Traction inverter

Abstract

This application provides a traction inverter, including a housing and power units. The housing has multiple isolated chambers. The power units include a first power module and a second power module, which are located in different chambers. The first power module includes at least two interconnected first power components, and the second power module includes at least two interconnected second power components. Each first power component is connected to each second power component, and the first and second power components are used to jointly drive at least four traction motors. The traction inverter of this application embodiment can improve the DC-AC conversion capability of the power units within the traction inverter and reduce the damage rate of the power units due to overload, thereby reducing the damage rate of the traction inverter.

Description

Technical Field

[0001] This application relates to the field of vehicle component technology, and more particularly to a traction inverter. Background Technology

[0002] The traction inverter is a key component of a high-speed train, installed at the bottom of the train. Its main function is to convert electrical energy between DC and AC systems, and to control the starting, braking, and speed regulation of the AC traction motor through voltage and frequency regulation. With the continuous development of transportation, the traction inverter, as a key component of the train, is also constantly improving, thus being able to continuously match the high-performance requirements of rail trains and convert sufficient electrical energy for them.

[0003] In related technologies, electric multiple units (EMUs) typically include four traction motors to provide power. The inverters driving these four traction motors usually employ axle-controlled, frame-controlled, or vehicle-controlled power configurations. The axle-controlled power configuration involves four power units in the traction inverter, each driving one traction motor independently. The frame-controlled power configuration involves two identical power units in the traction inverter, each driving two traction motors. The vehicle-controlled configuration uses only one power unit in the traction inverter to simultaneously drive all four traction motors. Therefore, the vehicle-controlled power configuration requires fewer power units than the other two configurations, thus reducing the manufacturing cost of the EMU.

[0004] However, under the above vehicle control power configuration, the DC-AC conversion capability of the power unit in the traction inverter is weak, which can easily lead to damage to the power unit due to overload, thereby causing damage to the traction inverter. Summary of the Invention

[0005] In view of the above problems, this application provides a traction inverter that can improve the DC-AC conversion capability of the power unit in the traction inverter, reduce the damage rate of the power unit due to overload, and thus reduce the damage rate of the traction inverter.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] This application provides a traction inverter, which includes: a housing and a power unit. The housing has multiple mutually isolated chambers, and the power unit includes a first power module and a second power module, which are located in different chambers respectively.

[0008] The first power module includes at least two interconnected first power components, and the second power module includes at least two interconnected second power components, with each first power component connected to each second power component. The first power components and the second power components are used to jointly drive at least four traction motors.

[0009] Based on the above technical solution, the following improvements can be made to this application.

[0010] In one possible implementation, the first power component includes a V-phase group and a U-phase group connected in parallel, wherein the V-phase group has at least two interconnected V-phase elements and the U-phase group has at least two interconnected U-phase elements.

[0011] The second power component includes a W-phase group, which has at least two interconnected W-phase elements.

[0012] The V-phase component is used to connect to the V-phase of the traction motor corresponding to the V-phase component;

[0013] The U-phase component is used to connect to the U-phase of the traction motor corresponding to the U-phase component;

[0014] The W-phase component is used to connect to the W-phase of the traction motor corresponding to the W-phase component.

[0015] In one possible implementation, a plurality of mutually isolated chambers include a first power chamber and a second power chamber, the first power chamber and the second power chamber are arranged opposite to each other along a first direction, the first power module is located in the first power chamber, and the second power module is located in the second power chamber.

[0016] In one possible implementation, a braking chopper group is also included, which is located in the second power chamber and is used to control the connection and disconnection between the traction motor and the braking resistor.

[0017] The braking chopper assembly includes a first braking chopper and a second braking chopper connected in parallel.

[0018] In one possible implementation, a first heat sink and a second heat sink are also included;

[0019] The first heat sink is connected to one side of the first power chamber and is in communication with the first power chamber so as to dissipate the heat generated by the first power module during operation through the first heat sink.

[0020] The second heat sink is connected to one side of the second power chamber and is in communication with the second power chamber so as to dissipate the heat generated by the second power module during operation through the second heat sink.

[0021] In one possible implementation, both the first heat sink and the second heat sink are detachably connected to the outer side wall of the housing. The first heat sink extends along a second direction, and the second heat sink extends in the same direction as the first heat sink. The second direction is perpendicular to the first direction.

[0022] In one possible implementation, a first heat dissipation component and a second heat dissipation component are also included;

[0023] The first heat dissipation component is located inside the first heat dissipation shroud. Part of the first heat dissipation component is located inside the first power cavity and connected to the first power module to dissipate heat from the first power module.

[0024] The second heat dissipation component is located inside the second heat dissipation shroud. The second heat dissipation component is partially located inside the second power cavity and connected to the second power module to dissipate heat from the second power module.

[0025] In one possible implementation, the first heat dissipation component includes a first substrate and a first heat dissipation element connected to the first substrate. The first heat dissipation element is located inside a first heat dissipation shroud, the first substrate is located inside a first power chamber, and the first power module is disposed on the first substrate.

[0026] The second heat dissipation assembly includes a second substrate and a second heat dissipation component connected to the second substrate. The second heat dissipation component is located inside the second heat dissipation shroud, the second substrate is located inside the second power chamber, and the second power module is disposed on the second substrate.

[0027] In one possible implementation, a filtering component is also included, comprising multiple mutually isolated chambers including a ventilation duct chamber and a filtering chamber connected to the ventilation duct chamber, the ventilation duct chamber extending along a second direction, the two ends of the extending direction of the ventilation duct chamber being connected to the outside.

