WO2016086458A1 - 动车组救援回送装置 - Google Patents

动车组救援回送装置 Download PDF

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WO2016086458A1
WO2016086458A1 PCT/CN2014/094050 CN2014094050W WO2016086458A1 WO 2016086458 A1 WO2016086458 A1 WO 2016086458A1 CN 2014094050 W CN2014094050 W CN 2014094050W WO 2016086458 A1 WO2016086458 A1 WO 2016086458A1
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voltage
bus
asynchronous motor
emu
auxiliary
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PCT/CN2014/094050
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English (en)
French (fr)
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高永军
姬惠刚
张瑞峰
管俊青
朱剑波
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永济新时速电机电器有限责任公司
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac

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  • the invention relates to the technical field of high-speed electric trains, in particular to an EMU rescue returning device.
  • Auxiliary power supply for high-speed EMUs plays a key role in the normal operation of the vehicle and the ability of passengers to safely and normally ride the EMU.
  • other vehicles are often required to drive the faulty vehicle to the Locomotive Depot or the EMU. At this time, the EMU being dragged is in the rescue return state.
  • the auxiliary power supply system of the EMU often cannot operate normally due to lack of power supply.
  • the failure of the auxiliary system will bring a lot of problems, especially when there are passengers on the driven EMU, such as the air conditioning system of the EMU, because the auxiliary system is out of power, it can not run, resulting in higher temperature inside the EMU.
  • the present invention provides an EMU rescue loopback device for ensuring normal operation of the auxiliary system of the EMU when the EMU is in a rescue return state and no external contact network is supplied.
  • the present invention provides an EMU rescue loopback device, the EMU is in a rescue loopback state, and the device includes:
  • the pre-charging circuit comprises a DC-DC converter, two inputs of the DC-DC converter are connected to the battery through a switch, and two outputs of the DC-DC converter are respectively connected to the positive of the busbar a terminal and a negative terminal, wherein the DC-DC converter is configured to perform a step-up process on the first DC voltage provided by the battery, so that the voltage on the bus line reaches a second DC voltage;
  • Two input ends of the three-phase inverter are respectively connected to a positive end and a negative end of the bus bar, and an output end of the three-phase inverter is connected to the AC asynchronous motor for using the second Converting a direct current voltage into alternating current to pre-magnetize the alternating current asynchronous motor, and causing the alternating current asynchronous motor to enter the fourth quadrant as a generator;
  • the pre-charging circuit disconnects the switch after the AC asynchronous motor is pre-magnetized
  • the AC asynchronous motor outputs AC power according to mechanical energy generated by the EMU being dragged;
  • the three-phase inverter is further configured to perform rectification processing on the alternating current outputted by the alternating current asynchronous motor, so that the voltage on the bus line reaches a third direct current voltage;
  • the auxiliary inverter is connected in parallel with the three-phase inverter, and two input ends of the auxiliary inverter are respectively connected to a positive end and a negative end of the bus bar, and an output end of the auxiliary inverter is
  • An auxiliary system load connection is configured to convert the third DC voltage obtained from the bus to AC power to provide auxiliary power to the auxiliary system load.
  • the EMU rescue return device comprises a battery, a pre-charging circuit, a three-phase inverter, an auxiliary inverter and an AC asynchronous motor.
  • the pre-charging circuit includes a DC-DC converter connected to the battery, and is configured to obtain a first DC voltage from the battery when the EMU is in a rescue return state, and perform a boosting process on the first DC voltage.
  • the voltage on the busbar connected to the output terminal reaches the second DC voltage; after the voltage on the busbar reaches the second DC voltage, the three-phase inverter connected to the busbar operates, and the three-phase inverter applies the second
  • the DC voltage is converted into alternating current to pre-magnetize the AC asynchronous motor, so that the AC asynchronous motor enters the fourth quadrant as the generator; after the pre-magnetization of the AC asynchronous motor, the pre-charging circuit stops working; after the AC asynchronous motor enters the fourth quadrant, according to The EMU is towed by other vehicles to generate mechanical energy for power generation.
  • the EMU is applied to the busbar to make the bus voltage reach the third DC voltage required for normal traction.
