CN107086824A - A Traction Auxiliary Converter - Google Patents

Abstract

AuCT is drawn the invention provides one kind, including：At least two traction convertors, direct current switchings are switched and AuCT；Not general DC busbar, and each traction convertor draws at least one traction electric machine between the traction convertor；The direct current switching switch is connected to the dc bus of many traction convertors, the direct-flow input end mouthful for the dc bus of wherein one traction convertor to be connected to the AuCT.Main circuit is completely independent between two sets of traction convertor units in the traction AuCT of the embodiment of the present invention, wherein a set of traction convertor breaks down, the work of other set is not influenceed completely, the redundancy traditional scheme in parallel compared to dc bus is greatly improved；AuCT unit is switched by direct current to be switched, it may be connected on the DC voltage of any a set of traction convertor, therefore any a set of traction convertor failure, does not affect the work of AuCT.

Description

A Traction Auxiliary Converter

technical field

The invention relates to rail transit on-board equipment, in particular to traction auxiliary converters for high-speed EMUs and intercity EMUs.

Background technique

The traction auxiliary converter is the core component of high-speed EMUs and intercity EMUs, which provides power and on-board power for trains. Fig. 1 is a schematic structural diagram of an existing traction auxiliary converter. As shown in Figure 1, the input of the traction auxiliary converter is the single-phase AC power of the secondary winding of the traction transformer. Two rectifiers are respectively connected to the secondary windings of the traction transformer, and the output DC buses are connected in parallel. Two sets of inverters are connected to the DC bus, each driving two traction motors. A set of auxiliary converters are connected to the DC bus to output sinusoidal alternating current after electrical isolation and filtering. Moreover, a centralized controller is used to control all rectifiers, inverters, and auxiliary converters.

However, the DC buses and controllers in this traction auxiliary converter are shared. When some faults occur, the entire unit will inevitably be shut down, so the redundancy still needs to be improved.

It should be noted that the above introduction of the technical background is only for the convenience of a clear and complete description of the technical solution of the present invention, and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are described in the background of the present invention.

Contents of the invention

The embodiment of the present invention provides a traction auxiliary converter to solve the problem in the prior art that when some faults occur, the entire unit inevitably shuts down due to the parallel connection of the DC buses and the common use of controllers.

In order to achieve the above purpose, an embodiment of the present invention discloses a traction auxiliary converter, including: at least two traction converters, a DC transfer switch, and an auxiliary converter; the traction converters do not share a DC bus , and each traction converter pulls at least one traction motor; the DC switch is connected to the DC bus bars of the multiple traction converters, and is used to connect the DC bus bar of one of the traction converters to all DC input port of the auxiliary converter described above.

Further, in one embodiment, each of the traction converters includes: a rectifier and a traction inverter; the rectifier is connected to the secondary winding of the traction transformer, and is used to connect the secondary winding of the traction transformer to The single-phase alternating current is rectified into direct current; the traction inverter is connected to the rectifier for inverting the direct current into alternating current with controllable frequency and amplitude, so as to traction the corresponding traction motor.

Further, in an embodiment, the auxiliary converter includes a chopper, an intermediate frequency isolated DC/DC converter, an auxiliary inverter, and a sinusoidal filter;

The chopper is connected to the DC switch, and is used to regulate the voltage of the DC output from the DC bus of one of the traction converters switched by the DC switch;

The intermediate frequency isolated DC/DC converter is connected to the chopper, and is used to perform intermediate frequency inversion on the DC voltage output by the chopper, generate an intermediate frequency square wave voltage, and convert the intermediate frequency square wave voltage to After isolation and transformation, it is rectified into low-voltage direct current;

The auxiliary inverter is connected to the intermediate frequency isolated DC/DC converter for inverting the low voltage direct current into three-phase power frequency alternating current;

The sinusoidal filter is connected to the auxiliary inverter, and is used for filtering the three-phase power-frequency alternating current to generate sinusoidal three-phase alternating current.

Further, in one embodiment, the chopper is a step-up chopper or a step-down chopper, and the number is one or more; when there are multiple choppers, the plurality of choppers The oscillators are connected in series and controlled by voltage equalization.

