Urban rail transit water-cooling bidirectional converter

Abstract

The urban rail transit water-cooling bidirectional converter comprises a converter cabinet and a water-cooling cabinet, the converter cabinet is internally provided with a DC wiring copper bar, an isolation switch, a contactor, a power module, a reactor, a circuit breaker, an AC wiring copper bar, a master control box and a logic control assembly, and the water-cooling cabinet is internally provided with a heat exchanger. The device is characterized in that the water-cooling cabinet and the converter cabinet are arranged in a split manner; a water-cooling input pipeline and a water-cooling output pipeline which are communicated with the water-cooling plate on the power module are arranged in the converter cabinet, a direct-current traction power grid of the rail transit is connected to a direct-current wiring end of the power module through a contactor and an isolating switch, and an alternating-current wiring end of the power module is connected to an alternating-current power grid through a reactor, a circuit breaker and a boosting transformer. Compared with air-cooling heat dissipation, the water-cooling bidirectional converter is high in heat exchange efficiency, large in power density, better in reliability and stability, longer in service life of internal key devices, low in noise, free of maintenance, high in assembly efficiency and low in cost.

Description

Technical Field

[0001] The utility model relates to a bidirectional current conversion device, and more specifically, to a water-cooled bidirectional current conversion device for urban rail transit. Background Art

[0002] As urban rail transit equipment has more and more comprehensive requirements for the application of power electronic products, the demand for the application of bidirectional converters has become more and more urgent. Heat generation is a common feature of power electronic products, and how to better improve the heat exchange efficiency is an urgent problem that power electronic products need to solve. However, bidirectional converters are power electronic products with relatively large heat generation. Conventional natural cooling or forced air cooling heat exchange methods have relatively low heat exchange efficiency, and more efficient heat exchange methods are relatively expensive. Therefore, the most cost-effective heat exchange method is water cooling. The application of water cooling to rail transit equipment is an inevitable trend.

[0003] At the same time, due to the high heat exchange efficiency of water cooling, the power density of the bidirectional converter can be raised to another level, greatly reducing the number of power units of the bidirectional converter and increasing the capacity of the bidirectional converter. The forced air cooling heat exchange method of the conventional bidirectional converter is easy to absorb dust in the air, which adheres to the electrical components and increases the failure rate, thereby increasing the overall failure rate of the device and affecting the stability and reliability of the device. At the same time, it also increases the workload of on-site maintenance, shortens the maintenance cycle, and increases a certain amount of maintenance costs.

[0004] At present, the problem of high noise in the traditional forced air cooling method of bidirectional converters in the urban rail transit industry is becoming more and more prominent. In order to fundamentally reduce the noise of the bidirectional converter, the water cooling method is used to remove the heat dissipation fan used in the traditional forced air cooling, which can effectively reduce the defect of high noise in the bidirectional converter. However, for the existing water-cooled bidirectional converters, one cabinet is used to accommodate the water cooling device and the bidirectional converter part, which makes it large in size and inconvenient to maintain. Therefore, this paper proposes a water-cooled bidirectional converter. Compared with the traditional forced air-cooled bidirectional converter, the water cooling cabinet and the converter cabinet of this water-cooled bidirectional converter are separated, which has the advantages of high heat exchange efficiency, high power density under the same volume, low overall noise, high cost performance, maintenance-free, high reliability and stability. Summary of the invention

[0005] In order to overcome the disadvantages of the above technical problems, the utility model provides a water-cooled bidirectional current converter for urban rail transit.

[0006] The utility model discloses a water-cooled bidirectional current converter for urban rail transit, comprising a current converter cabinet and a water cooling cabinet, wherein the current converter cabinet is provided with a DC wiring copper bar, an isolating switch, a contactor, a power module, an AC reactor, an AC circuit breaker, an AC wiring copper bar, a main control box and a logic control component, and the water cooling cabinet is provided with a heat exchanger, and the main control box and the logic control component are used to control the operation of the water-cooled bidirectional current converter; the utility model is characterized in that: the water cooling cabinet and the current converter cabinet are arranged in a split manner; the current converter cabinet is provided with a water-cooled input pipe and a water-cooled output pipe respectively connected to the water inlet and outlet of the water cooling plate on the power module, and the water-cooled input pipe and the water-cooled output pipe are connected to the heat exchanger in the water cooling cabinet; the DC traction power grid of the rail transit is connected to the DC wiring terminal of the power module via the contactor and the isolating switch, and the AC wiring terminal of the power module is connected to the AC power grid via the AC reactor, the AC circuit breaker and the step-up transformer.

