CN210839361U - Traction auxiliary converter for motor train unit - Google Patents
Traction auxiliary converter for motor train unit Download PDFInfo
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- CN210839361U CN210839361U CN201922254400.6U CN201922254400U CN210839361U CN 210839361 U CN210839361 U CN 210839361U CN 201922254400 U CN201922254400 U CN 201922254400U CN 210839361 U CN210839361 U CN 210839361U
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Abstract
The application provides a traction auxiliary converter for a motor train unit. This EMUs pull auxiliary converter includes: a traction converter, the traction converter comprising: rectifier circuit, middle direct current circuit, inverter circuit, middle direct current circuit's both ends are connected with rectifier circuit's one end and inverter circuit's one end respectively, and rectifier circuit's the other end is connected with the power, and inverter circuit's the other end is connected with the traction motor of EMUs, and middle direct current circuit includes: the discharging circuit is connected with each supporting capacitor module in parallel; the rectifying circuit is used for connecting a power supply and outputting direct-current voltage to the intermediate direct-current circuit; the inverter circuit is used for converting the direct-current voltage into alternating-current voltage and outputting the alternating-current voltage to the traction motor; the support capacitor module is used for stabilizing the voltage of the traction converter, and the discharge circuit is used for releasing the electric quantity on the support capacitor when the motor train unit traction auxiliary converter is powered off, so that the volume of the traction auxiliary converter is reduced.
Description
Technical Field
The application relates to the field of rail transit, in particular to a traction auxiliary converter for a motor train unit.
Background
With the continuous development of the urbanization process and the continuous improvement of the rail transit technology, people have increased demand on intercity and urban (suburb) motor train units, and have also raised higher requirements on the capability of the intercity and urban (suburb) motor train units to continuously run at high speed on long lines, the capability of short inter-station distance quick start and quick stop, frequent start, the capability of large-slope start and the capability of large passenger capacity.
In the prior art, traction, assistance and charger integrated water-cooling conversion is realized by adopting a traction auxiliary converter in motor train units in cities and suburbs, wherein the traction auxiliary converter comprises: the motor train unit traction auxiliary converter comprises a rectification circuit, an intermediate direct current circuit and an inverter circuit, wherein two ends of the intermediate direct current circuit are respectively connected with one end of the rectification circuit and one end of the inverter circuit, the other end of the rectification circuit is connected with a power supply, the other end of the inverter circuit is connected with a traction motor of a motor train unit, the intermediate direct current circuit adopts a secondary filter circuit, namely a secondary filter reactor and a secondary filter capacitor are added, and therefore the problem that the traction auxiliary converter is large in size is caused.
Disclosure of Invention
The application provides a EMUs pulls auxiliary converter includes: a traction converter, the traction converter comprising: rectifier circuit, middle direct current circuit, inverter circuit, middle direct current circuit's both ends are connected with rectifier circuit's one end and inverter circuit's one end respectively, and rectifier circuit's the other end is connected with the power, and inverter circuit's the other end is connected with the traction motor of EMUs, and middle direct current circuit includes: the discharging circuit is connected with each supporting capacitor module in parallel; the rectifying circuit is used for connecting a power supply and outputting direct-current voltage to the intermediate direct-current circuit; the inverter circuit is used for converting the direct-current voltage into alternating-current voltage and outputting the alternating-current voltage to the traction motor; the support capacitor module is used for stabilizing the voltage of the traction converter, and the discharge circuit is used for releasing the electric quantity on the support capacitor when the motor train unit traction auxiliary converter is powered off.
Through setting up the middle direct current circuit including parallel connection's support capacitor module and discharge circuit, replaced the middle direct current circuit that includes secondary filter circuit among the prior art, reduced secondary filter reactor and secondary filter electric capacity, reduced EMUs and drawn the volume and the weight of auxiliary converter.
Optionally, the traction converter further comprises: the traction auxiliary converter of the motor train unit also comprises a traction control unit, and the traction control unit is connected with the voltage detection circuit; the voltage detection circuit is used for detecting direct-current voltage; the traction control unit is used for controlling the output voltage of the inverter circuit according to the direct-current voltage.
The traction control unit controls the output voltage of the inverter circuit according to the direct-current voltage, so that the influence of a pulsation component in the direct-current voltage on the performance of the output voltage of the inverter circuit can be reduced, the quality and the stability of the output voltage of the inverter circuit are improved, the traction motor of the motor train unit runs stably, and the traction characteristic of the traction auxiliary converter of the motor train unit is improved.
Optionally, the traction control unit is configured to obtain a torque current of the traction motor from the torque current detection unit, and control an output voltage of the inverter circuit in a torque current closed-loop manner.
