CN118159003A - High-pressure air-cooled valve tower based on thyristor - Google Patents

Abstract

The invention relates to a high-pressure air-cooled valve tower based on thyristors, which comprises a plurality of thyristor rectifying assemblies connected in series, wherein each thyristor rectifying assembly respectively comprises an insulating base, the insulating base is provided with a valve assembly, two ends of the valve assembly are extended to be connected with copper bars, an air cooling system is arranged on one side of the valve assembly, the air cooling system comprises a fan capable of supplying cooling air for the thyristor rectifying assemblies, and the fan is powered by low pressure; the air outlet cover of the fan is provided with a fan cover, and the valve component is arranged close to the air outlet of the fan cover; the insulating base is located the valve assembly and is kept away from the fan housing one side and sets up damping circuit, damping circuit electricity connection valve assembly. The invention solves the problems of high maintenance cost and complex structure of the existing water-cooled valve tower; according to the invention, an air cooling system is arranged in each thyristor rectifying component, and the cooling cold air is output by the fan, so that the purpose of cooling the component is achieved.

Description

Thyristor based high voltage air-cooled valve tower

Technical Field

The invention relates to the technical field of electrical equipment, and in particular to a thyristor-based high-voltage air-cooled valve tower.

Background technique

The thyristor converter valve tower is composed of several valve modules connected in series in sequence. The existing converter valve tower includes a plurality of valve modules and a plurality of reactor modules arranged in parallel at intervals along the longitudinal direction of the insulating support frame. Adjacent valve modules are connected in series through a conductive plate, and the conductive plate is located in the center between the valve modules. A water cooling system for cooling the valve modules is arranged between adjacent valve modules. The water cooling system includes a cooling water main pipeline and a cooling water pipeline. The gap between adjacent valve modules constitutes a maintenance gap. Since the water cooling system is arranged between adjacent valve modules, water leakage is a key factor affecting the safe operation of the converter valve. When the water cooling system on the upper part of the converter valve tower leaks, it will cause damage to the lower valve module and the reactor module, reducing the service life of the thyristor converter valve tower. In addition, due to the limitation of the maintenance gap space, the shape of the water cooling system pipeline is not suitable for production, the processing is difficult, and the cost is increased.

Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a thyristor-based high-voltage air-cooled valve tower to overcome the defects of the prior art.

Summary of the invention

The purpose of the present invention is to provide a thyristor-based high-voltage air-cooled valve tower, which solves the problems of high maintenance cost and complex structure of existing water-cooled valve towers; in the present invention, each thyristor rectifier assembly has a built-in air cooling system, and the fan outputs heat dissipation cold air to achieve the purpose of component heat dissipation.

The object of the present invention is achieved in this way. A thyristor-based high-voltage air-cooled valve tower includes a plurality of thyristor rectifier assemblies connected in series, each of the thyristor rectifier assemblies includes an insulating base, a valve assembly is provided on the insulating base, connecting copper bars extend from both ends of the valve assembly, the insulating base is located on one side of the valve assembly, an air cooling system is provided, the air cooling system includes a fan that can supply heat dissipating cold air to the thyristor rectifier assembly, and the fan is powered by low voltage; an air outlet cover of the fan is provided with a wind hood, and the valve assembly is arranged near the air outlet of the wind hood; the insulating base is located on the side of the valve assembly away from the wind hood to provide a damping circuit, and the damping circuit is electrically connected to the valve assembly.

In a preferred embodiment of the present invention, each of the wind hoods is gradually expanded from the fan to the valve assembly, the air inlet of each of the wind hoods is a contraction end, and the air outlet of each of the wind hoods is an opening end, a plurality of the fans are arranged at each of the contraction ends, an air duct is extended from each of the opening ends, each of the valve assemblies is respectively located in each of the air ducts, and each of the connecting copper bars is arranged to extend out of the air duct.

In a preferred embodiment of the present invention, a fan connecting pipe is provided between the air outlet of the fan and the air inlet of the air cover.

