WO2023066068A1

WO2023066068A1 - Three-phase traction transmission power supply system for multiple units

Info

Publication number: WO2023066068A1
Application number: PCT/CN2022/124411
Authority: WO
Inventors: 王永建; 钟磊; 张伟鹏; 吴波
Original assignee: 成都尚华电气有限公司
Priority date: 2021-10-18
Filing date: 2022-10-10
Publication date: 2023-04-27
Also published as: CN113895241A; JP2024535649A

Abstract

A three-phase traction transmission power supply system for multiple units, the system comprising: a three-phase rectification apparatus (100), which comprises a three-phase alternating-current input port and three direct-current output port groups, each direct-current output port group comprising n direct-current output ports, wherein n ≥ 1, and the value of n is set according to a voltage level of an external three-phase power source; a DC/DC conversion apparatus (200), which comprises 3n independent power electronic transformers (210), wherein an input port of each power electronic transformer (210) is correspondingly connected to a direct-current output port of the three-phase rectification apparatus (100), and output ports of the power electronic transformers (210) are connected in parallel to serve as a direct-current output port of the DC/DC conversion apparatus (200); and a traction inverter apparatus (300), an input port of which is connected to the direct-current output port of the DC/DC conversion apparatus (200), and an output port of which is electrically connected to a traction motor (400).

Description

A three-phase EMU traction drive power supply system

Cross References to Related Applications

This application claims the benefit of Chinese patent application 202111212740.8 filed on October 18, 2021, the contents of which are incorporated herein by reference.

technical field

The invention relates to the technical field of electrified railways and urban rails, in particular to a three-phase EMU traction drive power supply system.

Background technique

Compared with DC traction motors, AC traction motors have the advantages of high power density, low price, simplicity and reliability, and good anti-idling performance. Therefore, they are replacing DC motors as the main power source for mainline electrified railways and urban rail transit traction. Electrified railways use single-phase power supply, and AC traction motors on electric locomotives or EMUs need to be driven by three-phase inverters. In order to realize this conversion function, the electric locomotive or the EMU is equipped with an AC-DC-AC traction converter, which first converts the single-phase AC into DC, and then converts it into a three-phase AC through the inverter, and realizes speed regulation through voltage regulation and frequency modulation. . The rated voltage of the traction bus in the current electrified railway power supply system is 27.5kV, and the maximum voltage reaches 31kV. Due to the limitation of the rated voltage of power electronic devices, electric locomotives and EMUs are equipped with on-board traction transformers, which first step down the voltage of the traction network before supplying traction converter. However, the vehicle-mounted traction transformer has a large volume and weight, which increases the axle load of the locomotive or EMU, increases losses, reduces efficiency, and affects power density, restricting the further improvement of the speed of the EMU.

In order to cancel the on-board traction transformer, the applicant applied for "A Traction Drive Power Supply System for EMUs" (ZL202011206524.8), but this application scheme is only applicable to traction power supply systems with single-phase traction power supply and low catenary voltage. Considering In the case of the same power supply capacity (capacity), the manufacture and construction of three-phase generators, motors, and transmission lines are more material-saving than single-phase similar components, and the structure is simple and the performance is excellent. Therefore, the three-phase traction power supply system is expected to replace the single-phase traction power supply system as a new traction power supply system. On this basis, it is a problem worth studying to design a three-phase EMU traction drive power supply system that can be applied to different voltage levels and can still cancel the on-board traction transformer.

Contents of the invention

The purpose of the present invention is to provide a three-phase EMU traction drive power supply system, which can directly take power from an external power source through a three-phase rectifier to drive the traction motor, can cancel the on-board traction transformer, and can set the DC output port n according to different voltage levels The value is applicable to a wide range.

The present invention realizes by following technical means:

A three-phase EMU traction drive power supply system, comprising:

A three-phase rectifier, including three-phase AC input ports and three sets of DC output port groups, each set of DC output port groups includes n DC output ports, where n≥1;

The DC/DC conversion device includes 3n independent power electronic transformers, the input port of each power electronic transformer is correspondingly connected to a DC output port of the three-phase rectification device, and the output port of each power electronic transformer is connected in parallel as the DC The DC output port of the /DC conversion device;

A traction inverter device, the input port of the traction inverter device is connected to the DC output port of the DC/DC conversion device, and the output port of the traction inverter device is electrically connected to the traction motor.