The traction control unit controls the output voltage of the inverter circuit according to the torque current, so that the influence of a pulsation component in the torque current on the stability of the output voltage of the inverter circuit can be reduced, the stability of the output voltage of the inverter is improved, the traction motor of the motor train unit runs stably, and the traction characteristic of the traction auxiliary converter of the motor train unit is improved.
Optionally, the traction control unit is further configured to filter out harmonic voltages of the dc voltage other than the preset frequency to obtain a filtered dc voltage; correspondingly, the traction control unit is specifically used for controlling the output voltage of the inverter circuit according to the filtered direct-current voltage.
By filtering out the direct-current voltage with the preset frequency in the direct-current voltage, the traction control unit controls the output voltage of the inverter circuit only according to the pulsating component in the direct-current voltage, the control difficulty can be reduced, and the stability of the output voltage of the inverter can be further improved.
Optionally, the traction control unit is specifically configured to: and when the filtered direct current voltage is less than or equal to the preset voltage, the output frequency of the output voltage of the inverter circuit is controlled to be reduced.
The quality and the stability of the output voltage of the inverter can be improved by adjusting the output frequency of the inverter circuit according to the magnitude of the direct-current voltage.
Optionally, the traction control unit is further configured to detect a current in a preset phase in the torque current, and perform gain phase adjustment on the current in the preset phase to obtain an adjusted torque current; correspondingly, the traction control unit is specifically used for controlling the output voltage of the inverter circuit according to the adjusted torque current.
By detecting the current of the preset phase in the torque current and performing gain phase adjustment on the current of the preset phase, the traction control unit controls the output voltage of the inverter circuit according to the opposite pulse component in the torque current, so that the control performance is improved, and the quality and the stability of the output voltage of the inverter are further improved.
Optionally, the traction-assist converter further comprises: integrated power module, integrated power module and intermediate direct current circuit are connected, and integrated power module includes: the auxiliary inverter power circuit, the charger power circuit and the water-cooling substrate are integrally arranged.
The auxiliary inverter power circuit, the charger power circuit and the water-cooled machine are integrated, so that the size and the weight of the traction auxiliary converter are reduced.
Optionally, the auxiliary inverter power circuit and the charger power circuit include: supporting the capacitive module; at least one of the capacitors in the support capacitor modules in the auxiliary inverter power circuit, the charger power circuit and the intermediate direct current circuit is as follows: dry capacitors without an outer case.
The volume and the weight of the traction auxiliary converter can be further reduced by selecting the dry capacitor without the outer shell.
Optionally, the auxiliary inverter power circuit and the charger power circuit are both arranged in contact with the water-cooled substrate.
The auxiliary inverter power circuit and the charger power circuit are arranged in contact with the water-cooling substrate, so that the size of the traction auxiliary converter is further reduced; and the heat dissipation capacity of the traction auxiliary converter is improved.
Optionally, the charger power circuit includes: the high-frequency inductor and the high-frequency transformer are coated with heat insulation materials.
The heat dissipation capacity of the charger power circuit can be further improved by coating heat insulation materials on the high-frequency inductor and the high-frequency transformer.
The application provides a EMUs pulls auxiliary converter includes: a traction converter, the traction converter comprising: rectifier circuit, middle direct current circuit, inverter circuit. The volume and the weight of the traction auxiliary converter are reduced by arranging the intermediate direct-current circuit without the secondary filter circuit; the volume and the weight of the traction auxiliary converter are further reduced by using a dry capacitor without an outer shell; the auxiliary inverter power circuit and the charger power circuit are arranged in contact with the water-cooling substrate, so that the integration level of the auxiliary inverter power circuit and the charger power circuit with the water-cooling substrate is improved, the size and the weight of the traction auxiliary converter are reduced, and the heat dissipation capacity of the traction auxiliary converter is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a traction auxiliary converter of a motor train unit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a traction converter according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a traction converter according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an intermediate DC circuit of the traction converter provided by the embodiment shown in FIG. 3;
fig. 5 is a schematic circuit diagram of a traction converter according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a traction auxiliary converter of a motor train unit according to another embodiment of the present application;
fig. 7 is a schematic diagram of a traction control unit controlling an inverter voltage according to a dc voltage according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a traction auxiliary converter of a motor train unit according to still another embodiment of the present application;
fig. 9 is a schematic structural diagram of a traction-assist converter according to another embodiment of the present application;
fig. 10 is a schematic diagram of an auxiliary inverter power circuit according to an embodiment of the present application;
fig. 11 is a schematic diagram of a charger power circuit according to an embodiment of the present application;
fig. 12 is a schematic diagram of a charger power circuit according to another embodiment of the present application;
fig. 13A is a schematic structural diagram of an integrated power module according to an embodiment of the present application;
fig. 13B is a schematic structural diagram of an integrated power module according to an embodiment of the present application;
fig. 14 is a flowchart of a method for controlling inverter voltage according to an embodiment of the present application;
fig. 15 is a flowchart of a method for controlling inverter voltage according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The converter device of the intercity motor train unit mainly has the function of converting single-phase alternating current on the secondary side of the traction transformer into a three-phase high-voltage alternating current power supply with adjustable voltage and frequency, a three-phase medium-voltage alternating current power supply with fixed voltage and frequency and a direct current power supply. Wherein a three-phase alternating current power supply with adjustable voltage and frequency can be used for supplying power to the traction motor. A fixed voltage and frequency three-phase ac power supply may be used to power ac electrical devices in the train auxiliary system. The direct current power supply can be used for supplying power to direct current electric equipment in the train auxiliary system.