In a preferred embodiment of the present invention, the air duct is arranged in a rectangular shape.

In a preferred embodiment of the present invention, the air duct is constructed with insulating material.

In a preferred embodiment of the present invention, the air ducts of the thyristor rectifier assemblies are arranged in parallel.

In a preferred embodiment of the present invention, the valve assembly includes a silicon stack, the silicon stack includes a plurality of thyristors connected in series side by side, a heat sink is provided on both sides of each thyristor, a pressure plate is provided for every equal number of thyristors in the silicon stack, a clamping device is provided at the end of the silicon stack, and the connecting copper bus is located at both ends of the silicon stack; each thyristor is electrically connected to a voltage equalizing resistor and an energy extraction resistor, respectively, each voltage equalizing resistor is arranged in series, and the voltage equalizing resistor and the energy extraction resistor are both arranged on the top of the heat sink.

In a preferred embodiment of the present invention, the plurality of thyristors of the silicon stack are arranged in two sections, and the two sections are conductively connected by a connecting copper bus and an intermediate nickel-plated pressure plate.

In a preferred embodiment of the present invention, each of the thyristors is matched with a first TCU unit, and each of the thyristors is electrically connected to the voltage balancing resistor and the energy extraction resistor through the first TCU unit.

In a preferred embodiment of the present invention, the damping circuit includes a damping resistor unit and a damping capacitor unit, and the damping resistor unit and the damping capacitor unit are electrically connected;

The damping resistor unit comprises a resistor support plate arranged on the surface of the insulating base, and the resistor support plate is provided with a damping resistor by connecting copper studs;

The damping capacitor unit comprises a damping capacitor, which is arranged in the insulating base through an electrical bracket and is located directly below the resistor support plate; each of the thyristors is respectively connected in series with the damping resistor and the damping capacitor.

In a preferred embodiment of the present invention, a plurality of the thyristor rectifier assemblies are evenly arranged vertically, and the thyristor rectifier assemblies are connected via an insulating support frame.

In a preferred embodiment of the present invention, the insulating base includes four U-shaped insulating connecting plates that are enclosed and connected, and a connecting hole structure for connecting to the insulating support frame is provided on the insulating base.

As described above, the thyristor high-voltage air-cooled valve tower of the present invention has the following beneficial effects:

The thyristor-based high-voltage air-cooled valve tower of the present invention solves the problems of high maintenance cost and complex structure of the existing water-cooled valve tower; each thyristor rectifier assembly has a built-in air cooling system, which outputs heat dissipation cold air to the thyristor, damping circuit, etc. through a fan and a wind hood to avoid component overheating;

The present invention can meet the requirements of rapid disassembly and assembly on site;

The present invention adopts a forced air cooling design, the fan is powered by low voltage, and is spatially isolated from the high voltage system in which the thyristor high voltage air-cooled valve tower is located, meeting the insulation clearance and creepage distance requirements to ensure overall operation safety.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

FIG1 is a schematic structural diagram of a thyristor rectifier assembly of the present invention located on one side of a wind turbine.

FIG. 2 is a schematic diagram of a valve assembly of the present invention.

FIG. 3 is a bottom view of the thyristor rectifier assembly of the present invention.

FIG. 4 is a schematic diagram of a thyristor rectifier assembly of the present invention located on one side of a damping resistor.

In the figure:

1. Insulating base; 2. Valve assembly; 3. Connecting copper busbar; 4. Fan; 5. Wind hood; 6. Thyristor; 7. Pressure plate; 8. Clamping device; 9. Radiator; 10. Voltage-equalizing resistor; 11. Energy-taking resistor; 12. Resistor support plate; 13. Connecting copper stud; 14. Damping resistor; 15. Damping capacitor; 16. Fan connecting pipe; 17. Air duct; 18. First TCU unit.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

The specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

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

As shown in Figures 1 to 4, the present invention provides a thyristor-based high-voltage air-cooled valve tower, including a plurality of thyristor rectifier assemblies connected in series (applied to high-voltage systems, with a voltage of up to 35KV, prior art), each thyristor rectifier assembly includes an insulating base 1, a valve assembly 2 is provided on the insulating base 1, connecting copper bars 3 are extended at both ends of the valve assembly 2, the insulating base 1 is located on one side of the valve assembly 2 to set an air cooling system, the air cooling system includes a fan 4 that can supply heat dissipation cold air to the thyristor rectifier assembly, the fan 4 is powered by low voltage (220V); an air outlet cover of the fan 4 is provided with a hood 5, and the valve assembly 2 is arranged near the air outlet of the hood 5; the insulating base 1 is located on the side of the valve assembly 2 away from the hood 5 to set a damping circuit, the damping circuit is electrically connected to the valve assembly 2, and in this embodiment, the damping circuit is electrically connected to the valve assembly 2 via a second TCU unit.

The thyristor-based high-voltage air-cooled valve tower of the present invention solves the problems of high maintenance cost and complex structure of the existing water-cooled valve tower; each thyristor rectifier assembly has a built-in air cooling system, which outputs heat dissipation cold air to the thyristor, damping circuit, etc. through a fan and a wind hood to avoid component overheating;

The present invention can meet the requirements of rapid disassembly and assembly on site;

The present invention adopts a forced air cooling design, the fan is powered by low voltage, and is spatially isolated from the high voltage system where the thyristor high voltage air-cooled valve tower is located, meeting the insulation clearance and creepage distance requirements to ensure overall operation safety.

Furthermore, the plurality of thyristor rectifier assemblies are evenly arranged vertically, and the thyristor rectifier assemblies are connected via insulating support frames.

Further, as shown in Figures 1 and 4, the insulating base 1 includes four U-shaped insulating connecting plates that are connected to each other, and a connecting hole structure for connecting the insulating support frame is provided on the insulating base 1. The insulating base 1 is arranged in a rectangular shape, and the connecting hole structure is arranged at the four corners of the insulating base 1. Each component can be detachably connected to the insulating base 1, meeting the requirements of rapid disassembly and assembly on site.

The insulating base 1 is the foundation for assembling all parts and the support for building the valve tower. The total weight of a single component is about 400kg, and the base is required to meet the strength requirements of the valve tower construction and the installation space and insulation requirements of the parts. Based on the materials that can be produced at present, it is determined that the base body of the insulating base 1 adopts EPGC molded 240*80*8U profiles, and steel connecting angles are designed around to connect the U profiles into a whole. The connection is also equipped with φ22 holes for connecting the insulating pillars of the valve tower.

Further, as shown in Figures 2 and 4, the valve assembly 2 includes a silicon stack, which includes a plurality of thyristors 6 connected in series in parallel, a heat sink 9 is provided on both sides of each thyristor 6, a pressure plate 7 is provided for every equal number of thyristors 6 in the silicon stack, a clamping device 8 is provided at the end of the silicon stack, and the connecting copper bus 3 is located at both ends of the silicon stack; each thyristor 6 is electrically connected to a voltage equalizing resistor 10 and an energy extraction resistor 11, respectively, each voltage equalizing resistor 10 is arranged in series, and the voltage equalizing resistor 10 and the energy extraction resistor 11 are both arranged on the top of the heat sink 9.

Further, as shown in Figures 2 and 4, the silicon stack is composed of multiple components and matching heat sinks and crimping parts. Due to the large number of components and the small size of the table, it is easy to produce flexural deformation during crimping and the stability is poor. Therefore, the multiple thyristors 6 of the silicon stack are arranged in two sections, each section has five components, three front, middle and rear pressure plates 7, the two ends are clamped, and two sets of clamping devices are configured; the two sections are conductively connected by connecting copper bars and the middle nickel-plated pressure plate.

Furthermore, each thyristor 6 is matched with a first TCU unit 18 , and each thyristor 6 is electrically connected to the voltage balancing resistor 10 and the energy extraction resistor 11 through the first TCU unit.

