CN115378103B - Engineering machinery driving and charging integrated circuit based on double three-phase motors - Google Patents

Engineering machinery driving and charging integrated circuit based on double three-phase motors Download PDF

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Publication number
CN115378103B
CN115378103B CN202210973802.5A CN202210973802A CN115378103B CN 115378103 B CN115378103 B CN 115378103B CN 202210973802 A CN202210973802 A CN 202210973802A CN 115378103 B CN115378103 B CN 115378103B
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contact switch
contact
phase motor
bidirectional
converter
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CN115378103A (en
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杜贵平
邓卓峰
雷雁雄
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South China University of Technology SCUT
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South China University of Technology SCUT
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Classifications

    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without 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
    • H02M7/217—Conversion of ac power input into dc power output without 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
    • H02M7/2173—Conversion of ac power input into dc power output without 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 in a biphase or polyphase circuit arrangement
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without 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
    • H02M7/217—Conversion of ac power input into dc power output without 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
    • H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without 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
    • H02M7/537—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • 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
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • 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
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses an engineering machinery driving and charging integrated circuit based on double three-phase motors, wherein the implementation mode of charging is that a first stator winding and a second stator winding of a first three-phase motor are connected in series, a third stator winding of the first three-phase motor is connected in series with a first stator winding of a second three-phase motor, and a second stator winding and a third stator winding of the second three-phase motor are connected in series and are respectively connected with three interfaces of a three-phase power grid. The other end of each stator winding of the first and second three-phase motors charges the power battery through a bidirectional DC/AC converter. The circuit can realize three-phase input fast charging, greatly reduces the volume and weight of a charging system, and has the advantages of high charging power, high power density, simple principle, high reliability, high flexibility and wide application range.

Description

Engineering machinery driving and charging integrated circuit based on double three-phase motors
Technical Field
The invention relates to the technical field of engineering machinery charging, in particular to an engineering machinery driving and charging integrated circuit based on a double three-phase motor.
Background
The driving motor of the engineering machinery mostly adopts a three-phase permanent magnet synchronous motor or a three-phase induction motor, the traditional charging mode is mainly divided into vehicle-mounted charging and vehicle-mounted charging, a vehicle-mounted charging charger is arranged in a vehicle and can be directly connected into a power grid for charging, but the volume and the weight are limited, so that the defects of smaller charging power and short vehicle endurance exist; charging is carried out through a charging pile outside the vehicle, and direct current is input to the battery through the charging pile. Since the vehicle volume and weight are not occupied, the high-power charging can be designed. However, the method has the defects of difficult planning in the earlier stage and high construction cost. Because the motor driving system and the vehicle-mounted charging system of the vehicle work in a time-sharing mode, and the circuit structure is very similar to the used devices, students propose to realize the battery charging function by utilizing the motor driving system and construct a driving and charging integrated circuit.
