An AC energy-consuming valve power module for flexible low-frequency power transmission system

Abstract

The present invention relates to an AC energy-consuming valve power module for a flexible low-frequency power transmission system, comprising a thyristor crimping assembly, a resistor-capacitor absorption unit, and a high-voltage trigger plate unit; the thyristor crimping assembly is connected to the resistor-capacitor absorption unit; the thyristor crimping assembly is a double crimping assembly structure composed of a positive thyristor crimping assembly and a negative thyristor crimping assembly, and the positive thyristors in the positive thyristor crimping assembly and the negative thyristors in the negative thyristor crimping assembly form multiple groups of anti-parallel structures through conductive bars. The advantages are: the present invention applies crimped thyristors to power modules, adopts double thyristor crimping assemblies to form anti-parallel structures through conductive bars, and crimps multiple thyristors in each group of thyristor crimping assemblies, thereby realizing a compact arrangement of power devices and improving the power density of the AC energy-consuming valve.

Description

Technical Field

[0001] The invention belongs to the field of flexible low-frequency power transmission systems, and in particular relates to an AC energy-consuming valve power module used in flexible low-frequency power transmission systems. Background Art

[0002] With the help of power electronics technology, flexible low-frequency AC transmission can flexibly select a suitable frequency in the range of 0 to 50 Hz. The frequency is lower than the power frequency, the line impedance is small, the line voltage drop and charging power are small, and the cable current carrying capacity is high, which can significantly improve the transmission capacity. At the same time, it has the advantages of current zero-crossing breaking and easy networking. In addition, new energy power generation equipment can directly output low-frequency power without adding frequency conversion stations. Flexible low-frequency AC transmission technology allows new energy power generation equipment to directly output low-frequency power, realizing wide-area networking and long-distance power transmission. In the flexible low-frequency transmission system, after the AC system fails in the receiving system, the power of the sending system cannot be sent during the fault, which will cause the DC line voltage to increase, and the insulation level of the equipment of the entire system will be severely tested. As an important equipment of the flexible low-frequency transmission system, the AC energy-consuming valve power module will consume the energy that the receiving system cannot bear at this time to protect the reliable operation of the entire flexible low-frequency transmission system. Summary of the invention

[0003] The purpose of the present invention is to provide an AC energy-consuming valve power module for a flexible low-frequency power transmission system, apply a crimped thyristor to the power module, improve the compactness of the power module, improve the power density of the AC energy-consuming valve, and facilitate maintenance.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] An AC energy-consuming valve power module for a flexible low-frequency power transmission system comprises a thyristor crimping assembly, a resistor-capacitor absorption unit, and a high-potential trigger plate unit; the thyristor crimping assembly is connected to the resistor-capacitor absorption unit;

[0006] The thyristor crimping assembly is a double crimping assembly structure consisting of a positive thyristor crimping assembly and a negative thyristor crimping assembly. The positive thyristors in the positive thyristor crimping assembly and the negative thyristors in the negative thyristor crimping assembly form multiple groups of anti-parallel structures through conductive bars.

[0007] Furthermore, the positive thyristor crimping assembly and the negative thyristor crimping assembly both include a frame structure, a crimped unidirectional thyristor, a heat sink, a top bolt, and a disc spring; the crimped unidirectional thyristor and the heat sink are crimped into the frame structure by applying a pressing force through the disc spring and the top bolt;

[0008] Furthermore, the frame structure includes a crimping assembly top plate, a crimping assembly bottom plate, and a crimping assembly side plate; a heat sink is provided on both sides of each crimped unidirectional thyristor, the crimping assembly bottom plate is arranged between two heat sinks at the middle position of the positive thyristor crimping assembly or the negative thyristor crimping assembly, and the outsides of the heat sinks arranged at both ends of the positive thyristor crimping assembly or the negative thyristor crimping assembly are respectively crimped to the crimping assembly top plate through disc springs, the top bolt is connected to the crimping assembly top plate, and the end of the top bolt rests on the disc spring; the crimping assembly side plate is fixedly connected to the crimping assembly top plate, the crimping assembly bottom plate, and the heat sink.

[0009] Furthermore, the radiator is a self-cooling radiator, and the material of the radiator is Al6060-T6.

