Power unit structure of power electronic transformer

Abstract

The utility model discloses a power unit structure of a power electronic transformer, and belongs to the technical field of power electronic transformers. Comprising a frame, a high-voltage power module, a high-frequency transformer, a low-voltage power module, an air duct, a top fan and a bottom fan, the air duct is arranged in the middle area of the frame, the top fan is mounted at the top of the air duct, and the bottom fan is mounted at the bottom of the air duct; the high-voltage power modules are installed in the frame and located on one side of the air duct, and first air outlets of the high-voltage power modules are connected with third air inlets of the air duct. The plurality of high-frequency transformers are mounted in the air duct; the low-voltage power modules are installed in the frame and located on the other side of the air duct. By comprehensively considering the characteristics of internal components of the power electronic transformer, the power module which is not easy to damage and needs heat dissipation is placed in the air duct, heat dissipation is accelerated, and stable operation of the power electronic transformer is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic transformers, in particular to a power unit structure of a power electronic transformer. Background Art

[0002] As a key component of modern power systems, the design of power electronic transformers is crucial to improving system stability and power quality. In the rapid development of smart grids and new AC / DC distribution networks, power electronic transformers play a core role.

[0003] At present, there are two typical structural layouts of power electronic transformer power units widely used in the market. One is a structure in which high-voltage power modules, high-frequency transformers and low-voltage power modules are distributed at different levels, in which two power cabinets share an air duct, but the power modules and transformers are located outside the air duct. Although this design saves space, the leakage inductance of the circuit is increased due to the long connecting cables or copper bars. At the same time, the space under the fan cannot be used as an air duct, resulting in a decrease in power density. The other design adopts an integrated layout of high-voltage power modules, high-frequency transformers and low-voltage power modules on the same layer, and all modules are placed in the air duct. Although this design is conducive to heat dissipation, since all key components are concentrated on one level, it makes it more difficult to maintain high-voltage and low-voltage power modules. In addition, when all modules are installed on the same base, it may also affect the heat dissipation effect of the power modules on the lower layer.

[0004] Due to the voltage rating limit of power electronic devices, when power electronic transformers are used in high voltage environments, multiple low voltage modules are often cascaded. Each module in this cascade structure contains a high voltage power module, a high frequency transformer and a low voltage power module. In actual operation, these modules and transformers will generate a lot of heat. If the heat dissipation is poor, it will directly affect the operating stability of the power electronic transformer. At the same time, power electronic devices operating under complex working conditions may also be damaged. Utility Model Content

[0005] Aiming at the problem that the power module in the prior art will emit a lot of heat, which affects the operation stability of the power electronic transformer due to poor heat dissipation, the utility model provides a power unit structure of a power electronic transformer. By comprehensively considering the characteristics of the internal components of the power electronic transformer, the power module that is not easy to be damaged and needs heat dissipation is placed in the air duct, so as to accelerate the heat dissipation and ensure the stable operation of the power electronic transformer.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0007] A power unit structure of a power electronic transformer comprises a frame, a high-voltage power module, a high-frequency transformer, a low-voltage power module, an air duct, a top fan and a bottom fan; the air duct is arranged in the middle area of ​​the frame, the top fan is installed at the top of the air duct, and the bottom fan is installed at the bottom of the air duct; a plurality of the high-voltage power modules are installed in the frame, located on one side of the air duct, and a first air outlet of the high-voltage power module is connected to a third air inlet of the air duct; a plurality of the high-frequency transformers are installed inside the air duct; a plurality of the low-voltage power modules are installed in the frame, located on the other side of the air duct, and a second air outlet of the low-voltage power module is connected to a fourth air inlet of the air duct.

[0008] Optionally, a resonant capacitor is also included; the resonant capacitor is installed above the high-frequency transformer.

[0009] Optionally, the high-voltage power module is connected to a high-frequency transformer.

[0010] Optionally, the low-voltage power module is connected to a high-frequency transformer.

