An AC auxiliary converter suitable for use in an internal combustion engine vehicle

Abstract

The application relates to an alternating-current auxiliary converter suitable for an internal combustion engine vehicle, which is connected with a permanent magnet generator through a cable and supplies power for the permanent magnet generator, the permanent magnet generator is connected with a diesel engine, the alternating-current auxiliary converter comprises an AC / DC rectifier, one end of the AC / DC rectifier is connected with the permanent magnet generator, the other end is connected with an ultra-wideband DC / DC voltage stabilizing converter, the other end of the DC / DC voltage stabilizing converter is output to a plurality of DC / AC inverters through a direct-current bus, and the DC / AC inverters are connected with corresponding devices. The alternating-current auxiliary converter has the remarkable characteristics of small overall size, wide alternating-current input range, low-voltage control and multi-path high-voltage output, solves the problem of insufficient space for electrical and mechanical layout, and the size of each system component is simplified on the basis of meeting the functional design.

Description

Technical Field

[0001] This invention belongs to the technical field of AC auxiliary converters and relates to an AC auxiliary converter suitable for internal combustion locomotives. Background Technology

[0002] In my country's urban rail transit, diesel locomotives are powered by diesel engines. Auxiliary transmission systems primarily employ hydraulic transmission or are powered by AC or DC generator sets. The auxiliary system loads mainly consist of air compressors, diesel engine cooling fans, and electricity for the driver's living quarters. Air compressors are often driven by diesel engine belt drives, while diesel engine cooling fans typically use hydraulic couplings. Living quarters are usually powered by constant-speed, constant-voltage, industrial-frequency auxiliary generator sets. Some engineering vehicles also require external power supplies for cranes, electric drills, welding machines, etc., which also utilize industrial-frequency generator sets. The auxiliary power supplied by these industrial-frequency generator sets is 380V / 50Hz three-phase AC, directly driving the motor loads such as cooling fans, ventilators, and air compressors. The fan motors are variable-speed motors, only allowing for high-speed and low-speed regulation, and cannot achieve frequency conversion control for the fan motors and air compressors. Therefore, startup places a significant impact on the power supply, shortening the lifespan of the motors and other electrical components. Some urban rail transit diesel locomotives also use DC motors for their air compressors, which are powered by DC generator sets. The onboard auxiliary systems need to be equipped with both DC and AC generator sets, resulting in complex mechanical structures and a high failure rate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and propose an AC auxiliary converter suitable for internal combustion locomotives. This AC auxiliary converter has a small overall size, a wide AC input range, low-voltage control, and multiple high-voltage outputs. The auxiliary system using this AC auxiliary converter eliminates the need for the excitation control device or controllable rectifier device of the traditional diesel generator set, resulting in low cost, space saving, and improved work efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An AC auxiliary converter suitable for internal combustion locomotives is characterized in that the AC auxiliary converter is connected to and supplies power to a permanent magnet generator via a cable, the permanent magnet generator is connected to a diesel engine, the AC auxiliary converter includes an AC / DC rectifier, one end of the AC / DC rectifier is connected to the permanent magnet generator, the other end is connected to an ultra-wideband DC / DC voltage regulator, and the other end of the DC / DC voltage regulator outputs to multiple DC / AC inverters via a DC bus, the DC / AC inverters being connected to corresponding equipment.

[0006] Furthermore, a total of four DC / AC inverters are provided, three of which are variable frequency DC / AC inverters and one is a fixed frequency DC / AC inverter. The variable frequency DC / AC inverters are connected to motors, and the fixed frequency DC / AC inverters are connected to domestic power supply through transformers. The three variable frequency DC / AC inverters are respectively connected to two diesel engine cooling fan motors and one air compressor motor.

[0007] Furthermore, the AC auxiliary converter includes a housing, on one side of which an input fuse and a DC-DC voltage regulator are arranged sequentially from top to bottom, and on the other side of which a DCAC module, a CVCF external power supply inverter module and an isolation transformer are arranged sequentially from top to bottom.

[0008] Furthermore, a capacitor for filtering is provided on the outside of the input fuse.

[0009] Furthermore, a CVCF residential power inverter module is installed adjacent to the isolation transformer.

[0010] Furthermore, a DY module, an ACU, an IO-485 module, and a terminal block are also provided on the same horizontal plane at the position corresponding to the fuse inside the enclosure.

[0011] Furthermore, an uncontrolled AC / DC rectifier is also provided on the same horizontal plane at the position corresponding to the capacitor inside the box.