Further, as shown in FIG. 3 and FIG. 4 , the damping circuit includes a damping resistor unit and a damping capacitor unit, and the damping resistor unit and the damping capacitor unit are electrically connected; in this embodiment, the damping resistor unit and the damping capacitor unit are circuit-connected via a high-voltage wire.

The damping resistor unit includes a resistor support plate 12 disposed on the surface of the insulating base 1, and the resistor support plate 12 is connected to a damping resistor 14 by connecting a copper stud 13;

The damping capacitor unit includes a damping capacitor 15 , which is arranged in the insulating base 1 through an electrical bracket and is located directly below the resistor support plate 12 ; each thyristor 6 is respectively connected in series with a damping resistor 14 and a damping capacitor 15 .

When the damping resistor 14 is working, the heat power is 300w, and the surface temperature is 375℃ under self-cooling conditions; therefore, the design of the damping resistor unit should fully consider the high-temperature working requirements of the components; such as: the long-term allowable working temperature of the insulating material (SMC) is less than 150℃, and the high temperature of the connecting wire is less than 130℃; in the design, the resistor connection adopts a copper busbar with nickel plating on the surface. The damping resistor 14 is fixed on the resistor support plate 12 by connecting the copper studs 13. A 50mm ventilation space is designed between the damping resistor 14 and the resistor support plate 12 to reduce the temperature at the connection between the copper studs 13 and the resistor support plate 12. A cable rack is set on the upper part of the resistor support plate 12 to fix the cable and avoid the influence of the high temperature of the resistor on the cable.

After the design scheme was determined, the corresponding heating experiment was carried out according to the design conditions to verify the actual temperature rise. The experimental results showed that under air cooling conditions, the maximum temperature (23°C environment) at the connection between the copper stud 13 and the resistor support plate 12 was 50.8°C, which met the material requirements and the thermal design was reasonable and safe. The experimental data is shown in Table 1.

Table 1 Temperature rise test record of the connection between copper stud 13 and resistor support plate 12

Further, as shown in FIG. 1 and FIG. 4 , each wind hood 5 is gradually expanded from the fan 4 to the valve assembly 2, the air inlet of each wind hood 5 is a contraction end, and the air outlet of each wind hood 5 is an opening end. In a specific embodiment of the present invention, the wind hood 5 is an isosceles trapezoid;

A plurality of fans 4 are arranged at each contraction end, an air duct 17 is extended at each opening end, each valve assembly 2 is located in each air duct 17 , and each connecting copper bus 3 is arranged to extend out of the air duct 17 .

Furthermore, as shown in FIG. 1 , a fan connecting pipe 16 is provided between the air outlet of the fan 4 and the air inlet of the air cover 5 .

In a specific embodiment of the present invention, the air duct 17 is arranged in a rectangular shape.

Furthermore, the air duct 17 is constructed with insulating materials, and the structure is stable and reliable.

Furthermore, the air ducts of the thyristor rectifier components are arranged in parallel. The wind speed and air duct inlet temperature of each radiator are basically the same, and the heat dissipation conditions are consistent, thus avoiding the problem of overheating of local components.

As shown in FIG. 1 , in a specific embodiment of the present invention, three fans 4 are arranged in each air duct 17 , and the temperature rise of the thyristor does not exceed 50K under the condition of a through-current of 60A.

As described above, the thyristor high-voltage air-cooled valve tower of the present invention has the following beneficial effects:

The thyristor-based high-voltage air-cooled valve tower of the present invention solves the problems of high maintenance cost and complex structure of the existing water-cooled valve tower; each thyristor rectifier assembly has a built-in air cooling system, which outputs heat dissipation cold air to the thyristor, damping circuit, etc. through a fan and a wind hood to avoid component overheating;

The present invention can meet the requirements of rapid disassembly and assembly on site;

The present invention adopts a forced air cooling design, the fan is powered by low voltage, and is spatially isolated from the high voltage system in which the thyristor high voltage air-cooled valve tower is located, meeting the insulation clearance and creepage distance requirements to ensure overall operation safety.