Work machines are typically equipped with a plurality of motors for specific work applications of the work machine. For the common working scheme of double three-phase motors, one motor is generally a walking motor, so that the vehicle can walk; one motor is a hydraulic motor, so that the construction actions of engineering machinery such as pushing, digging, lifting and the like are realized. The current most common scheme is that two ends of a single-phase power grid are respectively connected with neutral points of two three-phase motors, the other ends of the two three-phase motors are respectively connected with two bidirectional DC/AC converters, and the two bidirectional DC/AC converters are connected with a battery after being connected in parallel. According to the scheme, on the premise that a three-phase rectifier is not additionally added, only single-phase charging can be realized, and the charging power is low.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a double three-phase motor-based engineering machinery driving and charging integrated circuit which is safe, reliable and higher in power density.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the engineering machinery driving and charging integrated circuit based on the double three-phase motor comprises a power battery, a bidirectional DC/DC converter, a first bidirectional DC/AC converter, a second bidirectional DC/AC converter, a first three-phase motor, a second three-phase motor, a first conversion contact switch, a second conversion contact switch, a third conversion contact switch, a first single contact switch, a second single contact switch, a third single contact switch, a fourth single contact switch, a fifth single contact switch, a sixth single contact switch, a seventh single contact switch, an eighth single contact switch and an alternating current interface;
The alternating-current side of the first bidirectional DC/AC converter is provided with three bridge arms, namely a first bridge arm, a second bridge arm and a third bridge arm; the alternating-current side of the second bidirectional DC/AC converter is provided with three bridge arms, namely a first bridge arm, a second bridge arm and a third bridge arm; the first three-phase motor and the second three-phase motor comprise three stator windings, namely a first stator winding, a second stator winding and a third stator winding from top to bottom, and each stator winding is provided with two terminals; the first conversion contact switch comprises a common contact and two conversion contacts, wherein the two conversion contacts are a first contact and a second contact respectively; the second transfer contact switch comprises a common contact and two transfer contacts, wherein the two transfer contacts are a first contact and a second contact respectively; the third transfer contact switch comprises a common contact and two transfer contacts, wherein the two transfer contacts are a first contact and a second contact respectively; the alternating current interface is provided with three terminals, namely a first terminal, a second terminal and a third terminal;
The positive and negative poles of the low-voltage side of the bidirectional DC/DC converter are connected with the positive and negative poles of the power battery, and the positive and negative poles of the high-voltage side of the bidirectional DC/DC converter are respectively connected with the positive and negative poles of the direct current sides of the first bidirectional DC/AC converter and the second bidirectional DC/AC converter;
Two ends of a first stator winding of the first three-phase motor are respectively connected with a third single-contact switch and a first terminal of an alternating current interface, two ends of a second stator winding of the first three-phase motor are respectively connected with a second bridge arm of a first bidirectional DC/AC converter and a common contact of a first conversion contact switch, and two ends of a third stator winding of the first three-phase motor are respectively connected with a fifth single-contact switch and a second terminal of the alternating current interface; three terminals of the first three-phase motor, which are connected with the third, fourth and fifth single-contact switches, are a group of homonymous terminals, and the other three terminals of the first three-phase motor are another group of homonymous terminals;
The first stator winding of the second three-phase motor is connected with the common contact of the third bridge arm of the second bidirectional DC/AC converter and the second conversion contact switch, two ends of the second stator winding of the second three-phase motor are respectively connected with the seventh single-contact switch and the third terminal of the alternating current interface, and two ends of the third stator winding of the second three-phase motor are respectively connected with the common contact of the first bridge arm of the second bidirectional DC/AC converter and the third conversion contact switch; the three terminals of the second three-phase motor, which are connected with the sixth, seventh and eighth single-contact switches, are a group of homonymous terminals, and the other three terminals of the second three-phase motor are another group of homonymous terminals;
The first contact and the second contact of the first conversion contact switch are respectively connected with the midpoint of a first bridge arm of the first bidirectional DC/AC converter and a first terminal of an alternating current interface; the first contact and the second contact of the second conversion contact switch are respectively connected with the midpoint of the third bridge arm of the first bidirectional DC/AC converter and the second single contact switch; the first contact and the second contact of the third transfer contact switch are respectively connected with the midpoint of the second bridge arm of the second bidirectional DC/AC converter and the third terminal of the alternating current interface; two ends of the first single-contact switch are respectively connected with a first terminal and a second terminal of the alternating current interface; two ends of the second single-contact switch are respectively connected with a third terminal of the alternating current interface and a second contact of the second conversion contact switch; two ends of the third single-contact switch are respectively connected with the midpoint of a first bridge arm of the first bidirectional DC/AC converter and a first stator winding of the first three-phase motor; two ends of the fourth single-contact switch are respectively connected with the midpoint of the second bridge arm of the first bidirectional DC/AC converter and the midpoint of the first bridge arm of the first bidirectional DC/AC converter; two ends of the fifth single-contact switch are respectively connected with the midpoint of a third bridge arm of the first bidirectional DC/AC converter and a third stator winding of the first three-phase motor; two ends of the sixth single-contact switch are respectively connected with the midpoint of the third bridge arm of the first bidirectional DC/AC converter and the midpoint of the third bridge arm of the second bidirectional DC/AC converter; two ends of the seventh single-contact switch are respectively connected with the midpoint of a second bridge arm of the second bidirectional DC/AC converter and a second stator winding of the second three-phase motor; and two ends of the eighth single-contact switch are respectively connected with the midpoint of the second bridge arm of the second bidirectional DC/AC converter and the third stator winding of the second three-phase motor.
