CN113844296A - Electric automobile integrated charger based on double three-phase motors and control method thereof - Google Patents
Electric automobile integrated charger based on double three-phase motors and control method thereof Download PDFInfo
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- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/24—Using the vehicle's propulsion converter for charging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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- B60L2220/18—Reluctance machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/50—Structural details of electrical machines
- B60L2220/54—Windings for different functions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/50—Structural details of electrical machines
- B60L2220/58—Structural details of electrical machines with more than three phases
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Abstract
The invention relates to a permanent magnet motor technology, and aims to provide an electric automobile integrated charger based on a double three-phase motor and a control method thereof. The invention adopts a double three-phase open winding permanent magnet motor, two ends of a stator winding of the permanent magnet motor are opened and led out of a stator shell, and the stator winding is respectively connected with an alternating current input power supply and a motor converter through a mode switch; the mode switch is used as an electric automobile charging circuit inductor by reconstructing a winding of the double three-phase open winding permanent magnet motor, so that a motor rotor is kept static during charging; the motor windings are multiplexed as an ac side filter inductor during charging, and together with the motor converter form a rectifier circuit. The invention can realize the flexible switching between the charging state and the driving state, thereby saving the hardware cost of the electric automobile; the reconstruction mode is based on the original hardware condition, the scheme is simple, and the universality is strong. Compared with the traditional voltage outer ring-current inner ring current feedforward decoupling control, the current dynamic response is fast; circuit parameters are not used in control operation, and the robustness of the system is good.
Description
Technical Field
The invention relates to a permanent magnet motor technology, in particular to an electric automobile integrated charger based on a double three-phase motor and a control method thereof, and belongs to the technical field of electricity.
Background
With the progress of society, people pay more attention to a sustainable development mode of green, low carbon and environmental protection. In recent years, the global development trend gradually changes to green and low-carbon development. Compared with the traditional fuel vehicle, the electric vehicle has paid attention to researchers due to the characteristics of environmental protection and energy conservation, and the research on the electric vehicle is on the rise. The charging power of the existing vehicle-mounted alternating current charging system is generally low, and the size of the charging equipment is large due to device redundancy, so that the charging equipment is not beneficial to the development of electric automobiles. In order to overcome the above problems, a high power density integrated vehicle ac charging system is gradually becoming a big hot spot.
The integrated vehicle-mounted alternating current charging system adopts an integrated scheme of multiplexing a motor winding and a converter, and in a charging mode, the motor winding of the electric vehicle is used as an energy storage filter inductor in a winding reconstruction mode to form a rectifier together with the motor converter. The reconstruction mode converts the original electric automobile driving system into a charging system on the basis of not increasing extra hardware, so that the cost is effectively saved while the charging power of the electric automobile is improved.
According to different types of input power supplies, the integrated charging system can be divided into a single-phase alternating-current charging system and a three-phase alternating-current charging system, and the reconstructed motor comprises a three-phase permanent magnet motor and a multi-phase permanent magnet motor. The multiphase permanent magnet motor is gradually and widely adopted by an integrated charging system due to the characteristics of small torque pulsation, strong fault-tolerant operation capability and more reusable winding phases. However, the current winding reconfiguration mode for the multi-phase motor is complex, so that the system has poor universality in different charging modes. In addition, the traditional current feedforward decoupling control mode is mostly adopted in the aspect of control, and the problems of control delay and poor dynamic response exist when the system operates in a single-phase integrated charging state; when the system runs in a three-phase integrated charging system, the parameter difference of the filter inductance at the alternating current side needs to be ignored for application, and the control parameter setting is difficult due to the simultaneous existence of a plurality of PI controllers.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides an electric automobile integrated charger based on a double three-phase motor and a control method thereof.
In order to solve the technical problem, the solution of the invention is as follows:
the main circuit of the charger comprises a single-phase/three-phase alternating-current input power supply, a double three-phase permanent magnet motor, a motor converter, a direct-current side capacitor and a storage battery; the double three-phase permanent magnet motor is a double three-phase open winding permanent magnet motor, two ends of a stator winding of the double three-phase open winding permanent magnet motor are opened and led out of a stator shell, and the double three-phase open winding permanent magnet motor is respectively connected with an alternating current input power supply and a motor converter through a mode switch; the mode switch is used as an electric automobile charging circuit inductor by reconstructing a winding of the double three-phase open winding permanent magnet motor, so that a motor rotor is kept static during charging; the motor windings are multiplexed into an alternating current side filter inductor during charging, and form a rectifying circuit together with the motor converter.