  • the auxiliary inverter connected to the busbar converts the third DC voltage into the AC power required for the auxiliary system load operation, Now supply power to the auxiliary system load.
  • FIG. 1 is a schematic structural diagram of a circuit of a first embodiment of an EMU rescue and return device according to the present invention
  • FIG. 2 is a schematic diagram showing the circuit structure of the second embodiment of the EMU rescue and return device of the present invention.
  • the EMU rescue and return device is used for powering the auxiliary system load of the EMU when the EMU is in the rescue return state.
  • the device includes:
  • the pre-charging circuit 2 includes a DC-DC converter 21, and two inputs of the DC-DC converter 21 are connected to the battery through a switch K1, and two output ends thereof are respectively connected to the positive terminal VDC+ and the negative of the bus bar. End VDC-.
  • the DC-DC converter 21 is configured to perform a step-up process on the first DC voltage supplied from the battery 1 to bring the voltage on the bus to a second DC voltage. Specifically, when the EMU is in the state of rescue return, there is no external contact with the grid energy, and the battery 1 supplies the initial electric energy to the rescue loopback device, and the first DC voltage output by the battery 1 is the rated DC voltage of 110V. After the boosting process of the DC-DC converter 21, the bus line reaches a second DC voltage of about 600V.
  • the two input ends of the three-phase inverter 3 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar, and the output end of the three-phase inverter 3 is connected to the AC asynchronous motor 5 for use. Converting the second direct current voltage into alternating current to pre-magnetize the alternating current asynchronous motor, and causing the alternating current asynchronous motor to enter the fourth quadrant operation as a generator.
  • the AC asynchronous motor 5 is a three-phase AC asynchronous motor.
  • the second DC voltage of about 600 V on the DC bus is converted into AC power by the three-phase inverter 3, and the AC power is excited by the AC winding 5 after passing through the stator winding of the three-phase AC asynchronous motor 5.
  • the three-phase asynchronous motor 5 is in a power generating state, that is, three phases at this time.
  • the AC asynchronous motor 5 enters the fourth quadrant operation. After the AC asynchronous motor is pre-magnetized, the pre-charging circuit stops working, that is, K1 is turned off.
  • the DC-DC converter 21 can control the disconnection of the switch K1 according to the empirical time, that is, generally, the process of boosting about 600V can be realized after 3-5s of time, thereby, DC
  • the DC converter 21 can control the opening of the switch K1 in accordance with the empirical time.
  • the AC asynchronous motor 5 outputs alternating current according to mechanical energy generated by the driving of the motor train, and the output alternating current passes through the three-phase inverter 3; the three-phase inverter 3 is also used for The alternating current output from the asynchronous motor 5 is rectified so that the voltage on the bus reaches a third direct current voltage.
  • the rotor of the three-phase AC asynchronous motor 5 rotates to generate mechanical energy. Since the three-phase AC asynchronous motor 5 has been pre-magnetized, the three-phase AC asynchronous motor 5 is being dragged and Under the action of excitation, the fourth quadrant working state of power generation is entered, and the alternating current generated by the excitation is rectified to the DC bus through the three-phase inverter 3, so that the bus voltage reaches the third DC voltage.
  • the third DC voltage is a voltage required for the auxiliary converter to operate during normal operation of the EMU, and is generally about 3600V.
  • the AC asynchronous motor inverter 3 can be connected to an AC asynchronous motor 5, or can be connected to, for example, two AC asynchronous motors 5, that is, an AC asynchronous motor, the three-phase output of your inverter 3.
  • the terminals respectively connect the corresponding three-phase input terminals of the two AC asynchronous motors 5 to make the voltage on the bus bar reach the third DC voltage more reliably and quickly.
  • An auxiliary inverter 4 in the device is connected in parallel with the three-phase inverter 3, and two input ends of the auxiliary inverter 4 are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar, An output of the auxiliary inverter 4 is coupled to the auxiliary system load for converting the third DC voltage obtained from the bus to AC power for auxiliary power supply to the auxiliary system load.
  • the auxiliary inverter 4 starts to operate, takes power from the bus line, and outputs a three-phase output voltage to supply power to the auxiliary system load.
