CN115549529B - Double three-phase motor parallel driving and charging integrated circuit applied to electric engineering machinery - Google Patents
Double three-phase motor parallel driving and charging integrated circuit applied to electric engineering machinery Download PDFInfo
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- CN115549529B CN115549529B CN202211119951.1A CN202211119951A CN115549529B CN 115549529 B CN115549529 B CN 115549529B CN 202211119951 A CN202211119951 A CN 202211119951A CN 115549529 B CN115549529 B CN 115549529B
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- 238000004804 winding Methods 0.000 claims abstract description 69
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000012546 transfer Methods 0.000 claims description 14
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000819 phase cycle Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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
- 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
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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
-
- 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
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- 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
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a double-three-phase motor parallel driving and charging integrated circuit applied to electric engineering machinery. 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, wide application range, simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of engineering machinery charging, in particular to a double three-phase motor parallel driving and charging integrated circuit applied to electric engineering machinery.
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. The scheme can only realize single-phase charging, and the charging power is not large.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a double three-phase motor parallel driving and charging integrated circuit which is safe, reliable and higher in power density and applied to electric engineering machinery.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the double three-phase motor parallel driving and charging integrated circuit applied to the electric engineering machinery 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 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 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, and each stator winding is provided with two terminals; the first transfer contact switch and the second transfer contact switch both comprise a common contact and two transfer contacts; 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 first bridge arm midpoint of the first bidirectional DC/AC converter 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 midpoint of the first bidirectional DC/AC converter and a first terminal of the alternating current interface, and two ends of a third stator winding of the first three-phase motor are respectively connected with a third bridge arm midpoint of the first bidirectional DC/AC converter and a common contact of the first conversion contact switch; three terminals of the first three-phase motor, which are connected with the middle points of three bridge arms of the first bidirectional DC/AC converter, are a group of homonymous terminals, and the other three terminals of the first three-phase motor are another group of homonymous terminals;
two ends of a first stator winding of the second three-phase motor are respectively connected with a first bridge arm midpoint of the second bidirectional DC/AC converter and a third terminal of an alternating current interface, two ends of a second stator winding of the second three-phase motor are respectively connected with a second bridge arm midpoint of the second bidirectional DC/AC converter and a third terminal of the alternating current interface, a third stator winding of the second three-phase motor is connected with a third bridge arm midpoint of the second bidirectional DC/AC converter and a common contact of a second change-over contact switch, three terminals connected with three bridge arm midpoints of the second bidirectional DC/AC converter 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 a first terminal and a second terminal of the alternating current interface; the first contact and the second contact of the second transfer contact switch are respectively connected with a third terminal and a second terminal of the alternating current interface.
Further, 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 three-phase motor and the second three-phase motor work in a motor driving mode; 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 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 parallel, the third stator winding of the first three-phase motor and the third stator winding of the second three-phase motor are connected in parallel, and the first stator winding and the second stator winding of the second three-phase motor are connected in parallel.
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 adopts three-phase charging, so that the charging power is improved. And because of using the series topology, the equivalent inductance increases, suitable for the motor of little inductance to use.
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 invention can realize different shaft work when the two three-phase motors do not generate torque during charging. Therefore, the independent use requirement of the engineering machinery walking motor and the hydraulic motor can be realized.
4. Simple structure and low cost.
Compared with the serial connection method, the invention has the advantages that the number of used switches is greatly reduced, and the switching between the motor driving and charging operation modes is simpler.
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 following description will take the first stator winding and the second stator winding of the first three-phase motor in parallel, the third winding of the first three-phase motor in parallel with the third winding of the second three-phase motor, and the first winding and the second winding of the second three-phase motor in parallel as an example.