Further, in one embodiment, the intermediate frequency isolated DC/DC converter includes an intermediate frequency inverter, an intermediate frequency transformer, and an intermediate frequency rectifier; the intermediate frequency inverter is used to intermediate frequency the DC voltage output by the chopper Inverting to generate an intermediate frequency square wave voltage; the intermediate frequency transformer is used to isolate and transform the intermediate frequency square wave voltage; the intermediate frequency rectifier is used to rectify the isolated and transformed square wave voltage to generate the Low voltage direct current.

Further, in an embodiment, an output contactor is further included; the output contactor is connected to the auxiliary converter, and is used to switch on and off the three-phase alternating current generated by the auxiliary converter.

Further, in an embodiment, a charger is also included; the charger is connected to the intermediate frequency isolated DC/DC converter, and is used for performing DC/DC conversion on the low-voltage direct current as the control power of the train.

Further, in an embodiment, it also includes a distributed controller for controlling the traction power device; the distributed controller includes a traction converter controller, an auxiliary converter controller, and a plurality of bottom-level controllers The plurality of bottom controllers are used to receive instructions from the host computer, collect control signals including voltage, current, and speed, and perform real-time control on the rectifier power module, traction inverter power module, and auxiliary converter power module; The traction converter controller is set corresponding to the traction converter, each set of traction converter corresponds to a traction converter controller, and the traction converter controller is used to control the traction converter, to The underlying controllers of the rectifier power module and the traction inverter power module included in the traction converter send instructions and receive feedback signals; the auxiliary converter controller is used to control the auxiliary converter and the DC switch, Sending instructions to the bottom controller of the auxiliary converter power modules in the auxiliary converter and receiving feedback signals.

Further, in an embodiment, the communication cables or hard wires are used between the bottom controller and the traction converter controller, and between the bottom controller and the auxiliary converter controller. The cables are connected; the traction converter controller and the auxiliary converter controller are connected to the train bus to realize signal interaction with the train central controller.

The beneficial effects produced by the traction auxiliary converter of the embodiment of the present invention are as follows: two sets of completely independent traction converter units and a set of auxiliary converter units are integrated in the traction auxiliary converter, and the degree of integration is high; The main circuits between the sets of traction converter units are completely independent. If one set of traction converters fails, the work of the other set will not be affected at all. Compared with the traditional scheme of DC bus parallel connection, the redundancy is greatly improved; the auxiliary converters The unit can be connected to the DC voltage of any set of traction converters through the DC switching switch, so the failure of any set of traction converters will not affect the work of the auxiliary converters; the distributed architecture controller, two sets The traction converter and a set of auxiliary converters are completely independent and have high redundancy. And the controller is integrated into the power module as much as possible, which reduces the routing of control cables and analog signal cables in the box, reduces the complexity of the unit, and facilitates the assembly and maintenance of the unit.

With reference to the following description and accompanying drawings, there are disclosed in detail specific embodiments of the invention, indicating the manner in which the principles of the invention may be employed. It should be understood that embodiments of the invention are not limited thereby in scope. Embodiments of the invention encompass many changes, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural diagram of an existing traction auxiliary converter;

Fig. 2 is a schematic structural diagram of a traction auxiliary converter according to an embodiment of the present invention;

3 is a schematic structural diagram of an intermediate frequency isolated DC/DC converter according to an embodiment of the present invention;

4 is a schematic structural diagram of a distributed controller according to an embodiment of the present invention;

Fig. 5 is a circuit structure diagram of a specific embodiment of the traction auxiliary converter according to the embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, device, method or computer program product. Therefore, the present disclosure may be embodied in the form of complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

The principle and spirit of the present invention will be explained in detail below with reference to several representative embodiments of the present invention.

Fig. 2 is a schematic structural diagram of a traction auxiliary converter according to an embodiment of the present invention. As shown in Figure 2, the traction auxiliary converter of this embodiment includes: at least two traction converters, a DC switch and an auxiliary converter; the traction converters do not share a DC bus, and each The traction converter drives at least one traction motor; the DC switching switch is connected to the DC bus bars of the plurality of traction converters, and is used to connect the DC bus bar of one of the traction converters to the auxiliary converter DC input port of the device.

There are two sets of completely independent traction converter units in the traction auxiliary converter of this embodiment, namely traction converter unit 1 and traction converter unit 2 .

Each traction converter consists of a rectifier and a traction inverter. The rectifier rectifies the single-phase alternating current of the secondary side winding of the traction transformer into direct current, and the traction inverter inverts the direct current into alternating current with controllable frequency and amplitude for the traction motor, and the traction inverter integrates the brake chopper function. In this embodiment, as shown in FIG. 2 , two traction converters are included, and one traction inverter drives two traction motors on the same bogie.

