CN110768521A - Bidirectional high-frequency auxiliary converter system - Google Patents
Bidirectional high-frequency auxiliary converter system Download PDFInfo
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- CN110768521A CN110768521A CN201810842446.7A CN201810842446A CN110768521A CN 110768521 A CN110768521 A CN 110768521A CN 201810842446 A CN201810842446 A CN 201810842446A CN 110768521 A CN110768521 A CN 110768521A
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- 238000006243 chemical reaction Methods 0.000 claims description 15
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/53—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells in combination with an external power supply, e.g. from overhead contact lines
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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
- B60L9/00—Electric propulsion with power supply external to the vehicle
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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a bidirectional high-frequency auxiliary converter system which comprises a main circuit, a traction middle direct current bus, a power storage battery and a control unit, wherein the traction middle direct current bus, the power storage battery and the control unit are respectively connected with the main circuit. The main circuit is used for carrying out bidirectional transmission on electric quantity between the traction intermediate direct current bus and the power storage battery; the traction intermediate direct current bus is used for carrying out bidirectional transmission on electric quantity between the traction motor and the main circuit; the power storage battery is used for carrying out emergency power supply on the traction motor and the load; and the control unit is used for controlling and detecting the working state of the main circuit. The main circuit is set to transmit the electric quantity between the traction intermediate direct current bus and the power storage battery in a bidirectional way, so that when the vehicle-mounted pantograph is in normal operation, energy is charged for the power storage battery and supplies power for a load through the traction direct current bus and the main circuit, and when the vehicle-mounted pantograph is disconnected, the power storage battery can supply power for the traction motor and the load through the main circuit, so that bidirectional high-frequency auxiliary current transformation is realized.
Description
Technical Field
The invention relates to a vehicle-mounted power system, in particular to a bidirectional high-frequency auxiliary converter system capable of meeting the requirement of emergency traction of a storage battery.
Background
With the generalization of high-speed rail of automobiles, rail transit has become a popular mode of transportation. The conventional vehicle-mounted auxiliary converter system for the rail transit has the problems of large volume, low power density and the like, energy of the conventional vehicle-mounted auxiliary converter system for the rail transit can only be transmitted in a single direction, namely, the energy can only be charged for a storage battery and supplies power for a load through a traction direct current bus and the auxiliary converter system, and the energy cannot flow in the reverse direction.
The existing high-frequency auxiliary converter system adopts the arrangement of a preceding stage chopping and LLC resonant converter to replace the traditional power frequency auxiliary converter system, thereby reducing the volume and weight of the system, improving the power density and realizing the requirement of light weight. However, the existing high-frequency auxiliary converter system can only realize unidirectional flow of energy, i.e. the energy can only be charged for the storage battery and supplied for a load through a traction direct-current bus by the high-frequency auxiliary converter system, and the energy cannot flow reversely. And the used low-voltage storage battery can only supply power for a control circuit and a load due to the limitation of capacity and discharge rate, and cannot directly supply energy for the traction motor. If emergency power supply is to be provided for the traction motor when the pantograph is powered off, the following conditions need to be met: the emergency traction power is far larger than the normal power supply power, the emergency traction frequency is low, and the volume space of the train is limited, so the bidirectional converter system has high power density, and the existing vehicle-mounted auxiliary converter system cannot meet the requirements.
Therefore, a vehicle-mounted bidirectional high-frequency auxiliary converter system satisfying high power, high frequency, high power density, high efficiency and light weight is needed.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional vehicle-mounted auxiliary converter system cannot realize bidirectional energy transfer, so that emergency energy cannot be provided for a traction motor when a vehicle-mounted bow net is powered off.
In order to solve the technical problem, the invention provides a bidirectional high-frequency auxiliary converter system which comprises a main circuit, a traction middle direct current bus and a power storage battery, wherein the traction middle direct current bus and the power storage battery are respectively connected with the main circuit; wherein,
the main circuit comprises two paths of bidirectional isolation DC/DC converters and is used for realizing bidirectional transmission of electric quantity between the traction intermediate direct current bus and the power storage battery and providing electric quantity for a load;
the traction intermediate direct current bus is used for realizing bidirectional transmission of electric quantity between the traction motor and the main circuit;
and the power storage battery is used for carrying out emergency power supply on the traction motor and the load through the main circuit.
