IGCT-based outdoor capacitor reactive power compensation device and installation method

Abstract

The application relates to an IGCT-based outdoor capacitive reactive power compensation device and a mounting method, and a reactive power compensation assembly, which comprises a current-limiting resistor, a positive valve stage assembly, a negative valve stage assembly and a cabin; the positive valve stage assembly and the negative valve stage assembly are connected in series with the current-limiting resistor after being connected in parallel; the positive valve stage assembly and the negative valve stage assembly are symmetrically closed in the cabin, the cabin has the functions of waterproofness, dustproofness and heat insulation, and can be pulled out to the outside of the cabin in a whole after a cabin door is opened. The modular design of each part in the compensation device is simple and convenient, and high in efficiency. The modules slide left and right in the cabin, any electrical component in the assembly can be replaced on line, and the on-site maintenance is convenient. The IGCT valve sections are located on both sides of the valve assembly, the capacitor assembly and the driving unit are arranged in the middle, each valve section and module unit can be assembled respectively, and large-scale production line assembly is facilitated. The damping resistor and the current-limiting resistor are arranged in the heat sinks in the valve sections, the internal space of the heat sinks is efficiently utilized, and the modules are more compact.

Description

Technical Field

[0001] This invention relates to the technical field of outdoor capacitor reactive power compensation device based on IGCT, and particularly to an outdoor capacitor reactive power compensation device based on IGCT and its installation method. Background Technology

[0002] In recent years, with the development of high-voltage direct current (HVDC) transmission technology, large converter transformers have been increasingly used in power systems. This has placed higher demands on the controllability of capacitor towers, and capacitor reactive power compensation components can improve the controllability of capacitor towers.

[0003] Capacitor reactive power compensation components require independent installation and must be waterproof, dustproof, and heat-insulated. In practice, multiple capacitor reactive power compensation components may need to be cascaded depending on the requirements. In outdoor environments, they often need to be housed in a shelter or valve room, significantly increasing installation costs.

[0004] How to provide an outdoor capacitor reactive power compensation device based on IGCT that is easy to install and maintain is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an outdoor capacitor reactive power compensation device and installation method based on IGCT. Under the premise of meeting electrical requirements, the positions of each unit are reasonably arranged to achieve a coordinated and compact structure of the entire assembly with reasonable internal electrical connection wiring, and it can be installed and used independently outdoors.

[0006] To achieve the above objectives, the present invention provides an outdoor capacitor reactive power compensation device based on IGCT, including a current-limiting resistor, a positive valve stage assembly, a negative valve stage assembly, and a cabin.

[0007] The forward valve stage assembly is composed of several forward valve stages connected in series;

[0008] The negative valve stage assembly is composed of several negative valve stages connected in series;

[0009] The positive valve stage assembly and the negative valve stage assembly are connected in parallel and then connected in series with the current-limiting resistor.

[0010] The positive valve stage assembly and the negative valve stage assembly are symmetrically enclosed within the cabin, and can be pulled out of the cabin as a whole after the cabin door is opened.

[0011] Furthermore, both the positive valve stage and the negative valve stage include an IGCT valve section, a damping capacitor, a damping circuit, a voltage equalization resistor, a drive unit, and a power supply unit;

[0012] Each of the IGCT valve segments has two ends as connection points, and the IGCT valve segments are crimped together. Each connection point is equipped with a heat sink, the damping resistor is set in the corresponding heat sink, and the current limiting resistor is set in the heat sink of the end IGCT valve segment.

[0013] The voltage equalizing resistor is disposed on the surface of the corresponding heat sink;

[0014] The damping capacitor is disposed inside the IGCT valve section.

[0015] The drive unit is disposed on the upper surface of the corresponding IGCT valve section; the power supply unit is fixed inside the IGCT valve section, above the damping capacitor.

[0016] Furthermore, the cabin wall includes an inner wall, an intermediate layer, and an outer wall; the intermediate layer is a heat-insulating material.

[0017] Furthermore, the four corners of the cabin adopt a Z-shaped sealing fold structure, and the sealing material is UL94-V0 flame retardant material.

[0018] Furthermore, insulated cable sleeves are installed at both ends of the cabin to lead out cables.

[0019] Furthermore, both the positive valve stage assembly and the negative valve stage assembly are modularly manufactured and assembled into a capacitor reactive power compensation assembly before being directly installed into the cabin.