The existing converter device of the intercity motor train unit adopts a water-cooling converter device integrated with a traction, an auxiliary and a charger, but a secondary filter circuit is adopted in a direct current circuit in the middle of the converter device, a secondary filter reactor and a secondary filter capacitor are added, and the size and the weight of the converter device of the intercity motor train unit are increased.
In order to solve the technical problem, the application provides a traction auxiliary converter for a motor train unit, wherein the main idea of the application is as follows: by using an intermediate DC circuit without secondary filtering, the volume and weight of the traction auxiliary converter are reduced.
Fig. 1 is a schematic structural diagram of a traction-assist converter of a motor train unit according to an embodiment of the present disclosure, and as shown in fig. 1, the traction-assist converter of the motor train unit includes: the system comprises a traction converter 11, an auxiliary converter 12, a charger 13 and a water cooling unit 14.
Wherein, the traction converter 11 is connected with the auxiliary converter 12; the auxiliary converter 12 is connected with a charger 13; the water cooling unit 14 is arranged adjacent to the auxiliary converter 12 and the charger 13.
As shown in fig. 1, the traction converter 11 is connected to a power supply 15 and a traction motor 16 external to the traction-assist converter. The traction converter 11 is used for converting a power supply 15 outside the traction auxiliary converter from single-phase alternating current into a three-phase high-voltage alternating current power supply with adjustable voltage and frequency, and transmitting the three-phase high-voltage alternating current power supply to the traction motor 16, so that stable traction braking and flexible speed regulation of the motor train unit are realized.
The auxiliary converter 12 is connected 17 to the ac consumers in the train auxiliary system outside the traction auxiliary converter. The auxiliary converter 12 is used to obtain dc power from the traction converter and convert it into three-phase medium voltage ac power for supplying ac power consumers 17 in the train auxiliary system. For example, the power is supplied to a passenger room air conditioner, a cab air conditioner, a main controller compressor, an auxiliary system of a main transformer, kitchen equipment and the like.
The charger 13 is connected to a dc consumer 18 outside the traction-assist converter. The charger 13 is used for supplying power to train load equipment connected in parallel with the charger, for example, supplying power to a train control system.
The water cooling unit 14 is used for dissipating heat of the auxiliary converter and the charger through flowing of cooling liquid in the water cooling unit, and performance of the traction auxiliary converter is improved.
Optionally, the traction auxiliary converter of the motor train unit may further include an emergency power supply, and the emergency power supply is configured to supply power to the charger control unit when the external power supply supplies power under the condition of train storage battery feed, so that the charger charges the vehicle storage battery after being started. The emergency power supply is connected with the charger and the auxiliary converter.
The traction auxiliary converter for the motor train unit can convert single-phase alternating current into a three-phase high-voltage alternating current power supply with adjustable voltage and frequency, a three-phase medium-voltage alternating current power supply with fixed voltage and frequency and a direct current power supply, and supplies power for a traction motor, train auxiliary system equipment and the like respectively.
Fig. 2 is a schematic structural diagram of a traction converter according to an embodiment of the present application, and as shown in fig. 2, the traction converter includes: a rectifier circuit 21, an intermediate dc circuit 22, and an inverter circuit 23.
Wherein, two ends of the intermediate direct current circuit 22 are respectively connected with one end of the rectification circuit 21 and one end of the inverter circuit 23; the other end of the rectifying circuit 21 is connected with the power supply 15; the other end of the inverter circuit 23 is connected to a traction motor 16 of the motor train unit.
The rectifying circuit 21 is used for connecting the power supply 15 and outputting a direct current voltage to the intermediate direct current circuit.
Optionally, the rectifying circuit 21 is one or more four-quadrant rectifiers formed by Insulated Gate Bipolar Transistors (IGBTs). When a traction motor 16 of the traction converter load motor train unit operates in a traction state, the current phase and frequency of pulse width modulation of the four-quadrant rectifier are consistent with those of a power supply 15, and the four-quadrant rectifier converts single-phase high-voltage alternating current into direct current to provide power supply input for an inverter; when the traction motor 16 of the traction converter load motor train unit operates in a braking state, the current phase of the pulse width modulation of the four-quadrant rectifier is opposite to that of the power supply 15, the frequency of the current phase is consistent with that of the power supply 15, the four-quadrant rectifier converts the residual energy of the intermediate direct-current circuit 22 into alternating current to feed back to a power grid, and the voltage of the intermediate direct-current circuit 22 is kept stable.