Preferably, the main circuit includes:
the bidirectional high-frequency isolated DC/DC module is used for realizing bidirectional high-frequency isolated DC conversion;
and one end of the bidirectional multiple chopper is connected with the bidirectional high-frequency isolated DC/DC module, and the other end of the bidirectional multiple chopper is connected with the power storage battery and is used for charging and discharging the power storage battery.
Preferably, the bidirectional high-frequency isolation type DC/DC module includes a three-level buck-boost circuit and two bidirectional isolation DC/DC converters having primary sides connected in series and secondary sides connected in parallel, and the primary sides of the two bidirectional isolation DC/DC converters are connected in series and then connected to the three-level buck-boost circuit.
Preferably, the main circuit further includes:
and one end of the unidirectional charger is connected with the secondary side of the two-way bidirectional isolation DC/DC converter, and the other end of the unidirectional charger is used for connecting a direct current load and/or a direct current storage battery.
Preferably, the one-way charger comprises a DC/DC converter.
Preferably, the main circuit further includes:
and one end of the three-phase inverter is connected with the secondary side of the two-way bidirectional isolation DC/DC converter, and the other end of the three-phase inverter is connected with an alternating current load.
Preferably, the main circuit further includes:
and one end of the unidirectional charger is connected with the output end of the three-phase inverter, and the other end of the unidirectional charger is used for connecting a direct-current load and/or a direct-current storage battery.
Preferably, the unidirectional charger comprises an uncontrolled rectifying circuit and a DC/DC converter which are connected in series, wherein the input end of the uncontrolled rectifying circuit is connected with the output end of the three-phase inverter, and the output end of the DC/DC converter is used for connecting a direct-current load and/or a direct-current storage battery.
Preferably, the control device further comprises a control unit which comprises a microcomputer control unit, an isolation driving unit and a sensor detection circuit, wherein the microcomputer control unit is connected with the main circuit through the isolation driving unit, the sensor detection circuit is respectively connected with the microcomputer control unit and the main circuit, the sensor detection circuit is used for detecting the main circuit and transmitting a detection result to the microcomputer control unit, and the microcomputer control unit is used for controlling the main circuit according to the detection result.
Preferably, the microcomputer control unit controls the bidirectional isolation DC/DC converter, the bidirectional multiple chopper circuit, and the three-level buck-boost circuit in the main circuit by a phase-staggered control method.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the bidirectional high-frequency auxiliary current transformation system provided by the embodiment of the invention, the main circuit is set to realize bidirectional transmission of electric quantity between the traction middle direct current bus and the power storage battery, so that when the vehicle-mounted pantograph is in normal operation, energy is charged for the power storage battery and supplies power for a load through the traction direct current bus and the main circuit, and when the vehicle-mounted pantograph is disconnected, the power storage battery can supply power for the traction motor and the load through the main circuit, so that bidirectional high-frequency auxiliary current transformation is realized. Meanwhile, a three-level buck-boost circuit in the bidirectional high-frequency isolation type DC/DC module realizes power bidirectional conversion, and multi-level phase-staggered control is adopted, so that the voltage and current stress can be reduced, and the working capacity under the condition of wide input of the circuit is improved; the bidirectional isolation DC/DC converter in the bidirectional high-frequency isolation type DC/DC module realizes bidirectional power conversion, soft switching in a full-load range is realized in both forward and reverse directions, conversion efficiency is improved, and the utilization efficiency of a power storage battery in emergency power supply is improved. The method and the device adopt a multi-level technology, a multi-circuit technology and a soft switching technology to further improve the working frequency of the bidirectional converter, reduce the volume of a system and improve the power density of the system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a bidirectional high-frequency auxiliary variable current system according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of a specific structure of the bidirectional high-frequency auxiliary variable flow system in fig. 1.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
The conventional vehicle-mounted high-frequency auxiliary converter system for rail transit generally can only realize unidirectional flow of energy, namely the energy can only be used for charging a storage battery and supplying power to a load through a traction direct-current bus and the high-frequency auxiliary converter system, and the energy cannot flow reversely. And the used low-voltage storage battery can only supply power for a control circuit and a load due to the limitation of capacity and discharge rate, and cannot directly supply energy for the traction motor. If emergency power supply is required to be provided for a traction motor when the pantograph is powered off, the emergency traction power is far higher than the normal power supply power, the emergency traction frequency is low, and the volume space of a train is limited, so that the bidirectional converter system has high power density, and the conventional vehicle-mounted auxiliary converter system cannot meet the requirements.
