CN114244088A - Main circuit of internal electric double-source traction converter - Google Patents
Main circuit of internal electric double-source traction converter Download PDFInfo
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/42—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
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/02—Details of the control
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Abstract
The invention discloses a main circuit of an internal electric double-source traction converter, and relates to the field of traction converters of high-speed trains. The main circuit integrates internal combustion and power supply; a main circuit is simplified by adopting a double-tube four-quadrant module and an inversion and chopping module; the whole traction converter adopts the same power module, and the four-quadrant rectification, three-phase uncontrolled rectification and traction inversion and chopping functions are realized through a busbar in a traction converter cabinet body; through different combinations of the input end related contactors, the same power module can realize four-quadrant rectification under the power grid power supply working condition and three-phase uncontrolled rectification under the internal combustion main power generation and supply working condition; the main circuit adopts two integral three inversions, two four-quadrant rectification inputs and outputs are connected in parallel, and double control is adopted, so that the total harmonic current on the network voltage side can be effectively reduced; the voltage grade of DC3600V is adopted, the current of a main loop is reduced, a component suitable for a high altitude of 5100m is adopted, a plateau application environment is realized, and the volume and the weight of a finished automobile and a traction converter are reduced; has obvious economic and social benefits.
Description
Technical Field
The invention relates to the field of traction converters of high-speed trains, in particular to a main circuit of an internal electric double-source traction converter.
Background
With the further enhancement of economic strength in China and the high-speed development of medium and high-speed motor cars and locomotives; meanwhile, in order to further improve places with extremely severe natural environments such as remote places, deserts, mountains, plateaus and the like, particularly improve the passenger and freight transport capacity of the Sichuan-Tibet region, and solve the problem that the same train is operated in a mixed mode on an electrified railway line and a non-electrified railway line; meanwhile, the important principle and the starting foothold are taken for promoting improvement of the civilian and the civilian-enriched storage of the Sichuan-Tibet railway line, long-term establishment and storage and people-centered agglomeration; or cause the big face of contact net to break off at adverse natural environment (weather contact net such as sleet freezes, causes the outage of large tracts of land contact net), when electric power can't pull, adopt the diesel engine that is applicable to plateau application environment to pull and mainly send out and produce three-phase alternating current, pull through interior electric double-source power traction converter, can implement emergency rescue, guarantee the normal operating of passenger, goods and vehicles, ensure the safety of railway transportation.
At present, the traction modes of the locomotive are mainly divided into 3 types: one of the electric locomotives adopts 1 single electric locomotive; the second adopts 1 independent diesel locomotive; and thirdly, adopting 1 electric locomotive +1 internal combustion locomotive to carry out reconnection traction. The main circuits of the traction converter assembled by the traction converter are either independently connected with a catenary to supply power for traction or independently internally-combusted main circuits are used for generating power for traction, the main circuits of the traction converter in 2 power supply modes are independent, and the main circuits in the internal-combusted and power dual-source power supply modes are not integrated together. Therefore, the following disadvantages exist: the locomotive power supply system has the advantages that firstly, a single locomotive cannot adopt an internal combustion and electric power dual-source power supply mode, and a main circuit integrating internal power and electric power is not realized; and secondly, whether a contact net is independently adopted for power supply or a diesel engine is independently adopted for dragging a main generator for power supply, the redundancy of the system is poor and the autonomous rescue performance is poor in severe weather.
The main circuit of the existing technical scheme is mainly designed based on different power sources. The contact network is adopted for power supply, four-quadrant rectification is mainly adopted for providing middle direct-current bus voltage, and a controllable device IGBT is adopted as a power device; the diesel engine is adopted to drive the main generator to supply power, three-phase uncontrolled rectification is mainly adopted, and uncontrolled device diodes are adopted as power devices; the original main circuit design can not realize the four-quadrant rectification and three-phase uncontrolled rectification functions simultaneously, the alternating current-to-direct current parts of the power mode and the internal combustion mode need to adopt different circuits and need different power modules to realize the functions, so that the four-quadrant rectification power module and the three-phase uncontrolled rectification module in the traction converter with different power supply modes have no simplification in the main circuit design of the inverse chopping power module, multiple module types, multiple spare types, high stock spare parts and high maintenance cost.