The inverter circuit 23 is configured to invert the dc voltage into an ac voltage and output the ac voltage to the traction motor 16.
Optionally, the inverter circuit 23 is one or more inverters formed by IGBTs. Through the sequential on and off of the IGBTs, the inverter converts direct current into three-phase high-voltage alternating current with adjustable voltage and frequency.
Optionally, the traction converter may further include an overvoltage protection circuit, which is arranged in parallel with the inverter circuit 23. The overvoltage protection circuit is composed of a resistor and a semiconductor switch and is used for protecting the inverter circuit and preventing the inverter circuit from being damaged by overlarge voltage.
The intermediate dc circuit 22 includes: at least one support capacitor module 221 and a discharge circuit 222, which is connected in parallel with each support capacitor module. The support capacitor module 221 is used for exchanging reactive power and harmonic power with the rectifier circuit 21 and the inverter circuit 23 and supporting the intermediate dc circuit voltage to keep it stable. The support capacitance module may comprise one or more capacitors connected in series.
The discharging circuit 222 is used for releasing residual charges in the circuit when the traction auxiliary converter of the motor train unit is powered off.
Optionally, the intermediate dc circuit 22 may also include a voltage detection circuit. The voltage detection circuit is used to detect the voltage of the intermediate dc circuit 22. The voltage detection circuit may be a voltage sensor, a voltmeter, or the like. The intermediate dc circuit 22 can be monitored by detecting the voltage of the intermediate dc circuit 22; the traction converter can also be controlled according to the detected direct-current voltage value, and the specific control process is not limited in the application.
Optionally, the traction converter may further include a pre-charging circuit, one end of which is connected to the power supply 15 and the other end of which is connected to the rectifying circuit 21. The pre-charging circuit can limit the amplitude of current in the power-on initial stage of the traction converter, and the function of protecting the traction converter is achieved.
For example, fig. 3 is a schematic circuit diagram of a traction converter according to an embodiment of the present application, and as shown in fig. 3, the traction converter includes a pre-charge circuit 31, a rectification circuit 32, an intermediate dc circuit 33, an overvoltage protection circuit 34, and an inverter circuit 35. A power supply 15 outside the traction auxiliary converter of the motor train unit is connected with a pre-charging circuit 31; the precharge circuit 31 is connected to the rectifier circuit 32; the rectifying circuit 32 is connected to the intermediate dc circuit 33; the intermediate direct current circuit 33 is connected with the overvoltage protection circuit 34; the overvoltage protection circuit 34 is connected with the inverter circuit 35; the inverter circuit 35 is connected to the traction motor.
The precharge circuit 31 includes a switch, a resistor, and a current detector. The rectifier circuit 32 is a four-quadrant rectifier composed of IGBTs. The overvoltage protection circuit 34 includes an IGBT, a diode, and a resistor, wherein the diode is connected in parallel with the resistor and then connected in series with the IGBT. The inverter circuit 35 is a three-phase inverter formed of IGBTs.
Fig. 4 is a schematic diagram of an intermediate dc circuit of the traction converter provided in the embodiment shown in fig. 3, and as shown in fig. 4, the intermediate dc circuit includes a support capacitor module 41, a voltage detection circuit 42, a discharge circuit 43, a support capacitor module 44, and a support capacitor module 45. The support capacitor module 41 is connected with the rectifying circuit, and the support capacitor module 41 is connected with the voltage detection circuit 42; the voltage detection circuit 42 is connected with the discharge circuit 43, and the discharge circuit 43 is connected with the support capacitor module 44; the support capacitor module 44 is connected with the support capacitor module 45; the support capacitor 45 is connected to an overvoltage protection circuit.
The support capacitor module 41 and the support capacitor module 45 comprise at least one capacitor. The support capacitor module 44 includes at least two capacitors connected in series.
The discharge circuit 43 includes at least two resistors connected in series.
The voltage detection circuit 42 may be a voltage sensor.