[0020] Furthermore, each module is supported by two guide rails, with ball bearings on the upper surface of the guide rails, allowing the module to be pulled out; the guide rails are mounted on an insulating beam.

[0021] Furthermore, the chamber is connected to the intermediate potential of the IGCT valve section of the positive valve stage assembly and the negative valve stage assembly.

[0022] On the other hand, an installation method for the outdoor IGCT capacitor reactive power compensation component is provided, including: assembling a capacitor reactive power compensation component support rail;

[0023] (1) Crim the IGCT valve sections together, and crimp a radiator at each connection point;

[0024] (2) Connect the positive and negative valve stage assemblies to the metal support beams at both ends;

[0025] (3) Install the capacitor reactive power compensation component into the cabin; and place the cabin on the support rail;

[0026] (4) Lead the cable out through the outlet sleeve;

[0027] (5) Close the hatch, connect the cable and use it; when a fault occurs, replace the internal components of the positive valve stage assembly, the internal components of the negative valve stage assembly or the current limiting resistor according to the fault type.

[0028] Furthermore, both the positive valve stage and the negative valve stage include an IGCT valve section, a damping capacitor, a damping circuit, a voltage equalizing resistor, a drive unit, and a power supply unit; step (3) further includes: installing all the damping capacitors onto the mounting plate, installing the mounting plate onto the metal support beams at both ends; inserting the current limiting resistor and the damping resistor into the heat sink and fixing them to the heat sink; installing the voltage equalizing resistor onto the surface of the heat sink; fixing the drive unit onto the upper surface of the corresponding IGCT valve section; and installing the power supply unit onto the inner side of the valve stage assembly.

[0029] The above-described technical solution of the present invention has the following beneficial technical effects:

[0030] (1) The components of the present invention are modularly designed, making assembly simple and efficient.

[0031] (2) The component implementation module of the present invention can slide left and right in the cabin, and any electrical component in the component can be replaced online, making on-site maintenance very convenient.

[0032] (3) The components of the present invention adopt a modular design. The IGCT valve section is located on both sides of the valve assembly, and the capacitor assembly and drive unit are placed in the middle. Each valve section and module unit can be assembled separately, which is convenient for large-scale production line assembly.

[0033] (4) The present invention places both the damping resistor and the current limiting resistor in the heat sink inside the valve section, making efficient use of the internal space of the heat sink and making the module more compact.

[0034] (5) The external electrical connection of the component of the present invention adopts sleeve connection, which is convenient, reliable and has good insulation.

[0035] (6) The component cabin potential and the module intermediate potential of the present invention are connected at the same potential, which reduces the electrical distance requirement between the internal wall of the cabin and the module, and effectively reduces the cabin volume.

[0036] (7) Insulated rails are installed so that capacitor reactive power compensation devices can be cascaded longitudinally, which is convenient for assembly and use.

[0037] (8) The components of this invention are equipped with multiple layers of protection, which can effectively achieve high-level waterproof, dustproof, fireproof, and heat insulation requirements. It can operate normally in outdoor ambient temperatures ranging from -40℃ to +60℃. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the IGCT valve assembly.

[0039] Figure 2 Single-stage IGCT schematic diagram;

[0040] Figure 3 A schematic diagram of the supporting guide rail structure;

[0041] Figure 4 A schematic diagram of module assembly;

[0042] Figure 5 A schematic diagram of the cabin assembly;

[0043] Figure 6 This is a schematic diagram of the overall assembly of the components;

[0044] Figure 7 Assembly diagram of IGCT valve section. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0046] The present invention provides an outdoor capacitor reactive power compensation device based on IGCT, comprising a current limiting resistor, a positive valve stage assembly, a negative valve stage assembly, and a housing.

[0047] Combination Figure 1 A single valve assembly can be connected in series with different numbers of IGCT valve stages to adapt to different voltage levels and transmission capacities, depending on specific application requirements. This invention uses a 13-stage series connection as an example; the electrical schematic is shown below. Figure 1 As shown, R is the current-limiting resistor, V1p to V13p are the IGCT valve stages of the positive valve stage assembly, and V1n to V13n are the IGCT valve stages of the negative valve stage assembly.