At present, a 'renaming number' internal electricity double-source motor train unit suitable for a high-altitude 5100m operating environment adopts two ends to respectively compile and hang an electric power vehicle and an internal combustion power vehicle, the number of the power vehicles is 2, and the highest working voltage is DC 2400V. If the future internal electricity dual-source power is integrated with one locomotive, the bus adopting the voltage of the same level cannot be easily realized in terms of volume and weight; the Rexing signal does not have a DC3600V bus voltage suitable for the operation environment of 5100m at high altitude.
Therefore, for the reasons, it is very important to design a traction converter main circuit which is suitable for high altitude, integrates internal power and dual power sources, is simplified in power module, and is low in operation and maintenance cost.
Disclosure of Invention
The invention provides a main circuit of an internal electric double-source traction converter, aiming at solving the problem of integration of electric power and internal combustion double-source power supply at high altitude.
The invention is realized by the following technical scheme: a main circuit of an internal power double-source traction converter comprises a PMCF1 four-quadrant power supply circuit, a PMCF2 four-quadrant power supply circuit, a main generator power supply circuit, an intermediate circuit and a traction inverter chopper circuit; the PMCF1 four-quadrant power supply circuit comprises a traction transformer TR-1, a pre-charging contactor AK1, a pre-charging resistor CHR1, a main contactor K11, a four-quadrant input current sensor CT (IN)1, an internal power supply conversion isolation contactor K12 and a PMCF1 rectifying module, and the connection relations are as follows: the traction transformer TR-1 is powered by a power grid, a pre-charging contactor AK1 is connected with a pre-charging resistor CHR1 in series and then connected with a main contactor K11 in parallel, and then connected to the output end of the traction transformer TR-1, and a four-quadrant input current sensor CT (IN)1 is connected with an internal power supply conversion isolation contactor K12 in series and then connected to the output end of the traction transformer TR-1; the PMCF1 rectifier module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and has the structure that: TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel to form a four-quadrant A phase, and TPY11, TPY12, TNY11 and TNY12-IGBT are connected in parallel to form a four-quadrant B phase in a four-quadrant busbar in the converter; the output side of the PMCF1 rectification module is also connected with a current sensor CT (IN)7 in series; the PMCF2 four-quadrant power supply circuit comprises a traction transformer TR-2, a pre-charging contactor AK2, a pre-charging resistor CHR2, a main contactor K13, a four-quadrant input current sensor CT (IN)2 and a PMCF2 rectifying module; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, a pre-charging contactor AK2 is connected in series with a pre-charging resistor CHR2 and then connected with a main contactor K13 in parallel, and then connected to the output end of the traction transformer TR-2, and a four-quadrant input current sensor CT (IN)2 is connected to the output end of the traction transformer TR-2; the PMCF2 rectifying module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and the structure of the four-quadrant rectifier is the same as that of the PMCF1 rectifying module; the output side of the PMCF2 rectification module is also connected with a current sensor CT (IN)8 in series; the main generator power supply circuit consists of a generator, a main power generation and supply three-stage contactor KM11, a three-phase current sensor TA11, TA12 and TA 13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output lines are respectively connected with a current sensor, namely TA11, TA12 and TA 13; the output voltage is connected into a PMCF1 rectifying module and a PMCF2 rectifying module; the intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator light circuit, a voltage sensor PT1 and a ground detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are all connected to a direct current output circuit of a PMCF1 rectifying module and a PMCF2 rectifying module, and the indicator light circuit is formed by connecting a resistor HR1 and an indicator light HD1 in series and then connecting the resistor HR1 and the indicator light circuit to a direct current output circuit of the PMCF1 rectifying module and the PMCF2 rectifying module; the grounding detection circuit comprises a voltage dividing resistor GRe1, a GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistor GRe1 and the GRe2 are connected in series to the direct current output circuit, and the anti-interference filter capacitor GC1 and the voltage sensor PT2 are connected in parallel to two ends of the GRe2 and grounded; the traction inverter chopper circuit comprises a plurality of three-phase inverters and chopper INVs, the numbers of the three-phase inverters and the chopper INVs are INV 1-INVn, the structures of the three-phase inverters and the chopper INV1 are the same: a three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, connects TPVU1 and TNV1 into an inverter V phase, and connects TPW1 and TNW1 into an inverter W phase; OVT1 and OVT2 are connected with a chopping phase through an overvoltage chopping busbar in the converter, a U-phase inverter circuit is connected with a U-phase current sensor CTU1, a W-phase inverter circuit is connected with a W-phase current sensor CTW1, and a chopping current sensor CTB1 and a chopper resistor BR1 are connected in series with the circuit.
