CN113183788B - V2G isolation type charger integration method based on open-winding motor - Google Patents

V2G isolation type charger integration method based on open-winding motor Download PDF

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CN113183788B
CN113183788B CN202110442877.6A CN202110442877A CN113183788B CN 113183788 B CN113183788 B CN 113183788B CN 202110442877 A CN202110442877 A CN 202110442877A CN 113183788 B CN113183788 B CN 113183788B
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change
winding
over switch
bridge
output
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CN113183788A (en
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李春杰
陈心雨
李洪美
赵明伟
马红建
柴艳莉
闫俊荣
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Jiangsu Normal University
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Jiangsu Normal University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • 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
    • 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
    • H02P25/18—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 with arrangements for switching the windings, e.g. with mechanical switches or relays
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • Y02T10/64—Electric machine technologies in electromobility
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A V2G isolation type charger integration method based on an open winding motor is characterized in that the open winding motor is used as a filter inductor of the charger, 6 change-over switches are arranged, two working modes of charging and driving are realized through the on-off of the 6 change-over switches, and the bidirectional flow of energy can be realized because all power devices are full-control devices. Compared with the prior art, the integration method only needs to add fewer change-over switches, the motor driving system divides each phase of the three-phase winding into two, the open winding is adopted to operate in the driving mode, and the two windings of each phase are connected in parallel to serve as the filter inductor in the charging mode. The isolated charger can realize the bidirectional transmission of the V2G energy.

Description

V2G isolation type charger integration method based on open-winding motor
Technical Field
The invention relates to the field of charging and driving integrated systems of medium and high power electric automobiles, in particular to V2G isolation type charger integration based on an open winding motor.
Background
Because the on-vehicle machine that charges is installed on electric automobile, so, not only increased electric automobile's volume, weight, still increased whole electric automobile's cost. To solve this problem, an integration technique is introduced. At present, the integrated charger is divided into two categories according to whether it has electrical isolation: the charger comprises an isolation transformer and a charger without the isolation transformer. For medium and high power electric motor coaches, the charging device must be provided with electrical isolation in view of electrical safety.
Currently, there are two integration schemes with isolation transformers: firstly, as shown in fig. 1, a static transformer is formed by using a special motor structure, and is a power frequency transformer, and the loss is large under the power frequency work; secondly, as shown in fig. 2, with the patent grant No. CN104670040B, the charging topology utilizes the electrical isolation of the magnetic combined high-frequency transformer to improve the system safety, and the integrated impedance source driving topology utilizes the magnetic combined high-frequency transformer with three primary windings connected in parallel to greatly improve the voltage boosting capability, wherein the impedance source network needs to be additionally provided with a controllable power tube to realize the bidirectional energy flow. The integrated drive topology has fault tolerance, but the motor is in derated operation. In addition, the scheme has the problems of additional passive devices, more switches, unidirectional energy flow and the like. In order to solve the above-mentioned defects, the present invention provides a charging integration method using a motor winding as a bidirectional flow of energy for charging a filter inductor. The integrated charging converter can realize bidirectional flow (V2G) of energy between the electric automobile and the power grid, and helps the power grid to shift peaks and fill valleys to stabilize the power grid operation. With the application of the V2G technology of the electric automobile, the problems of energy crisis and environmental pollution at present can be effectively relieved, the load peak-valley difference of the power grid can be reduced, and the energy requirement of the power grid can be balanced.
Disclosure of Invention
The invention aims to research an integration method of a V2G isolation type high-power charger based on an open-winding motor, and the integrated converter realizes free switching between a charging mode and a driving mode by adding fewer change-over switches. And controllable tubes are adopted in the integrated converters, so that the energy bidirectional flow of V2G can be realized.