Different from the prior art, the two sets of traction converters are completely independent, and there is no direct electrical connection between them, especially they do not share the DC bus. Therefore, when a serious fault occurs to one set of traction converters, the other set of traction converters will not be affected.

The DC buses of the two sets of traction converters are connected to the input of the DC transfer switch. A dc switch connects one of them to the dc input port of the auxiliary converter. The DC transfer switch enables the auxiliary converter unit to be connected to the DC bus of any set of traction converters. When one set of traction converters fails to work, the auxiliary converter unit can still be connected to another set of traction converters device and continue working.

The auxiliary converter unit in the present invention adopts an intermediate frequency architecture, which is mainly composed of four parts, a chopper, an intermediate frequency isolated DC/DC converter, an auxiliary inverter, and a sinusoidal filter.

The DC input is connected to the chopper for voltage regulation, and the output DC voltage is used as the input of the intermediate frequency isolated DC/DC converter. The chopper can also ensure the normal operation of the auxiliary converter part when the DC voltage varies in a large range.

The operating frequency of the intermediate frequency isolated DC/DC converter is around 20kHz, which is called intermediate frequency compared to the power frequency of 50Hz or 60Hz. The intermediate frequency isolated DC/DC converter first performs intermediate frequency single-phase inversion to invert DC voltage into intermediate frequency alternating current. After being stepped down by the intermediate frequency transformer, it is rectified and filtered to obtain low-voltage direct current 650Vdc. The intermediate frequency isolated DC/DC converter adopts LLC resonance technology, and at the same time realizes the soft switching of the semiconductor devices of the inverter and the rectifier.

In one embodiment, as shown in FIG. 3 , the intermediate frequency isolated DC/DC converter includes an intermediate frequency inverter, an intermediate frequency transformer, and an intermediate frequency rectifier; the intermediate frequency inverter is used to perform DC voltage output by the chopper The intermediate frequency inverter generates an intermediate frequency square wave voltage, the intermediate frequency transformer is used to isolate and transform the intermediate frequency square wave voltage, and the intermediate frequency rectifier is used to rectify the isolated and transformed square wave voltage to generate the low voltage direct current.

In this embodiment, the input DC voltage 650Vdc of the auxiliary inverter is converted into a three-phase PWM modulated square wave voltage through the auxiliary inverter. Due to the low voltage level, the switching frequency of the inverter can be significantly increased to several kHz to more than ten kHz. In contrast, the input voltage of the auxiliary inverter in the traditional scheme is 1800Vdc or 3600Vdc, and the switching frequency is usually several hundred Hz to 1.5kHz.

In this embodiment, the sinusoidal filter uses inductors and capacitors to form a sinusoidal filter, which filters the input three-phase PWM square wave voltage to obtain sinusoidal three-phase alternating current. The sinusoidal filter can be a filter of LC structure or a filter of LCL structure. Due to the significantly higher operating frequency of the auxiliary inverter, the need for sinusoidal filters is significantly reduced. The required inductance and capacitance are therefore much smaller than conventional techniques.

In another embodiment, the traction auxiliary converter further includes a charger, the input of which is connected to the output of the intermediate frequency isolated DC/DC converter. Because the input of the charger is low-voltage direct current, the difficulty of designing the charger is greatly reduced, and the compactness of the charger can be significantly improved.

In another embodiment, the traction auxiliary converter further includes an output contactor; the output contactor is connected to the auxiliary converter, and is used to open and close the three-phase alternating current generated by the auxiliary converter. disconnect.

In the present invention, the distributed controller used replaces the traditional centralized controller. The distributed controller is mainly composed of three types: multiple underlying controllers ICU, traction controller TCU, and auxiliary converter controller ACU. The connection method is shown in Figure 4. Both the traction controller TCU and the auxiliary converter controller ACU are connected to the train bus to realize interaction with the train central controller and mutual interaction. The traction converter controller TCU is connected with the underlying controller ICU through communication cables or hard-wired cables. The auxiliary converter controller ACU and the bottom controller ICU are connected through a communication cable or a hard wire cable.