Preferably, a dual three-phase motor topology is reconstructed by the mode switch to form a single-phase integrated charger and a three-phase integrated charger, and the single-phase integrated charger and the three-phase integrated charger are used for switching between a single-phase charging scheme and a three-phase charging scheme.
Preferably, for a charging topology of single-phase alternating-current power input, the number N of the phases of the double three-phase permanent magnet motor is recorded as 6, and the serial number of any phase winding of the double three-phase permanent magnet motor is selected and recorded as N0The serial numbers of the other phase windings are N in turn in the anticlockwise direction1， N2，…，N5(ii) a Three windings N0、N2、N4Classified as group A, N1、N3、N5Grouping into B groups, wherein three windings of each group are mutually different by 120 degrees; the dotted terminal of each group of windingsAnd one end of the connected winding is connected with any one of three-phase alternating current power supplies, the other end of the connected winding is connected with a motor converter to jointly form a single-phase rectification circuit, and a motor rotor is in a static state during charging.
Preferably, for a charging topology input by a three-phase alternating-current power supply, the number N of the phases of the double three-phase permanent magnet motor is recorded as 6, and the serial number of any phase winding of the double three-phase permanent magnet motor is selected and recorded as N0The serial numbers of the other phase windings are N in turn in the anticlockwise direction1， N2，…，N5(ii) a Note N is 3m, winding NiAnd winding N4m-1-iThe ends with the same name are connected or end to end; the connected windings are divided into three groups, one end of each group of windings is connected with one phase of a three-phase alternating current power supply, the other end of each group of windings is connected with a motor converter, a three-phase rectification circuit is formed in the group, and a motor rotor is in a static state during charging.
The invention further improves the control method of the electric automobile integrated charger based on the double three-phase motors, in the charging mode, the mode switch is closed, the alternating current input power supply is connected with the motor converter through the winding reconstruction, at the moment, the winding of the motor is reused as the filter inductor, the winding and the motor converter jointly form a rectifying circuit, and the alternating current input power supply charges the storage battery; in a driving mode, the mode switch is disconnected, the connection between the alternating current input power supply and the motor converter is disconnected, the double three-phase motor operates as a motor, the converter works in an inversion state at the moment, and the storage battery supplies power to the double three-phase motor.
As a preferred scheme, in a charging mode, a motor converter and a motor winding jointly form a PWM rectifier; each phase of bridge arm of the motor converter is independently controlled through a phase current direct tracking control strategy, and the control strategy is simultaneously suitable for two charging schemes of single-phase integrated charging and three-phase integrated charging.
Description of the inventive principles:
the double three-phase permanent magnet motor is a permanent magnet motor with a stator composed of two sets of Y-shaped connected three-phase symmetrical windings, has the characteristics of high power density, small pulsation torque, strong fault-tolerant capability and multiple reusable winding phases, and is usually used for a high-power high-reliability cross-flow transmission system. The invention applies a double three-phase motor to a high-power density integrated vehicle-mounted alternating current charging system, improves the double three-phase permanent magnet motor, opens two ends of a stator winding of the double three-phase permanent magnet motor and leads the stator winding out of a stator shell to form the double three-phase open winding permanent magnet motor, and is respectively connected with an alternating current input power supply and a motor converter through a mode switch; the motor windings are multiplexed as an ac side filter inductor during charging, and together with the motor converter form a rectifier circuit. The invention adopts a winding reconstruction scheme aiming at a double three-phase motor, directly controls the mode switch to reconstruct the topology of the double three-phase motor, and respectively forms a single-phase integrated charger and a three-phase integrated charger according to different input power types, thereby realizing the flexible switching of the two schemes of single-phase charging and three-phase charging. Aiming at two charging modes, the invention designs a direct tracking control strategy of phase current, under the control of the same voltage outer ring, the amplitude and the phase of each winding current which is connected with the same phase power supply in parallel are the same by independently controlling each phase bridge arm current of the double three-phase motor, the static state of a rotor and the control of unit power factor are realized on the premise of meeting the reconstruction of the winding, and the control method is simultaneously suitable for single-phase and three-phase integrated charging topologies. After the treatment, the characteristics of high power density and reusability of windings of the double three-phase motor are fully utilized to form the integrated charger suitable for single-phase and three-phase charging modes, the charging control strategy is simple, and the applicability is strong; meanwhile, an original electric vehicle driving system is converted into a charging system on the basis of not increasing extra hardware, so that the cost is effectively saved while the charging power of the electric vehicle is improved. Therefore, the defects of low power density, limited application occasions, complex control and higher cost of the original integrated charging system can be overcome.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts a double three-phase permanent magnet motor, has high power density, small pulsation torque, strong fault-tolerant capability and more reusable winding phases, and can adapt to the requirements of single-phase integrated charging and three-phase integrated charging through winding reconfiguration in structure.