  • the EMU rescue return device includes a battery, a pre-charging circuit, a three-phase inverter, an auxiliary inverter, and an AC asynchronous motor.
  • the pre-charging circuit includes a DC-DC converter connected to the battery, and is configured to obtain a first DC voltage from the battery when the EMU is in a rescue return state, and perform a boosting process on the first DC voltage.
  • the voltage on the busbar connected to the output terminal reaches the second DC voltage; after the voltage on the busbar reaches the second DC voltage, the three-phase inverter connected to the busbar operates, and the AC asynchronous motor inverter
  • the two DC voltages are converted into alternating current to pre-magnetize the AC asynchronous motor, so that the AC asynchronous motor enters into power generation.
  • the machine operates in the fourth quadrant; after the AC asynchronous motor enters the fourth quadrant, it generates electricity according to the mechanical energy generated by the EMU being dragged by other vehicles, and the generated AC power is rectified by the three-phase inverter and then applied to the busbar.
  • FIG. 2 is a schematic diagram showing the circuit structure of the second embodiment of the EMU rescue and return device of the present invention.
  • the pre-charging circuit 2 of the EMU rescue and return device is further A diode 22 is included, which is connected to an output of the DC-DC converter 21 that is connected to the positive terminal VDC+ of the bus bar.
  • the diode 22 is a voltage-resistant diode and can withstand the value of the bus voltage to protect the device.
  • the EMU rescue return device further includes: a bus voltage processing circuit 6.
  • the bus voltage processing circuit 6 includes a secondary filter circuit 61, the secondary filter circuit 61 is connected to an output end of the precharge circuit 2, and two ends of the secondary filter circuit 61 are respectively connected to the bus bar
  • the positive terminal VDC+ and the negative terminal VDC- are used to filter out the second harmonic of the bus, that is, the harmonic of the frequency of 100 Hz.
  • the secondary filter circuit 61 includes a filter capacitor C1 and a filter inductor L1 connected in series.