The underlying controller ICU is responsible for the real-time control of the underlying layer, which involves receiving instructions from the host computer, collecting signals necessary for control such as voltage, current, and speed, realizing real-time control functions, and having basic protection functions. Its function depends on its controlled object. Its control objects include rectifier power modules, inverter power modules, and auxiliary converter power modules, which are integrated into the power modules as much as possible.

The traction controller TCU is responsible for the control of the traction converter, and implements fault diagnosis and protection functions, including communication through the network bus, sending instructions to and receiving feedback from the ICU of the rectifier and inverter, operating switches and pre-charging circuits.

The auxiliary converter controller ACU is responsible for the control of the auxiliary converter and the control of the DC switch. It directly controls the chopper and the intermediate frequency isolated DC/DC converter in real time, and sends instructions to the ICU of the auxiliary inverter. and receive its feedback to control the output switch.

Fig. 5 is a schematic structural diagram of a traction auxiliary converter according to an embodiment of the present invention. As shown in FIG. 5 , the traction auxiliary converter of this embodiment includes two identical sets of traction converter units 1 and 2 and one set of auxiliary converter unit 3 .

1. The traction transformer has two sets of secondary side windings, which are respectively connected to the input interfaces 1.1 and 2.1 of the traction auxiliary converter through cables, and then connected to the AC input of the rectifiers 1.7 and 2.7 through switches and pre-charging circuits 1.2 and 2.2 respectively .

The switch and precharge circuit 1.2 consists of a main switch 1.3, a precharge switch 1.4 and a precharge resistor 1.5. The switching and pre-charging circuit 1.2 is controlled by the traction controller TCU1.16. The pre-charging process is that the rectifier 1.7 is not started, the pre-charging switch 1.4 is first closed, and the input voltage of the traction converter charges the DC support capacitor 1.6 of the traction converter through the pre-charging resistor 1.5. After the pre-charging is completed, the main contactor 1.3 is closed, and the pre-charging process ends.

The composition and function of the switch and pre-charging circuit 2.2 are exactly the same as those of 1.2.

2. The rectifier 1.7 is composed of two parts connected in parallel, a single-phase rectifier bridge 1.8 and a brake chopper bridge arm 1.9. The single-phase rectifier bridge contains four switching tubes. The brake chopper module contains two switch tubes and a brake resistor 1.10.

The four switching tubes of the single-phase rectifier bridge work together to rectify the single-phase AC input to obtain a stable and controllable DC voltage as an output.

The function of the brake chopper module is to actively discharge the DC voltage.

The rectifier 1.7 is controlled by the controller ICU 1.14. The controller ICU 1.14 collects the input current of the input interface 1.1, collects the DC voltage of the DC support capacitor 1.6, and performs calculation and processing to control the four switching tubes of the single-phase rectifier 1.8 of the rectifier. At the same time, the controller ICU 1.14 controls the switching tube of the braking chopper bridge arm 1.9.

Rectifier 2.7 has the same structure and function as 1.7.

3. The DC outputs of the rectifiers 1.7 and 2.7 are respectively connected to the DC supporting capacitors 1.6 and 2.6 as the DC buses of the respective traction converters. The functions of DC support capacitors 1.6 and 2.6 are energy storage and filtering.

4. The DC inputs of the traction inverters 1.12 and 2.12 are respectively connected to the DC support capacitors 1.6 and 2.6. They perform inverter output respectively, and output 1.13 and 2.13 as the motor of the unit. Each traction inverter drives two electric motors connected in parallel.

The controller ICU1.15 samples the three-phase current of the output interface 1.13 and the voltage of the DC support capacitor 1.6, controls the six switching tubes of the traction inverter 1.12, and realizes the motor control algorithm.

The controller ICU2.15 samples the three-phase current of the output interface 2.13 and the voltage of the DC support capacitor 2.6, controls the six switching tubes of the traction inverter 2.12, and realizes the motor control algorithm.

5. The traction controller TCU1.16 controls the controllers ICU1.14 and 1.15 through CAN bus, high-speed serial port and hard wire, including sending torque commands, start commands, stop commands, etc. The traction controller directly controls the switching and pre-charging circuit 1.2. The traction controller coordinates the controllers ICU1.14 and 1.15, and the switch and pre-charging circuit 1.2 to complete various functions, such as traction, electric braking and so on.

The traction controller 1.16 is connected to the MVB network bus, accepts the instructions of the vehicle central controller, and feeds back its own status to it, and also connects to the outside through the external control interface 1.

