CN114244088B - 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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- CN114244088B CN114244088B CN202111643711.7A CN202111643711A CN114244088B CN 114244088 B CN114244088 B CN 114244088B CN 202111643711 A CN202111643711 A CN 202111643711A CN 114244088 B CN114244088 B CN 114244088B
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Classifications
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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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- Electric Propulsion And Braking For Vehicles (AREA)
- Rectifiers (AREA)
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 electric power dual-source power supply; adopting a double-tube four-quadrant module and an inversion and chopper module main circuit Jian Tong; the whole traction converter adopts the same power module, and four-quadrant rectification, three-phase uncontrolled rectification and traction inversion and chopping functions are realized through a busbar in a traction converter cabinet body; the same power module can realize four-quadrant rectification of power supply working conditions of a power grid and three-phase uncontrolled rectification of internal combustion main power supply working conditions through different combinations of related contactors of an input end; the main circuit adopts two-integer three-inverse, two four-quadrant rectification input and output are connected in parallel, and the total harmonic current of the network voltage side can be effectively reduced by adopting double control; the voltage class of DC3600V is adopted, the current of a main loop is reduced, components suitable for high altitude 5100m are adopted, the plateau application environment is realized, and the volumes and the weights of the whole vehicle 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 the economic strength of China, the high-speed development of medium-speed and high-speed bullet trains and locomotives; meanwhile, in order to further improve the extremely severe places of the natural environments such as remote places, deserts, mountains, elevations and the like, particularly improve the passenger and freight capacity in the Sichuan areas, and solve the problem of mixed operation of the same train on electrified railway lines and non-electrified railway lines; meanwhile, the method is an important principle and a departure point for promoting improvement of the folk life, the rich people's happy storage, the long-term storage and the condensed hearts of the Sichuan-Tibetan railway line; or in severe natural environment (freezing rain and other weather overhead contact systems, large-area overhead contact system outage is caused) to cause large-surface interruption of the overhead contact system, when electric power cannot be pulled, a diesel engine suitable for the plateau application environment is adopted to drag a main generator to generate three-phase alternating current, and the traction is performed through an internal electric double-source power traction converter, so that emergency rescue can be implemented, normal operation of passenger and freight locomotives is ensured, and safety of railway transportation is ensured.
At present, locomotive traction modes mainly comprise 3 types: one adopts 1 single electric locomotive; secondly, 1 single diesel locomotive is adopted; and thirdly, 1 electric locomotive and 1 internal combustion locomotive are adopted for reconnection traction. The traction converter main circuits assembled are independent, independent overhead line system power supply and electric traction or independent internal combustion main power generation and electric traction, the traction converter main circuits in 2 power supply modes are independent, and the main circuits in the internal combustion power and electric double-source power supply modes are not integrated. Thus, the following drawbacks exist: firstly, a single locomotive cannot adopt a power supply mode of internal combustion and electric double-source power, and a main circuit integrating the internal electric double-source power is not realized; secondly, whether the overhead line system is independently adopted for power supply or the diesel engine is independently adopted for dragging the main power supply, the redundancy of the system is poor and the autonomous rescue is poor in extremely bad weather.
The main circuit of the prior art is designed mainly based on the difference of power sources. The contact net is adopted to supply power, four-quadrant rectification is mainly adopted to provide middle direct current bus voltage, and the power device adopts a controllable device IGBT; the diesel engine is adopted to drag the main generator to supply power mainly by adopting three-phase uncontrolled rectification, and the power device adopts an uncontrolled device diode; the original main circuit design can not realize four-quadrant rectification and three-phase uncontrolled rectification functions at the same time, and the alternating current-to-direct current parts of the power mode and the internal combustion mode are required to be realized by adopting different circuits and different power modules, so that the four-quadrant rectification power modules and the three-phase uncontrolled rectification modules in the traction converter with different power supply modes have the advantages of no simplification, multiple module types, multiple spare parts types and high stock spare parts and maintenance cost.