  • the bus voltage processing circuit 6 further includes: a voltage sensor 62, wherein two ends of the voltage sensor 62 are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar, for detecting the busbar Voltage. Since the value of the bus voltage can indirectly reflect the operating state in which the three-phase inverter 3 and the auxiliary inverter 4 should be in operation, it is necessary to detect the bus voltage.
  • the voltage sensor 62 can also be used to implement the control of opening the switch K1, that is, when it detects that the bus voltage is boosted to 600V, the action of the switch K1 is turned off.
  • the bus voltage processing circuit 6 further includes: a supporting capacitor 63, wherein two ends of the supporting capacitor 63 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar for removing the bus bar Ripple.
  • the bus voltage processing circuit provided between the pre-charging circuit and the three-phase inverter and the auxiliary inverter can detect the bus voltage and filter the second harmonic and ripple on the bus. In addition, it can provide a more reliable DC to the three-phase inverter and the auxiliary inverter Electricity.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

一种动车组救援回送装置，该动车组处于救援回送状态，该装置包括蓄电池（1）、预充电电路（2）、三相逆变器（3）、辅助逆变器（4）和交流异步电机（5）。预充电电路（2）包括DC-DC变换器（21），用于对蓄电池（1）提供的第一直流电压进行升压以使母线上的电压达到第二直流电压；三相逆变器（3）用于将第二直流电压转换为交流电以预磁化交流异步电机（5），使交流异步电机（5）进入第四象限工作；交流异步电机（5）在进入第四象限工作后，根据动车组被拖动产生的机械能输出交流电，通过使三相逆变器（3）对该交流电进行整流处理，使母线上的电压达到第三直流电压；辅助逆变器（4）与三相逆变器（3）并联，用于将从母线上得到的第三直流电压转换为交流电，从而实现了以对辅助系统负载的辅助供电。

Description

动车组救援回送装置 技术领域
本发明涉及高速动车组技术领域，尤其涉及一种动车组救援回送装置。
背景技术
高速动车组的辅助供电对于车辆的正常运行以及乘客能够安全正常地乘坐动车组起着十分关键的作用。但是，当动车组因故障停车时，往往需要别的车辆拖动故障车到机务段或动车所，此时，被拖动的动车组处于救援回送状态。
由于动车组在救援回送状态下时无外接接触网供电，使得动车组的辅助供电系统往往由于没有电力供应而不能正常运行。辅助系统没电会带来很多问题，尤其是当被拖动动车组上有乘客时，动车组的比如空调系统因为辅助系统没电而不能运行，导致动车组内温度较高。
基于此，当动车组处于救援回送状态，无外接接触网供电时，如何保证辅助系统的正常供电以使辅助系统能够正常运作，是一个亟待解决的问题。
发明内容
针对上述存在的问题，本发明提供一种动车组救援回送装置，用以实现在动车组处于救援回送状态，且无外接接触网供电时，保证动车组的辅助系统正常供电运作。
本发明提供了一种动车组救援回送装置，所述动车组处于救援回送状态，所述装置包括：
蓄电池、预充电电路、三相逆变器、辅助逆变器和交流异步电机；
所述预充电电路包括DC-DC变换器，所述DC-DC变换器的两个输入端通过开关与所述蓄电池连接，所述DC-DC变换器的两个输出端分别连接在母线的正端和负端，所述DC-DC变换器用于对所述蓄电池提供的第一直流电压进行升压处理，使所述母线上的电压达到第二直流电压；