[0028] Part of the filter assembly is located inside the filter chamber, which in turn is located inside the ventilation duct chamber.

[0029] In one possible implementation, the filtering component includes a filter reactor and a fan, with the fan located near one end of the ventilation duct chamber in the direction of extension. The filter reactor is connected to the U-phase group, V-phase group, and W-phase group in the first power component. The filter reactor is used to filter the DC power and deliver the filtered DC power to the U-phase group, V-phase group, and W-phase group.

[0030] The fan is used to exhaust the heat generated by the filter reactor into the housing through the ventilation duct chamber.

[0031] In one possible implementation, the ventilation duct chamber is located between the first power chamber and the second power chamber;

[0032] The first power chamber and the ventilation duct chamber are connected by an openable first inspection door;

[0033] The second power chamber and the ventilation duct chamber are connected by an openable second inspection door.

[0034] This application provides a traction inverter that improves the DC-AC conversion capability of the power unit, reduces the damage rate of the power unit, and lowers the failure rate of the traction inverter by setting at least two interconnected first power components in a first power module and at least two interconnected second power components in a second power module, and using the first power components and the second power components together for DC-AC conversion of the traction inverter. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the traction inverter provided in the embodiments of this application;

[0037] Figure 2 This is a partial circuit diagram of the traction inverter provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the internal structure of the traction inverter provided in the embodiments of this application;

[0039] Figure 4 for Figure 3 A schematic diagram of the external structure of the traction inverter enclosure, viewed from the voltage output side.

[0040] Figure 5 for Figure 3 A schematic diagram of the AA section of the traction inverter in the diagram;

[0041] Figure 6 for Figure 3 A schematic diagram showing the connection relationship between the first power module and the first heat dissipation component.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100 - Box;

[0044] 110 - First heat sink; 120 - Second heat sink; 130 - First heat dissipation component;

[0045] 131 - First substrate; 132 - First heat sink;

[0046] 140 - Second heat dissipation component;

[0047] 141 - Second substrate; 142 - Second heat sink;

[0048] 150 - High voltage input zone; 160 - High voltage output zone;

[0049] 170 - Contactor assembly;

[0050] 171 - Pre-charge contactor; 172 - Line contactor;

[0051] 180 - Low-voltage input / output area;

[0052] 200-Power Unit;

[0053] 210 - First Power Module;

[0054] 211 - First power component;

[0055] 2111-V phase group;

[0056] 21111-V phase component;

[0057] 2112-U phase group;

[0058] 21121-U phase component;

[0059] 220 - Second Power Module;

[0060] 221 - Second power component;

[0061] 2211-W phase group;

[0062] 22111-W phase component;

[0063] 300-chamber;

[0064] 310 - First power chamber; 320 - Second power chamber; 330 - Ventilation duct chamber;

[0065] 331 - First inspection door; 332 - Second inspection door; 333 - First ventilation hood;

[0066] 334 - Second ventilation hood;

[0067] 340 - Filter chamber; 350 - Low-pressure chamber;

[0068] 351 - Third Inspection Door;

[0069] 360-High-Pressure Chamber;

[0070] 361 - Fourth inspection door; 362 - First voltage sensor; 363 - Second voltage sensor;

[0071] 400-Traction Motor;

[0072] 500-braking chopper assembly;

[0073] 510 - First braking chopper; 520 - Second braking chopper;

[0074] 600 - Braking resistor;

[0075] 700-Filter Component;

[0076] 710 - Filter reactor; 720 - Fan; 730 - First filter capacitor;

[0077] 740 - Second filter capacitor; 750 - Anti-reverse group. Detailed Implementation

[0078] As described in the background section, electric multiple units (EMUs) in related technologies typically use four traction motors to provide power. The connection method between the four traction motors and the traction inverter is determined by the three power configuration methods of the EMU: axle control, frame control, or vehicle control. Axle control involves four power units in the traction inverter, each driving one traction motor independently. Frame control involves two identical power units in the traction inverter, connected at their input sides but not at their output sides; each power unit drives only two traction motors. Vehicle control, on the other hand, uses one power unit within the traction inverter to simultaneously drive all four traction motors, connected not only at the input but also at the output. Therefore, vehicle control requires fewer power units than the other two configurations, thus reducing the manufacturing cost of the EMU.

[0079] The inventors discovered that under the vehicle control method of the aforementioned related technologies, the AC / DC conversion capability of the power unit in the traction inverter is weak, which puts the power unit in an overload working environment and causes the power unit to heat up severely. When the heat generated exceeds the range that the junction temperature of the power unit can withstand, it will cause damage to the power unit, thereby causing damage to the traction inverter.

[0080] To address the aforementioned technical problems, this application provides a traction inverter. By setting at least two interconnected first power components in a first power module and at least two interconnected second power components in a second power module, and using the first power components and second power components together for the DC-AC conversion of the traction inverter, the DC-AC conversion capability of the power unit is improved, the damage rate of the power unit is reduced, and the failure rate of the traction inverter is reduced.

[0081] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0082] refer to Figure 2 and Figure 3 This application provides a traction inverter, which includes a housing 100 and a power unit 200. The housing 100 has multiple isolated chambers 300. The power unit 200 includes a first power module 210 and a second power module 220, which are located in different chambers 300. The first power module 210 includes at least two interconnected first power components 211, and the second power module 220 includes at least two interconnected second power components 221. Each first power component 211 is connected to each second power component 221, and the first power components 211 and the second power components 221 are used to jointly drive at least four traction motors 400.