[0010] Furthermore, the positive thyristor crimping assembly and the negative thyristor crimping assembly are respectively arranged on the left and right sides of the power module.

[0011] Furthermore, the RC absorption unit includes multiple groups of RC absorption modules, which are connected in parallel with the anti-parallel structure through wires. The RC absorption modules are composed of a dynamic voltage equalizing resistor group and a dynamic voltage equalizing capacitor. The dynamic voltage equalizing resistor group and the dynamic voltage equalizing capacitor are connected in series; the dynamic voltage equalizing resistor group is composed of two dynamic voltage equalizing resistors connected in parallel.

[0012] Furthermore, the RC absorption unit and the high potential trigger board unit are both arranged outside the power module.

[0013] Furthermore, the high potential trigger plate unit includes a trigger plate unit frame and a trigger plate assembly, and a plurality of trigger plate assemblies are slidably connected to the trigger plate unit frame.

[0014] Furthermore, insulating beams are fixedly connected to both sides of the trigger plate assembly, and the trigger plate unit frame includes insulating columns and slide grooves. The insulating columns are provided with a plurality of slide grooves, and the insulating beams can slide horizontally in the slide grooves.

[0015] Furthermore, the high potential trigger plate unit, the RC absorption unit, and the thyristor crimping assembly are installed in the support frame from front to back.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention applies crimped thyristors to power modules, adopts double thyristor crimping assemblies to form an anti-parallel structure through conductive bars, and crimps multiple thyristors in each thyristor crimping assembly, thereby realizing a compact arrangement of power devices and improving the power density of the AC energy-consuming valve.

[0018] 2. The thyristor crimping assembly of the present invention is an easy-to-maintain structure. The positive thyristor crimping assembly and the negative thyristor crimping assembly are respectively arranged on the left and right sides of the power module. There is no need to disassemble the thyristor crimping assembly and then replace the thyristor. The thyristor can be quickly replaced on the AC energy-consuming valve power module, thereby improving the maintenance efficiency of the thyristor.

[0019] 3. The RC absorption unit of the present invention adopts an easy-to-maintain structure. The RC absorption unit is arranged on the rear and outer side of the power module, which can realize the rapid replacement of the dynamic balancing resistor and the dynamic balancing capacitor, thereby improving the maintenance efficiency of the dynamic balancing resistor and the dynamic balancing capacitor.

[0020] 4. The high-potential trigger board unit of the present invention adopts an easy-to-maintain structure. The high-potential trigger board unit is arranged on the front outside of the power module, and the trigger board assembly adopts a pull-out structure to achieve rapid replacement of the trigger board assembly, thereby improving the maintenance efficiency of the high-potential trigger board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an AC energy-consuming valve power module used in a flexible low-frequency power transmission system.

[0022] Figure 2 It is a schematic diagram of the structure of a thyristor crimping assembly.

[0023] Figure 3 It is a structural diagram of the RC absorption unit.

[0024] Figure 4 It is a structural schematic diagram of a high potential trigger board unit.

[0025] In the figure: 1-resistance-capacitance absorption unit, 2-thyristor crimping assembly, 3-high potential trigger plate unit, 4-support frame, 5-positive thyristor crimping assembly, 6-negative thyristor crimping assembly, 7-conductive bar, 8-top bolt, 9-crimping assembly top plate, 10-heat sink, 11-crimped unidirectional thyristor, 12-crimping assembly bottom plate, 13-guide sleeve, 14-disc spring, 15-crimping assembly side plate, 16-resistance heat sink, 17-dynamic equalizing resistor, 18-dynamic equalizing capacitor, 19-trigger plate unit frame, 20-trigger plate assembly, 21-insulating column, 22-insulating beam. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0027] Embodiment 1

[0028] This embodiment provides an AC energy-consuming valve power module for a flexible low-frequency power transmission system, such as Figure 1As shown, the power module includes a thyristor crimping assembly 2, a resistor-capacitor absorption unit 1, and a high-potential trigger board unit 3 which are installed in a support frame 4 from front to back.

[0029] like Figure 2 As shown, the thyristor crimping assembly 2 is a double crimping assembly structure, which is divided into a positive thyristor crimping assembly 5 and a negative thyristor crimping assembly 6 according to the position of the power device in the electrical topology of the power module. The positive thyristors in the positive thyristor crimping assembly 5 and the negative thyristors in the negative thyristor crimping assembly 6 form multiple groups of anti-parallel structures through the conductive bar 7.