[0007] The utility model discloses a water-cooled bidirectional current converter for urban rail transit. The converter cabinet is provided with a rectifier. The AC terminal of the rectifier is connected to a step-up transformer. The DC terminal of the rectifier is connected to a DC traction power grid via a contactor.

[0008] The utility model discloses a water-cooled bidirectional current converter for urban rail transit, wherein a film capacitor and a fuse are arranged in the current converter cabinet, and the film capacitor and the fuse are connected to the DC connection terminal of the power module; the DC connection copper busbar, the isolating switch and the contactor are connected through the connecting copper busbar, and the film capacitor, the fuse and the power module are connected through the connecting copper busbar.

[0009] The utility model discloses a water-cooled bidirectional current converter for urban rail transit, wherein the AC reactor, the AC circuit breaker, the AC wiring copper bus and the rectifier are connected via a large line.

[0010] The utility model discloses a water-cooled bidirectional converter for urban rail transit, wherein the AC wiring copper bar, the AC reactor, the DC wiring copper bar and the isolating switch are arranged at the bottom of the converter cabinet, the power module, the rectifier, the AC circuit breaker and the contactor are arranged in the middle of the converter cabinet, and the film capacitor and the fuse are arranged at the upper part of the converter cabinet.

[0011] The beneficial effects of the utility model are as follows: the urban rail transit water-cooled bidirectional converter device of the utility model is composed of a converter cabinet and a water-cooled cabinet. The converter cabinet is provided with a DC wiring copper bus, an isolating switch, a contactor, a power module, an AC reactor, an AC circuit breaker, an AC wiring copper bus, a main control box, a logic control component and a water-cooled input and output pipeline. The water-cooled cabinet and the converter cabinet are arranged in a split form, so that the water-cooled heat dissipation effect is better. The water-cooled input and output pipelines pass cooling circulating water to the water-cooled plate in the power module to take away the heat generated during the operation of the IGBT power device in the power module. Compared with the existing air-cooled heat dissipation, the heat exchange efficiency is high. Since the fan is omitted, the noise is lower, the power density is greater, and the reliability and stability are better. Since the air duct and the heat dissipation fan are removed, the assembly efficiency is high and the cost is lower. The water-cooled heat dissipation is conducive to maintaining a lower operating temperature of the power device, so that the service life of the key components in the converter cabinet is longer; and since there is no need to regularly clean and maintain the air inlet and the air outlet, it can be said that maintenance-free is achieved, which greatly reduces the workload on site and saves manpower and material resources.

[0012] Furthermore, by arranging a rectifier in the converter cabinet, and connecting the DC terminals of the rectifier to the DC traction grid via a contactor, and connecting the AC terminals of the rectifier to the step-up transformer, it is equivalent to connecting the rectifier and the power module in parallel. If a short circuit occurs in the circuit where the power module is located, the rectifier will take over its work, thereby ensuring uninterrupted traction of the rail transit equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of the water-cooled bidirectional current converter for urban rail transit of the utility model;

[0014] Figure 2 It is a rear view of the water-cooled bidirectional current converter for urban rail transit of the utility model;

[0015] Figure 3 , Figure 4 They are all three-dimensional diagrams of the water-cooled bidirectional current converter for urban rail transit of the utility model;

[0016] Figure 5 The utility model is a circuit schematic diagram of a water-cooled bidirectional current converter for urban rail transit.

[0017] In the figure: 1 converter cabinet, 2 water cooling cabinet, 3 DC wiring copper busbar, 4 isolating switch, 5 contactor, 6 film capacitor, 7 fuse, 8 power module, 9 AC reactor, 10 AC circuit breaker, 11 AC wiring copper busbar, 12 water cooling input pipeline, 13 water cooling output pipeline, 14 rectifier, 15 main control box, 16 logic control component. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 and Figure 2 As shown, the front view and rear view of the water-cooled bidirectional converter for urban rail transit of the utility model are respectively given. Figure 3 and Figure 4 The stereogram is given, and the water-cooled bidirectional converter for urban rail transit shown is composed of a converter cabinet 1 and a water-cooled cabinet 2. The converter cabinet 1 is provided with a DC connection copper bar 3, an isolating switch 4, a contactor 5, a film capacitor 6, a fuse 7, a power module 8, an AC reactor 9, an AC circuit breaker 10, an AC connection copper bar 11, a water-cooled input pipeline 12, a water-cooled output pipeline 13, a rectifier 14, a main control box 15 and a logic control component 16. The main control box 1 and the logic control component 16 are used to control the operation of the water-cooled bidirectional converter. The power module 8 can work in the inverter mode and the rectifier mode. When working in the rectifier mode, the AC power on the AC power grid is rectified into DC power and input into the DC traction power grid to meet the traction power supply of the rail transit equipment; when the power module 8 works in the inverter mode, the energy generated during the braking process of the rail transit equipment is inverted from the DC traction power grid and input into the AC power grid.