Example one
In order to solve the above technical problems in the prior art, an embodiment of the present invention provides a bidirectional high-frequency auxiliary converter system.
Fig. 1 shows a schematic structural diagram of a bidirectional high-frequency auxiliary variable current system according to an embodiment of the present invention. Referring to fig. 1, the bidirectional high-frequency auxiliary converter system of the present embodiment includes a main circuit, a traction intermediate dc bus, a power storage battery, and a control unit, where the main circuit is connected to the traction intermediate dc bus, the power storage battery, and the control unit, respectively.
The main circuit is used for carrying out bidirectional transmission on electric quantity between the traction middle direct current bus and the power storage battery and providing electric quantity for a load. Specifically, when the pantograph net normally supplies power, the main circuit outputs the electric quantity for drawing the middle direct current bus to the power storage battery and provides the electric quantity for the load; when the pantograph is powered off, the power storage battery sequentially passes through the main circuit and the traction middle direct current bus to provide electric quantity for the traction motor and the load.
Furthermore, the main circuit comprises a bidirectional high-frequency isolation type DC/DC module, a three-phase inverter and a bidirectional multiple chopper, wherein one end of the bidirectional high-frequency isolation type DC/DC module is respectively connected with the three-phase inverter and the bidirectional multiple chopper. The bidirectional high-frequency isolated DC/DC module is used for performing high-frequency high-efficiency bidirectional high-frequency isolated DC/DC conversion on electric quantity, so that energy of an auxiliary system can flow in two directions, and further the emergency traction and auxiliary power supply functions of the power storage battery when the pantograph is powered off are realized. The three-phase inverter circuit is used for converting direct-current voltage into three-phase power frequency alternating-current voltage so as to provide alternating current for a load. The three-phase inverter circuit mainly inverts the intermediate direct current DC700V into three-phase power frequency alternating current voltage AC380V to supply power for alternating current auxiliary equipment such as train fans, air compressors, air conditioners and the like and a one-way charger; the three-phase four-wire system is adopted, power can be supplied to a three-phase unbalanced load or a single-phase load, and the three-phase four-wire system is realized through a split capacitor type, an autotransformer type and a four-bridge arm type. The bidirectional multiple chopper is a bidirectional non-isolated DC/DC converter, realizes the function of a bidirectional charger, is controlled by multiple circuits in a staggered way, reduces output current pulsation and current stress, improves the charging and discharging control precision, and realizes the high-rate discharge of the power storage battery; the bidirectional multiple choppers form a bidirectional charger for charging and discharging the power storage battery; the system works in a forward voltage reduction mode when in normal power supply, the input of the system is intermediate bus voltage DC700V, and the output of the system is used for charging a power storage battery; when the emergency traction power supply is carried out, the emergency traction power supply works in a reverse boosting mode, the input of the emergency traction power supply is connected with a power storage battery, and the output DC700V voltage of the emergency traction power supply is used as the input of a bidirectional high-frequency isolation type DC/DC module and a three-phase auxiliary inverter.