Further, the three-phase rectification device includes three sets of H-bridge cascaded rectifiers, each set of H-bridge cascaded rectifiers includes n single-phase rectifiers, and the input ports of the n single-phase rectifiers of each set of H-bridge cascaded rectifiers are cascaded Finally, the first input terminal and the second input terminal are formed, the three first input terminals are connected to each other, and the three second input terminals together form the three-phase AC input port of the three-phase rectifier device, and each group of H-bridge cascaded rectifiers The output ports of the n single-phase rectifiers jointly constitute a set of DC output port groups of the three-phase rectifier device.

Further, the value of n is determined according to the voltage level of the external three-phase power supply and the rated input voltage of the single-phase rectifier.

Further, an auxiliary inverter device is also included, the input port of the auxiliary inverter device is connected to the DC output port of the DC/DC conversion device, and the output port of the auxiliary inverter device is electrically connected to auxiliary equipment.

Further, a reactor is connected in series with the three-phase AC input port of the three-phase rectifying device.

Further, the power electronic transformer includes a single-phase full-bridge inverter, a high-frequency transformer and a single-phase full-bridge rectifier connected in sequence, and the DC input port of the single-phase full-bridge inverter serves as the input port of the power electronic transformer. The input port, the DC output port of the single-phase full-bridge rectifier is used as the output port of the power electronic transformer.

Further, a reactor and a capacitor are connected between the output port of the single-phase full-bridge inverter and the primary side of the high-frequency transformer, and the secondary side of the high-frequency transformer is connected to the single-phase full-bridge rectifier A reactor and a capacitor are connected between the input ports.

Further, a capacitor is connected in parallel to the DC input port of the single-phase full-bridge inverter, and a capacitor is connected in parallel to the DC output port of the single-phase full-bridge rectifier.

Further, the power electronic transformer includes a single-phase half-bridge inverter, a high-frequency transformer, and a single-phase half-bridge rectifier connected in sequence, and the DC input port of the single-phase half-bridge inverter serves as the input port of the power electronic transformer. The input port, the DC output port of the single-phase half-bridge rectifier is used as the output port of the power electronic transformer.

Further, a reactor and a capacitor are connected between the output port of the single-phase half-bridge inverter and the primary side of the high-frequency transformer, and the secondary side of the high-frequency transformer is connected to the single-phase half-bridge rectifier A reactor and a capacitor are connected between the input ports.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention is applicable to a three-phase traction power supply system. It directly takes power from an external three-phase power supply (three-phase traction network or three-phase catenary) through a three-phase rectifier to drive the traction motor, which can cancel the vehicle-mounted traction transformer, and can The value of voltage level setting n is applicable to a wide range of voltage levels;

2. Compared with traditional traction transformers, power electronic transformers are small in size and light in weight. They are used in the traction drive power supply system of EMUs, which can reduce the space occupied by equipment and reduce the axle load; in addition, the use of power electronic transformers can effectively isolate voltage fluctuations , distortion and harmonic transmission, realize the decoupling of grid side and load side;

3. The power electronic transformer is applied to the three-phase train traction drive system to realize locomotive traction, which is a selection scheme for a three-phase train traction drive system.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present invention, but do not constitute limitations to the embodiments of the present invention.

Fig. 1 is a schematic structural diagram of a traction drive power supply system for a three-phase EMU according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram of a power electronic transformer adopting a full bridge structure according to an exemplary embodiment.

Fig. 3 is a schematic structural diagram of a power electronic transformer adopting a half-bridge structure according to an exemplary embodiment.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, this embodiment provides a three-phase EMU traction drive power supply system, including:

The three-phase rectifying device 100 includes three-phase AC input ports and three sets of DC output port groups, each set of DC output port groups includes n DC output ports, where n≥1;

The DC/DC conversion device 200 includes 3n independent power electronic transformers (denoted as 210 in FIGS. The output ports of the power electronic transformers are connected in parallel as the DC output ports of the DC/DC conversion device 200;

The traction inverter device 300 , the input port of the traction inverter device 300 is connected to the DC output port of the DC/DC conversion device 200 , and the output port of the traction inverter device 300 is electrically connected to the traction motor 400 .