[0083] In some embodiments, the traction inverter comprises at least a housing 100 and a power unit 200. The power unit 200 is disposed within the housing 100 and converts the direct current input from the external power grid into three-phase alternating current, which is then transmitted to the traction motor 400 to drive the train. The housing 100 is internally divided into multiple isolated chambers 300, and the components of the traction inverter are installed within the corresponding chambers 300, thereby creating a modular layout within the traction inverter and improving the space utilization and layout rationality within the housing 100.

[0084] refer to Figure 3In this embodiment, the power unit 200 is divided into a first power module 210 and a second power module 220, and these two power modules are respectively installed in two corresponding chambers 300. This prevents the wiring connections between components from becoming too complex when all components are in one power module, which would hinder the maintenance of the internal components of the power unit 200 and make the connections between the internal components of the power unit 200 and other components in the traction inverter more complex. Furthermore, placing the first power module 210 and the second power module 220 in two corresponding chambers 300 ensures that the heat generated by either the first power module 210 or the second power module 220 is significantly lower than the heat generated by the power unit 200 without the division. Therefore, dividing the power unit 200 into the first power module 210 and the second power module 220 improves the heat dissipation efficiency of the power unit 200 and reduces the rate of damage due to overheating.

[0085] refer to Figure 2 In practical implementation, the power unit 200 can convert the DC power input from the power grid into three-phase AC power (U / V / W) to power the four traction motors 400. The power unit 200 is divided into a first power module 210 and a second power module 220 that are connected to each other. Therefore, the DC power needs to be converted into three-phase AC power through the combined action of the two power modules. Thus, all four traction motors 400 need to be connected to the first power module 210 and the second power module 220 simultaneously, and the DC power from the power grid also needs to flow into the first power module 210 and the second power module 220 simultaneously. The first power module 210 and the second power module 220 are then turned on in sequence according to a preset conduction order to convert the DC power into three-phase AC power.

[0086] In a specific implementation, the first power module 210 and the second power module 220 can be connected in parallel, so that both the first power module 210 and the second power module 220 can be connected to each traction motor 400 at the same time.

[0087] It is important to note that the AC power converted by the first power module 210 and the second power module 220 has different phases, and the two modules can work together to form the three-phase AC power required by the traction motor 400. For example, when the first power module 210 is used to convert any two phases of the three-phase AC power, the second power module 220 can only convert the remaining phase of the AC power, and vice versa.

[0088] In this embodiment, the first power module 210 may include at least two interconnected first power components 211, and the second power module 220 may include at least two interconnected second power components 221. The first power components 211 and the second power components 221 are interconnected and work together to convert the DC power from the power grid into the three-phase AC power required by the traction motor 400.

[0089] It should be noted that each first power component 211 can generate alternating current of the same phase, and similarly, each second power component 221 can also generate alternating current of the same phase. When the first power module 210 is used to generate alternating current of two phases, each first power component 211 inside it can also generate alternating current of those two phases, while each second power component 221 located in the second power module 220 can generate alternating current of the remaining phase.

[0090] refer to Figure 2 In specific implementation, the number of first power components 211 is the same as the number of second power components 221 to ensure that the conversion amount of AC power in each phase is the same. The interconnection method between the first power components 211 can be parallel; the interconnection method between the second power components 221 is the same as the connection method between the first power components 211.

[0091] Continue to refer to Figure 2 In some embodiments, when the first power components 211 are connected in parallel, the second power components 221 are also connected in parallel. That is, the first power module 210 and the second power module 220 are connected in parallel, and the first power components 211 within the first power module 210 are connected in parallel, as are the second power components 221 within the second power module 220. Compared to the prior art, the first power module 210 and the second power module 220 using this parallel connection method can withstand a larger amount of DC power from the grid and convert it into a larger amount of AC power to power the traction motor 400, thereby improving the AC / DC conversion capability of the traction inverter.

[0092] In an exemplary embodiment, the maximum speed requirement of the train is 100 km / h, and the current required for the motor input is increased to 1068A. Considering factors such as overload and safety margin, the current calculation value of the IGBT used for the inverter is 2102A. To meet the increased system capacity requirements, for example, when the train speed is 100 km / h, the current required for the motor input is at least 1068A. When the DC current in the power grid is 1200A, the maximum current that each first power component 211 and second power component 221 can withstand is 800A. If only one first power component 211 and one second power component 221 are connected to each other, both the first power component 211 and the second power component 221 will be in an overload state, which may easily lead to damage to the two power components due to overload. If two identical first power components 211 are connected in parallel, so that the 1200A DC current is equally shared between the two first power components, that is, the current allocated to each first power component 211 is 600A, each first power component 211 will operate normally. Similarly, after two identical second power components 221 are connected in parallel, the current on each second power component 221 is also 600A, and it can also operate normally. Therefore, by connecting at least two first power components 211 and at least two second power components 221 in parallel, the maximum current value that the first power module 210 and the second power module 220 can convert can be increased, thereby improving the DC-AC conversion capability of the power unit 200.

[0093] This application provides a traction inverter, which improves the DC-AC conversion capability of the power unit 200, reduces the damage rate of the power unit 200, and reduces the failure rate of the traction inverter by setting at least two interconnected first power components 211 in the first power module 210 and at least two interconnected second power components 221 in the second power module 220, and using the first power components 211 and the second power components 221 together for the DC-AC conversion of the traction inverter.