Furthermore, the bidirectional high-frequency isolation type DC/DC module comprises a three-level buck-boost circuit and two bidirectional isolation DC/DC converters with primary sides connected in series and secondary sides in parallel, one end of the three-level buck-boost circuit is connected with the primary sides of the two bidirectional isolation DC/DC converters, and the other end of the three-level buck-boost circuit is used as one input end or one output end of the bidirectional high-frequency isolation type DC/DC module and is connected with the traction middle direct current bus; and the secondary side of the two-way bidirectional isolation DC/DC converters is used as the other input end or the output end of the bidirectional high-frequency isolation type DC/DC module and is connected with the input end of the three-phase inverter and one end of the bidirectional multiple chopper. The three-level buck-boost circuit is a bidirectional non-isolated DC/DC converter, power bidirectional conversion is realized, multi-level phase-staggered control is adopted, voltage and current stress can be reduced, and the working capacity of the circuit under the condition of wide input is improved; the bidirectional isolation DC/DC converter works in a forward three-level step-down mode during normal power supply, the input of the bidirectional isolation DC/DC converter is traction DC bus voltage DC3600V, and the output of the bidirectional isolation DC/DC converter is used as the input of the bidirectional isolation DC/DC converter; the three-level boost circuit can reduce the voltage stress of a chopper circuit and the current stress of the circuit.
The bidirectional isolation DC/DC converter can be a bidirectional LLC resonant converter or a double-active-bridge converter (DAB) or other high-frequency isolation type DC/DC converters, bidirectional conversion of power is achieved, soft switching in a full-load range is achieved in both forward and reverse directions, switching loss is reduced, conversion efficiency is improved, and particularly utilization efficiency of a power storage battery in emergency power supply is improved. And the primary sides of the two-way isolation DC/DC converters are connected in series, the secondary sides are connected in parallel, and the phase-staggered control is adopted. The power supply circuit works in a forward mode during normal power supply, the input of the power supply circuit is the output of the three-level buck-boost circuit, and the output of the power supply circuit is DC700V bus voltage; the emergency traction power supply works in a reverse mode, the input of the emergency traction power supply is the output DC700V of the bidirectional multiple chopper circuit, and the output of the emergency traction power supply is used as the input of the three-level buck-boost circuit. The three-level buck-boost technology can reduce the voltage stress of the chopper circuit and can also reduce the current stress of the circuit; the three-level buck-boost circuit and the bidirectional isolation DC/DC converter jointly realize the bidirectional energy flow of the auxiliary system.
The traction intermediate direct current bus is used for carrying out bidirectional transmission on electric quantity between the traction motor and the main circuit; the power storage battery is used for carrying out emergency power supply on the traction motor and the load.
The control unit is used for controlling and detecting the working state of the main circuit. The microcomputer control unit is connected with the main circuit through the isolation driving unit, and controls the working state of the main circuit by controlling elements in the main circuit. The control unit also comprises a sensor detection circuit which is respectively connected with the microcomputer control unit and the main circuit and used for detecting the working state of each element in the main circuit and sending the detection result to the microcomputer control unit, and the microcomputer control unit analyzes the detection result and controls the working state of the main circuit according to the analysis result. The microcomputer control unit controls the bidirectional isolation DC/DC converter, the bidirectional multiple chopper circuit and the three-level buck-boost circuit by a phase-staggered control method. The microcomputer control unit also has the functions of storing and allowing downloading of the detection result.
The load comprises an alternating current load, a direct current load and a direct current storage battery, and the alternating current load is connected with the output end of the three-phase inverter.
The main circuit further comprises a one-way charger which is used for supplying power to the train direct-current equipment, specifically a direct-current load and a direct-current storage battery. The three-phase non-controlled rectifier and half-bridge circuit or full-bridge circuit can be adopted, and the three-phase non-controlled rectifier and half-bridge circuit or full-bridge circuit can be designed into a hard switch or soft switch mode. Preferably, the unidirectional charger comprises an uncontrolled rectifying circuit and a DC/DC converter which are connected in series, wherein an input end of the uncontrolled rectifying circuit is used as an input end of the unidirectional charger, and an output end of the DC/DC converter is used as an output end of the unidirectional charger. Wherein, the DC/DC converter is a direct current DC/DC converter. The input end of the uncontrolled rectifying circuit is connected with the output end of the three-phase inverter; the output end of the DC/DC converter is respectively connected with the direct current load and the direct current storage battery. Preferably, the direct current storage battery is a 110V storage battery. The direct current storage battery can supply power for the control unit and can also supply power for the direct current load when the pantograph is powered off.