[0020] The water cooling cabinet 2 and the converter cabinet 1 are arranged in a split manner. A heat exchanger is arranged in the water cooling cabinet 2. The water cooling input pipe 12 and the water cooling output pipe 13 are respectively connected to the water inlet and the water outlet of the water cooling plate in the power unit 8. The water cooling input pipe 12 and the water cooling output pipe 13 are connected to the heat exchanger in the water cooling cabinet 2. In this way, when the water cooling cabinet 2 continuously passes circulating cooling water to the water cooling plate in the power module 8 through the water cooling input pipe 12 and the water cooling output pipe 13, the energy generated during the operation of the power device in the power module 8 can be taken away to ensure the stable operation of the power module 8.

[0021] It can be seen that since the urban rail transit water-cooled bidirectional converter device of the utility model adopts a circulating water cooling method, compared with the existing air cooling method, its heat exchange efficiency is higher, which can increase the power density of the converter cabinet, improve reliability and stability, and extend the service life of key components in the converter cabinet 1. Since the air-cooled fan is omitted, the noise is lower, and there is no need to regularly clean and maintain the air inlet and outlet, which can be said to be maintenance-free. Since the heat dissipation duct and heat dissipation fan are removed, the number of internal unit modules can be further reduced, reducing the overall volume, reducing the procurement cost, and improving the assembly efficiency of the bidirectional converter device.

[0022] like Figure 5As shown, a circuit schematic diagram of the water-cooled bidirectional converter for urban rail transit of the utility model is given. The DC connection terminal of the inverter module (i.e., the power module 8) is connected to the DC traction grid of the rail transit equipment via the isolating switch 4 and the contactor 5, and the AC connection terminal of the inverter module is connected to the AC grid via the AC reactor 9, the AC circuit breaker 10 and the step-up transformer. When the rail transit equipment (train) is normally pulled or accelerated, the power module 8 works in the rectification mode, and the AC power on the AC grid is rectified and input into the DC traction grid to provide traction power for the train. When the train brakes, the power module 8 works in the inverter mode, and feeds back the energy on the DC traction grid to the AC grid.

[0023] The AC terminals of the rectifier 14 shown are connected to the step-up transformer, and the DC terminals of the rectifier 14 are connected to the DC traction grid via the contactor 5, which is equivalent to connecting the rectifier 14 and the power module 8 in parallel. When a fault such as a short circuit occurs in the power module 8, the AC power output from the AC grid is rectified by the rectifier 14 and input into the DC traction grid to ensure uninterrupted traction of the rail transit equipment.

[0024] Film capacitor 6 and fuse 7 are connected to the DC connection terminal of power module 8; DC connection copper bar 3, disconnector 4 and contactor 5 are connected through the connection copper bar, and film capacitor 6, fuse 7 and power module 8 are connected through the connection copper bar. AC reactor 9, AC circuit breaker 10, AC connection copper bar 11 and rectifier 14 are connected through a large line.

[0025] In the converter cabinet 1, the AC connection copper bar 11, the AC reactor 9, the DC connection copper bar 3 and the isolating switch 4 are arranged at the bottom of the converter cabinet 1. Since the DC connection copper bar 3 and the AC connection copper bar 11 are both arranged at the bottom of the converter cabinet 1, it is convenient to access the cables connected thereto; since the AC reactor 9 is heavy and has a large volume, it is arranged at the bottom of the converter cabinet 1, which is conducive to the installation of the AC reactor 9. The power module 8, the rectifier 14, the AC circuit breaker 10 and the contactor 5 are arranged in the middle of the converter cabinet, and the film capacitor 6 and the fuse 7 are arranged at the upper part of the converter cabinet.

[0026] It can be seen that the water-cooled bidirectional converter for urban rail transit of the utility model has the following characteristics:

[0027] (1) High heat exchange efficiency, high power density, better reliability and stability, and longer service life of internal key components.