In order to achieve the purpose, the circuit structure of the V2G isolation type charger integration method based on the open-winding motor comprises a first H-bridge type converter, a second H-bridge type converter, a third H-bridge type converter, a first motor winding, a second motor winding, a third motor winding, a first film filter capacitor, a second film filter capacitor, a third film filter capacitor and a magnetic combination high-frequency transformer, wherein two ends of the first electrolytic filter capacitor are respectively connected with the positive electrode and the negative electrode of a storage battery; the device is characterized by also comprising a first change-over switch, a second change-over switch, a third change-over switch and a fourth change-over switch;
the output of the phase A of the power grid is connected with the first end of the input of the first switch;
the phase B output of the power grid is connected with the second end of the input of the first switch;
the C-phase output of the power grid is connected with the third end of the input of the first switching switch;
the power grid midpoint N is connected with the fourth end of the input of the first switch;
the first end of the output of the first switch is connected with the inlet end a of the first phase stator winding of the three-phase motor 0 The winding outlet terminal a 1 The winding outlet end a2 is connected with the end a of the fourth change-over switch;
the output second end of the first switch is connected with the inlet end b of the second phase stator winding of the three-phase motor 0 Winding outlet terminal b 1 The end a of the fifth change-over switch is connected with the winding outlet end b 2 The c end of the fifth change-over switch is connected;
the third end of the output of the first switch is connected with the inlet end c of the third phase stator winding of the three-phase motor 0 Winding outlet terminal c 1 The a end of the sixth change-over switch is connected with the winding outlet end c 2 The end c of the fourth change-over switch is connected;
the fourth end of the output of the first change-over switch is connected with the b end of the sixth change-over switch;
the first input end of the first H-bridge type converter is connected with the c end of the second change-over switch, and the second input end of the first H-bridge type converter is connected with the b end of the second change-over switch;
the first input end of the second H-bridge type converter is connected with the c end of the third change-over switch, and the second input end of the second H-bridge type converter is connected with the b end of the third change-over switch;
the first input end of the third H-bridge type converter is connected with the c end of the fourth selector switch, and the second output end of the third H-bridge type converter is connected with the b end of the fourth selector switch;
b of the second change-over switch is connected with one end of the fifth change-over switch, b of the third change-over switch is connected with two ends of the fifth change-over switch, b of the third change-over switch is connected with one end of the sixth change-over switch, and b of the fourth change-over switch is connected with two ends of the sixth change-over switch;
the first output ends of the first to third H-bridge converters are respectively connected with the first input ends of the fourth to sixth H-bridge converters;
second output ends of the first to third H-bridge converters are respectively connected with second input ends of the fourth to sixth H-bridge converters;
first output ends of the first to third H-bridge type converters are respectively connected with anodes of the first to third film capacitors, and second output ends of the first to third H-bridge type converters are respectively connected with cathodes of the first to third film capacitors;
a first output end of the fourth H-bridge type converter is connected with a first end of a first primary winding of the high-frequency transformer, and a second output end of the fourth H-bridge type converter is connected with a second end of the first primary winding of the high-frequency transformer;
a first output end of the fifth H-bridge converter is connected with a first end of a second primary winding of the high-frequency transformer, and a second output end of the fifth H-bridge converter is connected with a second end of the second primary winding of the high-frequency transformer;
a first output end of the sixth H-bridge converter is connected with a first end of a third primary winding of the high-frequency transformer, and a second output end of the sixth H-bridge converter is connected with a second end of the third primary winding of the high-frequency transformer;
the first end of the secondary winding of the high-frequency transformer is connected with the first input end of the controllable rectifier bridge, and the second end of the secondary winding of the high-frequency transformer is connected with the second input end of the controllable rectifier bridge;
the first output end of the seventh H-bridge converter is connected with the anode of the storage battery, and the second output end of the seventh H-bridge converter is connected with the cathode of the storage battery;
a first output end of the seventh H-bridge converter is connected with the anode of the filter capacitor, and a second output end of the seventh H-bridge converter is connected with the cathode of the filter capacitor;
when the electric automobile is in a charging mode, the ends a of the second to fourth change-over switches are connected with the end c, the first change-over switch is closed, and the fifth change-over switch and the sixth change-over switch are closed;
when the electric automobile is in a driving mode, the ends a and b of the second to fourth change-over switches are connected, the first change-over switch is turned off, and the fifth change-over switch and the sixth change-over switch are turned off.