The main working principle of the invention is as follows:
1) when the main circuit supplies power by adopting network voltage, the main power generation and supply three-stage contactor KM11 is in a disconnected state, the traction transformer TR-1 and the traction transformer TR-2 of the secondary winding of the transformer supply power to the power grid, single-phase alternating current is respectively provided for the 2 groups of four-quadrant rectifiers PMCF1 and PMCF2, and the 2 groups of four quadrants adopt dual control, so that ripple current is effectively reduced, and the efficiency of the system is improved. When the main circuit adopts a diesel engine to drive a main generator to supply power, the main power generation and supply three-stage contactor KM11 is closed, the contactors K11, K12 and K13 and the pre-charging contactors AK1 and AK2 are all in an off state, and meanwhile, a pantograph of the whole vehicle is in a pantograph lowering state, so that the whole vehicle realizes power supply in an internal combustion mode and is supplied to a rear-end three-phase uncontrolled rectifying circuit.
2) The four-quadrant rectification and the three-phase uncontrolled rectification are realized by adopting the same power module:
the main power generation and supply three-stage contactor KM11 is disconnected, after pre-charging is completed through a pre-charging contactor AK1(AK2) and a pre-charging resistor CHR1(CHR2), the main contactors K11, K12 or K13 are closed, single-phase alternating current is provided to a four-quadrant rectifier PMCF1 (PMCF 2) adopting a double-tube IGBT parallel connection, and a four-quadrant rectification function is achieved through double control.
When the contact net cannot supply power, the main contactors K11, K12 and K13 and the pre-charging contactors AK1 and AK2 are disconnected, the main power generation and supply three-stage contactor KM11 is closed, a double-diode parallel three-phase uncontrolled rectifier is formed by connecting parallel diodes at two ends of an IGBT in parallel in an opposite mode through a 2-phase PMCF1 power module and a 1-phase PMCF2 power module, and a three-phase uncontrolled rectification function in an internal combustion power supply mode is achieved through the same module.
Through the different combinations of contactor, realize four-quadrant and three-phase uncontrollable rectification function with the help of the same module, realized rectifier circuit's simplification, reduced the kind and the quantity of module, reduce the cost of design, operation, maintenance spare parts, can reduce certain installation space simultaneously again.
3) The four-quadrant rectification PMCF and the three-phase inversion + chopping INV are composed of 4 branches, each branch is provided with the same IGBT, and each IGBT bridge arm is provided with the same driving plate and configuration plate.
When the four-quadrant rectification function is needed to be realized, TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel to form a four-quadrant A phase through a four-quadrant busbar in the converter, TPY11, TPY12, TNY11 and TNY12-IGBT are connected in parallel to form a four-quadrant B phase, and therefore the four-quadrant rectifier with double parallel tubes is completed.
When an inversion and chopping function is needed, connecting TPU1 and TNU1 into an inverter U phase, connecting TPVU1 and TNV1 into an inverter V phase, and connecting TPW1 and TNW1 into an inverter W phase through a three-phase inversion busbar (only one INV1 is described) in a converter; and the OVT1 and the OVT2 are connected with a chopping phase through an overvoltage chopping busbar in the converter.
Therefore, the whole traction converter adopts the same type of power module, and the functions of a four-quadrant rectifier, a three-phase inverter and an overvoltage suppression chopper with two parallel pipes can be conveniently realized through the connecting bus bar and the copper bar in the cabinet body.