Fig. 5 is a schematic circuit diagram of a traction converter according to another embodiment of the present application, and as shown in fig. 5, the traction converter includes a pre-charge circuit 51, a rectification circuit 52, an intermediate dc circuit 53, an overvoltage protection circuit 54, and an inverter circuit 55. The power supply 15 outside the traction auxiliary converter of the motor train unit is connected with the pre-charging circuit 51; the precharge circuit 51 is connected to the rectifier circuit 52; the rectifying circuit 52 is connected to an intermediate dc circuit 53; the intermediate dc circuit 53 is connected to an overvoltage protection circuit 54; the overvoltage protection circuit 54 is connected with the inverter circuit 55; the inverter circuit 55 is connected to the traction motor. The pre-charging circuit 51 comprises two independent pre-charging modules which are respectively a first pre-charging module and a second pre-charging module, and the first pre-charging module and the second pre-charging module are respectively connected with a power supply 15 outside the traction auxiliary converter of the motor train unit. The two pre-charging modules have the same composition and respectively comprise a switch, a resistor and a current detector. The rectifying circuit 52 includes two independently arranged rectifying modules, namely a first rectifying module and a second rectifying module. The first rectifying module is connected with the first pre-charging module; the second rectifying module is connected with the second pre-charge module. The two independently arranged rectifying module groups are formed in the same way and are all four-quadrant rectifiers formed by IGBTs. The intermediate dc circuit 53 includes two parallel-connected intermediate dc modules, which are a first intermediate dc module and a second intermediate dc module, respectively. The first intermediate direct current module is connected with the first rectifying module; the second intermediate direct current module is connected with the second rectifying module. The first intermediate direct current module comprises a supporting capacitor module, a voltage detection circuit and a discharge circuit; the second intermediate dc module includes a support capacitor module and a voltage detection circuit. The overvoltage protection circuit 54 includes two independent overvoltage protection modules, namely a first overvoltage protection module and a second overvoltage protection module. The first overvoltage protection module is connected with the first middle direct current module; the second overvoltage protection module is connected with the second intermediate direct current module. The two paths of overvoltage protection circuits have the same composition and respectively comprise an IGBT, a diode and a resistor, wherein the diode is connected with the resistor in parallel and then connected with the IGBT in series. The inverter circuit 55 includes two independently arranged inverter circuits, which are a first inverter circuit and a second inverter circuit, respectively. The first inverter circuit is connected with the first overvoltage protection circuit; the second inverter circuit is connected with the second overvoltage protection circuit. The two inverter circuits have the same composition and are three-phase inverters formed by IGBTs. The traction converter can simultaneously pull 4 traction motors, and the loading capacity of the traction converter is improved.
This application, through setting up the middle direct current circuit including at least one support capacitor module and discharge circuit, replaced the middle direct current circuit including secondary filter circuit among the prior art, reduced secondary filter reactor and secondary filter electric capacity, reduced the volume and the weight of pulling auxiliary converter.
Fig. 6 is a schematic structural diagram of a traction auxiliary converter of a motor train unit according to another embodiment of the present application, and fig. 6 is further based on the embodiment shown in fig. 2, as shown in fig. 6, the traction converter further includes: a voltage detection circuit 61. The traction-assist converter further comprises: a traction control unit 62.
The voltage detection circuit 61 is connected in parallel with the discharge circuit for detecting the voltage of the intermediate dc circuit of the traction converter. The voltage detection circuit 61 may be a voltage sensor or the like.
The traction control unit 62 is connected to the voltage detection circuit 61 and the inverter circuit 23, and is configured to control an output voltage of the inverter circuit 23 according to the dc voltage detected by the voltage detection circuit 61.
The intermediate direct current circuit in the alternating current-direct current-alternating current system contains larger pulsation components, particularly 2-time pulsation components, which affect the stability of the output voltage of the inverter, and the stability of the output voltage of the inverter can be improved by detecting the intermediate direct current voltage and adjusting the output voltage of the inverter according to the direct current voltage, so that the stability of the voltage of the traction motor is improved.
Fig. 7 is a schematic diagram of a traction control unit controlling an inverter voltage according to a dc voltage according to an embodiment of the present application, wherein edIs a direct current voltage detected by the voltage detection circuit 61; e.g. of the typeuvOutputting a voltage for the inverter; eoIs a preset voltage. As shown in fig. 7, when the dc voltage is greater than the preset voltage, the traction control unit 62 is configured to control the output frequency of the output voltage of the inverter circuit to be increased; when the dc voltage is less than or equal to the preset voltage, the output frequency of the inverter circuit for obtaining the output voltage is controlled to be lower by the traction control unit 62.
Optionally, before the traction control unit controls the output voltage of the inverter according to the dc voltage detected by the voltage detection circuit, the traction control unit is further configured to filter the dc voltage detected by the voltage detection circuit, filter out a voltage other than a preset frequency in the dc voltage, and obtain the filtered dc voltage, where the specific preset frequency may be set according to an actual situation, and the application is not limited. For example, the traction control unit is specifically configured to filter out secondary ripple voltages in the dc voltage, such as 100Hz voltage. Correspondingly, the traction control unit is also used for controlling the output voltage of the inverter according to the direct-current voltage detected by the voltage detection circuit, and the traction control unit is also used for controlling the output voltage of the inverter according to the filtered direct-current voltage.