In order to further explain the structure of the bidirectional high-frequency auxiliary converter system and the working state during working, an implementation structure of the bidirectional high-frequency auxiliary converter system is listed below; as shown in fig. 2, fig. 2 shows a specific structural diagram of the bidirectional high-frequency auxiliary variable current system in fig. 1, which is described in detail with reference to fig. 2.
The bidirectional high-frequency auxiliary converter system comprises a main circuit 10, a control unit 20, a power storage battery 12 and a load 30. The main circuit 10 comprises a bidirectional high-frequency isolation type DC/DC module 11, a three-phase inverter 5, a bidirectional multiple chopper 4 and a unidirectional charger 6; the bidirectional high-frequency isolation type DC/DC module 11 comprises a three-level buck-boost circuit 1 and bidirectional isolation DC/DC converters 2 and 3. The primary sides of the two-way isolation DC/DC converters 2 and 3 are connected in series and in parallel, the primary sides of the two-way isolation DC/DC converters 2 and 3 are connected with the three-level lifting piezoelectric transformer 1, and when power is normally supplied, the two-way high-frequency isolation type DC/DC module 11 converts a traction middle direct current bus voltage DC3600V into an auxiliary middle direct current bus voltage DC700V to supply power for the three-phase inverter 5 and the two-way multiple chopper 4; during emergency power supply, the power storage battery 12 discharges to the DC700V auxiliary intermediate direct-current bus through the bidirectional multiple chopper 4, a part of energy is converted into traction intermediate direct-current bus voltage DC3600V through the bidirectional high-frequency isolation type DC/DC module 11, and power is supplied to a traction motor when the pantograph is powered off; the other part of energy supplies power to the train load and the control circuit through a three-phase inverter 5 and a one-way charger 6. The output power of the bidirectional high-frequency isolation type DC/DC module is 220 kW.
The loads include an ac load 13, a dc load 15, and a dc battery 14. The three-phase inverter 5 is used for inverting the voltage of the auxiliary intermediate direct-current bus DC700V into a three-phase power frequency alternating-current voltage AC380V to supply power to the alternating-current load 13 in normal power supply or emergency power supply. In the same way, the unidirectional charger 6 is used for converting the three-phase power frequency alternating current voltage AC380V into 110V direct current to supply power to the direct current storage battery 14 and the direct current load 15 no matter in normal power supply or emergency power supply.
The control unit comprises a microcomputer control unit 8, an isolation drive unit 7 and a sensor detection circuit 9. The microcomputer control unit 8 controls the working state of the main circuit 10 through the isolation driving unit 7, so that the pantograph can normally transmit electric quantity during normal work and emergency work. And the sensor detection circuit 9 is connected with each element in the main circuit 10 to detect the working state of each element, and simultaneously sends the detected working state signal of each element to the microcomputer control unit 8, so that the microcomputer control unit 8 can analyze the working state signal and further control the main circuit according to the analysis result.
In fig. 2, 16+ is a traction intermediate DC bus DC3600V +; 16-is a traction intermediate direct current bus DC 3600V-; 17+ is an auxiliary intermediate direct current bus DC700V +; 17-is an auxiliary intermediate direct current bus DC 700V-; 18A is the phase A of the power frequency AC380V output by the three-phase inverter; 18B is phase B of the three-phase inverter output power frequency alternating current AC 380V; 18C is a C phase of the power frequency AC380V output by the three-phase inverter; 18N is an N phase of the power frequency alternating current AC380V output by the three-phase inverter; 19+ is a direct current bus DC110V + output by the unidirectional charger; 19-outputting a direct current bus DC 110V-for the unidirectional charger; 20+ is a power battery bus DC650V +; 20-is power storage battery bus DC 650V-.