When the electric automobile is in a driving state, the power battery is rectified and transformed through the isolation type DC-DC converter, and then the three-phase open winding motor is driven to run through the three H-bridge converters in an inversion mode; the isolated DC-DC converter comprises four H-bridge converters, an integrated high-frequency transformer and a film capacitor;
when the electric automobile is in a charging state, three-phase alternating current provided by a power grid is converted into direct current through three controllable H-bridge converters with rectification function, a direct current bus filter capacitor (film capacitor), three H-bridge converters with inversion function, a magnetic combination high-frequency transformer, an output H-bridge converter and the filter capacitor to be supplied to a power battery for charging. In addition, the charging topology has a power factor correction function.
The invention has the advantages that the drive topology of the first to sixth switches is completely reused by the on-off action of the first to sixth switches, and compared with the prior art, the integration method has the following technical effects:
1. because the isolated open winding driving topology is completely multiplexed with the original charging converter, additional power electronic devices are not needed.
2. Both the motor drive system and the charging system have bi-directional flow of energy.
2. The detection device in the control system can be reused, and the hardware cost is reduced.
3. The charging system has electric isolation and is suitable for high-power quick charging.
4. The open-winding motor tap winding is connected in parallel by a magnetic flux balance method to be used as a filter inductor of a charging system, and the motor is static during charging.
Drawings
FIG. 1 is a schematic circuit diagram of a first prior art charging and driving integration scheme for an electric vehicle with an isolation transformer;
FIG. 2 is a schematic circuit diagram of a second conventional charging and driving integration scheme for an electric vehicle with an isolation transformer;
FIG. 3 is a V2G isolation type charger integration method based on an open winding motor, which is provided by the invention;
FIG. 4 is a schematic diagram of the charging topology of the present invention;
FIG. 5 is a schematic diagram of the motor drive topology of the present invention;
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1-5, a circuit structure of a V2G isolation type charger integration method based on an open-winding motor includes first to seventh H-bridge type converters, first to third three-phase motor windings, first to third thin film filter capacitors, and a magnetic combination high-frequency transformer, wherein two ends of the first electrolytic filter capacitor are respectively connected with the positive electrode and the negative electrode of a storage battery; the device is characterized by also comprising a first change-over switch, a second change-over switch, a third change-over switch and a fourth change-over switch;
the output of the phase A of the power grid is connected with the first input end of the first switch;
the phase B output of the power grid is connected with the second end of the input of the first switch;
the C-phase output of the power grid is connected with the third end of the input of the first switching switch;
the power grid midpoint N is connected with the fourth end of the input of the first switch;
the output first end of the first switch is connected with the inlet wire end a of the first phase stator winding of the three-phase motor 0 The winding outlet terminal a 1 The winding outlet end a2 is connected with the end a of the fourth change-over switch;
the output second end of the first switch is connected with the inlet end b of the second phase stator winding of the three-phase motor 0 Winding outlet terminal b 1 The end a of the fifth change-over switch is connected with the winding outlet end b 2 The end c of the fifth change-over switch is connected;
the third end of the output of the first switch is connected with the inlet end c of the third phase stator winding of the three-phase motor 0 Winding outlet terminal c 1 The a end of the sixth change-over switch is connected with the winding outlet end c 2 The end c of the fourth change-over switch is connected;
the fourth output end of the first change-over switch is connected with the b end of the sixth change-over switch;
the first input end of the first H-bridge type converter is connected with the c end of the second change-over switch, and the second input end of the first H-bridge type converter is connected with the b end of the second change-over switch;
the first input end of the second H-bridge type converter is connected with the c end of the third change-over switch, and the second input end of the second H-bridge type converter is connected with the b end of the third change-over switch;
the first input end of the third H-bridge type converter is connected with the c end of the fourth change-over switch, and the second output end of the third H-bridge type converter is connected with the b end of the fourth change-over switch;
b of the second change-over switch is connected with one end of the fifth change-over switch in an end-to-end manner, b of the third change-over switch is connected with two ends of the fifth change-over switch in an end-to-end manner, b of the third change-over switch is connected with one end of the sixth change-over switch in an end-to-end manner, and b of the fourth change-over switch is connected with two ends of the sixth change-over switch in an end-to-end manner;