The existing 'Fuxing number' internal electric double-source motor train unit suitable for the high-altitude 5100m application environment adopts an electric motor car and an internal combustion motor car which are respectively hung at two ends, wherein the motor car is divided into 2 motor cars, and the highest working voltage is DC2400V. If an internal electric double-source power is collected into one locomotive in the future, the bus adopting the voltage of the grade is not easy to realize from volume and weight; and the Fuxing number does not have DC3600V bus voltage applicable to the high-altitude 5100m operating environment.
Therefore, it is important to design a traction converter main circuit which is applicable to high altitude, integrates internal power and double-source power, simplifies and unifies power modules and has low operation and maintenance cost.
Disclosure of Invention
The invention provides an internal power double-source traction converter main circuit for solving the problem of integration of power supply of electric power and internal combustion double-source power at high altitude.
The invention is realized by the following technical scheme: an internal electric double-source traction converter main circuit comprises a PMCF four-quadrant power supply circuit, a PMCF four-quadrant power supply circuit, a main generator power supply circuit, an intermediate circuit and a traction inversion chopper circuit; the PMCF 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, and internal power supply conversion isolation contactors K12 and PMCF1 rectifying modules, and the connection relation is as follows: the traction transformer TR-1 is powered by a power grid, the pre-charging contactor AK1 is connected with the pre-charging resistor CHR1 IN series and then connected with the main contactor K11 IN parallel, then the output end of the traction transformer TR-1 is connected, and the four-quadrant input current sensor CT (IN) 1 is connected with the internal power supply conversion isolation contactor K12 IN series and then connected with the output end of the traction transformer TR-1; PMCF1 the 1 rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is as follows: the four-quadrant busbar in the converter connects TPX11, TPX12, TNX11 and TNX12-IGBT 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; the output side of PMCF rectification module is connected with current sensor CT (IN) 7 IN series; the PMCF 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 and four-quadrant input current sensors CT (IN) 2 and PMCF2 rectifying modules; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, the pre-charging contactor AK2 is connected with the pre-charging resistor CHR2 IN series and then connected with the main contactor K13 IN parallel, and then connected to the output end of the traction transformer TR-2, and the four-quadrant input current sensor CT (IN) 2 is connected to the output end of the traction transformer TR-2; the PMCF rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is the same as that of the PMCF1 rectification module; the output side of PMCF rectifying module is connected with current sensor CT (IN) 8 IN series; the main generator power supply circuit consists of a generator, a main generator power supply three-stage contactor KM11, three-phase current sensors TA11, TA12 and TA13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output circuits are respectively connected with a current sensor, namely TA11, TA12 and TA13; the output voltage is connected into PMCF rectification modules and PMCF rectification modules; the intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator lamp circuit, a voltage sensor PT1 and a grounding detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module, and the indicator lamp circuit is formed by connecting a resistor HR1 and an indicator lamp HD1 in series and then connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module; the grounding detection loop comprises voltage dividing resistors GRe1 and GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistors GRe1 and 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 are grounded; the traction inversion chopper circuit comprises a plurality of three-phase inversion chopping wave INV, the numbers of the three-phase inversion chopping wave INV are INV1 to INVn, the three-phase inversion chopping wave INV1 are identical in structure, and the three-phase inversion chopping wave INV1 is formed by the following steps: the three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, TPVU and TNV1 into an inverter V phase, and TPW1 and TNW1 into an inverter W phase; the over-voltage chopper busbar in the converter is used for connecting the OVT1 and the OVT2 with a chopper phase, 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 the circuit is also connected with a chopper current sensor CTB1 and a chopper resistor BR1 in series.
The main working principle of the invention is as follows:
1) When the main circuit adopts the network voltage to supply power, 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 supply power to the power grid, single-phase alternating current is respectively provided for 2 groups of four-quadrant rectifiers PMCF and PMCF, and 2 groups of four quadrants adopt double 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 drag the main generator to supply power, the main power generation and supply three-stage contactor KM11 is closed, the contactors K11, K12 and K13 are in an open state, and the pre-charging contactors AK1 and AK2 are in a bow-falling state, so that the whole car realizes internal combustion mode power supply, and the three-phase uncontrolled rectifying circuit is supplied to the rear end.