The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims (12)

1. A thyristor-based high-voltage air-cooled valve tower, characterized in that it comprises a plurality of thyristor rectifier assemblies connected in series, each of the thyristor rectifier assemblies comprises an insulating base, a valve assembly is arranged on the insulating base, connecting copper bars extend from both ends of the valve assembly, an air cooling system is arranged on one side of the valve assembly, the air cooling system comprises a fan capable of supplying heat-dissipating cold air to the thyristor rectifier assembly, the fan is powered by low voltage; an air outlet cover of the fan is provided with an air hood, the valve assembly is arranged near the air outlet of the air hood; a damping circuit is arranged on the insulating base on the side of the valve assembly away from the air hood, and the damping circuit is electrically connected to the valve assembly. 2. The thyristor-based high-pressure air-cooled valve tower according to claim 1 is characterized in that each of the wind hoods is gradually expanded from the fan to the valve assembly, the air inlet of each of the wind hoods is a contraction end, and the air outlet of each of the wind hoods is an opening end, a plurality of the fans are arranged at each of the contraction ends, an air duct extends from each of the opening ends, each of the valve assemblies is respectively located in each of the air ducts, and each of the connecting copper bars is arranged to extend out of the air duct. 3. The thyristor-based high-pressure air-cooled valve tower according to claim 2, characterized in that a fan connecting pipe is provided between the air outlet of the fan and the air inlet of the wind cover. 4. The thyristor-based high-voltage air-cooled valve tower according to claim 2, characterized in that the air duct is arranged in a rectangular shape. 5. The thyristor-based high-voltage air-cooled valve tower according to claim 2, characterized in that the air duct is constructed with insulating materials. 6. The thyristor-based high-voltage air-cooled valve tower according to claim 1 or 2, characterized in that the air ducts of the thyristor rectifier assemblies are arranged in parallel. 7. The thyristor-based high-pressure air-cooled valve tower according to claim 1 or 2 is characterized in that the valve assembly includes a silicon stack, the silicon stack includes a plurality of thyristors connected in series side by side, a heat sink is provided on both sides of each thyristor, a pressure plate is provided for every equal number of thyristors in the silicon stack, a clamping device is provided at the end of the silicon stack, and the connecting copper bus is located at both ends of the silicon stack; each thyristor is electrically connected to a voltage equalizing resistor and an energy extraction resistor, respectively, each voltage equalizing resistor is arranged in series, and the voltage equalizing resistor and the energy extraction resistor are both arranged on the top of the radiator. 8. The thyristor-based high-voltage air-cooled valve tower according to claim 7 is characterized in that the multiple thyristors of the silicon stack are arranged in two sections, and the two sections are conductively connected by connecting copper bars and an intermediate nickel-plated pressure plate. 9. The thyristor-based high-voltage air-cooled valve tower according to claim 7, characterized in that each of the thyristors is matched with a first TCU unit, and each of the thyristors is electrically connected to the voltage-equalizing resistor and the energy-taking resistor through the first TCU unit. 10. The thyristor-based high-voltage air-cooled valve tower according to claim 7, characterized in that: The damping circuit comprises a damping resistor unit and a damping capacitor unit, and the damping resistor unit and the damping capacitor unit are electrically connected; The damping resistor unit comprises a resistor support plate arranged on the surface of the insulating base, and the resistor support plate is provided with a damping resistor by connecting copper studs; The damping capacitor unit comprises a damping capacitor, which is arranged in the insulating base through an electrical bracket and is located directly below the resistor support plate; each of the thyristors is respectively connected in series with the damping resistor and the damping capacitor. 11. The thyristor-based high-voltage air-cooled valve tower according to claim 1 or 2, characterized in that a plurality of the thyristor rectifier assemblies are evenly arranged vertically, and the thyristor rectifier assemblies are connected by an insulating support frame. 12. The thyristor-based high-voltage air-cooled valve tower according to claim 11, characterized in that the insulating base comprises four enclosed and connected U-shaped insulating connecting plates, and a connecting hole structure for connecting the insulating support frame is provided on the insulating base.