[0012] Furthermore, one side of the enclosure is provided with an X1 terminal for auxiliary converter AC input, an X2 terminal for connecting the first diesel engine cooling fan motor, an X3 terminal for connecting the second diesel engine cooling fan motor, an X4 terminal for connecting the air compressor motor, a domestic power output port, an external power output port, control signals, and a debugging port.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This AC auxiliary converter features a small overall size, a wide AC input range, low-voltage control, and multiple high-voltage outputs. The AC auxiliary power supply system includes a permanent magnet generator, auxiliary converter, diesel engine cooling fan, and air compressor. Despite the limitations imposed by locomotive dimensions, it solves the problem of insufficient space for electrical and mechanical layout. The dimensions of each system component are streamlined while still meeting functional design requirements. It provides AC235V / 56.67Hz~635V / 140Hz three-phase AC power supply to accommodate a wide range of voltage amplitude and frequency variations in diesel generator sets. The auxiliary system using this AC auxiliary converter eliminates the need for traditional diesel generator excitation control devices or controllable rectifiers, resulting in lower costs, space savings, and significantly improved efficiency.

[0015] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the auxiliary converter structure layout of the present invention;

[0019] Figure 2 This is a rear view of the auxiliary converter structure layout of the present invention;

[0020] Figure 3 This is a side view of the auxiliary converter structure layout of the present invention;

[0021] Figure 4 This is a topology diagram of the system structure where the auxiliary converter of this invention is located;

[0022] The components include: 1. Fuse; 2. Capacitor; 3. DC-DC voltage regulator; 4. DC-AC module; 5. CVCF residential power inverter module; 6. Isolation transformer; 7. CVCF external power inverter module; 8. DY module; 9. ACU; 10. IO-485 module; 11. Terminal block; 12. AC / DC uncontrolled rectifier; 13. X1 terminal; 14. X2 terminal; 15. X3 terminal; 16. X4 terminal; 17. Residential power output via; 18. External power output via; 19. Control signal; 20. Debugging port; 21. Permanent magnet generator; 22. Diesel engine. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Example:

[0026] An AC auxiliary converter suitable for internal combustion locomotives is disclosed. The AC auxiliary converter is connected to and supplies power to a permanent magnet generator 21 via a cable. The permanent magnet generator is connected to a diesel engine 22. The AC auxiliary converter includes an AC / DC rectifier. One end of the AC / DC rectifier is connected to the permanent magnet generator 21, and the other end is connected to an ultra-wideband DC / DC voltage regulator. The other end of the DC / DC voltage regulator outputs to multiple DC / AC inverters via a DC bus. The DC / AC inverters are connected to corresponding equipment. A total of four DC / AC inverters are provided, three of which are variable frequency DC / AC inverters and one is a fixed frequency DC / AC inverter. The variable frequency DC / AC inverters are connected to motors, and the fixed frequency DC / AC inverters are connected to domestic power supply via transformers. Two diesel engine cooling fan motors and one air compressor motor are connected to the three variable frequency DC / AC inverters, respectively.

[0027] The AC auxiliary converter includes a housing. On one side of the housing, from top to bottom, are arranged an input fuse 1 and a DC-DC voltage regulator 3. The input fuse is used to prevent generator current imbalance. On the other side of the housing, from top to bottom, are arranged a DCAC module 4, a CVCF external power inverter module 7, and an isolation transformer 6. A filter capacitor 2 is installed outside the input fuse 1. A CVCF residential power inverter module 5 is located adjacent to the isolation transformer 6. On the same horizontal plane corresponding to the DCAC module 4, inside the housing, are a DY module 8, an ACU 9, an IO-485 module 10, and a terminal block 11. On the same horizontal plane corresponding to the fuse 1, inside the housing, is an AC / DC uncontrolled rectifier 12. On the same horizontal plane corresponding to the capacitor 2, inside the housing, is another AC / DC uncontrolled rectifier. The enclosure has an X1 terminal 13 for auxiliary converter AC input, an X2 terminal 14 for connecting the first diesel engine cooling fan motor, an X3 terminal 15 for connecting the second diesel engine cooling fan motor, an X4 terminal 16 for connecting the air compressor motor, a domestic power output port 17, an external power output port 18, a control signal port 19, and a debugging port 20 on one side. The DC-DC voltage regulator 3 ensures a stable output of rectified DC voltage at a constant value. The DC-AC module 4 controls the diesel engine cooling fan motor. The CVCF household power inverter module 5 converts DC power into AC power. The isolation transformer 6 isolates the AC power from the household power supply. The CVCF external power inverter module 7 provides a stable AC power supply to the vehicle. The DY module 8 is used for low-voltage power conversion. The ACU module 9 interacts with the host computer for data exchange and system management and control. The IO-485 module 10 is responsible for signal acquisition and conversion. The X1 terminal 13 is the AC input for the auxiliary converter cabinet. The X2 terminal 14 is used to connect to the diesel engine cooling fan motor 1. The X3 terminal 15 is used to connect to the diesel engine cooling fan motor 2. The X4 terminal 16 is used to connect to the air compressor motor.