Preferably, the main contactors K11, K12 and K13, the pre-charging contactors AK1 and AK2 and the main generator three-pole contactor KM11 are internal electric conversion related contactors.
Preferably, the PMCF1 rectifier module has the same structure as the PMCF2 rectifier module, IGBTs mounted in the module are the same devices, and the IGBT bridge arm of each branch is provided with the same drive board and configuration board. The three-phase inversion and chopping INV structures in the traction inversion chopper circuit are all the same, the same IGBT devices are adopted, and IGBT bridge arms of each branch are provided with the same driving plate and configuration plate. Furthermore, the PMCF1 rectifier module, PMCF2 rectifier module, the IGBT, the drive plate of three-phase contravariant chopper INV assembly, the part of configuration board, water-cooling board, electric connector, compound female arranging, the appearance, interface and the mounting dimension of module are the same completely, can realize the simplification of this main circuit traction part's power module like this, have reduced the power module kind, have reduced spare parts kind and quantity to greatly reduced design and fortune dimension cost.
Further, three-phase output voltage of the three-phase inversion and chopping INV is connected to the traction motor.
Preferably, the main circuit also supplies power to an auxiliary converter and a train power supply circuit, the auxiliary converter and the train supply power and are connected to a direct-current voltage output end of the PMCF1 rectifying module and the PMCF2 rectifying module, and a main-auxiliary integrated power supply mode is realized.
Preferably, the resistances of the voltage dividing resistors GRe1 and GRe2 are the same, so that the 1/2 resistor grounding detection is equivalently adopted, the rated insulation voltage of the main loop can be reduced, the rated insulation voltage of the main loop is half of the original rated insulation voltage, the rated impulse voltage of key electrical components such as an IGBT (insulated gate bipolar translator), a composite busbar and the like in the main loop is greatly reduced, and the design cost of the electrical components is effectively reduced; the grounding detection circuit is also connected with anti-interference filter capacitors in parallel at two ends of GRe2, so that the grounding fault can be effectively prevented from being mistakenly reported, and the accuracy of grounding fault detection can be effectively improved.
Preferably, the components in the main circuit are all components suitable for the high altitude 5100m and the high voltage DC3600V, so that a high altitude and high voltage operation environment can be realized. Adopt DC3600V voltage level busbar voltage, sharing middle support capacitance, ground connection detection return circuit, be convenient for realize lightweight and high densification: when the single-shaft power exceeds 1200kW, the DC3600V bus voltage is adopted, so that the current of a main loop can be effectively reduced, and the volume and the weight of the converter are reduced; meanwhile, the middle capacitor FC1 is shared, and a grounding detection loop (consisting of voltage dividing resistors GRe1 and GRe2, a filter capacitor GC1 and a voltage sensor PT 2) is favorable for realizing the light weight and high density of the internal electricity dual-power integrated traction converter. The realization of the high-altitude 5100m plateau environment of the internal electricity double-source power converter is as follows: in order to enable the internal electricity double-source power traction converter to be suitable for a high-altitude 5100m plateau environment, all parts in the traction converter, including an IGBT, an electric contactor, a composite busbar, a discharge resistor, a composite busbar, an insulating plate, a connecting cable and the like, adopt a 10.2kV voltage withstanding requirement, and insulation and creepage distances among conductive parts in a cabinet are designed according to a correction coefficient not lower than 5100m of high altitude.