[0048] The forward and negative valve stages have the same structure. The valve stage schematic is shown below. Figure 2 As shown, the IGCT valve stage mainly consists of a reverse-resistance IGCT, a gate-level drive unit, a power supply unit, a damping circuit, and voltage equalization resistors. R1 is the damping resistor, C is the damping capacitor, and R2 is the voltage equalization resistor. The gate-level drive unit controls the valve stage's on / off state. The power supply unit supplies power to the circuit. The voltage equalization resistor provides static voltage equalization. The damping resistor and damping capacitor are connected in series to provide damping and prevent damage to the IGCT due to overvoltage.

[0049] The positive and negative valve stage assemblies are connected in parallel and then in series with a current-limiting resistor. Both the positive and negative valve stage assemblies are modularly manufactured and symmetrically enclosed within the cabin. After the cabin door is opened, each assembly can be pulled out of the cabin as a whole.

[0050] Combination Figure 3 Each module is supported by two guide rails, with ball bearings on the upper surface of the guide rails, allowing the module to be pulled out; the guide rails are fixed to the I-shaped insulating beam.

[0051] Combination Figure 4 Both the positive valve stage and the negative valve stage include an IGCT valve section, a damping capacitor, a damping circuit, an equalizing resistor, a drive unit, and a power supply unit.

[0052] Each of the IGCT valve segments has two ends as connection points, and the IGCT valve segments are crimped together. Each connection point is provided with a heat sink, the damping resistor is set in the corresponding heat sink, and the current limiting resistor is set in the heat sink of the end IGCT valve segment.

[0053] The voltage equalizing resistor is disposed on the surface of the corresponding heat sink. The driving unit is disposed on the upper surface of the corresponding IGCT valve section, and the power supply unit is fixed inside the IGCT valve section, above the damping capacitor.

[0054] The damping capacitors are located inside the IGCT valve section. All damping capacitors are mounted on the mounting plate, and the mounting plate is then mounted to the metal support beam.

[0055] The IGCT valve section is located on both sides of the valve assembly, with the capacitor assembly and drive unit placed in the middle. Each valve section and module unit can be assembled separately, which facilitates assembly on a large-scale production line.

[0056] Maintenance hatches are located on both sides of the cabin. Module maintenance can be performed by opening the side maintenance hatches and pulling out the module. The cabin wall employs a three-layer sealing design: an outer wall, a middle layer, and an inner wall. The four corners feature a Z-shaped sealing fold structure, effectively achieving waterproof, dustproof, and heat-insulating sealing requirements. The sealing material uses UL94-V0 flame-retardant material, meeting fire protection requirements. Figure 5 As shown. Insulated cable sleeves are installed at both ends of the cabin to lead out cables and improve insulation performance.

[0057] The module is assembled into the cabin. The mounting handles on both sides of the module allow for flexible pulling to the desired position and facilitate routine maintenance. The module connects to the foundation at the bottom of the cabin, completing the component assembly. Figure 6 As shown.

[0058] Another aspect of the present invention provides an installation method for the outdoor IGCT capacitor reactive power compensation component, comprising the following steps:

[0059] (1) Assemble the insulating support beam and insulating guide rail into a capacitor reactive power compensation component support guide rail;

[0060] (2) Press-fit the IGCT valve sections together, and press-fit a radiator at each connection point to complete the assembly of the valve sections;

[0061] (3) Install all the damping capacitors onto the mounting plate, and then install the mounting plate onto the metal support beams at both ends;

[0062] (4) Insert the current-limiting resistor and damping resistor into the heat sink and fix them to the heat sink. Figure 7 ;

[0063] (5) Install the equalizing resistor onto the surface of the heat sink;

[0064] (6) Fix the drive unit to the upper surface of the corresponding IGCT valve section;

[0065] (7) Install the power supply unit to one side of the valve stage assembly;

[0066] (8) Connect the positive and negative valve stage assemblies to the metal support beams at both ends;

[0067] (9) Install the capacitor reactive power compensation component into the cabin; and place the cabin on the support rail;

[0068] (10) Lead the cable out through the outlet sleeve;

[0069] (11) Close the hatch, connect the cables and use it. When a fault occurs, replace the internal components of the positive valve stage assembly, the internal components of the negative valve stage assembly, or the current-limiting resistor according to the fault type.

