4Anode of (2), sixth power diode D6The anode of the anode is connected; third power diode D3Anode of (2) and phase-A winding LAOne end of, a fourth switching tube K4Is connected to A2Point, fifth power diode D5Anode of and B phase winding LBOne end of (1), a sixth switching tube K6Is connected to B2Point; fourth power diode D4Cathode of (2) and A-phase winding LAThe other end of the single-phase alternating current charging power supply is connected with the A1Point; sixth power diode D6Cathode of and B phase winding LBThe other end of the single-phase alternating current charging power supply is connected with the other end of the B1And (4) point.
In the charging mode, single-phase alternating current introduced by the charging interface passes through an A-phase winding L in the switched reluctance motorAphase-A winding drive circuit, phase-B winding drive circuit, and phase-B winding LBThe electric energy is sent to two ends of the storage battery through the A-phase winding driving circuit and the B-phase winding driving circuit, the output voltage is stably controlled by setting the output voltage and utilizing the single-period voltage closed-loop control, and the direct-current storage battery is charged at constant voltage.
Fig. 6 shows a method for constructing an integrated vehicle charger integrated with a motor winding inductor according to the present invention and a control schematic diagram thereof. When the motor is fixed according to the position shown in figure 5, the winding inductance L of the A phase and the B phase of the motor is adjustedAAnd LBThe method is used as a filter inductor of the integrated vehicle-mounted charger, utilizes the switched reluctance motor to integrate and drive components such as a switching tube, a power diode, a capacitor and the like in the topological structure of the power converter, and constructs the circuit topology of the integrated vehicle-mounted charger, and comprises the following steps:
step H, when the motor winding is fixed at the charging position, constructing an integrated vehicle-mounted charger topological structure, and specifically comprising the following steps:
step H-1, closing a contact switch SW, and connecting a single-phase alternating current power supply AC into a charging system for power supply;
step H-2, the control system controls a first switch tube K in the DC-DC converter (2)1A second switch tube K2A first power diode D1A second power diode D2Are all cut off, control the switched reluctance motor and a third switching tube K in a driving power converter (3) thereof3The fifth switch tube K5Seventh switching tube K7The eighth switching tube K8Seventh power diode D7Eighth power diode D8All cutoff; controlling the contact switch SW to close; realizing a single-phase vehicle-mounted integrated charger topological structure;
step I, the integrated vehicle-mounted charger control steps are as follows:
step I-1, a charging voltage reference value U of the storage battery is givenrefCharging voltage U of the accumulatorsAnd a reference voltage UrefThe deviation between them, the current reference value I is output through the PI regulatorkAnd obtaining an integration signal I by an integrator2；
Step I-2, comparing the current reference value IkWith current I of the motor windingLObtaining a deviation signal I1；
Step I-3, when integrating the signal I2Greater than the deviation signal I1When the comparator outputs a high level, the RS trigger is reset, the output level of the Q end is changed from high to low, and the output level of the Q non-end is changed from low to high, so that the integrator is reset and locked;
in the step I-4, the output level of the Q end is changed from high to low, so that the fourth switching tube K4And a sixth switching tube K6Closing at the same time;
step I-5, when the CLOCK signal CLOCK pulse arrives next time, the next period is entered, the output level of the Q end is changed from low to high, and the fourth switch tube K is enabled to be connected with the output voltage of the Q end4And a sixth switching tube K6Simultaneously opening; the Q non-end output level changes from high to low,the integrator starts to operate.