Compared with the prior art, the invention has the following beneficial effects: the internal-power double-source traction converter main circuit provided by the invention integrates internal-power and electric power double-source power supply; a main circuit is simplified by adopting a double-tube four-quadrant module and an inversion and chopping module; the whole traction converter adopts the same power module, and the four-quadrant rectification, traction inversion and chopping functions are realized through a busbar in a traction converter cabinet body; through different combinations of the input end contactors, the same power module can realize four-quadrant rectification under the power grid power supply working condition and three-phase uncontrolled rectification under the internal combustion main power generation and supply working condition; the main circuit adopts two integral three inversions, two four-quadrant rectification outputs are connected in parallel, and the total harmonic current at the network voltage side can be effectively reduced by adopting double control; the voltage grade of DC3600V is adopted, the current of a main loop is reduced, the conductive areas of a traction converter, a whole vehicle copper bar and a cable are effectively reduced, and the volume and the weight of the whole vehicle and the traction converter are reduced; a high-voltage grade component is adopted to be suitable for a high-altitude application environment; each traction inverter is provided with an independent chopping circuit, so that the redundancy and reliability of the chopping circuit are improved when the bus voltage is over-voltage; by adopting the main circuit, the types and the number of the power module spare parts are reduced, the operation cost and the maintenance cost are greatly reduced, and the main circuit has obvious economic and social benefits.
Drawings
Fig. 1 is a general circuit schematic of the present invention.
Fig. 2 is a circuit diagram of the internal power dual-source power supply circuit of the invention.
Fig. 3 is a schematic circuit diagram of the PCMF power module of the present invention.
FIG. 4 is a circuit schematic diagram of an INV power module of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples.
An internal electric double-source traction converter main circuit is shown in figure 1: the system comprises a PMCF1 four-quadrant power supply circuit, a PMCF2 four-quadrant power supply circuit, a main generator power supply circuit, an intermediate circuit and a traction inverter chopper circuit; the PMCF1 four-quadrant power supply circuit comprises a traction transformer TR-1, a pre-charging contactor AK1, a pre-charging resistor CHR1, a main contactor K11, a four-quadrant input current sensor CT (IN)1, an internal power supply conversion isolation contactor K12 and a PMCF1 rectifying module, and the connection relations are as follows: the traction transformer TR-1 is powered by a power grid, a pre-charging contactor AK1 is connected with a pre-charging resistor CHR1 in series and then connected with a main contactor K11 in parallel, and then connected to the output end of the traction transformer TR-1, and a four-quadrant input current sensor CT (IN)1 is connected with an internal power supply conversion isolation contactor K12 in series and then connected to the output end of the traction transformer TR-1; the PMCF1 rectifier module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and has the structure that: TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel to form a four-quadrant A phase, and TPY11, TPY12, TNY11 and TNY12-IGBT are connected in parallel to form a four-quadrant B phase in a four-quadrant busbar in the converter; the output side of the PMCF1 rectification module is also connected with a current sensor CT (IN)7 in series; the PMCF2 four-quadrant power supply circuit comprises a traction transformer TR-2, a pre-charging contactor AK2, a pre-charging resistor CHR2, a main contactor K13, a four-quadrant input current sensor CT (IN)2 and a PMCF2 rectifying module; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, a pre-charging contactor AK2 is connected in series with a pre-charging resistor CHR2 and then connected with a main contactor K13 in parallel, and then connected to the output end of the traction transformer TR-2, and a four-quadrant input current sensor CT (IN)2 is connected to the output end of the traction transformer TR-2; the PMCF2 rectifying module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and the structure of the four-quadrant rectifier is the same as that of the PMCF1 rectifying module; the output side of the PMCF2 rectification module is also connected with a current sensor CT (IN)8 in series; the main generator power supply circuit consists of a generator, a main power generation and supply three-stage contactor KM11, a three-phase current sensor TA11, TA12 and TA 13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output lines are respectively connected with a current sensor, namely TA11, TA12 and TA 13; the output voltage is connected into a PMCF1 rectifying module and a PMCF2 rectifying module; the intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator light circuit, a voltage sensor PT1 and a ground detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are all connected to a direct current output circuit of a PMCF1 rectifying module and a PMCF2 rectifying module, and the indicator light circuit is formed by connecting a resistor HR1 and an indicator light HD1 in series and then connecting the resistor HR1 and the indicator light circuit to a direct current output circuit of the PMCF1 rectifying module and the PMCF2 rectifying module; the grounding detection circuit comprises a voltage dividing resistor GRe1, a GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistor GRe1 and the GRe2 are connected in series to the direct current output circuit, and the anti-interference filter capacitor GC1 and the voltage sensor PT2 are connected in parallel to two ends of the GRe2 and grounded; the traction inverter chopper circuit comprises a plurality of three-phase inverters and chopper INVs, the numbers of the three-phase inverters and the chopper INVs are INV 1-INVn, the structures of the three-phase inverters and the chopper INV1 are the same: a three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, connects TPVU1 and TNV1 into an inverter V phase, and connects TPW1 and TNW1 into an inverter W phase; OVT1 and OVT2 are connected with a chopping phase through an overvoltage chopping busbar in the converter, a U-phase inverter circuit is connected with a U-phase current sensor CTU1, a W-phase inverter circuit is connected with a W-phase current sensor CTW1, and a chopping current sensor CTB1 and a chopper resistor BR1 are connected in series with the circuit.