Here, the 3n independent power electronic transformers in the DC/DC conversion device 200 can be regarded as 3 groups of power electronic transformer groups, each group of power electronic transformer groups includes n independent power electronic transformers, and the 3 groups of electronic transformer groups are respectively connected to the three-phase The three sets of DC output port groups in the rectifier device 100 correspond to each other, that is, each input port of the power electronic transformer is correspondingly connected to a DC output port of the three-phase rectifier device.

When implementing this embodiment, the three-phase rectifier 100 takes power from an external three-phase power supply, and the external three-phase power supply can be a three-phase traction network or a three-phase contact network in a three-phase traction power supply system, a three-phase traction network or a three-phase contact network. The grid can be a three-phase overhead line or a three-phase track laid on the ground. The voltage level of the external three-phase power supply (three-phase traction network or three-phase catenary voltage level) is set according to the actual situation. Voltage level, set different n values, a wide range of applications.

Preferably, the three-phase rectification device includes three sets of H-bridge cascaded rectifiers, each set of H-bridge cascaded rectifiers includes n single-phase rectifiers, and the input ports of each set of H-bridge cascaded rectifiers are cascaded After that, the first input terminal (denoted as input1) and the second input terminal (denoted as input2) are formed, the three first input terminals (input1) are connected to each other, and the three second input terminals (input2) jointly constitute the three-phase rectifier The three-phase AC input ports of the device and the output ports of n single-phase rectifiers in each group of H-bridge cascaded rectifiers together constitute a set of DC output port groups of the three-phase rectifier device.

Here, after cascading the input ports of n single-phase rectifiers of each group of H-bridge cascaded rectifiers, a first input terminal (input1) and a second input terminal (input2) are formed, that is, three groups of H-bridges The cascade rectifier includes 3 first input terminals (input1) and 3 second input terminals (input2), the 3 first input terminals (input1) are connected to each other, and the 3 second input terminals (input2) together form a three-phase rectifier The three-phase AC input port of the device.

Preferably, the value of n is determined according to the voltage level of the external three-phase power supply and the rated input voltage of the single-phase rectifier. As an example, the input voltage level of the external three-phase power supply voltage may be 10kV, 6kV, 4.5kV, 3.5kV, 3kV and so on.

Here, the power electronic devices in the single-phase rectifier can be IGBT, MOSFET, GTR, thyristor, etc. The single-phase rectifier can choose power electronic devices of different voltage levels, and set the corresponding n value according to the voltage level of the external three-phase power supply ( The number of single-phase rectifiers of the H-bridge cascaded rectifier), so that the input voltage level of the three-phase rectifier device is compatible with the voltage level of the external three-phase power supply, and the application range of the voltage level is improved.

Preferably, it also includes an auxiliary inverter device 500, the input port of the auxiliary inverter device 500 is connected to the DC output port of the DC/DC conversion device 200, and the output port of the auxiliary inverter device 500 is connected to the auxiliary equipment 600 electrical connection.

Preferably, a reactor is connected in series with the three-phase AC input port of the three-phase rectifying device.

Preferably, as shown in Figure 2, the power electronic transformer 210 includes a single-phase full-bridge inverter, a high-frequency transformer 211 and a single-phase full-bridge rectifier connected in sequence, and the DC input of the single-phase full-bridge inverter port as the input port of the power electronic transformer, and the DC output port of the single-phase full-bridge rectifier as the output port of the power electronic transformer.

Preferably, a reactor and a capacitor are connected between the output port of the single-phase full-bridge inverter and the primary side of the high-frequency transformer 211, and the secondary side of the high-frequency transformer 211 is connected to the single-phase full-bridge inverter. Reactors and capacitors are connected between the input ports of the bridge rectifier. Here, the reactor and the capacitor can be connected in series to form a series resonant unit, which can reduce the eddy current loss of the medium and high frequency transformer winding, and further improve the efficiency of the power electronic transformer.

Preferably, a capacitor is connected in parallel to the DC input port of the single-phase full-bridge inverter, and a capacitor is connected in parallel to the DC output port of the single-phase full-bridge rectifier.