Further, when the first contact of the first conversion contact switch is opened and the second contact of the second conversion contact switch is closed, the first contact of the third conversion contact switch is opened and the second contact of the second conversion contact switch is closed, the first single contact switch, the second single contact switch, the third single contact switch, the fifth single contact switch, the seventh single contact switch are closed, and the fourth single contact switch, the sixth single contact switch and the eighth single contact switch are opened, the first three-phase motor and the second three-phase motor operate in a motor driving mode; when the first contact of the first conversion contact switch is closed and the second contact of the second conversion contact switch is opened, the first contact of the second conversion contact switch is closed and the second contact of the third conversion contact switch is opened, the first single contact switch, the second single contact switch, the third single contact switch, the fifth single contact switch and the seventh single contact switch are opened, and the fourth single contact switch, the sixth single contact switch and the eighth single contact switch are closed, the circuit works in a battery charging mode, at the moment, the first stator winding and the second stator winding of the first three-phase motor are connected in series, the third stator winding of the first three-phase motor and the first stator winding of the second three-phase motor are connected in series, and the second stator winding and the third stator winding of the second three-phase motor are connected in series.
Further, in the battery charging mode, when the input source is a three-phase power grid, three terminals of the alternating current interface are connected with the three-phase power grid.
Further, the first three-phase motor and the second three-phase motor are three-phase permanent magnet synchronous motors or three-phase induction motors with wiring led out from two ends of three stator windings.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. high charging power and high power density.
Compared with the traditional single-phase charging scheme, the invention has the advantages that the charging power is improved due to the adoption of the three-phase charging, and the equivalent inductance is increased due to the use of the series topology, so that the invention is suitable for a motor with small inductance.
2. The principle is simple and the reliability is high.
When the invention is switched to the driving mode, the driving circuit is consistent with the traditional three-phase motor driving circuit, and the traditional motor control is adopted; when the motor is switched to a charging mode, the motor is consistent with the traditional three-phase PWM rectification circuit, only the power factor correction control is needed, the same current of the stator windings of the two-phase motor is equal, the motor torque elimination can be realized without additional current sharing control, and the reliability is high.
3. High flexibility and wide application range.
The two three-phase motors do not generate torque during charging, and different shaft work can be realized, so that the independent use requirement of the engineering machinery walking motor and the hydraulic motor can be realized.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is an equivalent circuit diagram of the present invention when operating in a motor drive mode.
Fig. 3 is an equivalent circuit diagram of the present invention when operating in a three-phase input charging mode.
Fig. 4 is a graph of the DC terminal voltage, the power battery terminal voltage, and the power battery charging current of the bi-directional DC/AC converter of the present invention when operating in a three-phase input charging mode.
Fig. 5 is a graph of three-phase input current and a-phase grid voltage for the present invention when operating in a three-phase input charging mode.
Fig. 6 is a graph of three-phase input current THD when the present invention is operating in a three-phase input charging mode.
Fig. 7 is a current flow diagram through a stator winding of a first three-phase motor when the present invention is operating in a three-phase input charging mode.
Fig. 8 is a current flow diagram through a stator winding of a second three-phase motor when the present invention is operating in a three-phase input charging mode.
Fig. 9 is an electromagnetic torque diagram of a first three-phase motor when the present invention is operating in a three-phase input charging mode.
Fig. 10 is an electromagnetic torque diagram of a second three-phase motor when the present invention is operating in a three-phase input charging mode.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto. The invention includes all charging implementations of two phases of the motor in series, and the following description will take the series connection of a first stator winding and a second stator winding of a first three-phase motor, the series connection of a third stator winding of the first three-phase motor and a first stator winding of a second three-phase motor, and the series connection of a second stator winding and a third stator winding of the second three-phase motor as examples.