For example, the traction control unit is configured to control the output voltage of the inverter circuit according to the filtered dc voltage, specifically: when the direct current voltage after the filter is larger than the preset voltage, the output frequency of the output voltage of the inverter circuit is controlled to be increased, and when the direct current voltage after the filter is smaller than or equal to the preset voltage, the output frequency of the output voltage obtained by the inverter circuit is controlled to be decreased.
The direct-current voltage with the preset frequency in the direct-current voltage is filtered, so that the traction control unit controls the output voltage of the inverter circuit only according to the pulsating component in the direct-current voltage, the control difficulty can be reduced, and the stability of the output voltage of the inverter is further improved.
This application is used for according to DC voltage control inverter circuit's output voltage through the traction control unit, can be less the influence of the pulsation component in the DC voltage to inverter circuit output voltage's stability. Further, the stability of the output voltage of the inverter circuit can be improved, so that the traction motor of the motor-driven vehicle set can operate stably, and the traction performance of the traction auxiliary converter is improved.
Fig. 8 is a schematic structural diagram of a traction auxiliary converter for a motor train unit according to still another embodiment of the present application, and fig. 8 is based on any one of the embodiments shown in fig. 2 or fig. 6, as shown in fig. 8, further, the traction auxiliary converter for the motor train unit further includes a traction control unit connected to the inverter 23 and the torque current detection unit, and configured to obtain a torque current of the traction motor from the torque current detection unit and control an output voltage of the inverter circuit in a torque current closed loop manner.
The torque current detection unit may be a part of the traction auxiliary converter of the motor train unit, or may be a device other than the traction auxiliary converter of the motor train unit, and the torque current detection unit shown in fig. 8 is a device other than the traction auxiliary converter of the motor train unit. The torque current detection unit may be a current sensor, an ammeter, or the like.
Optionally, the traction control unit is further configured to detect a current in a preset phase in the torque current and perform gain phase adjustment on the current in the preset phase to obtain an adjusted torque current before the torque current of the traction motor is obtained from the torque current detection unit and the output voltage of the inverter circuit is controlled according to the torque current. Correspondingly, the traction control unit is also used for controlling the output voltage of the inverter circuit according to the adjusted torque current.
The detection of the current of the preset phase in the torque current by the traction control unit can be realized by a band-pass filter. For example, the traction control unit constructs a 100Hz band-pass filter to filter out current components other than 100Hz in the torque current, and further detects the phase of the ripple component in the torque current component. The gain phase adjustment of the traction control unit on the current with the preset phase can be realized by constructing a compensator.
The phase of the ripple component in the torque current component is detected by the band-pass filter, and the gain phase is adjusted by the compensator to adjust the strength of the beat frequency control, thereby improving the stability of the output voltage of the inverter.
The traction control unit is used for adopting the torque current to control the output voltage of the inverter circuit in a closed loop mode, and the influence of the pulsation component in the torque current on the quality and the stability of the output voltage of the inverter circuit can be reduced. And further, the quality and the stability of the output voltage of the inverter circuit can be improved, so that the traction motor of the motor train unit can stably operate, and the traction performance of the traction auxiliary converter is improved.
Fig. 9 is a schematic structural diagram of a traction-assisting converter according to still another embodiment of the present application, and fig. 9 further shows, on the basis of any one of the embodiments, that a motor train unit traction-assisting inverter further includes: the power module 91 is integrated.
The integrated power module 91 is connected to an intermediate dc circuit.
The integrated functionality module 91 includes: auxiliary inverter power circuit 911, charger power circuit 912 and water-cooling base plate 913.
The auxiliary inverter power circuit 911, the charger power circuit 912 and the water-cooled substrate 913 are integrally arranged.
The auxiliary inverter power circuit 911 is used to convert the dc power obtained from the intermediate dc circuit of the traction converter into three-phase medium voltage ac power.
The charger power circuit 912 is configured to convert the three-phase medium-voltage ac power obtained by the auxiliary inverter power circuit 911 into dc power.
The water-cooling substrate 913 is used for dissipating heat of the auxiliary converter and the charger through the flowing of the cooling liquid in the water-cooling unit, so that the normal work of the traction auxiliary converter is ensured.
Optionally, the auxiliary inverter power circuit 911 and the charger power circuit 912 include: supporting the capacitive module. The supporting capacitor module is used for supporting the direct current circuit voltage to keep the direct current circuit voltage stable, and the supporting capacitor module can comprise one or more capacitors.
At least one of the support capacitors in the auxiliary inverter power circuit 911, the charger power circuit 912 and the intermediate dc circuit is: there is no outer shell dry capacitor. Because the dry capacitor without the shell has the characteristics of good insulating property, compact structure of the capacitor body, suitability for integrated installation, light weight and the like, the dry capacitor without the shell is used for replacing an oil type capacitor in the prior art, the weight of the traction auxiliary inverter can be further reduced, and the volume of the traction auxiliary inverter can be reduced.