[0028] The diesel engine drives a permanent magnet generator, operating at 800–2100 rpm, outputting AC 235–635V three-phase AC voltage. The three-phase AC power generated by the permanent magnet synchronous generator is connected to an auxiliary converter via cables, supplying power to the auxiliary converter. The auxiliary converter uncontrollably rectifies the three-phase AC voltage, which varies in amplitude and frequency, and then provides it to a DC-DC converter, which outputs a relatively stable DC voltage of 600V ± 10V. The DC bus simultaneously supplies power to the domestic auxiliary inverter, two sets of diesel engine cooling fan motor inverters, an air compressor control inverter, and an external power supply inverter. Based on the locomotive's requirements, it uses frequency conversion to control the diesel engine cooling fan and air compressor, providing 380V / 50Hz domestic power and external power supply. The external power supply function is optional depending on the locomotive model. The system and auxiliary converter structure consists of: an AC / DC uncontrolled rectifier, a DC / DC regulated converter, a VVVF (DC / AC) inverter and a CVCF (DC / AC) residential inverter, an external power supply inverter, a controller module, and various input and output ports.

[0029] The AC auxiliary converter cabinet and electric drive system have a transmission efficiency 5%-10% higher than hydraulic transmission, and there are no leakage or environmental pollution problems. The auxiliary converter's internal converter modules adopt a common DC bus scheme, which improves system efficiency by 5% and reduces size by 30% compared to a common AC bus scheme. Compared to hydraulic transmission, the output power can be flexibly adjusted according to load requirements, achieving energy savings. It eliminates the need for an external electric excitation control system, achieving maintenance-free operation and reducing manufacturing costs, resulting in high efficiency and low noise. It solves the problems of belt-driven air compressors, such as inability to operate intermittently, high failure rate, high wear, and short lifespan, by using variable frequency starting to effectively reduce the starting current surge of the air compressor motor. Domestic power is supplied by an inverter and isolation transformer, effectively utilizing the auxiliary power of the diesel engine.

[0030] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0031] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. An AC auxiliary converter suitable for internal combustion locomotives, characterized in that, The AC auxiliary converter is connected to and supplies power to the permanent magnet generator (21) via a cable. The permanent magnet generator is connected to the diesel engine (22). The AC auxiliary converter includes an AC / DC rectifier, an ultra-wideband DC / DC voltage regulator, and multiple DC / AC inverters. One end of the AC / DC rectifier is connected to the permanent magnet generator (21), and the other end is connected to the ultra-wideband DC / DC voltage regulator. The other end of the DC / DC voltage regulator is output to multiple DC / AC inverters via a DC bus. The DC / AC inverters are connected to their corresponding power supply or control equipment. The AC auxiliary converter includes a housing. An input fuse (1) and a DC-DC voltage regulator (3) are arranged sequentially from top to bottom on one side of the housing. A DCAC module (4), a CVCF external power supply inverter module (7), and an isolation transformer (6) are arranged sequentially from top to bottom on the other side of the housing. The box is also equipped with a DY module (8), an ACU (9), an IO-485 module (10) and a terminal block (11) on the same horizontal plane as the DCAC module (4). The box is also equipped with an AC / DC uncontrolled rectifier (12) at the position corresponding to the fuse (1). The enclosure is provided with an X1 terminal (13) for auxiliary converter AC input, an X2 terminal (14) for connecting the first diesel engine cooling fan motor, an X3 terminal (15) for connecting the second diesel engine cooling fan motor, an X4 terminal (16) for connecting the air compressor motor, a domestic power output port (17), an external power output port (18), a control signal (19), and a debugging port (20) on one side.

2. The AC auxiliary converter for internal combustion locomotives according to claim 1, characterized in that, There are a total of 4 DC / AC inverters, 3 of which are variable frequency DC / AC inverters and the other is a fixed frequency DC / AC inverter. The variable frequency DC / AC inverters are connected to motors, and the fixed frequency DC / AC inverters are connected to domestic power supply through transformers. The 3 variable frequency DC / AC inverters are respectively connected to two diesel engine cooling fan motors and one air compressor motor.

3. The AC auxiliary converter for internal combustion locomotives according to claim 1, characterized in that, The input fuse (1) is provided with a capacitor (2) for filtering.

4. The AC auxiliary converter for internal combustion locomotives according to claim 1, characterized in that, A CVCF residential power inverter module (5) is installed adjacent to the isolation transformer (6).

5. An AC auxiliary converter suitable for internal combustion locomotives according to claim 3, characterized in that, An uncontrolled AC / DC rectifier is also provided on the same horizontal plane as the capacitor (2) inside the box.

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