By adopting the topological structure mode of the integrated vehicle-mounted charger, any power switch tube, power diode and high-power large-volume inductance device are not added, the topological structure of the motor is unchanged, the volume of a motor system is unchanged, the manufacturing cost of the motor is unchanged, and the light and intelligent motor driving system of the electric automobile is facilitated. The integrated vehicle-mounted charger operates in a mode that the primary current is controlled in each switching period, so that not only is the real-time control of the bus voltage realized, but also the charging current and the alternating voltage are in the same phase, and the power factor is corrected in real time.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. Electric automobile switched reluctance motor integrated drive power converter which characterized in that: the system comprises a direct-current storage battery (1), a DC-DC converter (2), a switched reluctance motor and a driving power converter (3) thereof and a single-phase alternating-current charging power supply (4);
the DC-DC converter is provided with an anode input port, an anode output port and a cathode port; the switched reluctance motor and the driving power converter thereof are provided with a bus input port, a positive input port, a negative port and two single-phase alternating-current power input ports;
the positive pole of the direct current storage battery (1) is connected with the positive pole input port of the DC-DC converter (2) and the positive pole input port of the switch reluctance motor and the drive power converter (3) thereof, the negative pole of the direct current storage battery (1) is connected with the negative pole port of the DC-DC converter (2) and the negative pole port of the switch reluctance motor and the drive power converter (3) thereof, the bus input port of the switch reluctance motor and the drive power converter (3) thereof is connected with the positive pole output port of the DC-DC converter (2), and the single-phase alternating current charging power supply (4) is connected with the two alternating current single-phase power supply input ports of the switch reluctance motor and the drive power converter (3) thereof;
the DC-DC converter comprises a first switch tube, a second switch tube, a first power diode, a second power diode, an input filter capacitor, an output filter capacitor and an energy storage inductor;
the collector of the first switch tube, the cathode of the first power diode and the positive end of the input filter capacitor are connected with the positive input port of the DC-DC converter (2), the emitter of the first switch tube, the collector of the second switch tube, the anode of the first power diode, the cathode of the second power diode and one end of the energy storage inductor are connected with the point A, the emitter of the second switch tube, the anode of the second power diode, the negative end of the input filter capacitor and the negative end of the output filter capacitor are connected with the negative port of the DC-DC converter (2); the positive end of the output filter capacitor is connected with the other end of the energy storage inductor at a point B, and the point B is connected with the positive output port of the DC-DC converter (2);
the switched reluctance motor and the driving power converter thereof comprise an A-phase winding and driving circuit (5), a B-phase winding and driving circuit (6) and a C-phase winding and driving circuit (7); the phase-A winding and driving circuit and the phase-B winding and driving circuit are respectively provided with a bus input port, an anode input port, a cathode port and a single-phase alternating-current power supply input port, and the phase-C winding and driving circuit is provided with a bus input port, an anode input port and a cathode port;
the bus input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the bus input port of the switched reluctance motor and the driving power converter thereof, the positive input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the positive input port of the switched reluctance motor and the driving power converter thereof, the negative ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit, the C-phase winding and driving circuit are connected with the negative port of the switched reluctance motor and the driving power converter thereof, and the single-phase alternating current power input ports of the A-phase winding and driving circuit, the B-phase winding and driving circuit are respectively connected with the two ends of the single-phase alternating current;