As shown in fig. 1, the present embodiment discloses an integrated driving and charging circuit for a construction machine based on a double three-phase motor, which comprises a power battery 1, a bidirectional DC/DC converter 2, a first bidirectional DC/AC converter 3, a second bidirectional DC/AC converter 4, a first three-phase motor 5, a second three-phase motor 6, a first changeover contact switch 7, a second changeover contact switch 8, a third changeover contact switch 9, a first single contact switch 10, a second single contact switch 11, a third single contact switch 12, a fourth single contact switch 13, a fifth single contact switch 14, a sixth single contact switch 15, a seventh single contact switch 16, An eighth single contact switch 17 and an ac interface 18; The alternating current side of the first bidirectional DC/AC converter 3 is provided with three bridge arms, namely a first bridge arm a11, a second bridge arm a12 and a third bridge arm a13; the alternating current side of the second bidirectional DC/AC converter 4 is provided with three bridge arms, namely a first bridge arm a21, a second bridge arm a22 and a23, a third bridge arm a21 and a third bridge arm a23; the first three-phase motor 5 and the second three-phase motor 6 comprise three stator windings, namely a first stator winding, a second stator winding and a third stator winding from top to bottom, and each stator winding is provided with two terminals; the first changeover contact switch 7 comprises a common contact and two changeover contacts, wherein the two changeover contacts are respectively a first contact b11 and a second contact b12; The second changeover contact switch 8 comprises a common contact and two changeover contacts, which are respectively a first and a second contact b21, b22; the third transfer contact switch 9 comprises a common contact and two transfer contacts, which are respectively a first contact b31 and a second contact b32; the ac interface 18 has three terminals, namely, a first terminal, a second terminal, and a third terminal, namely, c1, c2, and c3; the positive and negative poles of the low-voltage side of the bidirectional DC/DC converter 2 are connected with the positive and negative poles of the power battery 1, and the positive and negative poles of the high-voltage side of the bidirectional DC/DC converter 2 are respectively connected with the positive and negative poles of the direct-current sides of the first bidirectional DC/AC converter 3 and the second bidirectional DC/AC converter 4; Two ends of a first stator winding of the first three-phase motor 5 are respectively connected with a third single-contact switch 12 and a first terminal c1 of an alternating current interface 18, two ends of a second stator winding of the first three-phase motor 5 are respectively connected with a second bridge arm a12 of a first bidirectional DC/AC converter and a common contact of a first conversion contact switch 7, and two ends of a third stator winding of the first three-phase motor 5 are respectively connected with a fifth single-contact switch 14 and a second terminal c2 of the alternating current interface 18; three terminals of the first three-phase motor 5 connected with the third, fourth and fifth single-contact switches 12, 13 and 14 are a group of homonymous terminals, and the other three terminals of the first three-phase motor 5 are another group of homonymous terminals; The first stator winding of the second three-phase motor 6 is connected with the third bridge arm a23 of the second bidirectional DC/AC converter 4 and the common contact of the second transfer contact switch 8, two ends of the second stator winding of the second three-phase motor 6 are respectively connected with the seventh single-contact switch 16 and the third terminal c3 of the AC interface 18, and two ends of the third stator winding of the second three-phase motor 6 are respectively connected with the first bridge arm a21 of the second bidirectional DC/AC converter 4 and the common contact of the third transfer contact switch 9; three terminals of the second three-phase motor 6 connected with the sixth, seventh and eighth single-contact switches 15, 16 and 17 are a group of homonymous terminals, and the other three terminals of the second three-phase motor 6 are another group of homonymous terminals; The first contact b11 and the second contact b12 of the first conversion contact switch 7 are respectively connected with the midpoint of the first bridge arm a11 of the first bidirectional DC/AC converter 3 and the first terminal c1 of the alternating current interface 18; the first contact b21 and the second contact b22 of the second transfer contact switch 8 are respectively connected with the midpoint of the third bridge arm a13 of