The external structure and function of traction controller TCU2.16 and traction controller TCU1.16 are exactly the same.

6. The DC bus is connected to the input terminal of the DC switch 13 of the auxiliary converter unit 3 through the DC output terminals 1.11 and 2.11.

7. The step-up chopper unit 8 may use only one bridge arm, or multiple bridge arms connected in parallel to increase the capacity or increase the equivalent switching frequency. The midpoint of the bridge arm of the step-up chopper unit 8 is connected to the positive pole of the DC bus 13.2 through the DC reactance 4 . The negative pole of the bridge arm negative bus DC bus 13.2 of the step-up chopper unit 8 .

If the step-up chopper unit 8 is connected in parallel with multiple bridge arms, a higher equivalent switching frequency can be achieved through the interleaved control technology, thereby reducing the current harmonics on the DC reactance 4, thereby reducing its volume and weight.

8. The DC output of the step-up chopper unit 8 is connected to the DC capacitor 10 , and then connected to the DC input of the intermediate frequency isolated DC/DC converter 12 .

9. In the intermediate frequency isolated DC/DC converter 12, the inverter 12.1 inverts the DC input DC power into an intermediate frequency square wave voltage. Applied to the branch formed by the resonant capacitor 12.2 and the primary side of the intermediate frequency transformer 12.3 connected in series. The midpoint of the bridge arm of the intermediate frequency rectifier 12.4 is connected to the secondary winding of the intermediate frequency transformer 12.3, and rectifies the intermediate frequency AC voltage into a DC voltage as the output of the intermediate frequency isolated DC/DC converter 12.

The leakage inductance and excitation inductance of the primary side of the intermediate frequency transformer 12.3, and the resonant capacitor 12.2, through the cooperation of the switching frequency of the inverter 12.1 and the two resonant frequencies, make the inverter circuit of the primary side of the transformer work in the zero-voltage soft switching state, and the rectifier diode The bridge 12.4 works in the zero-current soft-switching state, which improves the system efficiency while completing the voltage conversion.

10. The output of the intermediate frequency isolated DC/DC converter 12 is connected to the low voltage DC support capacitor 14 .

11. The low-voltage DC support capacitor 14 constitutes the low-voltage DC bus of the auxiliary converter unit and is connected to the auxiliary inverter 5 . The auxiliary inverter 5 inverts the DC voltage into a three-phase power frequency AC, which is then connected to the sinusoidal filter 6 . The sinusoidal filter 6 is composed of an AC reactor 6.1 and an AC filter capacitor 6.2. The filter capacitor is connected to the output contactor 16, and then connected to the output 15 of the traction auxiliary converter to provide 380V/50Hz three-phase alternating current for the load.

12. Auxiliary converter controller ACU 9 controls the controller ICU7 through CAN bus, high-speed serial port and hard wire, including issuing start and stop commands.

The auxiliary converter controller ACU 9 directly controls the DC switch 13 and the output contactor 16 .

The auxiliary converter controller ACU 9 samples the current of the DC reactance 4, the voltage of the capacitor 10 and the voltage of the capacitor 14, and controls the switching tube of the step-up chopper unit 8 and the intermediate frequency isolation DC/DC converter 12 through algorithmic operation The switching tube of the middle inverter 12.1. Realize the stability of the DC voltage on the capacitor 14.

The auxiliary converter controller 9 is connected to the MVB network bus, receives instructions from the vehicle central controller, and feeds back its own status to it, and also connects to the outside through the external control interface 3 .

The beneficial effects produced by the traction auxiliary converter of the embodiment of the present invention are as follows:

1. Two sets of completely independent traction converter units and a set of auxiliary converter units are integrated in the traction auxiliary converter, with a high degree of integration;

2. The main circuits between the two sets of traction converter units are completely independent. If one set of traction converters fails, the work of the other set will not be affected at all. The redundancy is greatly improved compared with the traditional scheme of DC bus parallel connection;

3. The auxiliary converter unit can be connected to the DC voltage of any set of traction converters through the DC switch, so the failure of any set of traction converters will not affect the operation of the auxiliary converter;

4. The controller of distributed architecture, two sets of traction converters and one set of auxiliary converters are completely independent and have high redundancy. And the controller is integrated into the power module as much as possible, which reduces the routing of control cables and analog signal cables in the box, reduces the complexity of the unit, and facilitates the assembly and maintenance of the unit.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In the present invention, specific examples have been applied to explain the principles and implementation methods of the present invention, and the descriptions of the above examples are only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to this The idea of the invention will have changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (9)

1. one kind traction AuCT, it is characterised in that including：At least two traction convertors, direct currents switching switch and AuCT；Not general DC busbar, and each traction convertor draws at least one traction between the traction convertor Motor；

Direct current switching switch is connected to the dc bus of many traction convertors, for will wherein one traction current transformation The dc bus of device is connected to the direct-flow input end mouthful of the AuCT.