the A-phase winding and driving circuit (5) comprises a third switching tube, a fourth switching tube, a third power diode, a fourth power diode and a switched reluctance motor A-phase winding; the collector of the third switch tube is connected with the input port of the bus of the switched reluctance motor and the drive power converter thereof at the point B, the emitter of the third switch tube, one end of the A-phase winding of the switched reluctance motor and the cathode of the fourth power diode are connected with the A1A point, and A1The point is connected with the A-phase winding and one input port of a single-phase alternating current power supply of the driving circuit (5); the other end of the A-phase winding of the switched reluctance motor, the anode of the third power diode and the collector of the fourth switching tube are connected with the A phase2Point; the cathode of the third power diode is connected with the A-phase winding and the positive input port of the driving circuit (5); the anode of the fourth power diode and the emitter of the fourth switching tube are connected to the A-phase winding and the negative port of the driving circuit (5);
the B-phase winding and driving circuit (6) comprises a fifth switching tube, a sixth switching tube, a fifth power diode, a sixth power diode and a switched reluctance motor B-phase winding; the collector of the fifth switch tube is connected with the input port of the bus of the switch reluctance motor and the drive power converter thereof at the point B, the emitter of the fifth switch tube, one end of the B-phase winding of the switch reluctance motor and the cathode of the sixth power diode are connected with the point B1A dot, and B1The point is connected with the other input port of the single-phase alternating current power supply of the B-phase winding and the driving circuit (6); the other end of the B-phase winding of the switched reluctance motor, the anode of the fifth power diode and the collector of the sixth switching tube are connected with the B phase2Point; the cathode of the fifth power diode is connected with the B-phase winding and the positive input port of the driving circuit (6); the anode of the sixth power diode and the emitter of the sixth switching tube are connected to the B-phase winding and the negative port of the driving circuit (6);
the C-phase winding and driving circuit (7) comprises a seventh switching tube, an eighth switching tube, a seventh power diode, an eighth power diode and a switched reluctance motor C-phase winding; collector and switch magnet of seventh switch tubeThe resistance motor and the bus input port of the driving power converter are connected to the point B, the emitter of the seventh switch tube, one end of the C-phase winding of the switched reluctance motor and the cathode of the eighth power diode are connected to the point C1Point; the other end of the C-phase winding of the switched reluctance motor, the anode of the seventh power diode and the collector of the eighth switching tube are connected with the C2Point; the cathode of the seventh power diode is connected with the C-phase winding and the positive input port of the driving circuit (7); the anode of the eighth power diode and the emitter of the eighth switching tube are connected to the negative port of the C-phase winding and the driving circuit (7);
the bus input port of the switched reluctance motor and the bus input port of the driving power converter of the switched reluctance motor are connected with the positive output port of the DC-DC converter at a point B, and the bus voltage of the switched reluctance motor and the driving power converter of the switched reluctance motor is the output voltage of the DC-DC converter;
the turn-off freewheeling circuit for the A-phase winding includes: the phase A winding, the third power diode, the direct-current storage battery and the fourth power diode; the turn-off freewheeling circuit for the B-phase winding includes: the phase B winding, the fifth power diode, the direct-current storage battery and the sixth power diode; the turn-off freewheeling circuit for the C-phase winding includes: the phase C winding, the seventh power diode, the direct-current storage battery and the eighth power diode; the turn-off follow current voltage of each phase winding is the voltage of the storage battery;
the voltage of the storage battery is larger than the output voltage of the DC-DC converter, and the turn-off follow current voltage of each phase winding is larger than the bus voltage of the switched reluctance motor and the driving power converter thereof.
2. The switched reluctance motor integrated drive power converter of claim 1, wherein: the single-phase alternating current charging power supply is formed by serially connecting a single-phase alternating current power supply AC and a contact switch SW, and two ports of the single-phase alternating current charging power supply are respectively connected with two single-phase alternating current power supply input ports of the switched reluctance motor and the driving power converter thereof.
3. A control method of an integrated drive power converter of a switched reluctance motor of an electric vehicle is realized by the integrated drive power converter of the switched reluctance motor according to claim 1, and is characterized in that: the voltage PWM duty ratio matched with the rotating speed is adopted to determine the states of a first switching tube and a second switching tube in the DC-DC converter, so that the voltage regulation and speed regulation control and the constant voltage speed regulation control of the switched reluctance motor are realized.