[0011] Optionally, the air duct includes a high-pressure side baffle, a low-pressure side baffle, a top plate, a bottom plate, a first side baffle and a second side baffle; the top plate is installed in the middle area of ​​the top of the frame; the bottom plate is installed in the middle area of ​​the bottom of the frame; the high-pressure side baffle, the low-pressure side baffle, the first side baffle and the second side baffle are arranged between the top plate and the bottom plate; the high-pressure side baffle and the low-pressure side baffle are arranged opposite to each other, and the first side baffle and the second side baffle are arranged opposite to each other.

[0012] Optionally, the high-pressure side baffle, the low-pressure side baffle, the top plate, the bottom plate, the first side baffle and the second side baffle are fixed on the frame.

[0013] Optionally, the third air inlet is arranged on the high-pressure side baffle.

[0014] Optionally, the fourth air inlet is arranged on the low-pressure side baffle.

[0015] Optionally, the top plate is provided with a top air outlet, and the top fan is installed in the top air outlet.

[0016] Optionally, the bottom plate is provided with a bottom air inlet, and the bottom fan is installed in the bottom air inlet.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model discloses a power electronic transformer power unit structure, and its unique layout method not only simplifies the wiring process, but also greatly enhances the scalability of the system. In order to meet the needs of different application scenarios, the utility model allows the same-layer high-voltage power modules, high-frequency transformers and low-voltage power modules to be placed in M ​​rows and N columns in the horizontal direction and the vertical direction, respectively. This modular design not only improves the flexibility of the system, but also ensures the maximization of power density. In order to ensure the stable operation and efficient heat dissipation of internal components, the power electronic transformer power unit uses insulating plates or metal plates around the top, bottom and middle of the frame to construct a closed air duct. This air duct design not only ensures the smoothness of the air flow, but also effectively prevents the invasion of external dust and impurities. The high-voltage side baffle and the low-voltage side baffle of the air duct are both provided with air inlets that match the size and position of the air outlets of the high-voltage power module and the low-voltage power module, which improves the heat dissipation effect of the power electronic transformer and ensures the stable operation of the power electronic transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of a power unit structure of a power electronic transformer of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the air duct of a power unit structure of a power electronic transformer of the utility model;

[0022] Figure 3 The utility model is a schematic diagram of the external structure of the air duct of the power unit structure of the power electronic transformer.

[0023] In the figure, 1 is a frame; 2 is a high-voltage power module; 21 is a first air outlet; 211 is a first air inlet; 3 is a high-frequency transformer; 4 is a low-voltage power module; 41 is a second air outlet; 411 is a second air inlet; 5 is an air duct; 51 is a high-voltage side baffle; 511 is a third air inlet; 52 is a low-voltage side baffle; 521 is a fourth air inlet; 53 is a top plate; 531 is a top air outlet; 54 is a bottom plate; 541 is a bottom air inlet; 55 is a first side plate; 6 is a top fan; 7 is a bottom fan; and 8 is a resonant capacitor. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] Glossary:

[0028] Power module: It is a modular solution that integrates multiple power semiconductor devices (such as IGBT, MOSFET, diode, etc.) and drive circuits, and is widely used in high-power electronic products.

[0029] High-frequency transformer: a transformer specially used in high-frequency circuits, which can transfer high-frequency electrical energy from one circuit to another and adapt to the needs of different circuits by transforming parameters such as voltage, current, and impedance.

[0030] Power electronic transformer: a new type of transformer based on power electronic technology, which uses semiconductor devices to control the direction and size of current, thereby changing the conversion ratio between input and output voltages and achieving precise control of voltage and current.

[0031] Aiming at the problem that the power module in the prior art will emit a lot of heat, and the poor heat dissipation will affect the operation stability of the power electronic transformer, the utility model provides a power unit structure of a power electronic transformer, including a frame 1, a high-voltage power module 2, a high-frequency transformer 3, a low-voltage power module 4, an air duct 5, a top fan 6, a bottom fan 7 and a resonant capacitor 8.

