CN116238350A - Electric drive system integrating alternating-current charging and discharging and electric vehicle - Google Patents

Electric drive system integrating alternating-current charging and discharging and electric vehicle Download PDF

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Publication number
CN116238350A
CN116238350A CN202310373563.4A CN202310373563A CN116238350A CN 116238350 A CN116238350 A CN 116238350A CN 202310373563 A CN202310373563 A CN 202310373563A CN 116238350 A CN116238350 A CN 116238350A
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China
Prior art keywords
electric drive
power battery
power
relay
drive system
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CN202310373563.4A
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Chinese (zh)
Inventor
喻皓
夏铸亮
唐君华
胡志华
龚浩然
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GAC Aion New Energy Automobile Co Ltd
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GAC Aion New Energy Automobile Co Ltd
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Priority to CN202310373563.4A priority Critical patent/CN116238350A/en
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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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/66—Arrangements of batteries
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the application provides an integrated alternating-current charging and discharging electric drive system and an electric vehicle, and relates to the technical field of electric drive systems. In the electric drive system, an electric drive assembly comprises a first power battery, a second power battery, a three-phase inverter circuit and a drive motor, wherein the first power battery and the second power battery are connected in series, one end of the three-phase inverter circuit is connected with the first power battery, the other end of the three-phase inverter circuit is connected with the second power battery, and the drive motor is connected with the three-phase inverter circuit; the charging interface component comprises a charging interface, a first relay and a second relay, the charging interface is connected with the driving motor through the first relay, the charging interface is connected between the first power battery and the second power battery through the second relay, and the charging interface is connected with a preset alternating current power supply. The electric drive system can realize multiplexing of the electric drive unit circuit, and simultaneously realize the functions of electric drive and alternating current slow charging, thereby realizing the technical effect of reducing the cost of the whole vehicle.

Description

Electric drive system integrating alternating-current charging and discharging and electric vehicle
Technical Field
The application relates to the technical field of electric drive systems, in particular to an integrated alternating-current charging and discharging electric drive system and an electric vehicle.
Background
Currently, on the electrical architecture of a traditional electric automobile, an electric drive unit (motor+three-phase inverter) and an alternating-current slow charging machine (OBC, on Board Charger) are two independent components. The electric drive unit works in a driving state, the OBC only works when the vehicle is stopped and charged, and the OBC work in a time-sharing mode.
In the prior art, a conventional electric drive system includes a power battery, a three-phase inverter circuit, and a drive motor. Power cells are typically composed of a plurality of cells (cells) in series. The power of the electric drive unit can completely meet the requirement of single-phase alternating current slow charging, and how to reuse the electric drive unit circuit and realize the functions of electric drive and alternating current slow charging at the same time, thereby realizing the cost reduction of the whole vehicle is a problem.
Disclosure of Invention
An object of the embodiment of the application is to provide an integrated alternating-current charging and discharging electric drive system and an electric vehicle, which can realize multiplexing of an electric drive unit circuit, and simultaneously realize the functions of electric drive and alternating-current slow charging, thereby realizing the technical effect of reducing the cost of the whole vehicle.
In a first aspect, embodiments of the present application provide an integrated ac charge-discharge electric drive system, including an electric drive assembly and a charging interface assembly;
the electric driving assembly comprises a first power battery, a second power battery, a three-phase inverter circuit and a driving motor, wherein the first power battery and the second power battery are connected in series, one end of the three-phase inverter circuit is connected with the first power battery, the other end of the three-phase inverter circuit is connected with the second power battery, and the driving motor is connected with the three-phase inverter circuit;
the charging interface assembly comprises a charging interface, a first relay and a second relay, wherein the charging interface is connected with the driving motor through the first relay, the charging interface is connected between the first power battery and the second power battery through the second relay, and the charging interface is connected with a preset alternating current power supply.
