A compact self-cooled thyristor valve

Abstract

This invention provides a compact self-cooling thyristor valve, comprising a housing, a heat sink, and a thyristor valve body. The housing is a frame structure with openings at both ends, and the heat sink is installed at one of the opening ends of the housing. The thyristor valve body is placed in the inner cavity of the housing and is installed on the heat sink. This invention integrates the heat sink and the housing into one unit, greatly reducing the size of the device, resulting in low power consumption and convenient modular production.

Description

Technical Field

[0001] This invention relates to the field of thyristor valve technology, and more particularly to a compact self-cooling thyristor valve. Background Technology

[0002] my country's power distribution network construction is relatively backward. In many regions, the power grid suffers from problems such as low power factor, large voltage fluctuation, high voltage, and reactive power backflow. These problems not only fail to meet the relevant requirements of power quality standards and affect the normal electricity use of power users, but also pose serious hidden dangers to the power grid and affect its reliable and stable operation.

[0003] Static Var Compensators (SVCs) are the best method and approach to solve the aforementioned problems. SVCs were developed based on mechanically switched capacitors and reactors, replacing mechanical switches with large-capacity thyristors. They can rapidly change the reactive power they generate, possessing strong reactive power regulation capabilities. They can provide dynamic reactive power to the power system, compensating the system voltage to a reasonable level. By dynamically regulating reactive power, SVCs suppress bus voltage fluctuations caused by impulsive loads, facilitating transient voltage recovery and improving system voltage stability.

[0004] SVCs include thyristor controlled reactors (TCRs) and megnetic controlled reactors (MCRs). Among them, the thyristor valve is one of the core control devices of the MCR-type SVC, which can provide an effective way to achieve dynamic reactive power compensation in power systems, reduce voltage fluctuations, stabilize system voltage levels, and solve problems such as charging power and reactive power backfeed.

[0005] The design and selection of thyristor valves are relatively conservative, resulting in large and heavy components and a large footprint for the equipment. Currently, the most common heat dissipation method for thyristors is water cooling, which requires piping. However, for thyristor valves in MCR static var compensators with relatively small capacity, the heat generated is relatively low. Setting up water cooling pipes not only results in high power consumption and large size but also poses many potential safety hazards, making it uneconomical and impractical. Summary of the Invention

[0006] The purpose of this invention is to provide a compact self-cooling thyristor valve, which solves the shortcomings of existing thyristor valves, such as high power consumption, large size, many potential safety hazards, and lack of economy and practicality.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a compact self-cooling thyristor valve, comprising a housing, a radiator, and a thyristor valve body, wherein the housing is a frame structure with openings at both ends, and the radiator is installed at one opening end of the housing; the thyristor valve body is placed in the inner cavity of the housing and is installed on the radiator.

[0009] Preferably, the heat sink includes a substrate on which a plurality of heat dissipation teeth are evenly distributed.

[0010] Preferably, the thyristor valve body includes a thyristor module, a diode module, a fuse assembly, an RC snubber unit, and a trigger unit, wherein the thyristor module, diode module, fuse assembly, and RC snubber unit are all mounted on the substrate of the heat sink.

[0011] Preferably, the RC snubber unit is arranged at the top of the inner cavity of the housing, and a diode module, a thyristor module and a fuse assembly are arranged in parallel below the RC snubber unit; the triggering unit is arranged on the side of the diode module, the thyristor module and the fuse assembly.

[0012] Preferably, the terminals on the thyristor module and the diode module are fixed to the heat sink via low-voltage insulated terminals.

[0013] Preferably, the RC absorption unit includes three damping resistors connected in parallel, and one end of each damping resistor is connected in series with a damping capacitor.

[0014] The free ends of each damping resistor and damping capacitor are soldered to the circuit board of the RC snubber unit, which is fixed to the RC snubber fastener, which is fixed to the heat sink.

[0015] Preferably, an upper high-voltage insulator and a lower high-voltage insulator are respectively provided at the top and bottom of the housing.

[0016] Preferably, the thyristor valve body is further provided with a first terminal, a second terminal, a third terminal, a fourth terminal and a fifth terminal, wherein the first terminal, the second terminal, the third terminal, the fourth terminal and the fifth terminal are respectively connected to the MCR terminal M1, the terminal M2, the terminal D2, the MCR terminal D1 and the terminal N1.

[0017] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0018] The present invention provides a compact self-cooling thyristor valve that integrates the heat sink and the housing into one unit, effectively reducing the amount of material used and thus reducing the size of the thyristor valve; effectively solving the problem of excessive size of existing self-cooling thyristor valves.