The embodiment adopts the preferable scheme that: the main contactors K11, K12 and K13, the pre-charging contactors AK1 and AK2 and the main generator tripolar contactor KM11 are internal electric conversion related contactors; the PMCF1 rectifier module, the PMCF2 rectifier module, the IGBT assembled by the three-phase inverter chopper INV, the driving plate, the configuration plate, the water cooling plate, the electric connector and the composite busbar are completely the same in appearance, interface and installation size; the three-phase output voltage of the three-phase inversion and chopping INV is connected to a traction motor; the main circuit also supplies power to an auxiliary converter and a train power supply circuit, and the auxiliary converter and the train supply power and are connected to the direct-current voltage output ends of the PMCF1 rectifying module and the PMCF2 rectifying module; the resistance values of the voltage dividing resistors GRe1 and GRe2 are the same; the three-phase inversion and chopping INVs are respectively INV1, INV2 and INV3 and are respectively connected to corresponding traction motors; the components in the main circuit are all components suitable for high altitude 5100m and high voltage DC3600V, and the high altitude and high voltage operation environment can be realized.
The main technical parameters of the traction converter provided by the embodiment are as follows:
the application is as follows: a traction freight train or passenger train;
shaft type: C0-C0;
axle weight: 25 t;
the operation mode is as follows: electric mode, internal combustion mode;
altitude: less than or equal to 5100 m;
and a secondary resonance circuit-free mode is adopted.
Rated voltage of intermediate direct current link: 3600V;
the number of four-quadrant rectifying units: 2;
number of traction inverters: 3;
rated output power: 3X1225 kW;
rated output voltage: 3AC 2800V;
in the power mode: rated input voltage: AC 1950V, single phase four quadrant rectification;
the power mode (freight) is more than or equal to 7200 kW;
the power mode (passenger transport) is more than or equal to 6400 kW;
in the internal combustion mode: rated input voltage: 3AC 2800V, three-phase uncontrolled rectification;
the internal combustion mode (freight) is more than or equal to 2200 kW;
the internal combustion mode (passenger transport) is more than or equal to 1460 kW;
according to the traction converter of novel internal electricity dual-source power traction converter main circuit scheme design, the whole traction device is assembled with 5 power modules in the same kind, and three-stage contactors, 3 main contactor rectifiers and 2 pre-charging contactors are combined in different switch states through 1 main power generation, so that the four-quadrant rectification function under the power supply working condition of a contact network is realized, and the three-phase uncontrolled rectification function under the power supply working condition of the main power generation is realized. The PMCF1 rectifier, the PMCF2 rectifier, the traction inversion + chopping INV1, the traction inversion + chopping INV2 and the traction inversion + chopping INV3 adopt the same power module, and the four-quadrant rectification, three-phase uncontrolled rectification, traction inversion and overvoltage suppression chopping functions are realized through a rectifier busbar, an inversion busbar and a chopping busbar in the converter. The bus voltage of the traction converter adopts DC3600V, each electrical component adopts high insulation, the traction converter can be suitable for a 5100m high-altitude operation environment, the voltage grade is adopted, the main loop current is effectively reduced, the size and the weight of the converter are favorably reduced, and the requirements of internal electricity integration, light weight, high density and high altitude are met.