In the implementation process, the charging interface component is added in the integrated alternating-current charging and discharging electric drive system, so that the preset alternating-current power supply and the charging interface are disconnected when charging is not needed; when charging is needed, connecting a preset alternating current power supply with a charging interface, connecting one end of alternating current coming from the charging interface to a neutral point of a winding of a driving motor through a first relay, connecting the other end of alternating current between a first power battery and a second power battery through a second relay, driving and controlling a three-phase inverter circuit through PWM signals to control a common mode voltage of the driving motor, and further controlling a common mode current of the driving motor, so that alternating current charging of the power battery can be realized; in addition, the integrated alternating-current charging and discharging electric drive system can also realize that the electric energy in the power battery is discharged to the outside through the charging interface; therefore, the integrated alternating-current charging and discharging electric drive system can realize multiplexing of the electric drive unit circuit, and simultaneously realize the functions of electric drive and alternating-current slow charging, thereby realizing the technical effect of reducing the cost of the whole vehicle.
Further, the electric drive system further includes a motor common mode inductor connected in series between the drive motor and the first relay.
In the implementation process, a motor common-mode inductor is additionally connected in series with the neutral point of the driving motor, so that the common-mode inductance is increased.
Further, the electric drive system further comprises a bidirectional direct current conversion circuit, the bidirectional direct current conversion circuit comprises a conversion inductor, a first conversion power semiconductor switch and a second conversion power semiconductor switch, the first conversion power semiconductor switch and the second conversion power semiconductor switch are connected in series, the first conversion power semiconductor switch is connected with the first power battery, the second conversion power semiconductor switch is connected with the second power battery, one end of the conversion inductor is connected with the first power battery, and the other end of the conversion inductor is connected between the first conversion power semiconductor switch and the second conversion power semiconductor switch.
In the implementation process, by adding a bidirectional direct current conversion circuit, the charge and discharge functions can be realized under the condition that the voltage of the power battery is not high enough.
Further, the bidirectional direct current conversion circuit further comprises a conversion relay connected in series between the conversion inductor and the first power battery.
Further, the voltage of the first power battery and the voltage of the preset ac power supply satisfy:
Figure BDA0004169558270000031
wherein U is 1 U is the voltage of the first power battery ac，rms And presetting a voltage effective value of the alternating current power supply.
Further, the voltage of the first power battery and the voltage of the preset ac power supply satisfy:
Figure BDA0004169558270000032
wherein U is 2 U is the voltage of the first power battery ac，rms And presetting a voltage effective value of the alternating current power supply.
Further, the electric drive assembly further includes a first drive relay connected in series between the first power battery and the three-phase inverter circuit.
Further, the electric drive assembly further includes a second drive relay connected in series between the second power battery and the three-phase inverter circuit.
Further, the electric drive assembly further comprises a direct current bus capacitor, and the direct current bus capacitor is respectively connected with the first power battery and the second power battery.
In a second aspect, embodiments of the present application provide an electric vehicle comprising an integrated ac charge-discharge electric drive system as set forth in any one of the first aspects.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques disclosed herein.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a first integrated ac charge-discharge electric drive system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a second integrated AC charge-discharge electric drive system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a third integrated AC charge-discharge electric drive system according to an embodiment of the present disclosure;
fig. 4 is a simplified schematic diagram of an integrated ac charge-discharge electric drive system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
The embodiment of the application provides an electric drive system integrating alternating-current charge and discharge and an electric vehicle, which can be applied to an electric drive system of the electric vehicle; according to the integrated alternating-current charging and discharging electric drive system, a charging interface component is added, so that a preset alternating-current power supply and a charging interface are disconnected when charging is not needed; when charging is needed, connecting a preset alternating current power supply with a charging interface, connecting one end of alternating current coming from the charging interface to a neutral point of a driving motor winding through a first relay, connecting the other end of alternating current between a first power battery and a second power battery through a second relay, driving and controlling a three-phase inverter circuit through PWM (Pulse width modulation) signals so as to control common mode voltage of the driving motor, and further controlling common mode current of the driving motor, so that alternating current charging of the power batteries can be realized; in addition, the integrated alternating-current charging and discharging electric drive system can also realize that the electric energy in the power battery is discharged to the outside through the charging interface; therefore, the integrated alternating-current charging and discharging electric drive system can realize multiplexing of the electric drive unit circuit, and simultaneously realize the functions of electric drive and alternating-current slow charging, thereby realizing the technical effect of reducing the cost of the whole vehicle.