By applying the bidirectional high-frequency auxiliary current transformation system provided by the embodiment of the invention, the main circuit is set to realize bidirectional transmission of electric quantity between the traction intermediate direct current bus and the power storage battery, so that when the vehicle-mounted pantograph is in normal operation, energy is charged for the power storage battery and supplies power for a load through the traction direct current bus and the main circuit, and when the vehicle-mounted pantograph is disconnected, the power storage battery can supply power for the traction motor and the load through the main circuit, so that bidirectional high-frequency auxiliary current transformation is realized. Meanwhile, a three-level buck-boost circuit in the bidirectional high-frequency isolation type DC/DC module realizes power bidirectional conversion, and multi-level phase-staggered control is adopted, so that the voltage and current stress can be reduced, and the working capacity under the condition of wide input of the circuit is improved; the bidirectional isolation DC/DC converter in the bidirectional high-frequency isolation type DC/DC module realizes bidirectional power conversion, soft switching in a full-load range is realized in both forward and reverse directions, conversion efficiency is improved, and the utilization efficiency of a power storage battery in emergency power supply is improved. The method and the device adopt a multi-level technology, a multi-circuit technology and a soft switching technology to further improve the working frequency of the bidirectional converter, reduce the volume of a system and improve the power density of the system.
Example two
In order to solve the above technical problems in the prior art, an embodiment of the present invention further provides another bidirectional high-frequency auxiliary converter system. The system of the embodiment is modified on the basis of the first embodiment.
The main circuit further comprises a one-way charger which is used for supplying power to train direct-current equipment, specifically a direct-current load and a direct-current storage battery. The three-phase non-controlled rectifier and half-bridge circuit or full-bridge circuit can be adopted, and the three-phase non-controlled rectifier and half-bridge circuit or full-bridge circuit can be designed into a hard switch or soft switch mode. Preferably, the unidirectional charger includes a DC/DC converter, an input terminal of the DC/DC converter is used as an input terminal of the unidirectional charger, and an output terminal of the DC/DC converter is used as an output terminal of the unidirectional charger. Wherein, the DC/DC converter is a direct current DC/DC converter. The input end of the DC/DC converter is connected with the output end of the bidirectional high-frequency isolation type DC/DC module; the output end of the DC/DC converter is respectively connected with the direct current load and the direct current storage battery. Namely, the unidirectional charger gets electricity from the auxiliary middle direct current bus DC700V, so that an uncontrolled rectifying circuit can be omitted, the input range is small, and parameter design and device type selection are facilitated. Preferably, the direct current storage battery is a 110V storage battery. The direct current storage battery can supply power for the control unit and can also supply power for the direct current load when the pantograph is powered off.
In the corresponding first embodiment, the unidirectional chargers at other positions are all DC/DC converters, and are all connected with the output end of the bidirectional high-frequency isolation type DC/DC module to provide electric quantity for the direct-current load and the direct-current storage battery.
Other elements of the bidirectional high-frequency auxiliary variable current system are the same as those in the first embodiment, and therefore, the description thereof is omitted here.
By applying the bidirectional high-frequency auxiliary current transformation system provided by the embodiment of the invention, the main circuit is set to realize bidirectional transmission of electric quantity between the traction intermediate direct current bus and the power storage battery, so that when the vehicle-mounted pantograph is in normal operation, energy is charged for the power storage battery and supplies power for a load through the traction direct current bus and the main circuit, and when the vehicle-mounted pantograph is disconnected, the power storage battery can supply power for the traction motor and the load through the main circuit, so that bidirectional high-frequency auxiliary current transformation is realized. Meanwhile, a three-level buck-boost circuit in the bidirectional high-frequency isolation type DC/DC module realizes power bidirectional conversion, and multi-level phase-staggered control is adopted, so that the voltage and current stress can be reduced, and the working capacity under the condition of wide input of the circuit is improved; the bidirectional isolation DC/DC converter in the bidirectional high-frequency isolation type DC/DC module realizes bidirectional power conversion, soft switching in a full-load range is realized in both forward and reverse directions, conversion efficiency is improved, and the utilization efficiency of a power storage battery in emergency power supply is improved. The method and the device adopt a multi-level technology, a multi-circuit technology and a soft switching technology to further improve the working frequency of the bidirectional converter, reduce the volume of a system and improve the power density of the system.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A bidirectional high-frequency auxiliary converter system is characterized by comprising a main circuit, a traction middle direct current bus and a power storage battery, wherein the traction middle direct current bus and the power storage battery are respectively connected with the main circuit; wherein,
the main circuit comprises two paths of bidirectional isolation DC/DC converters and is used for realizing bidirectional transmission of electric quantity between the traction intermediate direct current bus and the power storage battery and providing electric quantity for a load;
the traction intermediate direct current bus is used for realizing bidirectional transmission of electric quantity between the traction motor and the main circuit;
and the power storage battery is used for carrying out emergency power supply on the traction motor and the load through the main circuit.