As another preference, as shown in FIG. 3 , the power electronic transformer 210 includes a single-phase half-bridge inverter, a high-frequency transformer 211 and a single-phase half-bridge rectifier connected in sequence, and the single-phase half-bridge inverter The DC input port of the power electronic transformer is used as the input port of the power electronic transformer, and the DC output port of the single-phase half-bridge rectifier is used as the output port of the power electronic transformer.

Preferably, a reactor and a capacitor are connected between the output port of the single-phase half-bridge inverter and the primary side of the high-frequency transformer, and the secondary side of the high-frequency transformer is connected to the single-phase half-bridge rectifier A reactor and a capacitor are connected between the input ports.

The above are only preferred implementations of the present invention, and it should be noted that the above preferred implementations should not be regarded as limiting the present invention, and the scope of protection of the present invention should be based on the scope defined in the claims. For those skilled in the art, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

A three-phase EMU traction drive power supply system, characterized in that it comprises:

A three-phase rectifier, including three-phase AC input ports and three sets of DC output port groups, each set of DC output port groups includes n DC output ports, where n≥1;

The DC/DC conversion device includes 3n independent power electronic transformers, the input port of each power electronic transformer is correspondingly connected to a DC output port of the three-phase rectification device, and the output port of each power electronic transformer is connected in parallel as the DC a DC output port of the /DC conversion device; and

A traction inverter device, the input port of the traction inverter device is connected to the DC output port of the DC/DC conversion device, and the output port of the traction inverter device is electrically connected to the traction motor.
A three-phase EMU traction drive power supply system according to claim 1, wherein the three-phase rectification device includes three sets of H-bridge cascaded rectifiers, and each set of H-bridge cascaded rectifiers includes n single-phase rectifiers , the input ports of n single-phase rectifiers in each group of H-bridge cascaded rectifiers are cascaded to form a first input terminal and a second input terminal, the three first input terminals are connected to each other, and the three second input terminals together form the described The three-phase AC input ports of the three-phase rectifier, and the output ports of n single-phase rectifiers in each group of H-bridge cascaded rectifiers together constitute a group of DC output ports of the three-phase rectifier.
The traction drive power supply system for three-phase EMUs according to claim 2, wherein the value of n is determined according to the voltage level of the external three-phase power supply and the rated input voltage of the single-phase rectifier.
A three-phase EMU traction drive power supply system according to claim 1, further comprising an auxiliary inverter device, the input port of the auxiliary inverter device is connected to the DC output port of the DC/DC conversion device connected, the output port of the auxiliary inverter device is electrically connected to the auxiliary equipment.
The traction drive power supply system for a three-phase EMU according to claim 1, wherein a reactor is connected in series at the three-phase AC input port of the three-phase rectifier.
A three-phase EMU traction drive power supply system according to claim 1, wherein the power electronic transformer comprises a single-phase full-bridge inverter, a high-frequency transformer and a single-phase full-bridge rectifier connected in sequence, the The DC input port of the single-phase full-bridge inverter is used as the input port of the power electronic transformer, and the DC output port of the single-phase full-bridge rectifier is used as the output port of the power electronic transformer.
A three-phase EMU traction drive power supply system according to claim 6, characterized in that a reactor and a reactor are connected between the output port of the single-phase full-bridge inverter and the primary side of the high-frequency transformer A capacitor, a reactor and a capacitor are connected between the secondary side of the high-frequency transformer and the input port of the single-phase full-bridge rectifier.
A three-phase EMU traction drive power supply system according to claim 6, wherein the DC input port of the single-phase full-bridge inverter is connected in parallel with a capacitor, and the DC output port of the single-phase full-bridge rectifier There are capacitors connected in parallel.
A three-phase EMU traction drive power supply system according to claim 1, wherein the power electronic transformer includes a single-phase half-bridge inverter, a high-frequency transformer and a single-phase half-bridge rectifier connected in sequence, so that The DC input port of the single-phase half-bridge inverter is used as the input port of the power electronic transformer, and the DC output port of the single-phase half-bridge rectifier is used as the output port of the power electronic transformer.
A three-phase EMU traction drive power supply system according to claim 9, characterized in that a reactor and a reactor are connected between the output port of the single-phase half-bridge inverter and the primary side of the high-frequency transformer A capacitor, a reactor and a capacitor are connected between the secondary side of the high-frequency transformer and the input port of the single-phase half-bridge rectifier.