4. The control method of the integrated drive power converter of the switched reluctance motor of the electric vehicle according to claim 3, wherein: under the open-loop drive control of the rotating speed of the switched reluctance motor, the voltage and speed regulation control of the switched reluctance motor is realized, and the speed regulation control algorithm and the drive control algorithm of the switched reluctance motor are decoupled, wherein the specific control algorithm is as follows:
A1. the speed regulation control algorithm of the switched reluctance motor is as follows: the PWM controller is adopted to adjust the switching states of a first switching tube and a second switching tube in the DC-DC converter according to the duty ratio parameter matched with the actual rotating speed of the switched reluctance motor, so that the output voltage U of the DC-DC converter is realizedIAt 0 to the battery voltage USAutomatic control which changes and is matched with the actual rotating speed;
A2. the drive control algorithm of the switched reluctance motor is as follows: the control of the third to eighth switching tubes of each phase of the power converter can be realized by adopting an angle position control and chopping control mode, so that each phase of the motor is driven;
under the closed-loop driving control of the rotating speed of the switched reluctance motor, the voltage and speed regulation control of the switched reluctance motor is realized, and the speed regulation control algorithm and the driving control algorithm of the switched reluctance motor are decoupled, wherein the specific control algorithm is as follows:
B1. the speed regulation control algorithm of the switched reluctance motor is as follows: the PWM controller is adopted to adjust the switching states of a first switching tube and a second switching tube in the DC-DC converter, so that the output voltage U of the DC-DC converter is realizedIAt 0 to the battery voltage USAutomatic control which changes between the given rotating speeds and follows the given rotating speed;
B2. the drive control algorithm of the switched reluctance motor is as follows: by adopting the angle position control and chopping control modes, the control of the third to eighth switching tubes of each phase of the power converter can be realized, so that each phase of the motor is driven.
5. The control method of the integrated drive power converter of the switched reluctance motor of the electric vehicle according to claim 3, wherein: under the open-loop driving control of the rotating speed of the switched reluctance motor, the constant-voltage speed regulation control of the switched reluctance motor is realized, and the specific control algorithm is as follows:
C1. the method comprises the steps of giving an output voltage reference value of the DC-DC converter, controlling the deviation between actual output voltage and given voltage through a PI regulator to obtain an energy storage inductive current reference value, controlling the deviation between actual current of an energy storage inductor and the energy storage inductive current reference value through the PI regulator to obtain the duty ratio of a first switching tube and a second switching tube, and accordingly achieving the U-DC output voltageIThe voltage stabilization of (3);
C2. in the presence of UIUnder the condition of bus voltage input, the switched reluctance motor can realize open-loop speed regulation control in an angle position control mode and a chopping control mode; the method specifically comprises the following steps:
C21. controlling digital switch logic SW1Closed and SW2Opening the motor, and performing open loop control on the rotating speed of the motor;
C22. the rotating handle or the stepping accelerator provides a voltage value u corresponding to the actual rotating speed for the control system, and the voltage value u is sampled and converted into a rotating speed reference value n corresponding to the voltage u by the control system ADref；
C23. Looking up a relation curve table of the rotating speed n and the duty ratio D of the switching tube and a rotating speed reference value nrefOutputting the corresponding duty ratio D of the switching tube;
C24. modulating an output control signal by a PWM controller; outputting a conduction interval signal A, B, C of each phase bridge arm loop through the angle controller;
C25. and the PWM control signal and the conduction interval signal are subjected to phase comparison to obtain a third switching tube K in the switched reluctance motor and the three-phase bridge arm loop of the driving power converter of the switched reluctance motor3The fifth switch tube K5And a seventh switching tube K7On the conduction interval signals a, B and C;
C26. the conducting regionIntermediate signal directly used as switch reluctance motor and fourth switch tube K in three-phase bridge arm loop of driving power converter of switch reluctance motor4And a sixth switching tube K6And an eighth switching tube K8Corresponding conduction interval signals A, B and C are lower;
C27. the conducting interval signal is subjected to phase addition with the limited amplitude value of each phase current realized by the chopper controller, and a switch trigger signal S of each phase bridge arm switching tube of the switched reluctance motor is output simultaneously3～S8The drive control of the switched reluctance motor and the drive power converter thereof is realized;
under the closed-loop driving control of the rotating speed of the switched reluctance motor, the specific control algorithm is as follows:
D1. the method comprises the steps of giving an output voltage reference value of the DC-DC converter, controlling the deviation between actual output voltage and given voltage through a PI regulator to obtain an energy storage inductive current reference value, controlling the deviation between actual current of an energy storage inductor and the energy storage inductive current reference value through the PI regulator to obtain the duty ratio of a first switching tube and a second switching tube, and accordingly achieving the U-DC output voltageIThe voltage stabilization of (3);
D2. the drive control algorithm of the switched reluctance motor is as follows: at a set speed reference nref1Then, the actual rotation speed n and the reference rotation speed n are adjusted through PIref1And the conduction interval signals obtained by the angle controller are directly used as control signals corresponding to a fourth switching tube, a sixth switching tube and an eighth switching tube of the three bridge arms of the switched reluctance motor driving power converter, and the PWM control signals and the lower tube control signals are simultaneously subjected to AND operation with the control signals output by the current hysteresis chopping in consideration of starting current limitation and protection, so that actual control signals of the upper tube and the lower tube of the switched reluctance motor driving power converter are obtained.