the first bidirectional DC/AC converter 3 and the second single contact switch 11; the first contact b31 and the second contact b32 of the third transfer contact switch 9 are respectively connected with the midpoint of the second bridge arm a22 of the second bidirectional DC/AC converter 4 and the third terminal c3 of the AC interface 18; the two ends of the first single-contact switch 10 are respectively connected with a first terminal c1 and a second terminal c2 of the alternating current interface 18; both ends of the second single-contact switch 11 are respectively connected with a third terminal c3 of the alternating current interface 18 and a second contact b22 of the second changeover contact switch 8; two ends of the third single-contact switch 12 are respectively connected with the midpoint of the first bridge arm a11 of the first bidirectional DC/AC converter 3 and the first stator winding of the first three-phase motor 5; two ends of the fourth single-contact switch 13 are respectively connected with the midpoint of the second bridge arm a12 of the first bidirectional DC/AC converter 3 and the midpoint of the first bridge arm a11 of the first bidirectional DC/AC converter 3; Two ends of the fifth single-contact switch 14 are respectively connected with the midpoint of the third bridge arm a13 of the first bidirectional DC/AC converter 3 and the third stator winding of the first three-phase motor 5; two ends of the sixth single-contact switch 15 are respectively connected with a midpoint of a third bridge arm a13 of the first bidirectional DC/AC converter 3 and a midpoint of a third bridge arm a23 of the second bidirectional DC/AC converter 4; two ends of the seventh single-contact switch 16 are respectively connected with the midpoint of a second bridge arm a22 of the second bidirectional DC/AC converter 4 and a second stator winding of the second three-phase motor 6; and two ends of the eighth single-contact switch 17 are respectively connected with the midpoint of the second bridge arm a22 of the second bidirectional DC/AC converter 4 and the third stator winding of the second three-phase motor 6.
The implementation mode of the circuit is as follows: when the first contact b11 of the first changeover contact switch 7 is opened and the second contact b12 is closed, the first contact b21 of the second changeover contact switch 8 is opened and the second contact b22 is closed, the first contact b31 of the third changeover contact switch 9 is opened and the second contact b32 is closed, the first single contact switch 10, the second single contact switch 11, the third single contact switch 12, the fifth single contact switch 14, the seventh single contact switch 16 is closed and the fourth single contact switch 13, the sixth single contact switch 15 and the eighth single contact switch 17 are opened, the first three-phase motor 5 and the second three-phase motor 6 operate in the motor driving mode, as shown in fig. 2, which is an equivalent circuit diagram when the circuit of the present invention operates in the motor driving mode; when the first contact b11, the second contact b12 and the first changeover contact switch 7 are closed, the first contact b21 and the second contact b22 of the second changeover contact switch 8 are closed, the first contact b31 and the second contact b32 of the third changeover contact switch 9 are open, the first single contact switch 10, the second single contact switch 11, the third single contact switch 12, the fifth single contact switch 14, the seventh single contact switch 16 are open, and the fourth single contact switch 13, the sixth single contact switch 15 and the eighth single contact switch 17 are closed, the circuit operates in the battery charging mode, at which time the first stator winding and the second stator winding of the first three-phase motor 5 are connected in series, the third stator winding of the first three-phase motor 5 is connected in series with the first stator winding of the second three-phase motor 6, and the second stator winding and the third stator winding of the second three-phase motor 6 are connected in series.
In battery charging mode, when the input source is a three-phase power grid, the three terminals of the ac interface 12 are connected to the three-phase power grid.
Preferably, the first three-phase motor 5 and the second three-phase motor 6 are three-phase permanent magnet synchronous motors or three-phase induction motors with wires led out from two ends of three stator windings.
The torque cancellation principle of the three-phase input charging mode is analyzed below, and its equivalent circuit is shown in fig. 3.
The three-phase power grid current is:
iga＝Imcosωt
Wherein I m is the grid current amplitude, ωt is the grid current phase.