[0019] Furthermore, the modular structure of this invention, such as the use of thyristor modules, diode modules, and RC snubber units, helps to reduce volume.

[0020] Furthermore, the present invention employs a fuse, which prevents the thyristor module from being damaged during overcurrent, and makes it easy to replace if damaged.

[0021] Furthermore, the present invention employs a substrate with a certain thickness and multiple heat dissipation teeth, which effectively increases the heat capacity of the heat sink and also increases the heat dissipation capacity, thus helping to reduce the temperature rise of the heat sink to the air.

[0022] Furthermore, the present invention uses multiple MCR terminals for connection, which is beneficial for equipment molding and makes wiring convenient and aesthetically pleasing.

[0023] In summary, this invention uses modular components for arrangement and integrates the heat sink and the outer casing into one, which greatly reduces the size of the equipment, reduces power consumption, and facilitates modular production.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0025] Figure 1 Wiring diagram of MCR and thyristor valve;

[0026] Figure 2 Define the wiring terminals for MCR and thyristor valves;

[0027] Figure 3 Component layout diagram for MCR valve assembly box;

[0028] Figure 4 Top view of the MCR valve assembly box components;

[0029] Figure 5 Here is the connection diagram for the RC snubber unit;

[0030] Among them, 1-thyristor module, 2-diode module, 3-fuse assembly, 301-fuse, 302-fuse base, 4-RC snubber unit, 401-damping resistor, 402-damping capacitor, 403-RC snubber unit circuit board, 404-RC snubber fixing component, 5-lead, 501-first lead, 502-second lead, 503-third lead, 504-fourth lead, 6-low voltage insulator, 601-first low voltage insulator, 602-second low voltage insulator, 603-third low voltage insulator, 7-heat sink, 8-terminal, 801-first terminal, 802-second terminal, 803-third terminal, 804-fourth terminal, 805-fifth terminal, 9-high voltage insulator, 901-upper high voltage insulator, 902-lower high voltage insulator, 10-shell, 11-trigger unit. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings.

[0032] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0033] Static Var Compensators (SVCs) are the best method and approach to solve the aforementioned problems. SVCs were developed based on mechanically switched capacitors and reactors, replacing mechanical switches with large-capacity thyristors. They can rapidly change the reactive power they generate, possessing strong reactive power regulation capabilities. They can provide dynamic reactive power to the power system, compensating the system voltage to a reasonable level. By dynamically regulating reactive power, SVCs suppress bus voltage fluctuations caused by impulsive loads, facilitating transient voltage recovery and improving system voltage stability.

[0034] SVCs include thyristor controlled reactors (TCRs) and megnetic controlled reactors (MCRs). Among them, the thyristor valve is one of the core control devices of the MCR-type SVC, which can provide an effective way to achieve dynamic reactive power compensation, reduce voltage fluctuations, stabilize system voltage levels, and solve problems such as charging power and reactive power backfeed in power systems.

[0035] The thyristor valve assembly is one of the core components of the MCR-type SVC system. This equipment provides an effective way to achieve dynamic reactive power compensation in power systems, reduce voltage fluctuations, stabilize system voltage levels, and solve problems related to charging power and reactive power backfeed. Furthermore, the MCR equipment can be applied to higher voltage levels. This embodiment of the invention uses an MCR-type SVC as an example, where the MCR-type SVC is directly connected to a 6-110kV power grid.

[0036] See Figures 1-5 , Figure 1 The diagram shows the wiring schematic of the MCR and thyristor valve provided in an embodiment of the present invention; Figure 2 The MCR and thyristor valve terminal definitions provided in the embodiments of the present invention are shown; Figure 3 This diagram shows the component layout of the MCR valve assembly box provided in an embodiment of the present invention; Figure 4 A top view of the MCR valve assembly box components provided in an embodiment of the present invention is shown; Figure 5 The diagram shows the connection of the RC snubber unit provided in an embodiment of the present invention.

[0037] like Figure 3 and Figure 4 As shown, the present invention provides a compact self-cooling thyristor valve, comprising a thyristor module 1, a diode module 2, a fuse assembly 3, an RC snubber unit 4, a lead wire 5, a low-voltage insulator 6, a heat sink 7, a terminal block 8, a high-voltage insulator 9, a housing 10, and a trigger unit 11, wherein the thyristor module 1, diode module 2, fuse assembly 3, RC snubber unit 4, low-voltage insulator 6, high-voltage insulator 9, and trigger unit 11 are all disposed within the housing 10.

[0038] The outer casing 10 is a frame structure with openings at both ends. A radiator 7 is installed at one opening end of the frame structure, and a sealed door is provided at the other opening end.

[0039] The RC absorption unit 4 is disposed at the top of the inner cavity of the outer casing 10.

