Converter power module

Abstract

The invention relates to the field of current conversion equipment, in particular to a converter power module. The converter power module comprises a box body, the box body comprises a front panel and a rear panel, and two sub-modules are arranged in the box body in a bilateral symmetry mode. Each sub-module comprises a vertical mounting plate connected between the front panel and the rear panel of the box body, a water-cooling radiator mounted at the front end of the mounting plate, an IGBT module mounted on one side, opposite to the mounting plate, of the water-cooling radiator, a thyristor mounted on the mounting plate, a resistor mounted on the other side of the water-cooling radiator and two layers of capacitors arranged on the outer side of the mounting plate; an SCE control panel is installed on the tops of the two installation plates and connected with the two sub-modules, and a bypass switch is arranged at the position, below the installation plates, of the front end of the box body and connected with the two sub-modules. According to the current converter power module, the power density of the current converter is improved under the condition that the loss of the current converter is not changed, the number of the current converter power modules is reduced by half, and the occupied area of the current converter is reduced.

Description

Technical Field

[0001] The present invention relates to the field of equipment for current conversion, and in particular to a converter power module. Background Art

[0002] With the development requirements of compact and efficient distribution networks in smart cities in the future, it is necessary to solve the problem of tight land occupation in urban distribution. At present, there are many converter power modules in the distribution network, which occupy a large area and cannot meet the development needs of compact and efficient distribution networks. Therefore, it is necessary to design a converter power module structure that can reduce the number of converter power modules in the distribution network while meeting the compact structure of the converter power module, ensure the high efficiency, high power density and high reliability of the converter power module, and also ensure that it has stable performance and excellent protection level so that it can operate stably. Summary of the invention

[0003] The object of the present invention is to provide a converter power module to solve the problem that the converter power modules in the existing power distribution network are large in number and occupy a large area.

[0004] To achieve the above objectives, the inverter power module of the present invention adopts the following technical solutions:

[0005] The inverter power module comprises a box body, the box body comprises a front panel and a rear panel, two submodules are symmetrically arranged in the box body, each submodule comprises a vertical mounting plate connected between the front and rear panels of the box body, a water-cooled radiator installed at the front end of the mounting plate, an IGBT module installed on the side of the water-cooled radiator facing away from the mounting plate, a thyristor installed on the mounting plate in parallel with the water-cooled radiator, a resistor installed on the other side of the water-cooled radiator, and two layers of capacitors arranged on the outer side of the mounting plate at the rear of the box body along the front-to-back direction; an SCE control board is installed on the top of the front end of the two mounting boards, the SCE control board is connected to the two submodules respectively, and a bypass switch is also arranged at the front end of the box body below the mounting board, and the bypass switch is connected to the two submodules respectively.

[0006] Furthermore, the two layers of capacitors are defined as upper capacitors and lower capacitors, a fixed bottom plate for fixing the lower capacitors is connected below the lower capacitors, and a fixed top plate for suspending the upper capacitors is connected above the upper capacitors.

[0007] Furthermore, two left-right symmetrical top frames are provided on both sides of the top of the box body, and the fixed top plate is fixedly mounted on the top frames.

[0008] Furthermore, a liquid inlet and a liquid outlet are provided at the front end of the water-cooled radiator, and openings corresponding to the liquid inlet and the liquid outlet are provided on the front panel.

[0009] Furthermore, an insulating support plate is installed between the mounting plate and the SCE control board, and the SCE control board is installed on the insulating support plate to separate the SCE control board from the submodule in space.

[0010] Furthermore, a SCE control board shielding box is also installed on the insulating support plate.

[0011] Furthermore, the two layers of the capacitors are connected via a laminated busbar, and the laminated busbar is provided with a break to ensure that the capacitors can be quickly disconnected from the electrical main circuit during testing.

[0012] Furthermore, a bypass switch driving module is arranged in the box body side by side with the bypass switch, and a shielding box is installed outside the bypass switch driving module.

[0013] Furthermore, a conductor is connected between the box and the capacitor to reduce the electrical clearance and creepage distance of the power module.

[0014] Furthermore, a handle is fixedly installed on the outer side of the front panel of the box.