According to the circuit connection mode, the currents of the three stator windings of the first three-phase motor 5 and the second three-phase motor 6 can be obtained as follows:
ia1＝ib1＝Imcosωt
performing clark equal power conversion on the formula to obtain:
Wherein i α1 and i β1 are the alpha-direction component and the beta-direction component, respectively, of the stator winding current of the first three-phase motor 5, and i α2 and i β2 are the alpha-direction component and the beta-direction component, respectively, of the stator winding current of the second three-phase motor 6 and
If the three-phase motor is an induction motor, the included angle of the stator winding current in the alpha beta plane is a fixed value, and the generated magnetic field is a pulsating magnetic field, so that the rotor cannot cut the magnetic induction line to generate current, and cannot generate torque.
If the three-phase motor is a permanent magnet synchronous motor, park conversion is performed for the first three-phase motor 5:
Wherein θ is the angle between the rotor d-axis and the stator d-axis.
Let I q =0, get
Similarly, when Park conversion is performed on the second three-phase motor 6, if the second three-phase motor θ is 0, I q =0.
Taking a surface-mounted permanent magnet synchronous motor as an example, the torque of the surface-mounted permanent magnet synchronous motor is as follows:
Te＝npψfiq
Where n p is the rotor pole pair number, ψ f is the rotor flux linkage, and i q is the Park transformed q-axis current. For the first three-phase motor 5, when θ is When T e = 0, no starting torque is generated; similarly, for the second three-phase motor 6, when θ is 0, T e =0, and no starting torque is generated.
Simulation test is carried out on the three-phase input charging mode in MATLAB/Simulink, and the results are shown in figures 4-10. The direct current end voltage of the bidirectional DC/AC converter is set to be 800V, the end voltage of the power battery 1 is 400V, the charging current of the power battery 1 is 100A, and as can be seen from fig. 4, the direct current end voltage U dc of the bidirectional DC/AC converter is stabilized at 800V, the end voltage U b of the power battery 1 is stabilized at 400V, the charging current I b of the power battery 1 is stabilized at 100A, and the tracking effect is good; it can be seen from fig. 5 that the circuit implements a unity power factor; fig. 6 shows THD values of three-phase input current, with reduced current distortion; it can be seen from fig. 7 and 8 that the magnitudes and phases of the three stator winding currents of the first three-phase motor 5 and the second three-phase motor 6 are consistent with the theoretical analysis; as can be seen from fig. 9 and 10, the electromagnetic torque of the first three-phase motor 5 and the second three-phase motor 6 during charging is 0, and torque cancellation is achieved.
The foregoing embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the foregoing embodiments, and any other changes, modifications, substitutions, combinations, simplifications (e.g., changing the phase sequence of the three-phase motor or the inverter bridge arm, etc.) without departing from the spirit and principles of the present invention should be equivalent substitution, and are included in the scope of the present invention.

Claims (4)

1. Engineering machinery driving and charging integrated circuit based on double three-phase motors, and is characterized in that: the power battery comprises a power battery (1), a bidirectional DC/DC converter (2), a first bidirectional DC/AC converter (3), a second bidirectional DC/AC converter (4), a first three-phase motor (5), a second three-phase motor (6), a first conversion contact switch (7), a second conversion contact switch (8), a third conversion contact switch (9), a first single-contact switch (10), a second single-contact switch (11), a third single-contact switch (12), a fourth single-contact switch (13), a fifth single-contact switch (14), a sixth single-contact switch (15), a seventh single-contact switch (16), an eighth single-contact switch (17) and an alternating-current interface (18);
Three bridge arms are arranged on the alternating current side of the first bidirectional DC/AC converter (3), and are respectively a first bridge arm (a 11), a second bridge arm (a 12) and a third bridge arm (a 13); the alternating current side of the second bidirectional DC/AC converter (4) is provided with three bridge arms, namely a first bridge arm (a 21), a second bridge arm (a 22) and a third bridge arm (a 23); the first three-phase motor (5) and the second three-phase motor (6) comprise three stator windings, namely a first stator winding, a second stator winding and a third stator winding from top to bottom, and each stator winding is provided with two terminals; the first changeover contact switch (7) comprises a common contact and two changeover contacts, wherein the two changeover contacts are respectively a first contact and a second contact (b 11) and a second contact (b 12); the second transfer contact switch (8) comprises a common contact and two transfer contacts, wherein the two transfer contacts are respectively a first contact (b 21) and a second contact (b 22); the third transfer contact switch (9) comprises a common contact and two transfer contacts, wherein the two transfer contacts are respectively a first contact (b 31) and a second contact (b 32); the alternating current interface (18) is provided with three terminals, namely a first terminal (c 1), a second terminal (c 2) and a third terminal (c 3);