2) Four-quadrant rectification and three-phase uncontrolled rectification are realized by adopting the same power module:
after the primary power generation and supply three-stage contactor KM11 is disconnected and the pre-charging is completed through the pre-charging contactor AK1 (AK 2) and the pre-charging resistor CHR1 (CHR 2), the primary contactors K11, K12 or K13 are closed, single-phase alternating current is supplied to the four-quadrant rectifier PMCF (PMCF 2) which is connected in parallel by adopting the double-tube IGBT, and the four-quadrant rectification function is realized through double control.
When the overhead line system cannot supply power, the main contactors K11, K12 and K13, the pre-charging contactors AK1 and AK2 are opened, the main power generation and supply three-stage contactor KM11 is closed, and the parallel diodes which are oppositely connected at two ends of the IGBT in parallel are formed by the 2 phases of the PMCF power module and the 1 phase of the PMCF power module to form a double-diode parallel three-phase uncontrolled rectifier, so that the three-phase uncontrolled rectifying function in the internal combustion power supply mode is realized by means of the same module.
Through the different combinations of the contactors, four-quadrant and three-phase uncontrolled rectifying functions are realized by means of the same module, simplification of a rectifying circuit is realized, the types and the number of the modules are reduced, the cost of design, operation and maintenance of spare parts is reduced, and meanwhile, a certain installation space can be reduced.
3) Four-quadrant rectification PMCF and 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 rectifying function is needed to be realized, TPX11, TPX12, TNX11 and TNX12-IGBT are connected in parallel through a four-quadrant busbar in the converter 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, so that the double-tube parallel four-quadrant rectifier is completed.
When the inversion and chopping functions are 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 the converter; and connecting the OVT1 and the OVT2 with a chopper phase through an overvoltage chopper busbar in the converter.
Therefore, the whole traction converter adopts the same type of power module, and the functions of the double-tube parallel four-quadrant rectifier, the three-phase inverter and the overvoltage suppression chopper can be conveniently realized through the connection busbar and the copper bar in the cabinet body.
Preferably, the main contactors K11, K12, K13, the precharge contactors AK1, AK2 and the main generator tripolar contactor KM11 are internal electric conversion related contactors.
Preferably, the PMCF rectification module and the PMCF rectification module have the same structure, IGBTs assembled in the modules are the same devices, and the IGBT bridge arm of each branch is provided with the same driving 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 device is adopted, and the IGBT bridge arm of each branch is provided with the same driving plate and configuration plate. Furthermore, the PMCF rectifying module, the PMCF rectifying module, the IGBT assembled by the three-phase inversion chopping INV, the driving plate, the configuration plate, the water cooling plate, the electric connector and the components of the composite busbar are identical in appearance, interface and installation size, so that simplification of the power module of the main circuit traction part can be realized, the types of the power module are reduced, the types and the number of spare parts are reduced, and the design and operation cost is greatly reduced.
Further, the three-phase output voltage of the three-phase inversion and chopping INV is connected to the traction motor.
Preferably, the main circuit further supplies power to the auxiliary converter and the train power supply circuit, the auxiliary converter and the train power supply are connected to the direct-current voltage output ends of the PMCF rectifying module and the PMCF rectifying module, and a main-auxiliary integrated power supply mode is achieved.
Preferably, the voltage dividing resistors GRe1 and GRe2 have the same resistance, so that the voltage dividing resistor GRe1 and GRe2 are equivalent to the adoption of 1/2 resistor grounding detection, 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 electric components such as IGBT, composite busbar and the like in the main loop is greatly reduced, and the design cost of the electric components is effectively reduced; the ground fault detection circuit is connected with anti-interference filter capacitors at two ends of the GRe2 in parallel, so that the ground fault can be effectively prevented from being mistakenly reported, and the ground fault detection accuracy can be effectively improved.