The working principle of the embodiment is as follows:
1) when the main circuit is powered by network voltage, the main power generation and supply three-stage contactor KM11 is in an off state, the traction transformer TR-1 and the traction transformer TR-2 of the secondary winding of the transformer are powered by the network, after pre-charging is completed through a pre-charging contactor AK1(AK2) and a pre-charging resistor CHR1(CHR2), the main contactor K11, K12 or K13 are closed, single-phase alternating current is respectively provided for 2 groups of four-quadrant rectifiers PMCF1 and PMCF2, the four-quadrant rectification function is realized through double control, 2 groups of four quadrants adopt double control, and ripple current is effectively reduced.
2) When the main circuit adopts a diesel engine to drive a main generator to supply power or a contact network cannot supply power, a main power generation and supply three-level contactor KM11 is closed, contactors K11, K12 and K13, and pre-charging contactors AK1 and AK2 are all in a disconnected state, a double-diode parallel three-phase uncontrolled rectifier is formed by connecting parallel diodes at two ends of an IGBT in parallel in a mode of 2 phases of a PMCF1 power module and 1 phase of a PMCF2 power module in opposite directions, a three-phase uncontrolled rectification function in an internal combustion power supply mode is realized by means of the same module, and a pantograph of the whole vehicle is in a pantograph lowering state, so that the whole vehicle realizes the power supply in the internal combustion mode.
3) When the four-quadrant rectification function needs to be realized, TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel to form a four-quadrant a phase through a four-quadrant busbar in the converter, and TPY11, TPY12, TNY11 and TNY12-IGBT are connected in parallel to form a four-quadrant B phase, so that the double-tube parallel four-quadrant rectifier is completed, as shown in fig. 3.
4) When an inversion and chopping function is needed, connecting TPU1 and TNU1 into an inverter U phase, connecting TPVU1 and TNV1 into an inverter V phase, and connecting TPW1 and TNW1 into an inverter W phase through a three-phase inversion busbar (only one INV1 is described) in a converter; OVT1 and OVT2 are connected with the chopping phase through an overvoltage chopping busbar in the converter, as shown in figure 4.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (10)
1. A main circuit of an internal electric double-source traction converter is characterized in that: the system comprises a PMCF1 four-quadrant power supply circuit, a PMCF2 four-quadrant power supply circuit, a main generator power supply circuit, an intermediate circuit and a traction inverter chopper circuit;
the PMCF1 four-quadrant power supply circuit comprises a traction transformer TR-1, a pre-charging contactor AK1, a pre-charging resistor CHR1, a main contactor K11, a four-quadrant input current sensor CT (IN)1, an internal power supply conversion isolation contactor K12 and a PMCF1 rectifying module, and the connection relations are as follows: the traction transformer TR-1 is powered by a power grid, a pre-charging contactor AK1 is connected with a pre-charging resistor CHR1 in series and then connected with a main contactor K11 in parallel, and then connected to the output end of the traction transformer TR-1, and a four-quadrant input current sensor CT (IN)1 is connected with an internal power supply conversion isolation contactor K12 in series and then connected to the output end of the traction transformer TR-1; the PMCF1 rectifier module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and has the structure that: TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel to form a four-quadrant A phase, and TPY11, TPY12, TNY11 and TNY12-IGBT are connected in parallel to form a four-quadrant B phase in a four-quadrant busbar in the converter; the output side of the PMCF1 rectification module is also connected with a current sensor CT (IN)7 in series;
the PMCF2 four-quadrant power supply circuit comprises a traction transformer TR-2, a pre-charging contactor AK2, a pre-charging resistor CHR2, a main contactor K13, a four-quadrant input current sensor CT (IN)2 and a PMCF2 rectifying module; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, a pre-charging contactor AK2 is connected in series with a pre-charging resistor CHR2 and then connected with a main contactor K13 in parallel, and then connected to the output end of the traction transformer TR-2, and a four-quadrant input current sensor CT (IN)2 is connected to the output end of the traction transformer TR-2; the PMCF2 rectifying module is a four-quadrant rectifier with double-tube IGBTs connected in parallel, and the structure of the four-quadrant rectifier is the same as that of the PMCF1 rectifying module; the output side of the PMCF2 rectification module is also connected with a current sensor CT (IN)8 in series;