As shown in fig. 1, the present embodiment discloses a parallel driving and charging integrated circuit of a double three-phase motor applied to an electric engineering machine, 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 and an AC interface 9; the alternating-current side of the first bidirectional DC/AC converter 3 is provided with three bridge arms, namely a first bridge arm, a second bridge arm and a third bridge arm; the second bidirectional DC/AC converter 4 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 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, and each stator winding is provided with two terminals; the first transfer contact switch 7 and the second transfer contact switch 8 comprise a common contact and two transfer contacts, the first contact and the second contact of the first transfer contact switch 7 are respectively b11 and b12, and the first contact and the second contact of the second transfer contact switch 8 are respectively b21 and b22; the alternating current interface 9 is provided with three terminals, namely a first terminal, a second terminal and a third terminal 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 first bridge arm midpoint a11 of the first bidirectional DC/AC converter 3 and a first terminal c1 of the alternating current interface 9, two ends of a second stator winding of the first three-phase motor 5 are respectively connected with a second bridge arm midpoint a12 of the first bidirectional DC/AC converter 3 and a first terminal c1 of the alternating current interface 9, and two ends of a third stator winding of the first three-phase motor 5 are respectively connected with a third bridge arm midpoint a13 of the first bidirectional DC/AC converter 3 and a common contact of the first conversion contact switch 7; the three terminals of the first three-phase motor 5, which are connected with the midpoints a11, a12 and a13 of the three bridge arms of the first bidirectional DC/AC converter 3, are a group of homonymous terminals, and the other three terminals of the first three-phase motor 5 are another group of homonymous terminals;
two ends of a first stator winding of the second three-phase motor 6 are respectively connected with a first bridge arm midpoint a21 of the second bidirectional DC/AC converter 4 and a third terminal c3 of the alternating current interface 9, two ends of a second stator winding of the second three-phase motor 6 are respectively connected with a second bridge arm midpoint a22 of the second bidirectional DC/AC converter 4 and a third terminal c3 of the alternating current interface 9, the third stator winding of the second three-phase motor 6 is connected with a third bridge arm midpoint a23 of the second bidirectional DC/AC converter 4 and a common contact of the second conversion contact switch 8, three terminals connected with three bridge arm midpoints a21, a22 and a23 of the second bidirectional DC/AC converter 4 are one 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 changeover contact switch 7 are connected to the first terminal c1 and the second terminal c2 of the ac interface 9, respectively; the first contact b21 and the second contact b22 of the second changeover contact switch 8 are connected to the third terminal c3 and the second terminal c2 of the ac interface 9, respectively;
the implementation mode of the circuit is as follows: when the first contact b11 of the first changeover contact switch 7 is closed and the second contact b12 is open and the first contact b21 of the second changeover contact switch 8 is closed and the second contact b22 is open, the circuit operates in the motor driving mode as shown in fig. 2; 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 circuit operates in a battery charging mode as shown in fig. 3, at which time the first stator winding and the second stator winding of the first three-phase motor 5 are connected in parallel; the third stator winding of the first three-phase motor 5 is connected in parallel with the third stator winding of the second three-phase motor 6, and the first stator winding and the second stator winding of the second three-phase motor 6 are connected in parallel.
In the battery charging mode, when the input source is a three-phase power grid, three terminals of the ac interface 9 are connected to the three-phase power grid.
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:
i ga ＝I m cosωt
wherein I is m And 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:
i a1 ＝i b1 ＝I m cosωt
performing clark equal power conversion on the above method to obtain:
wherein i is α1 And i β1 The alpha-direction component and the beta-direction component, i, respectively, of the stator winding current of the first three-phase motor 5 α2 And i β2 An alpha direction component and a beta direction component of the stator winding current of the second three-phase motor 6 respectively 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, giveOr->
Similarly, when Park conversion is performed on the second three-phase motor 6, it can be known thatOr->When 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:
T e ＝n p ψ f i q
wherein n is p As the pole pair number of the rotor, ψ f I is the rotor flux linkage q Is the Park converted q-axis current. For the first three-phase motor 5 and the second three-phase motor 6, whenOr->At the time T e =0, 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 DC terminal voltage of the bidirectional DC/AC converter is set to 800V, the terminal voltage of the power battery 1 is 400V, the charging current of the power battery 1 is 100A, and the DC terminal voltage U of the bidirectional DC/AC converter can be seen from FIG. 4 dc Stabilized at 800V, terminal voltage U of power battery 1 b Stabilized at 400V, charging current I of power battery 1 b Stable at 100A, and good tracking effect; 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 three-phase motor 6 agree 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 such as changing the phase sequence of the three-phase motor or the inverter bridge arm 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 (2)