Preferably, components in the main circuit are suitable for high altitude 5100m and high voltage DC3600V, and can realize high altitude and high voltage operation environments. The DC3600V voltage class bus voltage is adopted, and the middle supporting capacitor and the grounding detection loop are shared, so that the light weight and the high density are realized conveniently: when the single-axis 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 the grounding detection loop (consisting of the divider resistors GRe1 and GRe2, the filter capacitor GC1 and the voltage sensor PT 2) is beneficial to realizing the weight reduction and the high density of the internal electric double-source power integration integrated traction converter. The realization of the high altitude 5100m plateau environment of the internal electric double-source power converter: in order to enable the internal electric double-source power traction converter to be suitable for a high altitude 5100m plateau environment, all components 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, are all required to withstand voltage of 10.2kV, and insulation and creepage distances among conductive components in the cabinet are designed according to correction coefficients not lower than the high altitude 5100 m.
Compared with the prior art, the invention has the following beneficial effects: the main circuit of the internal-power double-source traction converter integrates internal combustion and power double-source power supply; adopting a double-tube four-quadrant module and an inversion and chopper module main circuit Jian Tong; the whole traction converter adopts the same power module, and realizes four-quadrant rectification, traction inversion and chopping functions through a busbar in a traction converter cabinet body; through different combinations of input-end contactors, the same power module can realize the four-quadrant rectification of the power supply working condition of a power grid and the three-phase uncontrolled rectification function of the main power supply working condition of the internal combustion engine; the main circuit adopts two-integer three-inverse and two four-quadrant rectification outputs to be connected in parallel, and adopts double control, so that the total harmonic current of the network voltage side can be effectively reduced; the DC3600V voltage level is adopted, so that the current of a main loop is reduced, the conductive areas of a traction converter, a whole car copper bar and a cable are effectively reduced, and the volumes and the weights of the whole car and the traction converter are reduced; adopting high voltage class components to be suitable for high altitude application environment; each traction inverter is provided with an independent chopper loop, so that redundancy and reliability of the chopper loops are improved when overvoltage occurs to bus voltage; by adopting the main circuit, the variety and the number of the spare parts of the power module are reduced, the operation cost and the maintenance cost are greatly reduced, and obvious economic and social benefits are realized.
Drawings
Fig. 1 is a general schematic diagram of the present invention.
Fig. 2 is a diagram of an internal power dual source power supply circuit of the present invention.
Fig. 3 is a schematic circuit diagram of a PCMF power module of the present invention.
Fig. 4 is a schematic diagram of a circuit of an INV power module according to the present invention.
Detailed Description
The invention is further illustrated below with reference to specific examples.
An internal electric double source traction converter main circuit is shown in fig. 1: the power supply circuit comprises PMCF four-quadrant power supply circuits, PMCF four-quadrant power supply circuits, a main generator power supply circuit, an intermediate circuit and a traction inversion chopper circuit; the PMCF 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, and internal power supply conversion isolation contactors K12 and PMCF1 rectifying modules, and the connection relation is as follows: the traction transformer TR-1 is powered by a power grid, the pre-charging contactor AK1 is connected with the pre-charging resistor CHR1 IN series and then connected with the main contactor K11 IN parallel, then the output end of the traction transformer TR-1 is connected, and the four-quadrant input current sensor CT (IN) 1 is connected with the internal power supply conversion isolation contactor K12 IN series and then connected with the output end of the traction transformer TR-1; PMCF1 the 1 rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is as follows: the four-quadrant busbar in the converter connects TPX11, TPX12, TNX11 and TNX12-IGBT 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; the output side of PMCF rectification module is connected with current sensor CT (IN) 7 IN series; the PMCF 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 and four-quadrant input current sensors CT (IN) 2 and PMCF2 rectifying modules; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, the pre-charging contactor AK2 is connected with the pre-charging resistor CHR2 IN series and then connected with the main contactor K13 IN parallel, and then connected to the output end of the traction transformer TR-2, and the four-quadrant input current sensor CT (IN) 2 is connected to the output end of the traction transformer TR-2; the PMCF rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is the same as that of the PMCF1 rectification module; the output side of PMCF rectifying module is connected with current sensor CT (IN) 8 IN series; the main generator power supply circuit consists of a generator, a main generator power supply three-stage contactor KM11, three-phase current sensors TA11, TA12 and TA13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output circuits are respectively connected with a current sensor, namely TA11, TA12 and TA13; the output voltage is connected into PMCF rectification modules and PMCF rectification modules; the intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator lamp circuit, a voltage sensor PT1 and a grounding detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module, and the indicator lamp circuit is formed by connecting a resistor HR1 and an indicator lamp HD1 in series and then connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module; the grounding detection loop comprises voltage dividing resistors GRe1 and GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistors GRe1 and 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 are grounded; the traction inversion chopper circuit comprises a plurality of three-phase inversion chopping wave INV, the numbers of the three-phase inversion chopping wave INV are INV1 to INVn, the three-phase inversion chopping wave INV1 are identical in structure, and the three-phase inversion chopping wave INV1 is formed by the following steps: the three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, TPVU and TNV1 into an inverter V phase, and TPW1 and TNW1 into an inverter W phase; the over-voltage chopper busbar in the converter is used for connecting the OVT1 and the OVT2 with a chopper phase, 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 the circuit is also connected with a chopper current sensor CTB1 and a chopper resistor BR1 in series.