[0040] Below the RC absorption unit 4, a diode module 2, a thyristor module 1, and a fuse assembly 3 are arranged in sequence.

[0041] The high-voltage insulator 9 is disposed at the upper and lower ends of the outer wall of the outer casing 10.

[0042] The triggering unit 11 is located beside the diode module 2, the thyristor module 1, and the fuse assembly 3.

[0043] The thyristor module 1, diode module 2, fuse assembly 3, RC snubber unit 4, and trigger unit 11 are all mounted on the side wall of the heat sink 7.

[0044] Among them: such as Figure 1 , Figure 2 As shown, the thyristor module 1 has a common cathode structure, and the cathode of the thyristor module 1 is connected in series with the cathode of the diode module 2. The anode of the diode module 2 is connected in series with the fourth terminal 804 of the terminal 8.

[0045] The cathode of the thyristor module 1 is also connected in series with a third terminal 803 of the terminal block 8.

[0046] The anode of the thyristor module 1 is connected in series with the fuse assembly 3, and the fuse assembly 3 is connected to the first terminal 801 and the second terminal 802 of the terminal block 8.

[0047] The thyristor module 1 is model MTK300-3600.

[0048] The terminal 8 is connected to the MCR winding.

[0049] The diode module 2 is model MDC300-3600.

[0050] The fuse assembly 3 includes two fuses 301, each fuse 301 is mounted on a fuse base 302, and each fuse 301 is provided with a fuse indicator.

[0051] One end of each of the two fuses 301 is connected in series with the anode of the thyristor module 1.

[0052] The other ends of the two fuses 301 are connected to the first terminal 801 and the second terminal 802, respectively.

[0053] The RC absorption unit 4 includes three damping resistors 401 connected in parallel, and one end of each damping resistor 401 is connected in series with a damping capacitor 402.

[0054] The other end of each damping resistor 401 is soldered to the RC absorption unit circuit board 403, and is connected in series with the first lead 405, the second lead 406 and the third lead 407 provided on the RC absorption unit circuit board 403 respectively.

[0055] The other ends of the three damping capacitors 402 are connected in parallel and soldered onto the RC snubber circuit board 403. They are also connected in series with the fourth pin on the RC snubber circuit board 403.

[0056] The circuit board 403 of the resistor-capacitor absorption unit is fixed on the resistor-capacitor absorption fastener 404, and the resistor-capacitor absorption fastener 404 is fixed on the heat sink 7.

[0057] The first lead 405, the second lead 406 and the third lead 407 are connected in series with the anode of the thyristor module 1 and the anode of the diode module 2, respectively; the fourth lead 408 is connected in series with the cathode of the thyristor module 1 and the cathode of the diode module 2.

[0058] The cathode of the thyristor module 1 is provided with a fifth terminal, and the cathode of the diode module 2 is provided with a sixth terminal. The fifth terminal and the sixth terminal are connected by the first lead 501 of the lead 5.

[0059] The fifth terminal is fixed to the radiator 7 by the first low-voltage insulator 601.

[0060] The sixth terminal is fixed to the radiator 7 by the third low-voltage insulator 603.

[0061] The anode of the thyristor module 1 is provided with a seventh terminal and an eighth terminal, wherein the seventh terminal and the eighth terminal are both connected to the fuse assembly 3 via a second lead 502.

[0062] The ninth terminal of the anode of the diode module 2 is connected to the second low-voltage insulator 602 and the first low-voltage insulator 601 respectively via the third lead 503; the second low-voltage insulator 602 is fixed on the heat sink 7.

[0063] The radiator 7 includes a base plate and multiple heat dissipation teeth, wherein the multiple heat dissipation teeth are evenly distributed on the base plate; the side wall of the base plate is provided with mounting holes for mounting the housing 10 and the upper and lower high voltage insulators.

[0064] The thyristor module 1, diode module 2, fuse assembly 3, RC snubber unit 4, and trigger unit 11 are all mounted on the end face of the substrate.

[0065] The high-voltage insulator 9 includes an upper high-voltage insulator 901 and a lower high-voltage insulator 902, wherein the upper high-voltage insulator 901 and the lower high-voltage insulator 902 are respectively placed at the top and bottom of the housing 10; used to support and fix the radiator 7 and the housing 10, and to insulate the radiator 7 and the housing 10 from other phases or ground potential.

[0066] The input terminal of the trigger unit 11 is connected to a power supply. The trigger unit 11 includes a signal output terminal and an optical fiber output terminal. The signal output terminal is connected to the signal input terminal of the thyristor module 1. The optical fiber output terminal is connected to the controller.