Referring to fig. 1, fig. 1 is a schematic diagram of a first integrated ac charging and discharging electric driving system according to an embodiment of the present application, where the integrated ac charging and discharging electric driving system includes an electric driving component and a charging interface component.
Illustratively, the electric driving assembly includes a first power battery U1, a second power battery U2, a three-phase inverter circuit and a driving motor M, the first power battery U1 and the second power battery U2 are connected in series, one end of the three-phase inverter circuit is connected with the first power battery U1, the other end of the three-phase inverter circuit is connected with the second power battery U2, and the driving motor M is connected with the three-phase inverter circuit.
In some embodiments, the three-phase inverter circuit includes 6 power switch modules Q1 to Q6 (6 semiconductor power switch devices and 6 anti-parallel diodes), and the connection relationship is shown in fig. 1; among them, the semiconductor power switching device may employ an IGBT (Insulated Gate Bipolar Transistor ) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistor).
Illustratively, the charging interface assembly includes a charging interface, a first relay K1 and a second relay K2, the charging interface is connected to the driving motor M through the first relay K1, the charging interface is connected between the first power battery U1 and the second power battery U2 through the second relay K2, and the charging interface is connected to the preset AC power source AC.
In some embodiments, the charging interface is connected to the midpoint of the battery pack through a second relay K2, and the voltages of the first power battery U1 and the second power battery U2 are equal.
Illustratively, the integrated alternating current charging and discharging electric drive system disconnects the preset alternating current power supply AC from the charging interface when charging is not needed by adding the charging interface component; when charging is needed, a preset alternating current power supply AC is connected with a charging interface, one end of alternating current coming from the charging interface is connected to a neutral point of a winding of a driving motor M through a first relay K1, the other end of alternating current is connected between a first power battery U1 and a second power battery U2 through a second relay K2, a three-phase inverter circuit is driven and controlled through PWM signals, the common mode voltage of the driving motor M is controlled, and the common mode current of the driving motor M is controlled, so that alternating current charging of the power batteries can be realized; in addition, the integrated alternating-current charging and discharging electric drive system can also realize that the electric energy in the power battery is discharged to the outside through the charging interface; therefore, the integrated alternating-current charging and discharging electric drive system can realize multiplexing of the electric drive unit circuit, and simultaneously realize the functions of electric drive and alternating-current slow charging, thereby realizing the technical effect of reducing the cost of the whole vehicle.
Optionally, the preset AC power source AC may be a single-phase AC source, such as a common AC slow-fill pile; the first relay K1 and the second relay K2 are used for disconnecting the high-voltage circuit from the charging interface when charging is not needed; one end of single-phase alternating current coming in from the charging interface is connected to a neutral point of a winding of the driving motor M through a first relay K1, and the other end of single-phase alternating current is connected between the first power battery U1 and the second power battery U2 through a second relay K2;
illustratively, the voltage of the first power battery and the voltage of the preset ac power supply satisfy:
Figure BDA0004169558270000061
wherein U is 1 For the voltage of the first power battery, U ac，rms The voltage effective value of the alternating current power supply is preset;
illustratively, the voltage of the first power battery and the voltage of the preset ac power supply satisfy:
Figure BDA0004169558270000071
wherein U is 2 For the voltage of the first power battery, U ac，rms Is a preset voltage effective value of the alternating current power supply.
In some embodiments, the common mode inductance of the driving motor M may be smaller, and a motor common mode inductor Ln may be additionally connected in series to the neutral point of the driving motor M; referring to fig. 2, fig. 2 is a schematic diagram of a second integrated ac charging and discharging electric driving system according to an embodiment of the present application.
Illustratively, the electric drive system further includes a motor common mode inductor Ln connected in series between the drive motor M and the first relay K1.
Illustratively, the electric drive assembly further includes a first drive relay Kp connected in series between the first power battery U1 and the three-phase inverter circuit.
Illustratively, the electric drive assembly further includes a second drive relay Kn connected in series between the second power battery U2 and the three-phase inverter circuit.