[0015] Beneficial effects: The converter power module of the present invention is an improved invention. The converter power module of the present invention is provided with two submodules symmetrically in the box, and the two submodules include a mounting plate and a water-cooled radiator, an IGBT module, a thyristor, a resistor installed on the inner side of the water-cooled radiator, and two layers of capacitors arranged on the outer side of the mounting plate. The power density is improved while the power consumption of the converter remains unchanged, and the number of power modules is reduced by half. The SCE control board above the mounting plate in the box can accurately control the two submodules; the bypass switch below the mounting plate in the box can quickly bypass the submodule when a submodule fails to avoid further expansion of the fault. The converter power module of the present invention improves the power density of the converter while the converter loss remains unchanged, reduces the number of converter power modules by half, and reduces the floor space of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of an embodiment of a converter power module of the present invention;

[0017] Figure 2 It is a schematic diagram of the box structure of the converter power module of the present invention;

[0018] Figure 3 It is a schematic structural diagram of a laminated busbar of the converter power module of the present invention;

[0019] Figure 4 It is a schematic structural diagram of another laminated busbar of the converter power module of the present invention;

[0020] Figure 5 A schematic diagram of capacitor arrangement of a converter power module of the present invention;

[0021] Figure 6 The inverter power module of the present invention Figure 1 An internal component layout diagram of one embodiment;

[0022] Figure 7 The inverter power module of the present invention Figure 1 The internal component layout diagram of the other side of the embodiment;

[0023] Figure 8 The inverter power module of the present invention Figure 1 A schematic structural diagram of a water cooling radiator fixing plate of an embodiment;

[0024] Fig. 9 The inverter power module of the present invention Figure 1 Schematic diagram of the capacitor installation structure of the embodiment.

[0025] In the figure: 101, box body; 11, front panel; 12, rear panel; 13, bottom plate; 14, metal sealing plate; 15, main circuit copper busbar; 16, opening; 17, handle; 18, insulating top plate; 19, top frame; 201, mounting plate; 21, water cooling radiator; 22, thyristor; 23, IGBT module; 24, SCE control board; 25, high voltage power supply; 26, low voltage power supply; 27, insulating support plate; 28, SCE control board; 29, SCE control board shielding box; 301, bypass switch; 31, bypass switch drive module; 401, capacitor assembly; 41, upper capacitor assembly; 42, lower capacitor assembly; 43, laminated busbar; 44, fixed bottom plate; 45, fixed top plate; 46, connecting copper busbar; 47, copper busbar gasket. DETAILED DESCRIPTION

[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0027] Aiming at the problem that the existing power distribution network has a large number of converter power modules and occupies a large area, the present invention proposes a converter power module in a targeted manner. Two sub-modules are arranged in the box. The number of converter power modules can be halved while the power consumption of the converter remains unchanged, thereby improving the power density of the converter.

[0028] In a basic embodiment, Figure 1 , 8As shown, each power element of the converter power module is integrated in a box 101, and two sub-modules are arranged in the box 101. The two sub-modules are symmetrical, and the two sub-modules respectively include two mounting plates 201 installed between the front panel 11 and the rear panel 12 of the box 101, a water-cooled radiator 21 installed on one end of the mounting plate 201 close to the front panel 11 of the box 101, a thyristor 22 installed on the mounting plate 201 in parallel with the water-cooled radiator 21, an IGBT module 23 installed on the side of the water-cooled radiator 21 facing away from the mounting plate 201, a resistor installed on the other side of the water-cooled radiator 21, and two groups of capacitor components 401 installed on the outer sides of the two mounting plates 201 close to the rear panel 12 of the box 101. The water-cooled radiator 21 can cool the IGBT module 23 and the thyristor 22; the capacitor assembly 401 plays the role of energy storage and filtering for the converter power module. The two groups of capacitor assemblies 401 include an upper and lower layer. A laminated busbar 43 is installed between the upper capacitor assembly 41 and the lower capacitor assembly 42. A connecting copper busbar 46 is connected between the upper capacitor assembly 41 and the laminated busbar 43 to connect the capacitor assembly 401 to the main electrical circuit.