[0070] In summary, this invention relates to an outdoor capacitor reactive power compensation device and installation method based on IGCT. The reactive power compensation component includes a current-limiting resistor, a positive valve stage component, a negative valve stage component, and a housing. The positive and negative valve stage components are connected in parallel and then in series with the current-limiting resistor. The positive and negative valve stage components are symmetrically enclosed within the housing, which is waterproof, dustproof, and heat-insulating. Each component can be pulled out of the housing as a whole after the hatch is opened. The modular design of each part of the component in this invention makes assembly simple and efficient. The module can slide left and right within the housing, allowing for online replacement of any electrical component, making on-site maintenance very convenient. The IGCT valve sections are located on both sides of the valve assembly, with the capacitor assembly and drive unit placed in the middle. Each valve section and module unit can be assembled separately, facilitating large-scale production line assembly. The damping resistor and current-limiting resistor are both placed inside the heat sink of the valve section, efficiently utilizing the internal space of the heat sink and making the module more compact.

[0071] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An outdoor capacitor reactive power compensation device based on IGCT, characterized in that, This includes current-limiting resistors, positive valve stage components, negative valve stage components, and the cabin. The forward valve stage assembly is composed of several forward valve stages connected in series; The negative valve stage assembly is composed of several negative valve stages connected in series; The positive valve stage assembly and the negative valve stage assembly are connected in parallel and then connected in series with the current-limiting resistor. The positive valve stage assembly and the negative valve stage assembly are symmetrically enclosed in the cabin, and can be pulled out of the cabin as a whole after the cabin door is opened; Both the positive valve stage and the negative valve stage include an IGCT valve section, a damping capacitor, a damping circuit, an equalizing resistor, a drive unit, and a power supply unit. Each of the IGCT valve segments has two ends as connection points, the IGCT valve segments are crimped together, each connection point is provided with a heat sink, the damping capacitor is connected in series with a damping resistor, the damping resistor is set in the corresponding heat sink, and the current limiting resistor is set in the heat sink of the end IGCT valve segment. The voltage equalizing resistor is disposed on the surface of the corresponding heat sink; The damping capacitor is disposed inside the IGCT valve section. The drive unit is disposed on the upper surface of the corresponding IGCT valve section; the power supply unit is fixed inside the IGCT valve section, above the damping capacitor; Both the positive valve stage assembly and the negative valve stage assembly are modularly manufactured and assembled into a capacitor reactive power compensation assembly before being directly installed into the cabin. Each module is supported by two guide rails, with ball bearings on the upper surface of the guide rails, allowing the module to be pulled out; the guide rails are mounted on an insulating beam. The chamber is connected to the intermediate potential of the IGCT valve section of the positive valve stage assembly and the negative valve stage assembly.

2. The outdoor capacitor reactive power compensation device based on IGCT according to claim 1, characterized in that, The cabin wall includes an inner wall, an intermediate layer, and an outer wall; the intermediate layer is a heat insulation material.

3. The outdoor capacitor reactive power compensation device based on IGCT according to claim 2, characterized in that, The four corners of the cabin adopt a Z-shaped sealing fold structure, and the sealing material is UL94-V0 flame retardant material.

4. The outdoor capacitor reactive power compensation device based on IGCT according to claim 1, characterized in that, Insulated cable sleeves are installed at both ends of the cabin to lead out cables.

5. An installation method for an outdoor capacitor reactive power compensation device for an outdoor IGCT as described in any one of claims 1 to 4, characterized in that, include: Assemble into a capacitor reactive power compensation component support rail; (1) Crimp the IGCT valve sections together, and crimp a radiator at each connection point; (2) Connect the positive and negative valve stage assemblies to the metal support beams at both ends; (3) Install the capacitor reactive power compensation component into the cabin; The cabin was then placed on the support rails. (4) Lead the cable out through the outlet sleeve; (5) Close the hatch, connect the cable and use it; when a fault occurs, replace the internal components of the positive valve stage assembly, the internal components of the negative valve stage assembly or the current limiting resistor according to the fault type.

6. The installation method according to claim 5, characterized in that, Both the positive valve stage and the negative valve stage include an IGCT valve section, a damping capacitor, a damping circuit, a voltage equalizing resistor, a drive unit, and a power supply unit; step (3) further includes: installing all the damping capacitors onto the mounting plate, installing the mounting plate onto the metal support beams at both ends; inserting the current limiting resistor and the damping resistor into the heat sink and fixing them to the heat sink; installing the voltage equalizing resistor onto the surface of the heat sink; fixing the drive unit onto the upper surface of the corresponding IGCT valve section; and installing the power supply unit onto the inner side of the valve stage assembly.

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