Illustratively, the electric drive assembly further includes a dc bus capacitor Cdc, which is connected to the first power battery U1 and the second power battery U2, respectively.
1-2, when charging is needed, the integrated ac charging and discharging electric drive system provided in the embodiment of the present application closes the first driving relay Kp, the second driving relay Kn, the first relay K1, and the second relay K2, and then drives and controls the 6 power switch modules Q1 to Q6 of the three-phase inverter circuit with PWM to act so as to control the common mode voltage of the driving motor M, and further control the common mode current of the driving motor M, so that ac charging of the batteries (the first power battery U1 and the second power battery U2) can be achieved;
besides alternating current charging, the integrated alternating current charging and discharging electric drive system can realize that electric energy in the power battery is discharged outwards through an alternating current charging interface; at this time, the first driving relay Kp, the second driving relay Kn, the first relay K1 and the second relay K2 are also closed, and then the 6 power switch modules Q1 to Q6 of the three-phase inverter are controlled to act under PWM driving to control the common mode voltage of the driving motor M, so as to control the common mode current of the driving motor M, which is different in that the phase of the common mode current relative to the ac voltage is in an externally discharged state. The externally discharged state may be the state of feeding back electric energy to the power grid, or may be the state of driving a common household appliance, and is not limited herein.
In some embodiments, a bidirectional dc conversion circuit may be added for the case where the power battery voltage is not high enough (e.g., the battery minimum voltage is less than 750V); referring to fig. 3, fig. 3 is a schematic diagram of a third integrated ac charging and discharging electric driving system according to an embodiment of the present application.
The electric drive system further includes a bidirectional direct current conversion circuit including a conversion inductor Lb, a first conversion power semiconductor switch Q7, and a second conversion power semiconductor switch Q8, the first conversion power semiconductor switch Q7 and the second conversion power semiconductor switch Q8 being connected in series, the first conversion power semiconductor switch Q7 being connected to the first power battery U1, the second conversion power semiconductor switch Q8 being connected to the second power battery U2, one end of the conversion inductor Lb being connected to the first power battery U1, and the other end of the conversion inductor Lb being connected between the first conversion power semiconductor switch Q7 and the second conversion power semiconductor switch Q8.
Illustratively, the bi-directional dc conversion circuit further includes a conversion relay Kac connected in series between the conversion inductor Lb and the first power battery U1.
In some embodiments, when charging or discharging is required, the transformation relay Kac and the second driving relay Kn are closed at this time, and the first driving relay Kp is not closed, and the relatively low voltage on the battery side is raised to a high direct current bus voltage (Udc, that is, the voltage on both sides of the direct current bus capacitor Cdc) through the bidirectional direct current transformation circuit, so that the direct current bus voltage Udc meets the requirement of single-phase alternating current charging or discharging. When the motor is normally driven, the transformation relay Kac, the first recording relay K1 and the second relay K2 are disconnected, the first driving relay Kp and the second driving relay Kn are closed, the bidirectional direct current transformation circuit does not work, and the three-phase inverter circuit operates according to the driving requirement of the normal motor. The battery voltage should satisfy at this time:
Figure BDA0004169558270000081
Figure BDA0004169558270000082
for example, when the integrated ac charge-discharge electric drive system shown in fig. 3 performs single-phase charging and discharging, it may control all upper bridge arms of the three-phase inverter circuit to switch simultaneously, and all lower bridge arms to switch simultaneously, i.e. Q1, Q2, Q3 (upper bridge) synchronous switch, Q2, Q4, Q6 (lower bridge) synchronous switch, or three bridge arms may adopt three-phase interleaved PWM driving, so as to further reduce common mode current ripple.
Referring to fig. 4, fig. 4 is a simplified schematic diagram of an integrated ac charge-discharge electric driving system according to an embodiment of the present application.