[0094] refer to Figure 2 In some embodiments, the first power component 211 includes a V-phase group 2111 and a U-phase group 2112 connected in parallel. The V-phase group 2111 has at least two V-phase elements 21111 connected in series, and the U-phase group 2112 has at least two U-phase elements 21121 connected in series. The second power component 221 includes a W-phase group 2211, which has at least two W-phase elements 22111 connected in series. The V-phase elements 21111 are used to connect to the V-phase of the traction motor 400 corresponding to the V-phase element 21111. The U-phase elements 21121 are used to connect to the U-phase of the traction motor 400 corresponding to the U-phase element 21121. The W-phase elements 22111 are used to connect to the W-phase of the traction motor 400 corresponding to the W-phase element 22111.

[0095] refer to Figure 2 In this embodiment, each first power component 211 and each second power component 221 converts the DC power input from the power grid into U / V / W three-phase AC power. Each first power component 211 may include a U-phase group 2112 and a V-phase group 2111 connected in parallel, and the U-phase group 2112 and the V-phase group 2111 are respectively connected to the U-phase and V-phase of each traction motor 400. The U-phase group 2112 is used to convert DC power into U-phase AC power and supply it to the U-phase of the traction motor 400, and the V-phase group 2111 is used to convert DC power into V-phase AC power and supply it to the V-phase of the traction motor 400. Each second power component 221 may include a W-phase group 2211, which is connected to the W-phase of each traction motor 400, and is used to convert DC power into W-phase AC power and supply it to the W-phase of the traction motor 400.

[0096] Specifically, when the first power module 210 contains two parallel first power components 211, the second power module 220 contains two parallel second power components 221. The first power module 210 also includes two parallel U-phase groups 2112 and two parallel V-phase groups 2111, and the U-phase groups 2112 and V-phase groups 2111 are also connected in parallel. The second power module 220 also includes two parallel W-phase groups 2211, and the two W-phase groups 2211 are also connected in parallel with the two U-phase groups 2112 and the two V-phase groups 2111.

[0097] By setting the U-phase group 2112 and V-phase group 2111 in the first power module 210 and the W-phase group 2211 in the second power module 220, and connecting the U-phase group 2112, V-phase group 2111 and W-phase group 2211 in the order of U / V / W to correspond to the U-phase, V-phase and W-phase of the traction motor 400, the wiring layout between the phase groups in the first power module 210 and the second power module 220 can be simplified, thereby facilitating the maintenance of the first power module 210 and the second power module 220.

[0098] refer to Figure 3 In some embodiments, a plurality of mutually isolated chambers 300 include a first power chamber 310 and a second power chamber 320, the first power chamber 310 and the second power chamber 320 being disposed opposite to each other along a first direction, the first power module 210 being located in the first power chamber 310 and the second power module 220 being located in the second power chamber 320.

[0099] refer to Figure 3In this embodiment, the traction inverter housing 100 is rectangular in plan view. The housing 100 contains a first power chamber 310 and a second power chamber 320 that are separated from each other. The first power module 210 is located within the first power chamber 310, and the second power module 220 is located within the second power chamber 320. The first power chamber 310 and the second power chamber 320 are arranged opposite each other along a first direction, where the first direction is... Figure 3 In the vertical direction, the first power chamber 310 and the second power chamber 320 are symmetrically arranged on the upper and lower sides of the housing 100, and are also located close to the right side of the housing 100. Arranging the first power chamber 310 and the second power chamber 320 on the sides of the housing 100 makes it easier for the first power module 210 and the second power module 220 to dissipate heat through the upper and lower sides of the housing 100.

[0100] refer to Figure 2 and Figure 3 In some embodiments, the traction inverter may further include a braking chopper group 500, which is located in the second power chamber 320. The braking chopper group 500 is used to control the connection and disconnection between the traction motor 400 and the braking resistor 600. The braking chopper group 500 includes a first braking chopper 510 and a second braking chopper 520 connected in parallel.

[0101] In practical implementation, the braking chopper assembly 500 also generates a large amount of heat during operation, requiring heat dissipation. Therefore, placing the braking chopper assembly 500 within the first power chamber 310 or the second power chamber 320 helps improve its heat dissipation efficiency. Since the first power chamber 310 already contains the U-phase group 2112 and the V-phase group 2111, and the second power module 220 contains the W-phase group 2211, to balance the heat dissipation efficiency between the first and second power chambers 310 and prevent the first power chamber 310 from having lower heat dissipation efficiency due to the larger number of components, the braking chopper assembly 500 is placed within the second power chamber 320, thus improving the balance of heat dissipation efficiency between the two power chambers.

[0102] refer to Figure 2It should be noted that, as explained above regarding the first power component 211, setting only one braking chopper would also result in overload. Therefore, two parallel braking choppers are required to dissipate the three-phase AC power generated by the traction motor 400 during braking. These two braking choppers are connected in parallel to the main circuit, with a third terminal connected to the braking resistor 600 located outside the traction inverter. During braking, the AC power generated by the traction motor 400 is rectified into DC power by the power unit 200. The first voltage sensor 362 in the main circuit monitors the voltage of the rectified DC power. When the first voltage sensor 362 detects that the rectified DC power reaches a certain threshold, the braking chopper group 500 is turned on, connecting the rectified DC power to the braking resistor 600. The braking resistor 600 dissipates the current generated by the traction motor 400 as heat.