所述三相逆变器的两个输入端分别连接在所述母线的正端和负端，所述三相逆变器的输出端与所述交流异步电机连接，用于将所述第二直流电压转换为交流电以预磁化所述交流异步电机，使所述交流异步电机作为发电机进入第四象限工作；
所述预充电电路在所述交流异步电机预磁化后，断开所述开关；
所述交流异步电机根据所述动车组被拖动产生的机械能输出交流电；
所述三相逆变器还用于对所述交流异步电机输出的交流电进行整流处理，以使所述母线上的电压达到第三直流电压；
所述辅助逆变器与所述三相逆变器并联，所述辅助逆变器的两个输入端分别连接在所述母线的正端和负端，所述辅助逆变器的输出端与辅助系统负载连接，用于将从所述母线上得到的所述第三直流电压转换为交流电，以对所述辅助系统负载进行辅助供电。
本发明提供的动车组救援回送装置，包括蓄电池、预充电电路、三相逆变器、辅助逆变器和交流异步电机。其中，预充电电路中包括与蓄电池连接的DC-DC变换器，用于在所述动车组处于救援回送状态时，从蓄电池中获得第一直流电压，并对第一直流电压进行升压处理，使其输出端所连接的母线上的电压达到第二直流电压；母线上的电压达到第二直流电压后，连接在母线上的三相逆变器工作，该三相逆变器将该第二直流电压转换为交流电以预磁化交流异步电机，使得交流异步电机进入作为发电机在第四象限工作；交流异步电机预磁化后，预充电电路停止工作；交流异步电机进入第四象限工作后，根据动车组被其他车辆拖到所产生的机械能进行发电，发出的交流电经过三相逆变器的整流处理后，作用到母线上，使母线电压达到正常牵引状态时所需的第三直流电压；此时，连接在母线上的辅助逆变器将第三直流电压转换为辅助系统负载运行所需的交流电，以实现对该辅助系统负载进行供电。
附图说明
图1为本发明动车组救援回送装置实施例一的电路结构示意图；
图2为本发明动车组救援回送装置实施例二的电路结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明动车组救援回送装置实施例一的电路结构示意图，如图1所示，该动车组救援回送装置用于在动车组处于救援回送状态时，对动车组的辅助系统负载进行供电，具体地，该装置包括：
蓄电池1、预充电电路2、三相逆变器3、辅助逆变器4和交流异步电机5。
其中，预充电电路2包括DC-DC变换器21，该DC-DC变换器21的两个输入端通过开关K1与所述蓄电池连接，其两个输出端分别连接在母线的正端VDC+和负端VDC-。该DC-DC变换器21用于对所述蓄电池1提供的第一直流电压进行升压处理，使母线上的电压达到第二直流电压。具体来说，在动车组处于救援回送的状态时，无外接接触电网能量，由蓄电池1提供给该救援回送装置初始的电能，该蓄电池1输出的第一直流电压为额定的110V的直流电压，经过DC-DC变换器21的升压处理后，母线上达到约600V左右的第二直流电压。
其中，三相逆变器3的两个输入端分别连接在所述母线的正端VDC+和负端VDC-，所述三相逆变器3的输出端与所述交流异步电机5连接，用于将所述第二直流电压转换为交流电以预磁化所述交流异步电机，使所述交流异步电机作为发电机进入第四象限工作。其中，该交流异步电机5为三相交流异步电机。
具体来说，直流母线上的600V左右的第二直流电压经过三相逆变器3变换为交流电，交流电通过三相交流异步电机5的定子绕组后会对交流异步电机5励磁。三相交流异步电机5在经过励磁的预磁化后，并且由于交流异步电机5的转子因为动车组被拖动处于转动的状态，这时三相交流异步电机5处于发电状态，即此时三相交流异步电机5进入第四象限工作。交流异步电机预磁化后，预充电电路停止工作，即断开K1。值得说明的是， 本实施例中，DC-DC变换器21可以根据经验时间来控制开关K1的断开，也就是说，一般来说，经过3-5s的时间即可实现升压600V左右的处理，从而，DC-DC变换器21可以根据该经验时间来控制开关K1的断开。
进而，所述交流异步电机5根据所述动车组被拖动产生的机械能输出交流电，所述输出的交流电通过所述三相逆变器3；所述三相逆变器3还用于对所述交流异步电机5输出的交流电进行整流处理，以使所述母线上的电压达到第三直流电压。
具体来说，动车组被拖动后，三相交流异步电机5的转子会转动产生机械能，由于三相交流异步电机5已经被预磁化，这时三相交流异步电机5会在被拖动且有励磁的作用下进入到发电的第四象限工作状态，其所发出的交流电经过三相逆变器3整流到直流母线上，使得母线电压达到第三直流电压。其中，该第三直流电压为动车组在正常运行时辅助变流器运行所需的电压，一般为3600V左右。
值得说明的是，本实施例中，交流异步电机逆变器3可以与一个交流异步电机5连接，也可以连接比如2个交流异步电机5，即交流异步电机你逆变器3的三相输出端分别连接两个交流异步电机5的对应三相输入端，以更加可靠、快速地使母线上的电压达到第三直流电压。
该装置中的辅助逆变器4与所述三相逆变器3并联，所述辅助逆变器4的两个输入端分别连接在所述母线的正端VDC+和负端VDC-，所述辅助逆变器4的输出端与辅助系统负载连接，用于将从所述母线上得到的所述第三直流电压转换为交流电，以对所述辅助系统负载进行辅助供电。