[0032] like Figure 1 As shown, the frame 1 is provided with a duct 5, a high-voltage power module 2 and a low-voltage power module 4 in the middle, the high-voltage power module 2 is installed on one side of the duct 5 in the frame 1, and the low-voltage power module 4 is installed on the other side of the duct 5 in the frame 1. A high-frequency transformer 3 and a resonant capacitor 8 are arranged in the duct 5, the resonant capacitor 8 is located above the high-frequency transformer 3, and a top fan 6 is arranged above the duct 5.

[0033] like Figure 2 As shown, the air duct 5 includes a high-pressure side baffle 51, a low-pressure side baffle 52, a top plate 53, a bottom plate 54, a first side baffle 55 and a second side baffle.

[0034] The high-pressure side baffle 51, the low-pressure side baffle 52, the first side baffle 55 and the second side baffle are arranged between the top plate 53 and the bottom plate 54, wherein the high-pressure side baffle 51 and the low-pressure side baffle 52 are arranged opposite to each other, and the first side baffle 55 and the second side baffle are arranged opposite to each other. The high-pressure side baffle 51, the low-pressure side baffle 52, the top plate 53, the bottom plate 54, the first side baffle 55 and the second side baffle are fixed on the frame 1.

[0035] The number of high-voltage power modules 2 and the number of low-voltage power modules 4 are equal.

[0036] like Figure 3 As shown, there are several high-voltage power modules 2, high-frequency transformers 3 and low-voltage power modules 4, and the frame 1 is divided into 3 columns and several layers. The high-voltage power modules 2 and low-voltage power modules 4 are located in the first column and the third column, and the middle column is the air duct 5. The high-frequency transformer 3 is installed in the middle column air duct 5, and the number of high-voltage power modules 2 and low-voltage power modules 4 in each layer is equal, and the resonant capacitor 8 is fixed on the high-frequency transformer 3. The high-voltage power modules 2, high-frequency transformers 3 and low-voltage power modules 4 in the same layer can be placed in M ​​rows and N columns in the horizontal direction and the vertical direction respectively as needed, and the M×N high-frequency transformers are all located in the air duct 5, and the M×N high-voltage power modules 2 and low-voltage power modules 4 are all located outside the air duct 5.

[0037] The high-voltage power module 2 is provided with a first air outlet 21 and a first air inlet 211, which are arranged at relative positions, the first air outlet 21 is located at one end of the high-voltage power module 2 facing the air duct 5, and the first air inlet 211 is located at one end of the high-voltage power module 2 facing the outside of the frame 1. The third air inlet 511 is arranged on the high-voltage side baffle 51 of the air duct 5, and the first air outlet 21 and the third air inlet 511 of the high-voltage power module 2 are installed.

[0038] The low-voltage power module 4 is provided with a second air outlet 41 and a second air inlet 411, which are arranged at relative positions, the second air outlet 41 is located at one end of the low-voltage power module 4 facing the air duct 5, and the second air inlet 411 is located at one end of the low-voltage power module 4 facing the outside of the frame 1. A fourth air inlet 521 is arranged on the low-voltage side baffle 52 of the air duct 5, and the second air outlet 41 and the fourth air inlet 521 of the low-voltage power module 4 are installed.

[0039] The top plate 53 of the air duct 5 is provided with a top air outlet 531, and the top fan 6 is installed in the top air outlet 531. The material of the top plate 53 is a steel plate. According to the working scene requirements, the top plate 53 can also be made of other materials. The top plate 53 is fixed to the frame 1 with screws and can be removed. According to the working scene requirements, the top plate 53 can also be fixed to the frame 1 by other means.

[0040] The number of top air outlets 531 and the number of top fans 6 are consistent, and the number of top air outlets 531 and the number of top fans 6 are set according to working conditions.

[0041] The bottom plate 54 of the air duct 5 is provided with a bottom air inlet 541, and the bottom fan 7 is installed in the bottom air inlet 541. The material of the bottom plate 54 is a steel plate. According to the requirements of the working scene, the bottom plate 54 can also be made of other materials. The bottom plate 54 is fixed to the frame 1 with screws and can be removed. According to the working conditions, the bottom plate 54 can also be fixed to the frame 1 by other means.