[0103] Continue to refer to Figure 2 In a specific implementation, an anti-reverse group 750 is also connected to the left side of the braking chopper group 500 in the main circuit. This anti-reverse group 750 can prevent the AC power generated by the traction motor 400 from flowing into the negative terminal of the main circuit after being rectified by the power unit 200, thereby preventing damage to the traction inverter. Specifically, the anti-reverse group 750 can be two anti-reverse diodes.

[0104] refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, the traction inverter further includes a first heat sink 110 and a second heat sink 120; the first heat sink 110 is connected to one side of the first power chamber 310 and communicates with the first power chamber 310 to dissipate the heat generated when the first power module 210 is working through the first heat sink 110; the second heat sink 120 is connected to one side of the second power chamber 320 and communicates with the second power chamber 320 to dissipate the heat generated when the second power module 220 is working through the second heat sink 120.

[0105] refer to Figure 3 In this embodiment, the first heat sink 110 is located outside the first power chamber 310, that is... Figure 3 The mesh structure at the bottom of the traction inverter, opposite to the first heat sink 110, is the second heat sink 120 located on the outdoor side of the second power installation room. Figure 3 The mesh structure on the upper part of the traction inverter. When the traction inverter of this application is installed at the bottom of the train, it generates a reverse airflow opposite to the direction of travel when the train is running. The direction of this reverse airflow is as follows: Figure 3As indicated by the direction of the middle arrow, the airflow flows from left to right. The heat generated by the first power module 210 is discharged from the housing 100 through the first heat sink 110, and the reverse airflow accelerates the heat dissipation. Similarly, the heat generated by the second power module 220 is dissipated through the second heat sink 120, and the reverse airflow further accelerates the heat dissipation.

[0106] refer to Figure 1 and Figure 4 In some embodiments, the first heat sink 110 and the second heat sink 120 are both detachably connected to the outer side wall of the housing 100. The first heat sink 110 extends along a second direction, and the second heat sink 120 extends in the same direction as the first heat sink 110. The second direction is perpendicular to the first direction.

[0107] In a specific implementation, both the first heat sink 110 and the second heat sink 120 are detachably connected to the outer side wall of the housing 100, thereby improving the connection flexibility between the first heat sink 110 and the second heat sink 120 and the housing 100, and enabling the components inside the heat sink to be maintained by disassembling the first heat sink 110 and the second heat sink 120.

[0108] refer to Figure 3 and Figure 6 In this embodiment, a first heat dissipation component 130 and a second heat dissipation component 140 are also included. The first heat dissipation component 130 is located inside the first heat dissipation cover 110, and part of the first heat dissipation component 130 is located inside the first power chamber 310 and connected to the first power module 210 to dissipate heat from the first power module 210. The second heat dissipation component 140 is located inside the second heat dissipation cover 120, and part of the second heat dissipation component 140 is located inside the second power chamber 320 and connected to the second power module 220 to dissipate heat from the second power module 220.

[0109] In specific implementation, to improve the heat dissipation efficiency of the first power chamber 310 and the second power chamber 320, a first heat dissipation component 130 is provided inside the first heat dissipation cover 110, and a second heat dissipation component 140 is provided inside the second heat dissipation cover 120. A portion of the first heat dissipation component 130 is located inside the first power chamber 310 and connected to the first power module 210, thereby allowing the heat generated by the first power module 210 to be discharged from the housing 100 through the first heat dissipation component 130 and the first heat dissipation cover 110. A portion of the second heat dissipation component 140 is located inside the second power chamber 320 and connected to the second power module 220, thereby allowing the heat generated by the second power module 220 to be discharged from the housing 100 through the second heat dissipation component 140 and the second heat dissipation cover 120.

[0110] refer to Figure 3 and Figure 6In some embodiments, the first heat dissipation assembly 130 includes a first substrate 131 and a first heat dissipation element 132 connected to the first substrate 131. The first heat dissipation element 132 is located inside the first heat dissipation cover 110, the first substrate 131 is located inside the first power chamber 310, and the first power module 210 is disposed on the first substrate 131. The second heat dissipation assembly 140 includes a second substrate 141 and a second heat dissipation element 142 connected to the second substrate 141. The second heat dissipation element 142 is located inside the second heat dissipation cover 120, the second substrate 141 is located inside the second power chamber 320, and the second power module 220 is disposed on the second substrate 141.

[0111] In a specific implementation, the first heat dissipation assembly 130 includes a first substrate 131 and a first heat sink 132. The first substrate 131 is fixedly connected to the side wall of the housing 100 where the first heat sink 110 is located. One side of the first substrate 131 is detachably connected to the first power module 210, and the other side is detachably connected to the first heat sink 132. The heat generated by the first power module 210 during operation is transferred to the first heat sink 132 through the first substrate 131 and discharged from the housing 100 through the first heat sink 132.

[0112] Similarly, the second heat dissipation assembly 140 includes a second substrate 141 and a second heat sink 142. The second substrate 141 is fixedly connected to the side wall of the housing 100 where the second heat sink 120 is located. One side of the second substrate 141 facing the housing 100 is detachably connected to the second power module 220, and the other side is detachably connected to the second heat sink 142. The heat generated by the second power module 220 during operation is transferred to the second heat sink 142 through the second substrate 141 and discharged from the housing 100 through the second heat sink 142.