6. The control method of the integrated drive power converter of the switched reluctance motor of the electric vehicle according to claim 3, wherein: when the switching reluctance motor is in a constant voltage charging mode, the control system controls the C phase of the switching reluctance motor to be switched on and controls the rotating shaft of the motor to be fixed; the motor rotating shaft is fixed, namely a motor rotor is fixed at the tooth pole alignment position of the C-phase fixed rotor, and then the rotating shaft is fixed by using a brake device;
in the mode of fixing the rotating shaft of the motor, the A-phase winding and the B-phase winding of the motor have equal inductance and avoid the influence of inductance saturation; in the mode of fixing the rotating shaft of the motor, the phase A winding and the phase B winding of the motor are used as input filter inductors of the single-phase vehicle-mounted integrated charger;
when the constant-voltage charging mode is adopted, the control system controls a first switching tube, a second switching tube, a first power diode and a second power diode in the DC-DC converter (2) to be all cut off, and controls a switched reluctance motor and a third switching tube, a fifth switching tube, a seventh switching tube, an eighth switching tube, a seventh power diode and an eighth power diode in a driving power converter (3) to be all cut off; controlling the contact switch SW to close; realizing a single-phase vehicle-mounted integrated charger topological structure;
the single-phase vehicle-mounted integrated charger comprises a direct-current storage battery (1), an input filter capacitor in a DC-DC converter (2), a switched reluctance motor, an A-phase winding of a driving power converter (3) of the switched reluctance motor, an A-phase winding of a driving circuit of the switched reluctance motor, a fourth switching tube, a third power diode and a fourth power diode, a B-phase winding of the switched reluctance motor, a B-phase winding of the driving power converter (3) of the switched reluctance motor, a B-phase winding of the driving circuit of the switched reluctance motor, a sixth switching tube, a fifth power diode and a sixth power diode, and a single-phase alternating-current charging power supply (4); the positive electrode of the direct-current storage battery is connected with the positive electrode of the input filter capacitor, the negative electrode of the third power diode and the negative electrode of the fifth power diode; the negative electrode of the direct-current storage battery is connected with the negative electrode of the input filter capacitor, the emitter of the fourth switching tube, the emitter of the sixth switching tube, the anode of the fourth power diode and the anode of the sixth power diode; the anode of the third power diode is connected with one end of the A-phase winding and the collector of the fourth switch tube to A2Point, anode of fifth power diode, one end of B phase winding, and sixth power diodeThe collector of the switch tube is connected with B2Point; the cathode of the fourth power diode, the other end of the A-phase winding and one end of the single-phase alternating-current charging power supply are connected with the A1Point; the cathode of the sixth power diode is connected with the other end of the B-phase winding and the other end of the single-phase alternating-current charging power supply to the B1Point;
in the charging mode, single-phase alternating current introduced by the charging interface passes through an A-phase winding, an A-phase winding driving circuit, a B-phase winding driving circuit and a B-phase winding in the switched reluctance motor, and electric energy is transmitted to two ends of the storage battery through the A-phase winding driving circuit and the B-phase winding driving circuit to charge the battery.
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