2. The variable flow system according to claim 1, wherein the main circuit comprises:
the bidirectional high-frequency isolated DC/DC module is used for realizing bidirectional high-frequency isolated DC conversion;
and one end of the bidirectional multiple chopper is connected with the bidirectional high-frequency isolated DC/DC module, and the other end of the bidirectional multiple chopper is connected with the power storage battery and is used for charging and discharging the power storage battery.
3. The variable flow system according to claim 2, wherein the bidirectional high-frequency isolated DC/DC module comprises a three-level buck-boost circuit and two-way bidirectional isolated DC/DC converters having primary sides connected in series and secondary sides connected in parallel, wherein the primary sides of the two-way bidirectional isolated DC/DC converters are connected in series and then connected to the three-level buck-boost circuit.
4. The variable flow system of claim 3, wherein the main circuit further comprises:
and one end of the unidirectional charger is connected with the secondary side of the two-way bidirectional isolation DC/DC converter, and the other end of the unidirectional charger is used for connecting a direct current load and/or a direct current storage battery.
5. The variable flow system of claim 4, wherein the unidirectional charger comprises a DC/DC converter.
6. The variable flow system of claim 3, wherein the main circuit further comprises:
and one end of the three-phase inverter is connected with the secondary side of the two-way bidirectional isolation DC/DC converter, and the other end of the three-phase inverter is connected with an alternating current load.
7. The variable flow system of claim 6, wherein the main circuit further comprises:
and one end of the unidirectional charger is connected with the output end of the three-phase inverter, and the other end of the unidirectional charger is used for connecting a direct-current load and/or a direct-current storage battery.
8. The variable flow system of claim 7, wherein the unidirectional charger comprises an uncontrolled rectifying circuit and a DC/DC converter connected in series, wherein an input end of the uncontrolled rectifying circuit is connected to an output end of the three-phase inverter, and an output end of the DC/DC converter is used for connecting a direct current load and/or a direct current storage battery.
9. The variable flow system according to claim 1, further comprising a control unit including a microcomputer control unit, an isolation driving unit, and a sensor detection circuit, wherein the microcomputer control unit is connected to the main circuit through the isolation driving unit, the sensor detection circuit is respectively connected to the microcomputer control unit and the main circuit, the sensor detection circuit is configured to detect the main circuit and transmit a detection result to the microcomputer control unit, and the microcomputer control unit is configured to control the main circuit according to the detection result.
10. The variable current system according to claim 9, wherein the microcomputer control unit controls the bidirectional isolated DC/DC converter, the bidirectional multiple chopper circuit, and the three-level buck-boost circuit in the main circuit by a phase-error control method.
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| CN201810842446.7A CN110768521A (en) | 2018-07-27 | 2018-07-27 | Bidirectional high-frequency auxiliary converter system |
| PCT/CN2018/111155 WO2020019540A1 (en) | 2018-07-27 | 2018-10-22 | Bidirectional high-frequency auxiliary conversion system |
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| CN201810842446.7A CN110768521A (en) | 2018-07-27 | 2018-07-27 | Bidirectional high-frequency auxiliary converter system |
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| WO (1) | WO2020019540A1 (en) |
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