[0113] In a specific implementation, the first heat sink 132 can be a first heat pipe radiator, which is detachably connected to the first substrate 131. The heat generated by the first power module 210 during operation is absorbed by the first heat pipe radiator and then discharged from the housing 100 through it. Similarly, the second heat sink 142 can be a second heat pipe radiator, which is detachably connected to the second substrate 141. The heat generated by the second power module 220 during operation is absorbed by the second heat pipe radiator and then discharged from the housing 100 through it. It should be noted that the first and second heat pipe radiators can have the same structure.

[0114] refer to Figures 1 to 5In some embodiments, a filter assembly 700 is also included. A plurality of mutually isolated chambers 300 include a ventilation duct chamber 330 and a filter chamber 340 communicating with the ventilation duct chamber 330. The ventilation duct chamber 330 extends along a second direction, and both ends of the extension direction of the ventilation duct chamber 330 are connected to the outside. A portion of the filter assembly 700 is located within the filter chamber 340, and the filter chamber 340 is located within the ventilation duct chamber 330.

[0115] refer to Figure 2 The traction inverter in this embodiment also includes a filter component 700. Since there are numerous harmonic sources in the power grid, such as rectifiers, converters, and frequency converters, the high-order harmonics they generate can seriously endanger the safe operation of the main transformer and other electrical equipment in the system. Therefore, before the DC power from the power grid is input to the power unit 200 of the traction inverter, the DC power is first input to the filter component 700 to absorb harmonic currents of specific frequencies in the DC power, thereby improving the safety of train operation.

[0116] In some embodiments, compared with the related art method of placing the filter component 700 outside the traction inverter housing 100, the present application embodiment places the filter component 700 inside the housing 100, which can improve the space utilization rate inside the traction inverter housing 100, and placing the filter component 700 inside the housing 100 instead of directly placing it at the bottom of the train can improve the usable space at the bottom of the train.

[0117] Further, refer to Figure 3 The filter assembly 700 is positioned between the two power modules, near the left side of the housing 100. To facilitate heat dissipation of the filter assembly 700, a ventilation duct chamber 330 is provided between the two power chambers. The ventilation duct chamber 330 extends along a second direction, with both ends of its extension direction connected to the outside of the housing 100. When the train is running and generates reverse airflow, the reverse airflow enters from the left port of the ventilation duct chamber 330 and exits from the right port. To facilitate heat dissipation of the filter assembly 700, it is positioned within the ventilation duct chamber 330 near the left port. Partially housing the filter assembly 700 within the filter chamber 340, which is connected to the ventilation duct chamber 330, allows for a more rational layout within the housing 100 and facilitates heat dissipation of the filter assembly 700.

[0118] refer to Figure 1 and Figure 4In some embodiments, ventilation hoods are provided at both the left and right ports of the ventilation duct chamber 330. The mesh of the first ventilation hood 333 at the left port is relatively small, which can prevent large debris from entering the ventilation duct chamber 330 through the ports on both sides, causing the filter reactor 710 or the fan 720 to malfunction, thereby improving the operational safety of the traction inverter. The mesh of the second ventilation hood 334 at the right port is relatively large, which is conducive to the heat dissipation of the traction inverter through the right port, thereby improving the heat dissipation efficiency of the ventilation duct chamber 330.

[0119] Furthermore, when it is necessary to inspect and maintain the filter reactor 710 or the fan 720 in the filter chamber 340, the first ventilation hood 333 located on the side of the housing 100 can be directly removed to inspect and maintain the filter reactor 710 or the fan 720. Compared with the method of repairing the filter reactor 710 from the bottom of the traction inverter housing 100 in related technologies, repairing the filter reactor 710 or the fan 720 from the side improves the efficiency of the inspection and maintenance of the filter reactor 710.

[0120] refer to Figures 1 to 5 In some embodiments, the filter assembly 700 includes a filter reactor 710 and a fan 720. The fan 720 is located near one end of the ventilation duct chamber 330 in the extending direction. The filter reactor 710 is connected to the U-phase group 2112, V-phase group 2111 and W-phase group 2211 in the first power assembly 211. The filter reactor 710 is used to filter the DC power and deliver the filtered DC power to the U-phase group 2112, V-phase group 2111 and W-phase group 2211. The fan 720 is used to discharge the heat generated by the filter reactor 710 to the housing 100 through the ventilation duct chamber 330.

[0121] refer to Figure 3 and Figure 5 In some embodiments, the ventilation duct chamber 330 is located between the first power chamber 310 and the second power chamber 320; the first power chamber 310 and the ventilation duct chamber 330 are connected through an openable first inspection door 331; the second power chamber 320 and the ventilation duct chamber 330 are connected through an openable second inspection door 332.

[0122] refer to Figure 3 In this embodiment, the filter assembly 700 may include a filter reactor 710 and a fan 720. The fan 720 is located on the far left side of the filter chamber 340, closer to the left port of the ventilation duct chamber 330 than the filter reactor 710. The filter reactor 710 is located on the right side of the filter chamber 340. The fan 720 can provide forced air cooling to the filter reactor 710, thereby improving the heat dissipation efficiency of the filter reactor 710.

[0123] refer to Figure 2 The filter reactor 710 is located at the input end of the main circuit and before the power unit 200. This means that the DC power input from the grid to the traction inverter must first be filtered by the filter reactor 710 before being simultaneously input to the first power component 211 and the second power component 221. Specifically, the DC power processed by the filter reactor 710 is input to the U-phase group 2112, the V-phase group 2111, and the W-phase group 2211, respectively, to convert the processed DC power into the AC power required by the traction motor 400.