2. traction AuCT according to claim 1, it is characterised in that each traction convertor includes： Rectifier and traction invertor；

The rectifier is connected to Secondary Side of Traction Transformer winding, for by the single-phase of the Secondary Side of Traction Transformer winding AC rectification is into direct current；

The traction invertor connects the rectifier, for by the DC inverter into the controllable alternating current of frequency amplitude, To draw corresponding traction electric machine.

3. traction AuCT according to claim 1, it is characterised in that the AuCT include chopper, Intermediate frequency isolation DC/DC current transformers, subordinate inverter and sinusoidal filter；

The chopper connects the direct current switching switch, and wherein one traction that switching is switched for switching to the direct current becomes The direct current that the dc bus of stream device is exported carries out pressure regulation；

The intermediate frequency isolation DC/DC current transformers connect the chopper, and the DC voltage for being exported to the chopper is carried out Medium frequency inverter, generates the square-wave voltage of intermediate frequency, and is low-pressure direct to rectification after the square-wave voltage progress isolation transformation of the intermediate frequency Stream electricity；

The subordinate inverter connects the intermediate frequency isolation DC/DC current transformers, for being three-phase by the low-voltage DC inversion Industrial-frequency alternating current；

The sinusoidal filter connects the subordinate inverter, for being filtered to the three-phase main-frequency alternating current, and generation is just The three-phase alternating current of string.

4. traction AuCT according to claim 3, it is characterised in that the chopper is boost chopper or drop Chopper is pressed, quantity is one or more；

When the chopper is multiple, the multiple chopper is connected in series and uses Pressure and Control.

5. traction AuCT according to claim 3, it is characterised in that the intermediate frequency isolates DC/DC current transformer bags Include if inverter, intermediate-frequency transformer and intermediate frequency rectifier；

The if inverter is used to carry out medium frequency inverter to the DC voltage that the chopper is exported, and generates the square wave electricity of intermediate frequency Pressure；

The intermediate-frequency transformer is used to carry out isolation transformation to the square-wave voltage of the intermediate frequency；

The intermediate frequency rectifier is used to carry out rectification to the square-wave voltage after isolation transformation, generates the low-voltage DC.

6. traction AuCT according to claim 1, it is characterised in that also including output contactor；

The output contactor is connected to the AuCT, for realizing the three-phase alternating current generated to the AuCT Electricity is opened and disconnected.

7. traction AuCT according to claim 3, it is characterised in that also including charger；

The charger connects the intermediate frequency isolation DC/DC current transformers, for the low-voltage DC to be carried out into DC/DC conversions, It is used as the control electricity of train.

8. the traction AuCT according to claim any one of 1-7, it is characterised in that also including auxiliary to the traction Help the distributed director that current transformer is controlled；

The distributed director includes traction convertor controller, AuCT controller and multiple bottom controllers；

The multiple bottom controller is used to receive host computer instruction, gathers the control letter including voltage, electric current, rotating speed Number, rectifier power module, traction invertor power model, AuCT power model are controlled in real time；

The traction convertor controller is correspondingly arranged with traction convertor, one traction current transformation of correspondence of every suit traction convertor Device controller, the traction convertor controller be used for control the traction convertor, to the traction convertor include it is whole The bottom controller of stream device power model and traction invertor power model, which is sent, instructs and receives feedback signal；

The AuCT controller is used to control the AuCT and direct current to switch switch, to the auxiliary converter The bottom controller of AuCT power model in device, which is sent, instructs and receives feedback signal.

9. traction AuCT according to claim 8, it is characterised in that the bottom controller and the traction become Pass through communication cable or rigid line between stream device controller, between the bottom controller and the AuCT controller Cable is attached；

The traction convertor controller and AuCT controller access train bus-line, realize and train central controller Signal interaction.