(2) The invention can realize the flexible switching between the charging state and the driving state, and save the hardware cost of the electric automobile. Meanwhile, the reconstruction mode of the charger is based on the original hardware condition, the reconstruction scheme is simple, and the stillness of the motor rotor during the charging period can be effectively guaranteed.
(3) The charging control method in the charging mode can independently control each phase bridge arm of the motor converter through the direct tracking control strategy of the phase current, is simultaneously suitable for two charging schemes of single-phase integrated charging and three-phase integrated charging, and has strong universality.
(4) The direct tracking control of the phase current provided by the invention belongs to real-time control, and compared with the traditional voltage outer ring-current inner ring current feedforward decoupling control, the current dynamic response is fast, circuit parameters are not used in the control operation, and the robustness of the system is good.
Drawings
Fig. 1 is a main circuit diagram of an electric automobile integrated charger based on a double three-phase motor in the invention.
Fig. 2 is a winding number diagram of a double three-phase open-winding permanent magnet motor.
Fig. 3 is a reconstructed diagram of a winding of a dual three-phase permanent magnet motor in a single-phase ac integrated charging state.
Fig. 4 is a reconstructed diagram of a dual three-phase permanent magnet motor winding in a three-phase ac integrated charging state.
Fig. 5 is a state diagram of the charging mode and the driving mode of operation of the integrated charger.
Fig. 6 is a diagram of integrated charger phase current direct tracking control.
Detailed Description
The electric vehicle integrated charger based on the dual three-phase motor and the charging control method thereof according to the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
The invention relates to an electric automobile integrated charger based on a double three-phase motor, which has a structure shown in figure 1 and comprises a single-phase/three-phase alternating-current input power supply 1, a mode switch 2, a double three-phase permanent magnet motor 3, a motor converter 4, a direct-current side capacitor 5 and a storage battery 6. The double three-phase permanent magnet motor 3 is a double three-phase open winding motor, the original wiring terminal of a motor stator winding is kept unchanged, the neutral point of the winding is opened, the connection mode of the winding at the neutral point is changed through winding reconfiguration and the mode switch 2, and the double three-phase permanent magnet motor is directly connected with the single-phase/three-phase alternating current input power supply 1 on the input side. Under the scheme, the mode switch is used as an electric automobile charging circuit inductor by reconstructing a winding of the double three-phase open-winding permanent magnet motor, so that a motor rotor is kept static during charging; the motor windings are multiplexed as ac-side filter inductors during charging, which together with the motor converter 4 form a rectifier circuit.
The switching between the single-phase charging mode and the three-phase charging mode is based on the winding reconstruction of the double three-phase open winding permanent magnet motor. For ease of analysis, the windings of a dual three-phase open-winding permanent magnet motor are numbered as shown in fig. 2. The phase number N of the double three-phase open winding permanent magnet motor is recorded as 6, and any phase winding is selected and recorded as N0The serial numbers of the other phase windings are sequentially N in the anticlockwise direction1，N2，…，N5. The winding reconstruction method in the single-phase charging mode and the three-phase charging mode is demonstrated below.
(1) For the single-phase charging mode, the power supply 1 is a single-phase AC input power supply, and three windings N are arranged0、N2、N4Classified as group A, N1、N3、N5And the three windings in each group are 120 degrees different from each other, and the double three-phase open-winding permanent magnet motor can be equivalent to two symmetrical three-phase open-winding permanent magnet motors. The homonymous ends of the three windings in each group are connected or connected end to end in sequence, one end of the connected winding is connected with one side of a single-phase alternating current power supply, and the other end of the connected winding is connected with a motor converter.
The decoupling transformation matrix of any symmetrical winding permanent magnet motor is as follows:
wherein n is the number of motor phases, alpha is the winding space distribution angle, and alpha is 2 pi/n.
Setting the current matrix in the winding as follows:
I＝Im[cos(kωt-θ0) cos(kωt-θ1) cos(kωt-θ2)…cos(kωt-θn-1)]T
wherein, ImIs the current amplitude, k is the current harmonic order, θiThe phase of the current in the i-th phase winding.