For example, regardless of the above, if the upper bridges (Q1, Q2, Q3) of the three-phase inverter circuit are synchronously switched, the three-phase inverter circuit together with the driving motor M can be simplified to a circuit as shown in fig. 4. Where Ln is the equivalent common-mode inductance (including the common-mode inductance of the drive motor M itself and the inductance that may be added in series). QH and QL are equivalent upper and lower bridge switches;
wherein QH and QL are complementarily conducted, and the current flowing through Ln can be controlled by controlling the proportion occupied by QH on, so that single-phase charging or discharging is realized. This is a principle that engineers in the field of power electronics can understand, and will not be described here in detail.
Exemplary, embodiments of the present application provide an electric vehicle including an integrated ac charge-discharge electric drive system as shown in fig. 1-4.
In several embodiments provided in this application, it should be understood that each functional module in each embodiment may be integrated together to form a separate part, or each module may exist separately, or two or more modules may be integrated to form a separate part.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. An integrated alternating current charging and discharging electric drive system is characterized by comprising an electric drive assembly and a charging interface assembly;
the electric driving assembly comprises a first power battery, a second power battery, a three-phase inverter circuit and a driving motor, wherein the first power battery and the second power battery are connected in series, one end of the three-phase inverter circuit is connected with the first power battery, the other end of the three-phase inverter circuit is connected with the second power battery, and the driving motor is connected with the three-phase inverter circuit;
the charging interface assembly comprises a charging interface, a first relay and a second relay, wherein the charging interface is connected with the driving motor through the first relay, the charging interface is connected between the first power battery and the second power battery through the second relay, and the charging interface is connected with a preset alternating current power supply.
2. The integrated ac charge-discharge electric drive system of claim 1 further comprising a motor common mode inductor connected in series between the drive motor and the first relay.
3. The integrated ac charge-discharge electric drive system of claim 1 further comprising a bi-directional dc conversion circuit comprising a conversion inductor, a first conversion power semiconductor switch and a second conversion power semiconductor switch connected in series, the first conversion power semiconductor switch connected to the first power battery, the second conversion power semiconductor switch connected to the second power battery, one end of the conversion inductor connected to the first power battery, the other end of the conversion inductor connected between the first conversion power semiconductor switch and the second conversion power semiconductor switch.
4. The integrated ac charge-discharge electric drive system of claim 3 wherein the bi-directional dc conversion circuit further comprises a conversion relay connected in series between the conversion inductor and the first power cell.
5. The integrated ac charge-discharge electric drive system of claim 1, wherein the voltage of the first power cell and the voltage of the preset ac power source satisfy:
Figure FDA0004169558260000021
wherein U is 1 U is the voltage of the first power battery ac，rms And presetting a voltage effective value of the alternating current power supply.
6. The integrated ac charge-discharge electric drive system of claim 1 or 5, wherein the voltage of the first power cell and the voltage of the preset ac power supply satisfy:
Figure FDA0004169558260000022
wherein U is 2 U is the voltage of the first power battery ac，rms And presetting a voltage effective value of the alternating current power supply.
7. The integrated ac charge-discharge electric drive system of claim 1, wherein the electric drive assembly further comprises a first drive relay connected in series between the first power cell and the three-phase inverter circuit.
8. The integrated ac charge-discharge electric drive system of claim 1 or 7, wherein the electric drive assembly further comprises a second drive relay connected in series between the second power cell and the three-phase inverter circuit.
9. The integrated ac charge-discharge electric drive system of claim 1, wherein the electric drive assembly further comprises a dc bus capacitor connected to the first power cell and the second power cell, respectively.
10. An electric vehicle comprising an integrated ac charge-discharge electric drive system as claimed in any one of claims 1 to 9.
CN202310373563.4A 2023-04-07 2023-04-07 Electric drive system integrating alternating-current charging and discharging and electric vehicle Pending CN116238350A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116707102A (en) * 2023-08-09 2023-09-05 广汽埃安新能源汽车股份有限公司 Electric drive and charge integrated system, control method, vehicle and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116707102A (en) * 2023-08-09 2023-09-05 广汽埃安新能源汽车股份有限公司 Electric drive and charge integrated system, control method, vehicle and electronic device
CN116707102B (en) * 2023-08-09 2024-01-19 广汽埃安新能源汽车股份有限公司 Electric drive and charge integrated system, control method, vehicle and electronic device

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