The positive electrode and the negative electrode of the low-voltage side of the bidirectional DC/DC converter (2) are connected with the positive electrode and the negative electrode of the power battery (1), and the positive electrode and the negative electrode of the high-voltage side of the bidirectional DC/DC converter (2) are respectively connected with the positive electrode and the negative electrode of the direct current side of the first bidirectional DC/AC converter (3) and the second bidirectional DC/AC converter (4);
Two ends of a first stator winding of the first three-phase motor (5) are respectively connected with a third single-contact switch (12) and a first terminal (c 1) of an alternating current interface (18), two ends of a second stator winding of the first three-phase motor (5) are respectively connected with a second bridge arm (a 12) of a first bidirectional DC/AC converter (3) and a common contact of a first conversion contact switch (7), and two ends of a third stator winding of the first three-phase motor (5) are respectively connected with a fifth single-contact switch (14) and a second terminal (c 2) of the alternating current interface (18); three terminals of the first three-phase motor (5) connected with the third, fourth and fifth single-contact switches (12), (13) and (14) are a group of homonymous terminals, and the other three terminals of the first three-phase motor (5) are another group of homonymous terminals;
The first stator winding of the second three-phase motor (6) is connected with a common contact of a third bridge arm (a 23) of the second bidirectional DC/AC converter (4) and the second conversion contact switch (8), two ends of the second stator winding of the second three-phase motor (6) are respectively connected with a seventh single-contact switch (16) and a third terminal (c 3) of the alternating current interface (18), and two ends of the third stator winding of the second three-phase motor (6) are respectively connected with a common contact of a first bridge arm (a 21) of the second bidirectional DC/AC converter (4) and the third conversion contact switch (9); three terminals of the second three-phase motor (6) connected with the sixth, seventh and eighth single-contact switches (15), (16) and (17) are a group of homonymous terminals, and the other three terminals of the second three-phase motor (6) are another group of homonymous terminals;
The first contact (b 11) and the second contact (b 12) of the first conversion contact switch (7) are respectively connected with the midpoint of the first bridge arm (a 11) of the first bidirectional DC/AC converter (3) and the first terminal (c 1) of the alternating current interface (18); the first contact (b 21) and the second contact (b 22) of the second transfer contact switch (8) are respectively connected with the midpoint of the third bridge arm (a 13) of the first bidirectional DC/AC converter (3) and the second single contact switch (11); the first contact (b 31) and the second contact (b 32) of the third transfer contact switch (9) are respectively connected with the midpoint of the second bridge arm (a 22) of the second bidirectional DC/AC converter (4) and the third terminal (c 3) of the alternating current interface (18); both ends of the first single-contact switch (10) are respectively connected with a first terminal (c 1) and a second terminal (c 2) of the alternating current interface (18); both ends of the second single-contact switch (11) are respectively connected with a third terminal (c 3) of the alternating current interface (18) and a second contact (b 22) of the second conversion contact switch (8); two ends of the third single-contact switch (12) are respectively connected with the midpoint of a first bridge arm (a 11) of the first bidirectional DC/AC converter (3) and a first stator winding of the first three-phase motor (5); two ends of the fourth single-contact switch (13) are respectively connected with the midpoint of the second bridge arm (a 12) of the first bidirectional DC/AC converter (3) and the midpoint of the first bridge arm (a 11) of the first bidirectional DC/AC converter (3); two ends of the fifth single-contact switch (14) are respectively connected with the midpoint of a third bridge arm (a 13) of the first bidirectional DC/AC converter (3) and a third stator winding of the first three-phase motor (5); two ends of the sixth single-contact switch (15) are respectively connected with the midpoint of a third bridge arm (a 13) of the first bidirectional DC/AC converter (3) and the midpoint of a third bridge arm (a 23) of the second bidirectional DC/AC converter (4); two ends of the seventh single-contact switch (16) are respectively connected with the midpoint of a second bridge arm (a 22) of the second bidirectional DC/AC converter (4) and a second stator winding of the second three-phase motor (6); and two ends of the eighth single-contact switch (17) are respectively connected with the midpoint of a second bridge arm (a 22) of the second bidirectional DC/AC converter (4) and a third stator winding of the second three-phase motor (6).