Optionally, the auxiliary inverter power circuit and the charger power circuit are both arranged in contact with the water-cooled substrate. The auxiliary inverter power circuit and the charger power circuit are heating modules and are arranged in contact with the water-cooling substrate, so that the heat dissipation efficiency of the auxiliary inverter power circuit and the charger power circuit can be improved.
Optionally, the charger power circuit includes: high frequency inductors and high frequency transformers.
The high-frequency transformer is used for isolating and reducing the output voltage of a half-bridge chopper circuit in the auxiliary inverter. The high-frequency inductor is used for filtering alternating current signals, so that the charger outputs stable direct current. By using the high-frequency transformer and the high-frequency inductor which can adopt a water-cooling substrate heat dissipation mode, the high integration of the auxiliary power module and the charger power module can be realized, and the volume and the weight of the traction auxiliary converter are reduced.
Optionally, the high-frequency inductor and the high-frequency transformer are coated with a heat insulating material.
The high-frequency transformer and the high-frequency inductor are subjected to surface treatment by using heat insulation materials except for the contact surface with the substrate, so that most of heat can be transferred to cooling liquid in the water-cooling substrate, a unique heat management effect is formed, the electric parts are ensured to operate in a good environment, and the volume and the weight of the traction auxiliary converter can be further reduced.
The following illustrates a specific implementation manner of the auxiliary inverter power circuit, the charger power circuit, and the power collection module.
Fig. 10 is a schematic diagram of an auxiliary inverter power circuit according to an embodiment of the present application, and as shown in fig. 10, the auxiliary inverter power circuit includes a support capacitor module 101 and an auxiliary inverter 102, and the support capacitor is disposed in parallel with the auxiliary inverter. The auxiliary inverter is a three-phase inverter composed of IGBTs.
Fig. 11 is a first schematic diagram of a charger power circuit according to an embodiment of the present disclosure, and as shown in fig. 11, the charger power circuit includes a three-phase rectifier bridge 111, a support capacitor 112, a discharge resistor 113, a voltage sensor 114, an IGBT device 115, a driving board (not shown), an absorption capacitor 116, a blocking capacitor 117, a high-frequency inductor 118, a high-frequency transformer 119, a current sensor 1110, a rectifier diode 1111, an absorption circuit 1112, and an anti-reverse diode 1113.
Fig. 12 is a schematic diagram of a charger power circuit according to another embodiment of the present application, and as shown in fig. 12, the charger power circuit includes a three-phase rectifier bridge 121, a supporting capacitor 122, a discharging resistor 123, a voltage sensor 124, an IGBT device 125, a driving board (not shown), a blocking capacitor 126, a high-frequency inductor 127, a high-frequency transformer 128, a current sensor 129, and a rectifier diode 1210.
Fig. 13A and 13B are schematic structural diagrams of an integrated power module according to an embodiment of the present disclosure, and as shown in fig. 13A and 13B, the integrated power module includes a water-cooled substrate 131, a high-frequency inductor 132, a high-frequency transformer 113, a charger IGBT134, a blocking capacitor 135, a driving component 136, a charger circuit supporting capacitor 137, an auxiliary inverter power circuit supporting capacitor 138, and an auxiliary inverter power circuit IGBT 1110.
According to the traction auxiliary converter, the auxiliary power module, the charger power module and the water-cooling substrate are integrated, so that the size and the weight of the traction auxiliary converter are further reduced, the heat dissipation capacity of the traction auxiliary converter is improved, and the performance of the traction auxiliary converter is improved.
Fig. 14 is a flowchart of a method for controlling inverter voltage according to an embodiment of the present application, where the method may be executed by a traction control unit, as shown in fig. 14, and specifically includes the following steps:
step S1401: the traction control unit obtains the voltage of the intermediate direct-current circuit of the traction converter.
Step S1402: the traction control unit controls the inverter output voltage according to the voltage of the intermediate DC circuit.
Optionally, when the dc voltage is greater than the preset voltage, the traction control unit controls the output frequency of the output voltage of the inverter circuit to increase; when the direct current voltage is less than or equal to the preset voltage, the output frequency of the inverter circuit controlled by the traction control unit to obtain the output voltage is reduced.
Optionally, before step S1402, the method may further include: and the traction control unit filters the acquired voltage of the intermediate direct current circuit to obtain a filtered direct current voltage.
Correspondingly, the traction control unit controls the output voltage of the inverter according to the voltage of the intermediate direct current circuit as follows:
and the traction control unit controls the output voltage of the inverter according to the filtered direct-current voltage.
The method for controlling the inverter voltage provided by the present application may be executed by the traction control unit, and the content and effect thereof may refer to the above embodiment section, which is not described again.