the first output ends of the first to third H-bridge converters are respectively connected with the first input ends of the fourth to sixth H-bridge converters;
second output ends of the first to third H-bridge converters are respectively connected with second input ends of the fourth to sixth H-bridge converters;
first output ends of the first to third H-bridge type converters are respectively connected with anodes of the first to third film capacitors, and second output ends of the first to third H-bridge type converters are respectively connected with cathodes of the first to third film capacitors;
a first output end of the fourth H-bridge type converter is connected with a first end of a first primary winding of the high-frequency transformer, and a second output end of the fourth H-bridge type converter is connected with a second end of the first primary winding of the high-frequency transformer;
a first output end of the fifth H-bridge converter is connected with a first end of a second primary winding of the high-frequency transformer, and a second output end of the fifth H-bridge converter is connected with a second end of the second primary winding of the high-frequency transformer;
a first output end of the sixth H-bridge converter is connected with a first end of a third primary winding of the high-frequency transformer, and a second output end of the sixth H-bridge converter is connected with a second end of the third primary winding of the high-frequency transformer;
the first end of the secondary winding of the high-frequency transformer is connected with the first input end of the controllable rectifier bridge, and the second end of the secondary winding of the high-frequency transformer is connected with the second input end of the controllable rectifier bridge;
the first output end of the seventh H-bridge converter is connected with the anode of the storage battery, and the second output end of the seventh H-bridge converter is connected with the cathode of the storage battery;
a first output end of the seventh H-bridge converter is connected with the anode of the filter capacitor, and a second output end of the seventh H-bridge converter is connected with the cathode of the filter capacitor;
when the electric automobile is in the charging mode, the ends a of the second to fourth change-over switches are connected with the end c, the first change-over switch is closed, and the fifth change-over switch and the sixth change-over switch are closed. The first to third and seventh H-bridge converters are in a rectification state, and the fourth to sixth H-bridge converters are in an inversion state. Then, the digital processor sends out PWM wave driving signals to supply power tubes of the H-bridge inverter and the rectifier.
When the electric automobile normally runs in the driving mode, the ends a and b of the second to fourth change-over switches are connected, the first change-over switch is turned off, and the fifth change-over switch and the sixth change-over switch are turned off. The first to third and seventh H-bridge converters are in an inversion state, and the fourth to sixth H-bridge converters are in a rectification state. Then, the digital processor sends out PWM wave driving signals to supply power tubes of the H-bridge inverter and the rectifier.
When the electric automobile feeds energy to the power grid, the ends a of the second to fourth change-over switches are connected with the end c, the first change-over switch is closed, and the fifth change-over switch and the sixth change-over switch are closed. The first to third and seventh H-bridge converters are in an inversion state, and the fourth to sixth H-bridge converters are in a rectification state. Then, the digital processor sends out PWM wave driving signals to supply power tubes of the H-bridge inverter and the rectifier.
The alternating current motor is an open winding motor, and a tap is arranged in the middle of each phase of winding.

Claims (6)

1. A V2G isolation type charger integration method based on an open-winding motor is characterized in that a circuit structure of the charger integration method comprises a first H bridge type converter, a second H bridge type converter, a third phase motor winding, a fourth phase motor winding, a fifth phase motor winding, a sixth phase motor winding, a seventh phase motor winding, a sixth phase motor winding, a seventh phase motor winding, a sixth phase motor winding, a seventh phase motor winding, a sixth phase motor winding, a seventh phase motor and a seventh phase motor; the device is characterized by also comprising a first change-over switch, a second change-over switch, a third change-over switch and a fourth change-over switch;
the phase A output of the power grid is connected with the first end of the input of the first switch;
the phase B output of the power grid is connected with the second end of the input of the first switch;
the output of the phase C of the power grid is connected with the input third end of the first switch;
the power grid midpoint N is connected with the fourth end of the input of the first switch;
the first end of the output of the first switch is connected with the inlet end a of the first phase stator winding of the three-phase motor 0 Outlet terminal of windinga 1 The winding outlet end a2 is connected with the end a of the fourth change-over switch;
the output second end of the first switch is connected with the inlet end b of the second phase stator winding of the three-phase motor 0 Winding outlet terminal b 1 The end a of the fifth change-over switch is connected with the winding outlet end b 2 The end c of the fifth change-over switch is connected;