2. The integrated circuit of driving and charging of a construction machine based on a double three-phase motor according to claim 1, characterized in that when the first contact (b 11) of the first changeover contact switch (7) is open, the second contact (b 12) is closed, the first contact (b 21) of the second changeover contact switch (8) is open, the second contact (b 22) is closed, the first contact (b 31) of the third changeover contact switch (9) is open, the second contact (b 32) is closed, the first single contact switch (10), the second single contact switch (11), the third single contact switch (12), the fifth single contact switch (14), the seventh single contact switch (16) is closed and the fourth single contact switch (13), the sixth single contact switch (15), the eighth single contact switch (17) is open, the first three-phase motor (5) and the second three-phase motor (6) are operated in motor driving mode; when the first contact (b 11) of the first changeover contact switch (7) is closed, the second contact (b 12) is open, the first contact (b 21) of the second changeover contact switch (8) is closed, the second contact (b 22) is open, the first contact (b 31) of the third changeover contact switch (9) is closed, the second contact (b 32) is open, the first single contact switch (10), the second single contact switch (11), the third single contact switch (12), the fifth single contact switch (14), the seventh single contact switch (16) are open, and the fourth single contact switch (13), the sixth single contact switch (15) and the eighth single contact switch (17) are closed, the circuit operates in a battery charging mode, at which time the first stator winding and the second stator winding of the first three-phase motor (5) are connected in series, the third stator winding of the first three-phase motor (5) and the first stator winding of the second three-phase motor (6) are connected in series, and the second stator winding and the third stator winding of the second three-phase motor (6) are connected in series.
3. The integrated circuit for driving and charging a construction machine based on a double three-phase motor according to claim 2, wherein in the battery charging mode, when the input source is a three-phase network, the three terminals of the ac interface (18) are connected to the three-phase network.
4. The double-three-phase motor-based engineering machinery driving and charging integrated circuit according to claim 1, wherein the first three-phase motor (5) and the second three-phase motor (6) are three-phase permanent magnet synchronous motors or three-phase induction motors with wiring led out from two ends of three stator windings.
CN202210973802.5A 2022-08-15 2022-08-15 Engineering machinery driving and charging integrated circuit based on double three-phase motors Active CN115378103B (en)

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CN112757919A (en) * 2021-01-27 2021-05-07 华南理工大学 Electric automobile driving and charging integrated circuit based on single-phase filter inductor
CN112787390A (en) * 2021-01-27 2021-05-11 华南理工大学 Electric automobile driving and charging integrated circuit and torque eliminating control method thereof

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CN112803561B (en) * 2021-01-27 2022-09-20 华南理工大学 Electric automobile integrated charging circuit based on auxiliary inductance and three-phase motor drive
CN113422560B (en) * 2021-06-30 2022-11-11 北京理工大学 Vehicle-mounted integrated charger driving circuit based on double three-phase permanent magnet synchronous motor driving system
CN113844296A (en) * 2021-09-19 2021-12-28 浙江大学 Electric automobile integrated charger based on double three-phase motors and control method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112757919A (en) * 2021-01-27 2021-05-07 华南理工大学 Electric automobile driving and charging integrated circuit based on single-phase filter inductor
CN112787390A (en) * 2021-01-27 2021-05-11 华南理工大学 Electric automobile driving and charging integrated circuit and torque eliminating control method thereof

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