The preferred scheme is adopted in the embodiment: the main contactors K11, K12 and K13, the precharge contactors AK1 and AK2 and the main generator tripolar contactor KM11 are internal electric conversion related contactors; the PMCF rectifying module, the PMCF rectifying module, the IGBT assembled by the three-phase inversion chopper INV, the driving plate, the configuration plate, the water cooling plate, the electric connector and the components of the composite busbar are identical in appearance, interface and installation size; three-phase inversion and chopping INV are connected to the traction motor in a three-phase output voltage mode; the main circuit also supplies power for the auxiliary converter and the train power supply circuit, and the auxiliary converter and the train power supply are connected to the direct-current voltage output ends of the PMCF rectification module and the PMCF rectification module; the resistance values of the voltage dividing resistors GRe1 and GRe2 are the same; three-phase inversion chopping waves INV are arranged, are INV1, INV2 and INV3 respectively, and are connected to corresponding traction motors respectively; the components in the main circuit are suitable for high altitude 5100m and high voltage DC3600V, and can realize high altitude and high voltage operation environments.
The main technical parameters of the traction converter provided by the embodiment are as follows:
The application is as follows: traction freight train or passenger train;
shaft type: C0-C0;
axle weight: 25t;
Operation mode: an electric mode, an internal combustion mode;
Elevation: 5100m or less;
And a mode without a secondary resonance circuit is adopted.
Rated voltage of intermediate DC link: 3600V;
four-quadrant rectification unit number: 2;
number of traction inverters: 3, a step of;
Rated output power: 3X1225kW;
Rated output voltage: 3ac 2800v;
the power mode is as follows: 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 not less than 6400 kW;
in the internal combustion mode: rated input voltage: 3ac 2800v, three-phase uncontrolled rectification;
Internal combustion mode (freight) is more than or equal to 2200 kW;
Internal combustion mode (passenger transport) is not less than 1460 kW;
according to the traction converter designed according to the main circuit scheme of the novel internal electric double-source power traction converter, the whole traction device is assembled with 5 identical power modules, and is combined through different switch states of 1 main three-stage contactor, 3 main contactor rectifiers and 2 precharge contactors, so that the four-quadrant rectification function under the power supply working condition of the overhead contact system is realized, and the three-phase uncontrolled rectification function under the power supply working condition of the main power generation is realized. The PMCF rectifier, the PMCF rectifier, the traction inversion +chopper INV1, the traction inversion +chopper INV2 and the traction inversion +chopper INV3 adopt the same power module, and four-quadrant rectification, three-phase uncontrolled rectification, traction inversion and overvoltage suppression chopper functions are realized through a rectifier busbar, an inversion busbar and a chopper busbar in the converter. The DC3600V is adopted for the busbar voltage of the traction converter, the high insulation is adopted for each electrical component, the high-altitude 5100m running environment can be met, the voltage level is adopted, the current of a main loop is effectively reduced, the size and the weight of the converter are 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 adopts the network voltage to supply power, the main power generation and supply three-stage contactor KM11 is in an off state, the transformer secondary winding traction transformer TR-1 and the traction transformer TR-2 carry out power grid power supply, after the precharge is finished through the precharge contactor AK1 (AK 2) and the precharge resistor CHR1 (CHR 2), the main contactors K11, K12 or K13 are closed, single-phase alternating current is respectively provided for 2 groups of four-quadrant rectifiers PMCF and PMCF2, the four-quadrant rectification function is realized through double control, and the 2 groups of four quadrants adopt double control, so that the ripple current is effectively reduced.