Fig. 15 is a flowchart of a method for controlling inverter voltage according to another embodiment of the present application, where the method may be executed by a traction control unit, as shown in fig. 15, and specifically includes the following steps:
step S1501: the traction control unit obtains a traction motor torque current.
Step S1502: and the traction control unit adopts a torque current closed loop to control the output voltage of the inverter.
Optionally, before step S1502, the method may further include: and the traction control unit carries out filtering and phase adjustment on the obtained torque current of the traction motor to obtain the filtered and adjusted torque current.
Correspondingly, the traction control unit adopts a torque current closed loop to control the output voltage of the inverter as follows:
and the traction control unit controls the output voltage of the inverter according to the torque current after filtering adjustment.
The method for controlling the inverter voltage provided by the present application may be executed by the traction control unit, and the content and effect thereof may refer to the above embodiment section, which is not described again.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides a EMUs pull auxiliary converter which characterized in that includes: a traction converter, the traction converter comprising: rectifier circuit, middle direct current circuit, inverter circuit, the both ends of middle direct current circuit respectively with rectifier circuit's one end with inverter circuit's one end is connected, rectifier circuit's the other end is connected with the power, inverter circuit's the other end is connected with the traction motor of EMUs, middle direct current circuit includes: the discharging circuit is connected with each supporting capacitor module in parallel;
the rectifying circuit is used for connecting the power supply and outputting direct-current voltage to the intermediate direct-current circuit;
the inverter circuit is used for converting the direct-current voltage into alternating-current voltage and outputting the alternating-current voltage to the traction motor;
the support capacitor module is used for stabilizing the voltage of the traction converter, and the discharge circuit is used for releasing the electric quantity on the support capacitor when the motor train unit traction auxiliary converter is powered off.
2. The traction auxiliary converter for motor train units according to claim 1, wherein the traction converter further comprises: the voltage detection circuit is connected with the discharge circuit in parallel, the motor train unit traction auxiliary converter further comprises a traction control unit, and the traction control unit is connected with the voltage detection circuit;
the voltage detection circuit is used for detecting the direct-current voltage;
and the traction control unit is used for controlling the output voltage of the inverter circuit according to the direct-current voltage.
3. The traction auxiliary converter for motor train units according to claim 2,
the traction control unit is used for acquiring the torque current of the traction motor from the torque current detection unit and controlling the output voltage of the inverter circuit according to the torque current.
4. The traction auxiliary converter for the motor train unit according to claim 2, wherein the traction control unit is further configured to filter out voltages of the direct current voltages other than a preset frequency to obtain filtered direct current voltages;
correspondingly, the traction control unit is specifically configured to control the output voltage of the inverter circuit according to the filtered dc voltage.
5. The traction auxiliary converter for motor train units according to claim 4,
the traction control unit is specifically configured to: and when the filtered direct current voltage is less than or equal to the preset voltage, controlling the output frequency of the output voltage of the inverter circuit to be reduced.
6. The traction auxiliary converter for the motor train unit according to claim 3, wherein the traction control unit is further configured to detect a current in a preset phase in the torque current, and perform gain phase adjustment on the current in the preset phase to obtain an adjusted torque current;
correspondingly, the traction control unit is specifically configured to control the output voltage of the inverter circuit according to the adjusted torque current.
7. The traction auxiliary converter for the motor train unit according to any one of claims 1 to 6, further comprising: an integrated power module, the integrated power module being connected with the intermediate DC circuit, the integrated power module comprising: the auxiliary inverter power circuit, the charger power circuit and the water-cooling substrate are integrally arranged.
8. The traction auxiliary converter for the motor train unit according to claim 7, wherein the auxiliary inverter power circuit and the charger power circuit comprise: supporting the capacitive module;
at least one of the auxiliary inverter power circuit, the charger power circuit and the capacitors in the support capacitor modules in the intermediate direct current circuit is as follows: dry capacitors without an outer case.
9. The traction auxiliary converter for the motor train unit according to claim 7, wherein the auxiliary inverter power circuit and the charger power circuit are both arranged in contact with the water-cooled base plate.
10. The traction-assisted converter of motor train unit according to claim 9, wherein the charger power circuit comprises: the high-frequency inductor and the high-frequency transformer are coated with heat insulation materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922254400.6U CN210839361U (en) | 2019-12-16 | 2019-12-16 | Traction auxiliary converter for motor train unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922254400.6U CN210839361U (en) | 2019-12-16 | 2019-12-16 | Traction auxiliary converter for motor train unit |
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| Publication Number | Publication Date |
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| CN210839361U true CN210839361U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922254400.6U Active CN210839361U (en) | 2019-12-16 | 2019-12-16 | Traction auxiliary converter for motor train unit |
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| CN (1) | CN210839361U (en) |
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