[0124] refer to Figure 2 and Figure 3 Based on the above embodiments, the filter assembly 700 may further include a filter capacitor and a second voltage sensor 363. The DC power from the power grid first passes through the filter reactor 710, then enters the filter capacitor connected in series with the filter reactor 710, and finally enters the power unit 200. The second voltage sensor 363 is used to monitor the voltage value of the filter capacitor.

[0125] In some embodiments, the filter capacitor may include a first filter capacitor 730 and a second filter capacitor 740. The DC power processed by the filter reactor 710 is then transmitted to the corresponding first power module 210 and second power module 220 via the first filter capacitor 730 and the second filter capacitor 740, where the first power module 210 and the second power module 220 jointly convert the DC power into the three-phase AC power required by the traction motor 400. By connecting the filter reactor 710 to the first filter capacitor 730 and the second filter capacitor 740, the DC power from the power grid is tuned to a preset resonant frequency to absorb harmonic currents of the corresponding frequency in the power grid. This not only effectively absorbs power grid harmonics but also improves the safety factor of the train operation.

[0126] refer to Figures 1 to 5Based on the above embodiment, the ventilation duct chamber 330 and the first power chamber 310 are connected by a first inspection door 331. The first power module can be inspected and maintained through the first inspection door, improving the convenience of maintenance. When the first power module 210 malfunctions or requires maintenance, personnel can inspect and maintain it within the first power chamber 310 through the first inspection door 331 inside the ventilation duct chamber 330. Specifically, when maintenance of the first power module 210 is required, personnel must first open the second ventilation hood 334 located at the right-side port of the ventilation duct chamber 330 to enter the ventilation duct chamber 330, and then open the first inspection door 331 located on the side wall of the ventilation duct chamber 330 to perform inspection or maintenance of the first power module 210. Similarly, when the second power module 220 needs to be inspected or maintained, the second ventilation hood 334 is opened first, and then the second inspection door 332 is opened to carry out the corresponding inspection or maintenance on the second power module 220 in the second power chamber 320.

[0127] refer to Figure 2 In some embodiments, the traction inverter further includes a contactor assembly 170 for controlling the on and off of the main circuit. The contactor assembly 170 includes a pre-charge contactor 171 and a line contactor 172 connected in parallel.

[0128] In some embodiments, by Figure 2 It is understood that the contactor assembly 170 and the filter assembly 700 work together. Specifically, the DC power from the grid should first flow into the contactor assembly 170, and then into the filter assembly 700. When the traction inverter needs to be connected to the grid, the line contactor 172 is in the off state, only the pre-charging contactor 171 is turned on, and the first filter capacitor 730 and the second filter capacitor 740 in the filter assembly 700 are slowly charged. When the second voltage sensor 363 detects that the charging amount of the two filter capacitors has reached the preset value, the line contactor 172 is turned on and the pre-charging contactor 171 is turned off, and the DC power processed by the filter assembly 700 is input into the corresponding power module through the two filter capacitors.

[0129] refer to Figure 2 and Figure 3In a specific implementation, the traction inverter housing 100 also includes a high-voltage chamber 360 located to the left of the first power chamber 310. The aforementioned first voltage sensor 362, second voltage sensor 363, and contactor assembly 170 can all be housed within the high-voltage chamber 360. A high-voltage input area 150 is provided on the side wall of the housing 100 to the left of the high-voltage chamber 360. DC power from the grid enters the traction inverter housing 100 through this high-voltage input area 150 and conducts through the contactor assembly 170 and the first voltage sensor 362, sequentially energizing the filter assembly 700, power unit 200, etc. A high-voltage output area 160 is also provided on the right side wall of the enclosure 100. Specifically, the three-phase AC power converted by the first power module 210 and the second power module 220 will be delivered to each traction motor 400 through the high-voltage output area 160. The first voltage sensor 362, which is preferentially connected to the DC power of the grid, and the contactor assembly 170 are located in the high-voltage chamber 360 near the high-voltage input area 150. This improves the rationality of the modular layout inside the enclosure 100 and simplifies the wiring layout inside the enclosure 100.

[0130] Furthermore, the contactor assembly 170 may also include an electromagnetic contactor (not shown) for controlling the start and stop of the fan 720 in the filter assembly 700. The electromagnetic contactor is located within the first power module 210, which facilitates the dissipation of heat generated by the electromagnetic contactor outside the housing 100 via the first heat dissipation assembly 130 during operation, thereby improving the heat dissipation efficiency of the electromagnetic contactor.

[0131] refer to Figure 3 In some embodiments, the housing 100 of the traction inverter may further include a control unit. The input of the control unit is connected to a control system signal outside the traction inverter, and the output of the control unit is at least connected to the first power module 210 and the second power module 220. By receiving control signals from the control system, the first power module 210 and the second power module 220 can be controlled to be turned on or off. For example, the U-phase group 2112, the V-phase group 2111, and the W-phase group 2211 within the first power module 210 and the second power module 220 can be controlled to be turned on sequentially to generate the three-phase AC power required by the traction motor 400.

[0132] In a specific implementation, the enclosure 100 of the traction inverter may further include a low-voltage chamber 350, located to the left of the second power chamber 320, which houses the control unit. A low-voltage input / output area 180, communicating with the low-voltage chamber 350, is provided on the outer wall of the enclosure 100 to the left of the low-voltage chamber 350. This low-voltage input / output area 180 connects the external control system to the control unit within the low-voltage chamber 350, enabling the control unit to control the on / off states of the first power module 210 and the second power module 220.