[0067] The trigger unit 11 is integrated on a circuit board, which not only reduces the size but also facilitates wiring.

[0068] The self-cooling thyristor valve of the present invention is connected to MCR terminal M1 via the first terminal 801, to MCR terminal M2 via the second terminal 802, to MCR terminal D2 via the third terminal 803, to MCR terminal D1 via the fourth terminal 804, and to MCR terminal N1 via the fifth terminal 805. This facilitates equipment molding and makes wiring convenient and aesthetically pleasing.

[0069] Working principle of the invention:

[0070] Based on the topology of the thyristor valve for MCR control, the size of the thyristor valve capacity, and the structure of the heat sink, relevant components were selected. Considering the principles of simple wiring, horizontal and vertical alignment, and quick and easy wiring, as well as insulation performance, aesthetics, and ease of installation and maintenance, a thick-based heat sink, thyristors, and diode modules with satisfactory heat dissipation performance were selected. Furthermore, the RC snubber element was integrated onto the RC snubber unit circuit board, and the trigger unit was designed according to the arrangement of other components and leads on the heat sink. This resulted in the compact miniaturization of the thyristor valve for MCR control, reducing material usage, saving costs, and facilitating installation and maintenance.

[0071] The function of the thyristor module is to control the DC component flowing through the winding, thereby controlling the output capacity of the reactor. The function of diode module 2 is to control the winding freewheeling current. The function of fuse 301 is to protect the thyristor module from damage in case of overcurrent.

[0072] Modular components are used, such as thyristor module 1, diode module 2, fuse assembly 3, RC snubber unit 4, lead wire 5, and trigger unit 11. The heat sink and the fixing parts are integrated into one, which greatly reduces the size of the equipment, reduces power consumption, and facilitates modular production.

[0073] The use of an aluminum profile heat sink 7 with a substrate of a certain thickness and multiple heat dissipation teeth increases the heat capacity of the heat sink 7 and also increases the heat dissipation capacity, which helps to reduce the temperature rise of the heat sink to the air.

[0074] Damping resistor 401 and damping capacitor 402 serve as overvoltage protection, converting electromagnetic energy into the electric field energy of the capacitor for storage. The capacitor voltage cannot change abruptly, effectively suppressing overvoltage. The series resistor can dissipate some of the energy that generates overvoltage.

[0075] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0076] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0077] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A compact self-cooling thyristor valve, characterized in that, The device includes a housing (10), a radiator (7), and a thyristor valve body. The housing (10) is a frame structure with openings at both ends, and the radiator (7) is installed at one of the opening ends of the housing (10). The thyristor valve body is placed in the inner cavity of the housing (10) and is installed on the radiator (7). The thyristor valve body includes a thyristor module (1), a diode module (2), a fuse assembly (3), an RC snubber unit (4), and a trigger unit (11). The thyristor module (1), the diode module (2), the fuse assembly (3), and the RC snubber unit (4) are all mounted on the substrate of the heat sink (7). The RC absorption unit (4) is arranged at the top of the inner cavity of the housing (10). Below the RC absorption unit (4), a diode module (2), a thyristor module (1) and a fuse assembly (3) are arranged in parallel. The trigger unit (11) is arranged on the side of the diode module (2), the thyristor module (1) and the fuse assembly (3). The top and bottom of the outer casing (10) are respectively provided with an upper high-voltage insulator (901) and a lower high-voltage insulator (902).

2. The compact self-cooling thyristor valve according to claim 1, characterized in that, The heat sink (7) includes a substrate on which a plurality of heat dissipation teeth are evenly distributed.

3. A compact self-cooling thyristor valve according to claim 1, characterized in that, The terminals provided on the thyristor module (1) and the diode module (2) are fixed to the heat sink (7) through low-voltage insulating terminals (6).

4. A compact self-cooling thyristor valve according to claim 1, characterized in that, The RC absorption unit (4) includes three damping resistors (401) connected in parallel, and a damping capacitor (402) is connected in series at one end of each damping resistor (401). The pins of the free ends of each damping resistor (401) and damping capacitor (402) are soldered to the circuit board (403) of the RC absorption unit, which is fixed on the RC absorption fixture (404) and the RC absorption fixture (404) is fixed on the heat sink (7).

5. A compact self-cooling thyristor valve according to claim 1, characterized in that, The thyristor valve body is also provided with a first terminal (801), a second terminal (802), a third terminal (803), a fourth terminal (804), and a fifth terminal (805), wherein the first terminal (801), the second terminal (802), the third terminal (803), the fourth terminal (804), and the fifth terminal (805) are respectively connected to the MCR terminal M1, terminal M2, terminal D2, MCR terminal D1, and terminal N1.

Images