According to the first two rows of the decoupling transformation matrix and the current matrix, the plane component of the phase current and the torque of the motor can be obtained as follows:
when in single-phase charging mode, the winding N is reconstructed through the winding0，N1，N2，…，Nn-1End to end or end to end with the same name, then theta0＝θ1＝θ2＝…θn-1Thus, the above equation can be simplified to:
according to the above formula, when in the single-phase charging mode, if the winding N is adopted0，N1，N2，…，Nn-1The reconstruction mode of end-to-end connection or end-to-end connection of the same name enables the current torque plane component I to be subjected toα＝IβAt 0, the motor does not generate electromagnetic torque, thereby achieving that the rotor of the motor is stationary during charging.
Taking group A as an example, as shown in FIG. 3, N in group A0、N2、N4Two ends are opened and led out of the motor shell, and N is added0、N2、N4The terminals with the same name are connected, and through winding reconstruction, the group A can be equivalent to a winding of a symmetrical three-phase open-winding permanent magnet synchronous motor. One end of the reconstructed winding is connected with the single-phase alternating current power supply 1, the other end of the reconstructed winding is respectively connected with three bridge arms of the motor converter 4, and the current phase of the winding meets theta0＝θ2＝θ4Thereby realizing the output torque of the motor during chargingAt 0, the rotor remains stationary. Operation of group B is the same as group a. Through winding reconstruction, the windings of the double three-phase motor and the motor converter 4 jointly form a single-phase H-bridge rectifying circuit connected in parallel, and the single-phase H-bridge rectifying circuit can be controlled according to a common method of the single-phase rectifying circuit, so that constant-voltage charging, unit power factor correction and the like are realized.
(2) For the three-phase charging mode, the power supply 1 is a three-phase alternating-current input power supply, the number of phases N of the double three-phase permanent magnet motor is recorded as 6, and the serial number of any phase winding of the double three-phase permanent magnet motor is recorded as N0The serial numbers of the other phase windings are N in turn in the anticlockwise direction1，N2，…，N5(ii) a Note N is 3m, winding NiAnd winding N4m-1-iThe same-name ends are connected or end-to-end connected, the connected windings are divided into three groups, one end of each group of windings is connected with one phase of a three-phase alternating current power supply, and the other end of each group of windings is connected with a motor converter.
The decoupling transformation matrix of the permanent magnet motor with any phase of asymmetric windings is as follows:
wherein n is the number of motor phases and beta is the winding space distribution angle.
If the positive direction of the abscissa of the orthogonal coordinate system is fixed in the middle of the front m-phase winding, which corresponds to rotating the reference coordinate system by β (m-1)/2 degrees in the counterclockwise direction, and the reference coordinate system is as shown in fig. 5, the transformation matrix is:
due to the winding NiAnd winding N4m-1-iEnd to end or end to end under the same name, then thetai＝θ4m-1-iSimilar to the derivation process in (2), the plane component I of the current torque can be obtainedα≠0，IβWhen the motor generates a pulsating magnetic field inside the motor, no starting torque is generated, and therefore the rotor of the motor is static during charging. In particular, for 4m-1-i > n-1, 4m-1-i the total number of windings should be subtracted by 3m,to m-1-i.
Winding N of double three-phase open-winding permanent magnet motor in three-phase charging mode1，N2，…，N5Two ends are opened and led out of the motor shell. As shown in FIG. 4, N0Winding and N1The homonymous ends of the windings are connected, one end of the reconstructed winding is separately connected with the phase A of the power supply 1, and the other end of the reconstructed winding is connected with a first bridge arm 4-1 and a second bridge arm 4-2 of the motor converter 4; n is a radical of2Winding and N5The homonymous ends of the windings are connected, one end of the reconstructed winding is connected with the phase B of the power supply 1, and the other end of the reconstructed winding is respectively connected with a third bridge arm 4-3 and a fourth bridge arm 4-4 of the motor converter 4; n is a radical of3Winding and N4The homonymous ends of the windings are connected, one end of the reconstructed winding is connected with the C phase of the power supply 1, the other end of the reconstructed winding is respectively connected with the fifth bridge arm 4-5 and the sixth bridge arm 4-6 of the motor converter 4, and the current phase of the winding meets theta0＝θ1，θ2＝θ5，θ3＝θ4Therefore, the output torque of the motor is zero during charging, and the rotor is kept static. The six-phase winding and the motor converter 4 jointly form a three-phase full-bridge rectification circuit, and can be controlled according to a common method of the three-phase rectification circuit, so that constant-voltage charging, unit power factor correction and the like are realized.