1. Be applied to electric engineering machinery's parallelly connected formula of two three-phase motor drive and fill integrated circuit, its 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) and an alternating current interface (9);
the alternating-current side of the first bidirectional DC/AC converter (3) is provided with three bridge arms, namely a first bridge arm, a second bridge arm and a third bridge arm; the second bidirectional DC/AC converter (4) 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 (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, and each stator winding is provided with two terminals; the first transfer contact switch (7) and the second transfer contact switch (8) both comprise a common contact and two transfer contacts; the alternating current interface (9) 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 first bridge arm midpoint (a 11) of the first bidirectional DC/AC converter (3) and a first terminal (c 1) of the alternating current interface (9), two ends of a second stator winding of the first three-phase motor (5) are respectively connected with a second bridge arm midpoint (a 12) of the first bidirectional DC/AC converter (3) and a first terminal (c 1) of the alternating current interface (9), and two ends of a third stator winding of the first three-phase motor (5) are respectively connected with a third bridge arm midpoint (a 13) of the first bidirectional DC/AC converter (3) and a common contact of the first conversion contact switch (7); three terminals of the first three-phase motor (5) connected with three bridge arm midpoints (a 11), (a 12) and (a 13) of the first bidirectional DC/AC converter (3) are a group of homonymous terminals, and the other three terminals of the first three-phase motor (5) are another group of homonymous terminals;
two ends of a first stator winding of the second three-phase motor (6) are respectively connected with a first bridge arm midpoint (a 21) of the second bidirectional DC/AC converter (4) and a third terminal (c 3) of the alternating current interface (9), two ends of the second stator winding of the second three-phase motor (6) are respectively connected with a second bridge arm midpoint (a 22) of the second bidirectional DC/AC converter (4) and a third terminal (c 3) of the alternating current interface (9), the third stator winding of the second three-phase motor (6) is connected with a common contact of a third bridge arm midpoint (a 23) of the second bidirectional DC/AC converter (4) and a second changeover contact switch (8), three terminals connected with three midpoint bridge arms (a 21), (a 22), (a 23) of the second bidirectional DC/AC converter (4) are one 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 changeover contact switch (7) are respectively connected with a first terminal (c 1) and a second terminal (c 2) of the alternating current interface (9); the first contact (b 21) and the second contact (b 22) of the second changeover contact switch (8) are respectively connected with a third terminal (c 3) and a second terminal (c 2) of the alternating current interface (9);
when a first contact (b 11) of the first transfer contact switch (7) is closed and a second contact (b 12) is opened, a first contact (b 21) of the second transfer contact switch (8) is closed and a second contact (b 22) is opened, the first three-phase motor (5) and the second three-phase motor (6) work in a motor driving mode; when a first contact (b 11) of the first changeover contact switch (7) is opened, a second contact (b 12) is closed, a first contact (b 21) of the second changeover contact switch (8) is opened, and a second contact (b 22) is closed, the circuit works in a battery charging mode, at the moment, a first stator winding and a second stator winding of the first three-phase motor (5) are connected in parallel, a third stator winding of the first three-phase motor (5) is connected in parallel with a third stator winding of the second three-phase motor (6), and a first stator winding and a second stator winding of the second three-phase motor (6) are connected in parallel;
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.
2. The parallel driving and charging integrated circuit for the double three-phase motor of the electric engineering machinery according to claim 1, wherein in the battery charging mode, when the input source is a three-phase power grid, three terminals of the alternating current interface (9) are connected with the three-phase power grid.
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| CN108964561A (en) * | 2018-07-31 | 2018-12-07 | 河南森源重工有限公司 | A kind of control method of double three-phase machine drive system and double three-phase machine |
| 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 |
| CN112803561A (en) * | 2021-01-27 | 2021-05-14 | 华南理工大学 | Electric automobile integrated charging circuit based on auxiliary inductance and three-phase motor drive |
| 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 |
| WO2022160828A1 (en) * | 2021-01-27 | 2022-08-04 | 华南理工大学 | Electric vehicle driving and charging integrated circuit and torque elimination control method thereof |
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| US11936317B2 (en) * | 2021-02-10 | 2024-03-19 | Blue Origin, Llc | Low-voltage fault-tolerant rotating electromechanical actuators, and associated systems and methods |
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| CN108964561A (en) * | 2018-07-31 | 2018-12-07 | 河南森源重工有限公司 | A kind of control method of double three-phase machine drive system and double three-phase machine |
| 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 |
| CN112803561A (en) * | 2021-01-27 | 2021-05-14 | 华南理工大学 | Electric automobile integrated charging circuit based on auxiliary inductance and three-phase motor drive |
| WO2022160828A1 (en) * | 2021-01-27 | 2022-08-04 | 华南理工大学 | Electric vehicle driving and charging integrated circuit and torque elimination control method thereof |
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