the third end of the output of the first switch is connected with the inlet end c of the third phase stator winding of the three-phase motor 0 Winding outlet terminal c 1 The a end of the sixth change-over switch is connected with the winding outlet end c 2 The end c of the fourth change-over switch is connected;
the fourth end of the output of the first change-over switch is connected with the b end of the sixth change-over switch;
the first input end of the first H-bridge type converter is connected with the c end of the second change-over switch, and the second input end of the first H-bridge type converter is connected with the b end of the second change-over switch;
the first input end of the second H-bridge type converter is connected with the c end of the third change-over switch, and the second input end of the second H-bridge type converter is connected with the b end of the third change-over switch;
the first input end of the third H-bridge type converter is connected with the c end of the fourth selector switch, and the second output end of the third H-bridge type converter is connected with the b end of the fourth selector switch;
b of the second change-over switch is connected with one end of the fifth change-over switch in an end-to-end manner, b of the third change-over switch is connected with two ends of the fifth change-over switch in an end-to-end manner, b of the third change-over switch is connected with one end of the sixth change-over switch in an end-to-end manner, and b of the fourth change-over switch is connected with two ends of the sixth change-over switch in an end-to-end manner;
the first output ends of the first to third H-bridge converters are respectively connected with the first input ends of the fourth to sixth H-bridge converters;
second output ends of the first to third H-bridge converters are respectively connected with second input ends of the fourth to sixth H-bridge converters;
first output ends of the first to third H-bridge type converters are respectively connected with anodes of the first to third film capacitors, and second output ends of the first to third H-bridge type converters are respectively connected with cathodes of the first to third film capacitors;
a first output end of the fourth H-bridge type converter is connected with a first end of a first primary winding of the high-frequency transformer, and a second output end of the fourth H-bridge type converter is connected with a second end of the first primary winding of the high-frequency transformer;
a first output end of the fifth H-bridge converter is connected with a first end of a second primary winding of the high-frequency transformer, and a second output end of the fifth H-bridge converter is connected with a second end of the second primary winding of the high-frequency transformer;
a first output end of the sixth H-bridge converter is connected with a first end of a third primary winding of the high-frequency transformer, and a second output end of the sixth H-bridge converter is connected with a second end of the third primary winding of the high-frequency transformer;
the first end of the secondary winding of the high-frequency transformer is connected with the first input end of the controllable rectifier bridge, and the second end of the secondary winding of the high-frequency transformer is connected with the second input end of the controllable rectifier bridge;
the first output end of the seventh H-bridge converter is connected with the anode of the storage battery, and the second output end of the seventh H-bridge converter is connected with the cathode of the storage battery;
the first output end of the seventh H-bridge converter is connected with the anode of the filter capacitor, and the second output end of the seventh H-bridge converter is connected with the cathode of the filter capacitor;
when the electric automobile is in a charging mode, the ends a of the second to fourth change-over switches are connected with the end c, the first change-over switch is closed, and the fifth change-over switch and the sixth change-over switch are closed;
when the electric automobile is in a driving mode, the ends a and b of the second to fourth change-over switches are connected, the first change-over switch is turned off, and the fifth change-over switch and the sixth change-over switch are turned off.
2. The V2G isolation-type charger integration method based on the open-winding motor according to claim 1, characterized in that the alternating current motor is an open-winding motor, and a tap is arranged in the middle of each phase winding.
3. The V2G isolation-type charger integration method based on the open-winding motor according to claim 1, wherein the first through seventh H-bridge converters are fully-controlled power devices.
4. The V2G isolation-type charger integration method based on the open-winding motor of claim 1, wherein the motor winding is used as a filter inductor of a charging topology.
5. The V2G isolation type charger integration method based on the open-winding motor according to claim 1, characterized in that the first to third filter capacitors in the charging topology are thin film capacitors.
6. The V2G isolation-type charger integration method based on the open-winding motor according to claim 1, characterized in that the transformer is a high-frequency transformer.
CN202110442877.6A 2021-04-23 2021-04-23 V2G isolation type charger integration method based on open-winding motor Active CN113183788B (en)

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