[0028] Since the heat exchange method of water cooling is used to dissipate heat for the internal key components, the gap between the components is reduced, the device layout is more compact, and at the same time the working current of the device is increased, the power density per unit volume is improved, and then the heat is dissipated by efficient water cooling heat exchange, the thermal stability of the device is improved, and the temperature rise of the device is ensured to be more uniform, thereby improving the stability and reliability of use and increasing the service life of the device.

[0029] (2) Low noise and maintenance-free.

[0030] Since the biggest inherent defect of the fan is high noise, for the urban rail transit industry, the fan used in the bidirectional converter has higher requirements for air volume, and the fan power selected will be relatively large, resulting in higher fan noise, and finally the noise of the bidirectional converter will be higher. Water cooling removes the cooling fan used in traditional forced air cooling, and uses water as a carrier to exchange heat with the heat exchanger for the heat generated by the key components, forming a closed loop. Hot water enters the heat exchanger, and cold water goes out of the heat exchanger, and then the heat is circulated infinitely. It can effectively control the noise in the bidirectional converter room and meet the low noise requirements. This bidirectional converter removes the air inlet and outlet required for forced air cooling, and the probability of dust entering the device is greatly reduced, thereby eliminating maintenance work and achieving a maintenance-free effect, greatly reducing the workload on site and saving manpower and material resources.

[0031] (3) High assembly efficiency and low cost.

[0032] Compared with the forced air-cooled bidirectional inverter device, the water-cooled bidirectional inverter device eliminates the heat dissipation duct, and then eliminates the sealing plate, support parts and other structural parts that make up the duct, and also eliminates the heat dissipation fan. The number of internal unit modules can be further reduced, and the volume of the whole machine is further reduced, which reduces the procurement cost, improves the assembly efficiency of the bidirectional inverter device, and thus reduces the overall cost.

Claims

1. A water-cooled bidirectional current converter for urban rail transit, comprising a current converter cabinet (1) and a water cooling cabinet (2), wherein the current converter cabinet is provided with a DC wiring copper bar (3), an isolating switch (4), a contactor (5), a power module (8), an AC reactor (9), an AC circuit breaker (10), an AC wiring copper bar (11), a main control box (15) and a logic control component (16), wherein the water cooling cabinet is provided with a heat exchanger, and the main control box and the logic control component are used to control the operation of the water-cooled bidirectional current converter; characterized in that: The water cooling cabinet and the converter cabinet are arranged in a split manner; the converter cabinet is provided with a water cooling input pipe (12) and a water cooling output pipe (13) which are respectively connected to the water inlet and outlet of the water cooling plate on the power module (8); the water cooling input pipe and the water cooling output pipe are connected to the heat exchanger in the water cooling cabinet; the DC traction power grid of the rail transit is connected to the DC connection terminal of the power module (8) via a contactor and an isolating switch, and the AC connection terminal of the power module is connected to the AC power grid via an AC reactor, an AC circuit breaker and a step-up transformer.

2. The water-cooled bidirectional converter for urban rail transit according to claim 1, characterized in that: The converter cabinet (1) is provided with a rectifier (14), the AC connection terminal of the rectifier is connected to the step-up transformer, and the DC connection terminal of the rectifier is connected to the DC traction power grid via a contactor (5).

3. The water-cooled bidirectional converter for urban rail transit according to claim 2, characterized in that: The converter cabinet (1) is provided with a film capacitor (6) and a fuse (7), and the film capacitor and the fuse are connected to the DC connection terminal of the power module (8); the DC connection copper busbar (3), the isolating switch (4) and the contactor (5) are connected via the connecting copper busbar, and the film capacitor, the fuse and the power module are connected via the connecting copper busbar.

4. The water-cooled bidirectional converter for urban rail transit according to claim 2, characterized in that: The AC reactor (9), the AC circuit breaker (10), the AC wiring copper busbar (11) and the rectifier (14) are connected via a large wire.

5. The water-cooled bidirectional converter for urban rail transit according to claim 3, characterized in that: The AC connection copper busbar (11), the AC reactor (9), the DC connection copper busbar (3) and the isolating switch (4) are arranged at the bottom of the converter cabinet (1); the power module (8), the rectifier (14), the AC circuit breaker (10) and the contactor (5) are arranged in the middle of the converter cabinet; and the film capacitor (6) and the fuse (7) are arranged at the top of the converter cabinet.

Images