2) When a main circuit adopts a diesel engine to drag a main generator to supply power or a contact net cannot supply power, a main power generation and supply three-stage contactor KM11 is closed, contactors K11, K12 and K13 are all in an open state, and precharge contactors AK1 and AK2 are in an open state, and a double-diode parallel three-phase uncontrolled rectifier is formed by parallel diodes of a 2-phase power module PMCF and a 1-phase power module PMCF-power module which are oppositely connected in parallel at two ends of an IGBT, so that the three-phase uncontrolled rectifier function in an internal combustion power supply mode is realized by means of the same module, and meanwhile, a pantograph of the whole vehicle is in a bow-descending state, and thus the whole vehicle realizes internal combustion mode power supply.
3) When the four-quadrant rectifying function is required to be realized, the four-quadrant bus bars in the converter are used for parallelly connecting TPX11, TPX12, TNX11 and TNX12-IGBT to form a four-quadrant A phase, and the TPY11, TPY12, TNY11 and TNY12-IGBT are parallelly connected to form a four-quadrant B phase, so that the double-tube parallel four-quadrant rectifier is completed, and the four-quadrant rectifier is shown in figure 3.
4) When the inversion and chopping functions are 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 the converter; the OVT1, OVT2 are connected to the chopping phase by an overvoltage chopping busbar in the converter, as shown in fig. 4.
The scope of the present invention is not limited to the above embodiments, and various modifications and alterations of the present invention will become apparent to those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. An internal electric double-source traction converter main circuit is characterized in that: the power supply circuit comprises PMCF four-quadrant power supply circuits, PMCF four-quadrant power supply circuits, a main generator power supply circuit, an intermediate circuit and a traction inversion chopper circuit;
The PMCF 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, and internal power supply conversion isolation contactors K12 and PMCF1 rectifying modules, and the connection relation is as follows: the traction transformer TR-1 is powered by a power grid, the pre-charging contactor AK1 is connected with the pre-charging resistor CHR1 IN series and then connected with the main contactor K11 IN parallel, then the output end of the traction transformer TR-1 is connected, and the four-quadrant input current sensor CT (IN) 1 is connected with the internal power supply conversion isolation contactor K12 IN series and then connected with the output end of the traction transformer TR-1; PMCF1 the 1 rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is as follows: the four-quadrant busbar in the converter connects TPX11, TPX12, TNX11 and TNX12-IGBT 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; the output side of PMCF rectification module is connected with current sensor CT (IN) 7 IN series;
The PMCF 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 and four-quadrant input current sensors CT (IN) 2 and PMCF2 rectifying modules; the connection relationship is as follows: the traction transformer TR-2 is powered by a power grid, the pre-charging contactor AK2 is connected with the pre-charging resistor CHR2 IN series and then connected with the main contactor K13 IN parallel, and then connected to the output end of the traction transformer TR-2, and the four-quadrant input current sensor CT (IN) 2 is connected to the output end of the traction transformer TR-2; the PMCF rectification module is a double-tube IGBT parallel four-quadrant rectifier, and the structure is the same as that of the PMCF1 rectification module; the output side of PMCF rectifying module is connected with current sensor CT (IN) 8 IN series;
the main generator power supply circuit consists of a generator, a main generator power supply three-stage contactor KM11, three-phase current sensors TA11, TA12 and TA13; the generator is controlled to work or not through a main power generation and supply three-stage contactor KM11, and three-phase output circuits are respectively connected with a current sensor, namely TA11, TA12 and TA13; the output voltage is connected into PMCF rectification modules and PMCF rectification modules;
The intermediate circuit comprises an intermediate capacitor FC1, an intermediate slow discharge resistor DR1, an indicator lamp circuit, a voltage sensor PT1 and a grounding detection loop, wherein the intermediate capacitor FC1, the intermediate slow discharge resistor DR1 and the voltage sensor PT1 are connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module, and the indicator lamp circuit is formed by connecting a resistor HR1 and an indicator lamp HD1 in series and then connected to a direct current output circuit of a PMCF rectifying module and a PMCF2 rectifying module; the grounding detection loop comprises voltage dividing resistors GRe1 and GRe2, an anti-interference filter capacitor GC1 and a voltage sensor PT2, wherein the voltage dividing resistors GRe1 and 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 are grounded;