[0029] A bypass switch 301 is installed below the mounting plate 201 in the box 101. The bypass switch 301 is embedded on the front panel 11 of the box. The lower end of the bypass switch 301 is installed on the bottom plate 13 of the box. A bypass switch driving module 31 is installed on the side of the bypass switch 301 facing the inside of the box. The bypass switch 301 is connected to the two submodules respectively. When the converter submodule fails, it can be bypassed through the bypass switch 301 to avoid further expansion of the failure. An SCE control board 28 is installed above the front end of the mounting plate 201. The SCE control board 28 is connected to the two submodules respectively. The SCE control board 28 precisely controls the converter power module by receiving instructions from the upper control system. The side panels on the left and right sides of the box 101 are metal sealing plates 14, and the top is an insulating top plate 18. At the same time, all power components in the box are fully encapsulated. Even if the IGBT module 23 explodes, it will not affect other components. A high-voltage power supply 25 and a low-voltage power supply 26 are respectively installed on the two mounting plates 201 to power the submodules in the box 101. The submodule directly draws energy from the submodule capacitor. The voltage range of the submodule capacitor is wide and the fluctuation is large. Therefore, the energy-drawing power supply must meet the requirements of a wide input range, tolerance to frequent fluctuations in input voltage, and the input and output withstand voltage must match the voltage level of the power device (1700V). The maximum transient operating voltage of the submodule is 1350V, and the operating voltage range of the high-voltage power supply 25 meets the requirements of 200V to 1500V, which can ensure reliable operation when the rated DC voltage is above 0.5pu. The primary and secondary side withstand voltages of the power supply meet the requirements of 2.5kVrms and above, ensuring the reliable operation of the redundant power supply function. The total power required by the SCE control board 28AD sampling circuit (±15V), control chip (+5V) and IGBT driver (+15V) in the sub-module is about 20W. Considering the 70% working efficiency of the subsequent power supply, the minimum output power of the low-voltage power supply 26 is 29W. Considering the high temperature working condition of the sub-module, a certain margin is reserved for the low-voltage power supply 26.

[0030] In a preferred embodiment, Figure 5 As shown, a fixed bottom plate 44 is fixedly connected to the lower end of the lower capacitor assembly 42, and a fixed top plate 45 is fixedly connected to the upper end of the upper capacitor assembly 41. The fixed bottom plate 44 and the fixed top plate 45 can fix the capacitor assembly in the box 101 to make the structure of the capacitor assembly more stable.

[0031] In a preferred embodiment, Fig. 9 As shown, two top frames 19 are symmetrically installed on the top of the box 101, and the two ends of the two top frames 19 are installed on the front panel 11 and the rear panel 12 of the box 101. The fixed top plate 45 is installed on the top frame 19, which can fix the upper capacitor assembly 41, so that the structure of the capacitor assembly 401 in the box 101 is more stable.

[0032] In other embodiments, the fixed top plate 45 can be directly fixedly mounted on the inner wall of the metal sealing plate 14 of the box body 101 , and can also fix the upper capacitor assembly 41 .

[0033] In a preferred embodiment, Figure 2 As shown, an opening 16 is provided on the front panel 11 of the box body 101 to match the water-cooled radiator 21. The water-cooled radiator 21 can be connected to an external water channel through the opening 16. The water channel does not need to enter the box body 101 and will not occupy the space inside the box body 101, so that the space inside the box body 101 can be fully utilized.

[0034] In a preferred embodiment, an insulating support plate 27 is installed between the mounting plate 201 and the SCE control board 28, an SCE control board card 24 is installed on the insulating support plate 27, and the SCE control board 28 is installed on the SCE control board card 24. The insulating support plate 27 can separate the SCE control board 28 from the sub-module in space so that the primary side and the secondary side in the box do not interfere with each other.

[0035] In other embodiments, the SCE control board 28 can be directly installed in the box, and can also receive instructions from the upper control system to accurately control the inverter power module.

[0036] In a preferred embodiment, Figure 6 As shown, a SCE control board shielding box 29 is installed on the insulating support plate 27. The shielding box is made of metal or a material with electromagnetic shielding performance, which can effectively absorb and reflect electromagnetic waves and protect the SCE control board from external electromagnetic interference.

[0037] In other embodiments, there is no electromagnetic interference outside the converter power module, and the SCE control board shielding box may not be installed on the insulating support plate.