[0030] The positive thyristor crimping assembly 5 and the negative thyristor crimping assembly 6 have the same structure, both including a frame structure, a crimped unidirectional thyristor 11, a heat sink 10, a top bolt 8, and a disc spring 14; the crimped unidirectional thyristor 11 and the heat sink 10 are crimped into the frame structure by applying a clamping force through the disc spring 14 and the top bolt 8.

[0031] Specifically, the frame structure includes a crimping assembly top plate 9, a crimping assembly bottom plate 12, and a crimping assembly side plate 15; the thyristor group is composed of a plurality of crimped unidirectional thyristors 11 and a heat sink 10, and a heat sink 10 is provided on both sides of each crimped unidirectional thyristor 11. The crimping assembly bottom plate 12 is arranged between the thyristor groups. The guide sleeve 13, the disc spring 14, and the crimping assembly top plate 9 are crimped on the outside of the thyristor group in sequence, the disc spring 4 is installed between the top plate 9 and the guide sleeve 13, the top bolt 8 is installed on the guide sleeve 13, and the bottom end of the top bolt 8 rests on the disc spring 14, which can apply a clamping force to the thyristor group. The crimping assembly side plate 15 is fixedly connected to the crimping assembly top plate 9, the crimping assembly bottom plate 12, and the heat sink 10.

[0032] like Figure 2 As shown, the thyristor crimping assembly 2 is an easy-to-maintain structure, and the positive thyristor crimping assembly 5 and the negative thyristor crimping assembly 6 are respectively installed on the left and right outer sides of the power module, which makes it convenient to disassemble the positive thyristor crimping assembly 5 and the negative thyristor crimping assembly 6 as a whole, and to directly disassemble and assemble the thyristors on the supporting frame 4 (the top bolt 8 can be directly removed outside the supporting frame 4 to replace the crimped unidirectional thyristor 11), thereby realizing rapid replacement of the thyristors.

[0033] The heat sink 10 of the thyristor crimping assembly 2 is a self-cooling heat sink 10, and the material is Al6060-T6 aluminum. The crimping assembly side plate 15 is made of EPGC202 insulation board.

[0034] Embodiment 2

[0035] This embodiment provides an AC energy-consuming valve power module for a flexible low-frequency power transmission system. The difference between this embodiment and the first embodiment is that the RC absorption unit 1 in this embodiment is:

[0036] like Figure 3 As shown, the RC absorption unit 1 includes multiple groups of RC absorption modules, which are connected in parallel with the anti-parallel structure through wires. The RC absorption module consists of a group of dynamic voltage-equalizing resistors 17 and a dynamic voltage-equalizing capacitor 18. The dynamic voltage-equalizing resistor 17 group is connected in series with the dynamic voltage-equalizing capacitor 18. The dynamic voltage-equalizing resistor 17 group consists of two dynamic voltage-equalizing resistors 17 connected in parallel. Each dynamic voltage-equalizing resistor 17 is connected to a resistor heat sink 16, which dissipates heat for the dynamic voltage-equalizing resistor 17.

[0037] The RC absorption unit 1 is an easy-to-maintain structure. The RC absorption unit 1 is arranged on the outside of the rear of the power module, which is convenient for disassembling and assembling the dynamic equalizing resistor 17 and the dynamic equalizing capacitor 18 from the rear side of the support frame 4, thereby realizing rapid replacement of the dynamic equalizing resistor 17 and the dynamic equalizing capacitor 18.

[0038] Embodiment 3

[0039] This embodiment provides an AC energy-consuming valve power module for a flexible low-frequency power transmission system. The difference between this embodiment and the first and second embodiments is that the high-potential trigger board unit 3 in this embodiment is:

[0040] like Figure 4 As shown, the high potential trigger plate unit 3 includes a trigger plate unit frame 19 and a trigger plate assembly 20. A plurality of trigger plate assemblies 20 are slidably connected to the trigger plate unit frame 19. Such a sliding connection adopts an insulated sliding structure. The trigger plate assembly 20 is connected in series with the RC absorption unit 1 through a wire and then connected in parallel to both ends of the electrode surface of the crimped unidirectional thyristor 11 through a wire.