[0042] The number of bottom air inlets 541 and bottom fans 7 is consistent, and the number of bottom air inlets 541 and bottom fans 7 are set according to working conditions.

[0043] The high-pressure side baffle plate 51 is fixed to the frame 1 by screws and cannot be removed. According to working conditions, the high-pressure side baffle plate 51 can also be fixed to the frame 1 by other means.

[0044] The first side plate 51, the second side plate and the low-pressure side baffle plate 52 are fixed to the frame 1 with screws and can be removed. According to working conditions, the first side plate 51, the second side plate and the low-pressure side baffle plate 52 can also be fixed to the frame 1 in other ways.

[0045] There are sealing rings or sealing strips between the high-pressure side baffle 51, the low-pressure side baffle 52, the top plate 53, the bottom plate 54, the first side baffle 55 and the second side baffle.

[0046] The high-pressure power module 2, the low-pressure power module 4, the top fan 6 and the bottom fan 7 arranged on the high-pressure side baffle 51, the low-pressure side baffle 52, the top plate 53 and the bottom plate 54 are provided with sealing rings or sealing strips between the high-pressure side baffle 51, the low-pressure side baffle 52, the top plate 53 and the bottom plate 54.

[0047] The high-voltage power module 2 and the high-frequency transformer 3 are connected by cables or copper bars; the high-frequency transformer 3 and the low-voltage power module 4 are connected by cables or copper bars. Depending on the working conditions, the high-voltage power module 2 and the high-frequency transformer 3, and the high-frequency transformer 3 and the low-voltage power module 4 can be connected in other ways.

[0048] When the power electronic transformer is running, the bottom fan 7 is a blowing fan, which blows room temperature air into the air duct 5 from the bottom, and the top fan 6 is an exhaust fan, which can suck the hot air in the air duct 5 and exhaust it. Under the action of the top fan 6 and the bottom fan 7, a negative pressure is formed in the air duct 5, so that each high-voltage power module 2 and low-voltage power module 4 can inhale room temperature air from the air inlet of the module. After passing through the heat sink in the power module, the room temperature air dissipates heat for the high-voltage power module 2 and the low-voltage power module 4. The room temperature air heated by the power module enters the air duct 5 and is extracted by the top fan 6.

[0049] When the power electronic transformer is maintained, if the high-voltage power module 2 or the low-voltage power module 4 needs maintenance, the fixing screws of the high-voltage power module 2 or the low-voltage power module 4 can be directly unscrewed, the connection cable between the high-voltage power module 2 or the low-voltage power module 4 and the high-frequency transformer 3 can be loosened, and the module to be repaired can be removed. If the high-frequency transformer 3 needs maintenance, the low-voltage power module 4 corresponding to the high-frequency transformer 3 and the low-voltage side baffle 52 of the corresponding air duct 5 can be removed, and then the high-frequency transformer 3 can be pulled out.

[0050] In summary, the utility model discloses a power electronic transformer power unit structure, wherein the frame 1, the high-voltage power module 2, the high-frequency transformer 3, the low-voltage power module 4 and the air duct 5 are composed, and the top fan 6 and the bottom fan 7 are supplemented to ensure good heat dissipation performance. Its unique layout makes the high-voltage power module 2, the high-frequency transformer 3 and the low-voltage power module 4 arranged in the order of front, middle and back, and the modules are efficiently connected by cables or copper bars. This design not only simplifies the wiring process, but also greatly enhances the scalability of the system. In order to meet the needs of different application scenarios, the utility model allows the same-layer high-voltage power module 2, the high-frequency transformer 3 and the low-voltage power module 4 to be placed in M ​​rows and N columns in the horizontal direction and the vertical direction, respectively. This modular design not only improves the flexibility of the system, but also ensures the maximization of power density. In order to ensure the stable operation and efficient heat dissipation of the internal components, the power electronic transformer power unit uses insulating plates or metal plates around the top, bottom and middle of the frame 1 to construct a closed air duct 5. This air duct 5 design not only ensures the smoothness of the wind flow, but also effectively prevents the invasion of external dust and impurities. The high-pressure side baffle 51 and the low-pressure side baffle 52 of the air duct 5 are provided with air inlets that match the size and position of the air outlets of the high-pressure power module 2 and the low-pressure power module 4. This precise design further improves the heat dissipation effect and ensures the stable operation of the entire system.