In the invention, the working modes of the whole electric automobile comprise a charging mode and a driving mode. In a charging mode, a mode switch is closed, an alternating current input power supply is connected with a motor converter through winding reconfiguration, at the moment, a motor winding is multiplexed into a filtering inductor, and the winding and the motor converter jointly form a rectifying circuit; in the driving mode, the mode switch is disconnected, the connection between the alternating current input power supply and the motor converter is disconnected, the double three-phase motor operates as a motor, and the converter works in an inversion state at the moment. Taking a three-phase ac power input as an example, the switching between the charging mode and the driving mode is shown in fig. 5. At the moment, the motor winding is equivalent to an energy storage inductor and a filter inductor, and forms a PWM rectifier with the motor converter 4, and the AC power supply 1 supplies power to the storage battery. Under the driving mode, the winding neutral point is switched on and off the mode switch 2, the original driving state can be recovered, the energy flow direction is opposite, the storage battery 6 supplies power for the system, and the motor is driven to run. Compared with the traditional independent system for driving and charging, the integrated charging system utilizes the motor converter 4 for charging, can very conveniently obtain higher charging power, saves an independent vehicle-mounted charging device, does not need to increase additional devices, and greatly reduces the system cost.
In consideration of the 'heterogeneity' of the integrated charging system topology, the invention designs a direct phase current tracking control strategy to independently control the current of each phase bridge arm according to the topological structure and the performance requirement of the integrated charging system, and the control scheme is suitable for the integrated charging topology with any number of phases. The scheme simultaneously considers the balance and the dynamic responsiveness of the current in the control of the integrated charging system.
The principle of the phase current direct tracking control strategy is shown in fig. 6. For the topology of the electric automobile integrated charger based on the double three-phase motor, the upper and lower switch tubes of one-phase bridge arm in the motor converter 4 control the charging and discharging of the direct-current side capacitor, so that the output current idcIncreasing or decreasing to regulate the input current on the ac side.
The control of a one-phase bridge arm is taken as an example, and the direct tracking control principle of the phase current of the integrated charger based on the double three-phase motor is introduced. The direct tracking control strategy of phase current is a double closed-loop control system, the outer loop is a direct-current voltage control loop, and the direct-current bus voltage udc ～Filtering the frequency multiplication component by a filter to obtain a stable DC voltage actual value udcd.C. voltage given signal urefAnd comparing the voltage with the actual value of the direct current voltage and sending the voltage to the PI regulator. The PLL detects the phase of the phase voltage, multiplies the phase voltage by the output of the PI regulator, and produces the result as a given value i of the phase current inner loopn *. It can be seen that in *Is the same phase as the phase power supply, its amplitude and load current idcIs proportional, therefore, in *I.e. an alternating current command signal for the charging circuit to operate at unity power factor. Then the actual sampling current inThe current set value is compared with the triangular wave after passing through a PR regulator to obtain a trigger signal required by control, and the conduction and the closing of a switching tube are controlledAnd is disconnected, thereby realizing voltage and current control.
When the electric automobile integrated charger based on the double three-phase motor operates in a single-phase integrated charging mode, six-phase windings are reconstructed into A, B two groups according to the winding reconstruction connection mode through winding reconstruction, three windings of each group are connected in parallel, and the two groups are respectively connected to the positive electrode and the negative electrode of the single-phase input power supply 1. Therefore, the winding current of each phase can be directly tracked and controlled by adopting the phase current alone, and the outer ring control of each phase is the same. The current instruction distribution link provides given values of winding currents which are mutually connected in parallel, the given values are equal to the product of the output of the PI controller and the phase of the power supply in numerical value, therefore, after the direct current tracking control, the current amplitude and the phase of each winding which is connected with the power supply in parallel are the same, the current balance condition of winding reconstruction is met, and the rotor is static and the unit power factor control is realized.