[0041] The trigger plate assembly 20 is fixedly connected with insulating cross beams 22 on both sides, and the insulating cross beams 22 are used as inner slideways. The trigger plate unit frame 19 includes an insulating column 21 and a slideway. The insulating column 21 is provided with a plurality of slideways, and the slideway is a groove structure, with the slideway as an outer slideway. The insulating cross beam 22 can slide horizontally in the slideway to realize the pulling of the trigger plate assembly 20 from the trigger plate unit frame 19. The trigger plate assembly 20 can be quickly replaced.

[0042] The present invention adopts a double thyristor crimping assembly 2 with multiple thyristors crimped in an anti-parallel structure, realizes a compact arrangement of the power module, and improves the power density of the AC energy consumption valve. By designing the thyristor crimping assembly 2, the RC absorption unit 1, and the high-potential trigger board unit 3 for easy maintenance, the maintenance efficiency of the thyristor, the dynamic grading resistor 17, the dynamic grading capacitor 18, and the high-potential trigger board is improved.

[0043] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, any combination of the structures in the described embodiments is within the scope of protection of the present application.

Claims

1. An AC energy-consuming valve power module for a flexible low-frequency power transmission system, characterized in that: It includes a thyristor crimping assembly, a resistor-capacitor absorption unit, and a high-potential trigger plate unit; the thyristor crimping assembly is connected to the resistor-capacitor absorption unit; The thyristor crimping assembly is a double crimping assembly structure consisting of a positive thyristor crimping assembly and a negative thyristor crimping assembly. The positive thyristors in the positive thyristor crimping assembly and the negative thyristors in the negative thyristor crimping assembly form multiple groups of anti-parallel structures through conductive bars.

2. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The positive thyristor crimping assembly and the negative thyristor crimping assembly both include a frame structure, a crimped unidirectional thyristor, a heat sink, a top bolt, and a disc spring; the crimped unidirectional thyristor and the heat sink are crimped into the frame structure by applying a pressing force through the disc spring and the top bolt.

3. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 2, characterized in that: The frame structure includes a crimping assembly top plate, a crimping assembly bottom plate, and a crimping assembly side plate; a heat sink is provided on both sides of each crimped unidirectional thyristor, the crimping assembly bottom plate is arranged between two heat sinks at the middle position of the positive thyristor crimping assembly or the negative thyristor crimping assembly, the outsides of the heat sinks arranged at both ends of the positive thyristor crimping assembly or the negative thyristor crimping assembly are respectively crimped to the crimping assembly top plate through disc springs, the top bolt is connected to the crimping assembly top plate, and the end of the top bolt rests on the disc spring; the crimping assembly side plate is fixedly connected to the crimping assembly top plate, the crimping assembly bottom plate, and the heat sink.

4. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 2, characterized in that: The radiator is a self-cooling radiator, and the material of the radiator is Al6060-T6.

5. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The positive thyristor crimping assembly and the negative thyristor crimping assembly are respectively arranged on the left and right sides of the power module.

6. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The RC absorption unit includes multiple groups of RC absorption modules, which are connected in parallel with the anti-parallel structure through wires. The RC absorption module consists of a dynamic voltage-equalizing resistor group and a dynamic voltage-equalizing capacitor. The dynamic voltage-equalizing resistor group and the dynamic voltage-equalizing capacitor are connected in series; the dynamic voltage-equalizing resistor group consists of two dynamic voltage-equalizing resistors connected in parallel.

7. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The RC absorption unit and the high potential trigger plate unit are both arranged outside the power module.

8. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The high potential trigger plate unit comprises a trigger plate unit frame and a trigger plate assembly, and a plurality of trigger plate assemblies are slidably connected to the trigger plate unit frame.

9. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 8, characterized in that: Insulating beams are fixedly connected to both sides of the trigger plate assembly. The trigger plate unit frame includes insulating columns and slide grooves. The insulating columns are provided with a plurality of slide grooves, and the insulating beams can slide horizontally in the slide grooves.

10. The AC energy-consuming valve power module for a flexible low-frequency power transmission system according to claim 1, characterized in that: The high potential trigger plate unit, the RC absorption unit and the thyristor crimping assembly are installed in the support frame from front to back.

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