[0051] In general, the utility model has the characteristics of simple wiring, good scalability, convenient maintenance of power module and high power density. By comprehensively considering the characteristics of the internal components of the power electronic transformer, the high-frequency transformer that is not easy to be damaged and needs heat dissipation is placed in the air duct, and the high-voltage power module, high-frequency transformer and low-voltage power module are arranged on the same layer. The structure has simple wiring, good scalability, convenient maintenance of power module and high power density.

[0052] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.

[0053] The above content is a further detailed description of the utility model. It cannot be determined that the specific implementation methods of the utility model are limited to these. For ordinary technicians in the technical field to which the utility model belongs, they can make some simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the protection scope of the utility model determined by the submitted claims.

Claims

1. A power unit structure of a power electronic transformer, characterized in that: It comprises a frame (1), a high-voltage power module (2), a high-frequency transformer (3), a low-voltage power module (4), an air duct (5), a top fan (6) and a bottom fan (7); The air duct (5) is arranged in the middle area of ​​the frame (1), a top fan (6) is installed at the top of the air duct (5), and a bottom fan (7) is installed at the bottom of the air duct (5); A plurality of the high-voltage power modules (2) are installed in the frame (1) and are located on one side of the air duct (5); a first air outlet (21) of the high-voltage power module (2) is connected to a third air inlet (511) of the air duct (5); A plurality of high-frequency transformers (3) are installed inside the air duct (5); A plurality of the low-voltage power modules (4) are installed in the frame (1) and are located on the other side of the air duct (5); the second air outlet (41) of the low-voltage power module (4) is connected to the fourth air inlet (521) of the air duct (5).

2. The power unit structure of a power electronic transformer according to claim 1, characterized in that: Also includes a resonant capacitor (8); The resonant capacitor (8) is installed above the high-frequency transformer (3).

3. The power unit structure of a power electronic transformer according to claim 1, characterized in that: The high-voltage power module (2) is connected to a high-frequency transformer (3).

4. The power unit structure of a power electronic transformer according to claim 1, characterized in that: The low-voltage power module (4) is connected to the high-frequency transformer (3).

5. The power unit structure of a power electronic transformer according to claim 1, characterized in that: The air duct (5) comprises a high-pressure side baffle (51), a low-pressure side baffle (52), a top plate (53), a bottom plate (54), a first side baffle (55) and a second side baffle; The top plate (53) is installed in the middle area of ​​the top of the frame (1); The bottom plate (54) is installed in the middle area of ​​the bottom of the frame (1); The high-pressure side baffle (51), the low-pressure side baffle (52), the first side baffle (55) and the second side baffle are arranged between the top plate (53) and the bottom plate (54); The high-pressure side baffle (51) and the low-pressure side baffle (52) are arranged opposite to each other, and the first side baffle (55) and the second side baffle are arranged opposite to each other.

6. The power unit structure of a power electronic transformer according to claim 5, characterized in that: The high-pressure side baffle (51), the low-pressure side baffle (52), the top plate (53), the bottom plate (54), the first side baffle (55) and the second side baffle are fixed on the frame (1).

7. The power unit structure of a power electronic transformer according to claim 5, characterized in that: The third air inlet (511) is arranged on the high-pressure side baffle (51).

8. The power unit structure of a power electronic transformer according to claim 5, characterized in that: The fourth air inlet (521) is arranged on the low-pressure side baffle (52).

9. The power unit structure of a power electronic transformer according to claim 5, characterized in that: The top plate (53) is provided with a top air outlet (531), and the top fan (6) is installed in the top air outlet (531).

10. The power unit structure of a power electronic transformer according to claim 5, characterized in that: The bottom plate (54) is provided with a bottom air inlet (541), and the bottom fan (7) is installed in the bottom air inlet (541).

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