具体来说，在母线上的直流电压达到第三直流电压后，辅助逆变器4启动工作，从母线上取电并输出三相输出电压，以向辅助系统负载供电。
本实施例中，动车组救援回送装置包括蓄电池、预充电电路、三相逆变器、辅助逆变器和交流异步电机。其中，预充电电路中包括与蓄电池连接的DC-DC变换器，用于在所述动车组处于救援回送状态时，从蓄电池中获得第一直流电压，并对第一直流电压进行升压处理，使其输出端所连接的母线上的电压达到第二直流电压；母线上的电压达到第二直流电压后，连接在母线上的三相逆变器工作，该交流异步电机逆变器将该第二直流电压转换为交流电以预磁化交流异步电机，使得交流异步电机进入作为发电 机在的第四象限工作；交流异步电机进入第四象限工作后，根据动车组被其他车辆拖到所产生的机械能进行发电，发出的交流电经过三相逆变器的整流处理后，作用到母线上，使母线电压达到正常牵引状态时所需的第三直流电压；此时，连接在母线上的辅助逆变器将第三直流电压转换为辅助系统负载运行所需的交流电即380V的交流电，以实现对该辅助系统负载进行供电。
图2为本发明动车组救援回送装置实施例二的电路结构示意图，如图2所示，在图1所示实施例的基础上，该动车组救援回送装置的所述预充电电路2中还包括：二极管22，所述二极管22连接在所述DC-DC变换器21的与所述母线的正端VDC+连接的输出端上。其中，该二极管22为耐压二极管，可以承受母线电压的值，对该装置起到保护的作用。
进一步地，该动车组救援回送装置还包括：母线电压处理回路6。
该母线电压处理回路6中包括二次滤波电路61，所述二次滤波电路61与所述预充电电路2的输出端连接，并且所述二次滤波电路61的两端分别连接在所述母线的正端VDC+和负端VDC-，用于滤除所述母线上的二次谐波，即100Hz频率的谐波。具体来说，该二次滤波电路61中包括串联的滤波电容C1和滤波电感L1。
进一步地，所述母线电压处理回路6中还包括：电压传感器62，所述电压传感器62的两端分别连接在所述母线的正端VDC+和负端VDC-，用于检测所述母线上的电压。由于母线电压的值能够间接反映三相逆变器3、辅助逆变器4应该处于的工作状态，因此，对于母线电压的检测非常必要。
值得说明的是，本实施例中，该电压传感器62还可以用于实现对开关K1断开的控制，即当其检测到母线电压升压为600V时，触发开关K1断开的动作。
进一步地，所述母线电压处理回路6中还包括：支撑电容63，所述支撑电容63的两端分别连接在所述母线的正端VDC+和负端VDC-，用于去除所述母线上的纹波。
本实施例中，在预充电电路与三相逆变器和辅助逆变器间设置的母线电压处理回路，能够实现对母线电压的检测，以及对母线上的二次谐波、纹波的滤除，从而能够提供给三相逆变器和辅助逆变器更加可靠的直流 电。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (5)

  1. 一种动车组救援回送装置，其特征在于，所述动车组处于救援回送状态，所述装置包括：
    蓄电池、预充电电路、三相逆变器、辅助逆变器和交流异步电机；
    所述预充电电路包括DC-DC变换器，所述DC-DC变换器的两个输入端通过开关与所述蓄电池连接，所述DC-DC变换器的两个输出端分别连接在母线的正端和负端，所述DC-DC变换器用于对所述蓄电池提供的第一直流电压进行升压处理，使所述母线上的电压达到第二直流电压；
    所述三相逆变器的两个输入端分别连接在所述母线的正端和负端，所述三相逆变器的输出端与所述交流异步电机连接，用于将所述第二直流电压转换为交流电以预磁化所述交流异步电机，使所述交流异步电机作为发电机进入第四象限工作；
    所述预充电电路在所述交流异步电机预磁化后，断开所述开关；
    所述交流异步电机根据所述动车组被拖动产生的机械能输出交流电；
    所述三相逆变器还用于对所述交流异步电机输出的交流电进行整流处理，以使所述母线上的电压达到第三直流电压；
    所述辅助逆变器与所述三相逆变器并联，所述辅助逆变器的两个输入端分别连接在所述母线的正端和负端，所述辅助逆变器的输出端与辅助系统负载连接，用于将从所述母线上得到的所述第三直流电压转换为交流电，以对所述辅助系统负载进行辅助供电。
  2. 根据权利要求1所述的动车组救援回送装置，其特征在于，所述预充电电路中还包括：二极管，所述二极管连接在所述DC-DC变换器的与所述母线的正端连接的输出端上。
  3. 根据权利要求1所述的动车组救援回送装置，其特征在于，还包括：
    母线电压处理回路，所述母线电压处理回路中包括二次滤波电路，所述二次滤波电路的两端分别连接在所述母线的正端和负端，用于滤除所述母线上的二次谐波；
    所述二次滤波电路中包括串联的滤波电容和滤波电感。
  4. 根据权利要求3所述的动车组救援回送装置，其特征在于，所述 母线电压处理回路中还包括：电压传感器，所述电压传感器的两端分别连接在所述母线的正端和负端，用于检测所述母线上的电压。
  5. 根据权利要求3所述的动车组救援回送装置，其特征在于，所述母线电压处理回路中还包括：支撑电容，所述支撑电容的两端分别连接在所述母线的正端和负端，用于去除所述母线上的纹波。
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