[0133] refer to Figures 1 to 4 In practical implementation, a third maintenance door 351 and a fourth maintenance door 361 are also provided on the outer wall of the traction inverter housing 100. The third maintenance door 351 is located on the same side as the first heat sink 110 and is connected to the high-voltage chamber 360 through the third maintenance door 351. When it is necessary to inspect and maintain the contactor assembly 170, the first voltage sensor 362 or the second voltage sensor 363 in the high-voltage chamber 360, it can be inspected and maintained directly through the third maintenance door 351, thereby improving the inspection and maintenance efficiency of the traction inverter.

[0134] Furthermore, the fourth inspection door 361 is located on the same side as the second heat sink 120 and is connected to the low-voltage chamber 350 through the fourth inspection door 361. When it is necessary to inspect and maintain the control unit in the low-voltage chamber 350, it can be inspected and maintained directly through the fourth inspection door 361, thereby further improving the inspection and maintenance efficiency of the traction inverter.

[0135] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between embodiments can be referred to each other.

[0136] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0137] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0138] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0139] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A traction inverter, characterized in that, The device includes a housing and a power unit. The housing has multiple isolated chambers. The power unit includes a first power module and a second power module, which are located in different chambers. The first power module includes at least two interconnected first power components, and the second power module includes at least two interconnected second power components, with each first power component connected to each second power component, and the first power components and the second power components used to jointly drive at least four traction motors; The first power component includes a V-phase group and a U-phase group connected in parallel. The V-phase group has at least two interconnected V-phase components, and the U-phase group has at least two interconnected U-phase components. The second power component includes a W-phase group, wherein the W-phase group has at least two interconnected W-phase elements; The V-phase component is used to connect with the V-phase of the traction motor corresponding to the V-phase component; The U-phase component is used to connect with the U-phase of the traction motor corresponding to the U-phase component; The W-phase component is used to connect with the W-phase of the traction motor corresponding to the W-phase component.

2. The traction inverter according to claim 1, characterized in that, The plurality of mutually isolated chambers include a first power chamber and a second power chamber, the first power chamber and the second power chamber are arranged opposite to each other along a first direction, the first power module is located in the first power chamber and the second power module is located in the second power chamber.

3. The traction inverter according to claim 2, characterized in that, It also includes a braking chopper assembly located in the second power chamber, which is used to control the connection and disconnection between the traction motor and the braking resistor; The braking chopper assembly includes a first braking chopper and a second braking chopper connected in parallel.

4. The traction inverter according to claim 3, characterized in that, It also includes a first heat sink and a second heat sink; The first heat sink is connected to one side of the first power chamber and communicates with the first power chamber so as to dissipate the heat generated by the first power module during operation through the first heat sink. The second heat sink is connected to one side of the second power chamber and communicates with the second power chamber so as to dissipate the heat generated by the second power module during operation through the second heat sink.

5. The traction inverter according to claim 4, characterized in that, Both the first heat sink and the second heat sink are detachably connected to the outer side wall of the housing. The first heat sink extends along a second direction, and the second heat sink extends in the same direction as the first heat sink. The second direction is perpendicular to the first direction.

6. The traction inverter according to claim 5, characterized in that, It also includes a first heat dissipation component and a second heat dissipation component; The first heat dissipation component is located inside the first heat dissipation shroud, and part of the first heat dissipation component is located inside the first power cavity and connected to the first power module to dissipate heat from the first power module; The second heat dissipation component is located inside the second heat dissipation shroud. The second heat dissipation component is partially located inside the second power cavity and connected to the second power module to dissipate heat from the second power module.

7. The traction inverter according to claim 6, characterized in that, The first heat dissipation component includes a first substrate and a first heat dissipation element connected to the first substrate. The first heat dissipation element is located inside the first heat dissipation shroud, the first substrate is located inside the first power cavity, and the first power module is disposed on the first substrate. The second heat dissipation component includes a second substrate and a second heat dissipation element connected to the second substrate. The second heat dissipation element is located inside the second heat dissipation shroud, the second substrate is located inside the second power cavity, and the second power module is disposed on the second substrate.

8. The traction inverter according to any one of claims 5 to 7, characterized in that, It also includes a filtering component, wherein the plurality of mutually isolated chambers include a ventilation duct chamber and a filtering chamber communicating with the ventilation duct chamber, the ventilation duct chamber extending along the second direction, and both ends of the extending direction of the ventilation duct chamber communicating with the outside; A portion of the filter assembly is located within the filter chamber, which is located within the ventilation duct chamber.

9. The traction inverter according to claim 8, characterized in that, The filtering component includes a filter reactor and a fan. The fan is located near one end of the ventilation duct chamber in the extension direction. The filter reactor is connected to the U-phase group, the V-phase group, and the W-phase group. The filter reactor is used to filter the direct current and deliver the filtered direct current to the U-phase group, the V-phase group, and the W-phase group. The fan is used to discharge the heat generated by the filter reactor into the housing through the ventilation duct chamber.

10. The traction inverter according to claim 9, characterized in that, The ventilation duct chamber is located between the first power chamber and the second power chamber; The first power chamber is connected to the ventilation duct chamber via an openable first inspection door; The second power chamber is connected to the ventilation duct chamber via an openable second inspection door.

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