[0038] In a preferred embodiment, Figure 3 , 4 As shown, the laminated busbar 43 between the upper capacitor assembly 41 and the lower capacitor assembly 42 is divided into two layers, and a break is provided on the laminated busbar 43. The longer section of the busbar is connected to the capacitor assembly, and the shorter section of the busbar is connected to the main circuit copper busbar 15. The busbars at both ends are connected together by a copper busbar gasket 47. When testing the inverter power module, the capacitor assembly can be disconnected from the main circuit to prevent the capacitor assembly from discharging energy and shorten the test time.

[0039] In other embodiments, when there is no need to test the inverter power module, the laminated busbar 43 may be an integrated structure, and the capacitor assembly may also be connected to the main electrical circuit and fixed.

[0040] In a preferred embodiment, Figure 7 As shown, the bypass switch driving module 31 adopts an electromagnetic shielding design. A shielding box is provided on the outer cover of the bypass switch driving module 31. The shielding box is made of metal or a material with electromagnetic shielding performance, which can effectively absorb and reflect electromagnetic waves. The shielding box can prevent the bypass switch driving module 31 from being interfered by external high-frequency electromagnetic interference.

[0041] In other embodiments, there is no electromagnetic interference outside the converter power module, and a shielding box may not be provided outside the bypass switch driving module 31 .

[0042] In a preferred embodiment, a conductor is connected between the casing 101 and the capacitor assembly 401, which can reduce the electrical clearance and creepage distance of the converter power module, so that the voltage level between each power component in the module and the metal casing of the casing is half of the rated operating voltage of the power module.

[0043] In a preferred embodiment, a handle 17 is fixedly mounted on the front panel 11 of the box body 101 to facilitate installation and transportation of the inverter power module.

[0044] In other embodiments, the inverter power module may be directly carried, installed, and disassembled without installing a handle on the box 101 .

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An inverter power module, comprising a box, the box comprising a front panel and a rear panel, characterized in that: Two submodules are symmetrically arranged in the box, each submodule comprises a vertical mounting plate connected between the front and rear panels of the box, a water-cooled radiator installed at the front end of the mounting plate, an IGBT module installed on the side of the water-cooled radiator facing away from the mounting plate, a thyristor installed on the mounting plate in parallel with the water-cooled radiator, a resistor installed on the other side of the water-cooled radiator, and two layers of capacitors arranged on the outer side of the mounting plate at the rear of the box along the front-to-back direction; an SCE control board is installed on the top of the front end of the two mounting boards, the SCE control board is connected to the two submodules respectively, and a bypass switch is also arranged at the front end of the box below the mounting board, the bypass switch is connected to the two submodules respectively.

2. The converter power module according to claim 1, characterized in that: The two layers of capacitors are defined as upper capacitors and lower capacitors, wherein a fixed bottom plate for fixing the lower capacitors is connected below the lower capacitors, and a fixed top plate for suspending the upper capacitors is connected above the upper capacitors.

3. The converter power module according to claim 2, characterized in that: Two left-right symmetrical top frames are arranged on both sides of the top of the box body, and the fixed top plate is fixedly installed on the top frames.

4. The converter power module according to claim 1, characterized in that: A liquid inlet and a liquid outlet are arranged at the front end of the water-cooled radiator, and openings corresponding to the liquid inlet and the liquid outlet are arranged on the front panel.

5. The inverter power module according to claim 1, characterized in that: An insulating support plate is installed between the mounting plate and the SCE control board, and the SCE control board is installed on the insulating support plate to separate the SCE control board from the submodule in space.

6. The inverter power module according to claim 5, characterized in that: An SCE control board shielding box is also installed on the insulating support plate.

7. The converter power module according to any one of claims 1 to 6, characterized in that: The two layers of capacitors are connected via a laminated busbar, and a break is provided on the laminated busbar to ensure that the capacitors can be quickly disconnected from the electrical main circuit during testing.

8. The converter power module according to any one of claims 1 to 6, characterized in that: A bypass switch driving module is arranged in the box body side by side with the bypass switch, and a shielding box is installed outside the bypass switch driving module.

9. The converter power module according to any one of claims 1 to 6, characterized in that: A conductor is connected between the box and the capacitor to reduce the electrical clearance and creepage distance of the power module.

10. The converter power module according to any one of claims 1 to 6, characterized in that: A handle is fixedly installed on the outer side of the front panel of the box.

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