the main generator power supply circuit consists of a generator, a main power generation and supply three-stage contactor KM11, a three-phase current sensor TA11, TA12 and TA 13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output lines are respectively connected with a current sensor, namely TA11, TA12 and TA 13; the output voltage is connected into a PMCF1 rectifying module and a PMCF2 rectifying module;
the intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator light circuit, a voltage sensor PT1 and a ground detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are all connected to a direct current output circuit of a PMCF1 rectifying module and a PMCF2 rectifying module, and the indicator light circuit is formed by connecting a resistor HR1 and an indicator light HD1 in series and then connecting the resistor HR1 and the indicator light circuit to a direct current output circuit of the PMCF1 rectifying module and the PMCF2 rectifying module; the grounding detection circuit comprises a voltage dividing resistor GRe1, a GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistor GRe1 and the GRe2 are connected in series to the direct current output circuit, and the anti-interference filter capacitor GC1 and the voltage sensor PT2 are connected in parallel to two ends of the GRe2 and grounded;
the traction inverter chopper circuit comprises a plurality of three-phase inverters and chopper INVs, the numbers of the three-phase inverters and the chopper INVs are INV 1-INVn, the structures of the three-phase inverters and the chopper INV1 are the same: a three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, connects TPVU1 and TNV1 into an inverter V phase, and connects TPW1 and TNW1 into an inverter W phase; OVT1 and OVT2 are connected with a chopping phase through an overvoltage chopping busbar in the converter, a U-phase inverter circuit is connected with a U-phase current sensor CTU1, a W-phase inverter circuit is connected with a W-phase current sensor CTW1, and a chopping current sensor CTB1 and a chopper resistor BR1 are connected in series with the circuit.
2. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the main contactors K11, K12 and K13, the pre-charging contactors AK1 and AK2 and the main generator three-pole contactor KM11 are internal electric conversion related contactors.
3. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the PMCF1 rectifier module is the same as the PMCF2 rectifier module in structure, IGBTs assembled in the module are the same, and an IGBT bridge arm of each branch is provided with the same drive board and configuration board.
4. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the three-phase inversion and chopping INV structures in the traction inversion chopper circuit are all the same, the same IGBT devices are adopted, and IGBT bridge arms of each branch are provided with the same driving plate and configuration plate.
5. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the PMCF1 rectifier module, the PMCF2 rectifier module, the IGBT assembled by the three-phase inverter chopper INV, the drive plate, the configuration plate, the water cooling plate, the electric connector and the composite busbar are completely the same in appearance, interface and installation size.
6. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: and the three-phase output voltage of the three-phase inversion and chopping INV is connected to the traction motor.
7. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the main circuit also supplies power for an auxiliary converter and a train power supply circuit, and the auxiliary converter and the train supply power and are connected to the direct-current voltage output ends of the PMCF1 rectifying module and the PMCF2 rectifying module.
8. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the resistance values of the voltage dividing resistors GRe1 and GRe2 are the same.
9. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the three-phase inversion and chopper INVs are respectively INV1, INV2 and INV3 and are respectively connected to corresponding traction motors.
10. The main circuit of an internal electric double-source traction converter as claimed in claim 1, wherein: the components in the main circuit are all components suitable for high altitude 5100m and high voltage DC3600V, and the operation environment of high altitude can be achieved.
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| CN202111643711.7A CN114244088B (en) | 2021-12-30 | 2021-12-30 | Main circuit of internal electric double-source traction converter |
| PCT/CN2022/139087 WO2023125018A1 (en) | 2021-12-30 | 2022-12-14 | Main circuit of diesel-electric dual-powered traction converter |
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| CN202111643711.7A CN114244088B (en) | 2021-12-30 | 2021-12-30 | Main circuit of internal electric double-source traction converter |
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| WO2023125018A1 (en) * | 2021-12-30 | 2023-07-06 | 中车永济电机有限公司 | Main circuit of diesel-electric dual-powered traction converter |
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