When the electric automobile integrated charger based on the double three-phase motor operates in a three-phase integrated charging mode, six-phase windings are reconstructed into three groups according to the winding reconstruction connection mode, two windings of each group are connected in parallel and are respectively connected with A, B, C phases of the three-phase input power supply 1, and at the moment, when the current of each phase winding is directly controlled by phase current, the control of the outer ring of each phase voltage is still the same. The current instruction distribution link provides given values of winding currents which are connected in parallel, and because the three-phase power supply A, B, C has phases which are different from each other by 120 degrees, the current instruction distribution link provides given values of currents which are equal in amplitude and different from each other by 120 degrees for three groups of windings which are connected in parallel, and the given values are equal to the products of the PI controller output and A, B, C phase output power supply phases respectively in value. From the foregoing analysis, it can be known that the above control manner does not depend on actual circuit parameters, the control result will strictly follow the given value, the amplitude and phase of the winding current are still the same, and the scheme is still effective for controlling the three-phase integrated charging mode.
Claims (6)
1. A kind of integrated charger of electric automobile based on double three-phase electrical machinery, the main circuit of the charger includes single-phase/three-phase AC input power, double three-phase permanent-magnet machine, electrical machinery converter, direct-flow side electric capacity and storage battery; the double three-phase permanent magnet motor is a double three-phase open winding permanent magnet motor, two ends of a stator winding of the double three-phase open winding permanent magnet motor are opened and led out of a stator shell, and the double three-phase open winding permanent magnet motor is respectively connected with an alternating current input power supply and a motor converter through a mode switch; the mode switch is used as an electric automobile charging circuit inductor by reconstructing a winding of the double three-phase open winding permanent magnet motor, so that a motor rotor is kept static during charging; the motor windings are multiplexed as an ac side filter inductor during charging, and together with the motor converter form a rectifier circuit.
2. The integrated charger of claim 1, wherein the dual three-phase topology is reconfigured with a mode switch to form a single-phase integrated charger and a three-phase integrated charger for switching between the single-phase charging scheme and the three-phase charging scheme.
3. The single-phase integrated charger according to claim 2, wherein for the charging topology of the single-phase ac power input, the number of phases N of the dual three-phase permanent magnet motor is recorded as 6, and the serial number of any phase winding of the dual three-phase motor is selected and recorded as N0The serial numbers of the other phase windings are N in turn in the anticlockwise direction1，N2，···，N5(ii) a Three windings N0、N2、N4Classified as group A, N1、N3、N5Grouping into B groups, wherein three windings of each group are mutually different by 120 degrees; the homonymous ends of each group of windings are connected or sequentially connected end to end, one end of the connected winding is connected with any one of three-phase alternating current power supplies, the other end of the connected winding is connected with a motor converter to jointly form a single-phase rectification circuit, and a motor rotor is in a static state during charging.
4. The three-phase integrated charger according to claim 2, wherein for the charging topology of the three-phase ac power input, the number of phases N of the dual three-phase permanent magnet motor is recorded as 6, and the serial number of any phase winding of the dual three-phase motor is selected and recorded as N0The serial numbers of the other phase windings are N in turn in the anticlockwise direction1，N2，···，N5(ii) a Say n is 3m, windGroup NiAnd winding N4m-1-iThe ends with the same name are connected or end to end; the connected windings are divided into three groups, one end of each group of windings is connected with one phase of a three-phase alternating current power supply, the other end of each group of windings is connected with a motor converter, a three-phase rectification circuit is formed together, and a motor rotor is in a static state during charging.
5. The method of claim 1, wherein in the charging mode, the mode switch is closed, the ac input power is connected to the motor converter through winding reconfiguration, the motor winding is reused as a filter inductor, the winding and the motor converter together form a rectifier circuit, and the ac input power charges the battery; in a driving mode, the mode switch is disconnected, the connection between the alternating current input power supply and the motor converter is disconnected, the double three-phase motor operates as a motor, the converter works in an inversion state at the moment, and the storage battery supplies power to the double three-phase motor.
6. The control method of claim 5, wherein in the charging mode, the motor converter and the motor winding together form a PWM rectifier; each phase bridge arm of the motor converter is independently controlled through a phase current direct tracking control strategy, and the control strategy is simultaneously suitable for two charging schemes of single-phase integrated charging and three-phase integrated charging.
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| CN115378103A (en) * | 2022-08-15 | 2022-11-22 | 华南理工大学 | Engineering machinery driving and charging integrated circuit based on double three-phase motors |
| CN115549529A (en) * | 2022-09-15 | 2022-12-30 | 华南理工大学 | Double three-phase motor parallel type driving and charging integrated circuit applied to electric engineering machinery |
| CN115864942A (en) * | 2023-02-20 | 2023-03-28 | 四川大学 | Online switching topology of double three-phase motor and open winding motor and control method thereof |
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Application publication date: 20211228 |