The traction inversion chopper circuit comprises a plurality of three-phase inversion chopping wave INV, the numbers of the three-phase inversion chopping wave INV are INV1 to INVn, the three-phase inversion chopping wave INV1 are identical in structure, and the three-phase inversion chopping wave INV1 is formed by the following steps: the three-phase inversion busbar in the converter connects TPU1 and TNU1 into an inverter U phase, TPVU and TNV1 into an inverter V phase, and TPW1 and TNW1 into an inverter W phase; the over-voltage chopper busbar in the converter is used for connecting the OVT1 and the OVT2 with a chopper phase, 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 the circuit is also connected with a chopper current sensor CTB1 and a chopper resistor BR1 in series.
2. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the main contactors K11, K12, K13, the precharge contactors AK1, AK2 and the main generator tripolar contactor KM11 are internal electric conversion related contactors.
3. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the PMCF rectifying module and the PMCF rectifying module are identical in structure, IGBTs assembled in the modules are identical in device, and IGBT bridge arms of each branch are provided with identical driving plates and configuration plates.
4. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the three-phase inversion and chopping INV structures in the traction inversion chopper circuit are all the same, the same IGBT device is adopted, and the IGBT bridge arm of each branch is provided with the same driving plate and configuration plate.
5. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the power supply device comprises PMCF rectifying modules, PMCF rectifying modules, IGBT (insulated gate bipolar transistor), driving plates, configuration plates, water cooling plates, electric connectors and components of a composite busbar, wherein the IGBT, the driving plates, the configuration plates, the water cooling plates, the electric connectors and the components of the composite busbar are assembled by the three-phase inversion chopping INV, and the appearance, the interfaces and the installation dimensions of the modules are identical.
6. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the three-phase output voltage of the three-phase inversion and chopping INV is connected to the traction motor.
7. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the main circuit also supplies power for the auxiliary converter and the train power supply circuit, and the auxiliary converter and the train power supply are connected to the direct-current voltage output ends of the PMCF rectifying module and the PMCF rectifying module.
8. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the voltage dividing resistors GRe1 and GRe2 have the same resistance.
9. An internal electric double source traction converter main circuit according to claim 1, characterized in that: three-phase inversion chopping wave INV are respectively INV1, INV2 and INV3 and are respectively connected to the corresponding traction motors.
10. An internal electric double source traction converter main circuit according to claim 1, characterized in that: the components in the main circuit are suitable for high altitude 5100m and high voltage DC3600V, and can realize the high-altitude operation environment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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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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| CN203482100U (en) * | 2013-06-24 | 2014-03-12 | 北京千驷驭电气有限公司 | Hybrid-power motor-train-unit traction converter suitable for multiple power-supply modes |
| CN108696149A (en) * | 2018-05-25 | 2018-10-23 | 中车青岛四方车辆研究所有限公司 | Traction convertor and its control, troubleshooting and phase-shifting carrier wave method |
| US10773601B2 (en) * | 2018-10-18 | 2020-09-15 | Ford Global Technologies, Llc | Integrated precharging and discharging for electric vehicle drive system capacitors |
| CN111082672A (en) * | 2018-10-19 | 2020-04-28 | 株洲中车时代电气股份有限公司 | Traction converter circuit |
| CN114244088B (en) * | 2021-12-30 | 2024-04-19 | 中车永济电机有限公司 | Main circuit of internal electric double-source traction converter |
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| WO2023125018A1 (en) | 2023-07-06 |
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