WO2019201357A1

WO2019201357A1 - Converter valve cooling water circuit

Info

Publication number: WO2019201357A1
Application number: PCT/CN2019/091598
Authority: WO
Inventors: 贺之渊; 周建辉; 王航; 王治翔; 谢剑; 李云鹏
Original assignee: 全球能源互联网研究院有限公司; 国家电网有限公司
Priority date: 2018-04-17
Filing date: 2019-06-17
Publication date: 2019-10-24
Also published as: CN108495529A

Abstract

Provided is a converter valve cooling water circuit, comprising a converter valve module cooling water circuit, wherein a water inlet main pipe is connected to a water outlet main pipe via a water flow branch circuit and a cooling element, a first voltage-equalising electrode is a three-way conductor connecting piece connected to one end of the water inlet main pipe to act as a water inlet, a second voltage-equalising electrode is a plug-type conductor connecting piece connected to the other end of the water inlet main pipe so that the other end of the water inlet main pipe forms a blind end, a third voltage-equalising electrode is a plug-type conductor connecting piece connected to one end of the water outlet main pipe so that the one end of the water outlet main pipe forms a blind end, and a fourth voltage-equalising electrode is a three-way conductor connecting piece connected to the other end of the water outlet main pipe to act as a water outlet.

Description

Converter valve cooling waterway

The present disclosure claims priority to Chinese Patent Application No. 201810345005.6, filed on Apr. 17, 2018, the entire disclosure of which is hereby incorporated by reference.

Technical field

This paper relates to the field of power electronics manufacturing technology, for example, to a converter valve cooling water circuit.

Background technique

At present, the rapid development of high-voltage DC technology plays an important role in the optimal allocation of energy in China, and high-voltage DC power equipment adopts high-power power electronic device converter technology. Power equipment converter power electronic components, cooling components and cooling pipelines are important components of high-voltage DC power equipment. The cooling medium of a certain flow rate is increased by the pressure of the power equipment cooling system, and enters the cooling element through the cooling line of the power equipment. The heat generated by the variable-current power electronic device is generated and transmitted to the cooling element, and then enters the outdoor heat exchange device, and the heat is discharged into the air through the outdoor heat exchange device, and the cooled medium is then passed through the power device cooling system to increase the pressure into the power device. The components are cooled to form a closed loop to ensure that the temperature of the power device variable power electronics is within the normal range.

In the existing converter valve manifold module, the main cooling water pipe includes an inlet main pipe and a main water outlet pipe, and an electrode for fixing a potential in the main pipe of the cooling water is provided on the main pipe of the inlet and outlet water, and the electrode includes platinum extending into the corresponding pipe. Pins, the metal components in the cooling water circuit of the converter valve module generate electrolysis current, and the inlet and outlet pipes at the same position have the same potential through the electrodes, ensuring voltage balance between them, no leakage current, and electrolysis current from the metal components. Transfer to the inert metal electrode to avoid electrical corrosion of the metal component; or the electrode body used generally has only one or more straight cylindrical electrode pins inserted on the electrode base, and the surface area of the electrode is too small to cause electric field strength The concentrated distribution is prone to scaling problems, resulting in blocked coolant flow and reduced cooling effect. The components such as damping resistors and reactors are affected by poor heat dissipation, which can cause damage to the DC system. In the case of serious conditions, the above two cases need to be fixed with a needle-shaped platinum electrode, and the electrode is mounted. There is also a need to perforate the surface of the water pipe or component, which increases the risk of leakage of cooling water, and corrosion and water leakage of the cooling components of the power equipment may result in a reduction in the insulation level of the equipment or even a fire accident.

Summary of the invention

In view of this, the embodiment of the present invention provides a converter valve cooling waterway to solve the problem that the converter water module cooling water passage in the existing converter valve cooling water path is easily fouled and corroded by the needle-shaped platinum electrode, and is required for installation. The problem of perforating the surface of a water pipe or component.

Embodiments of the present invention provide a converter valve cooling water passage including a converter valve module cooling water passage, the converter valve module cooling water passage including an inlet water main pipe, a water discharge main pipe, and a cooling element, wherein the water inlet main pipe passes through the water flow branch The road and the cooling element are connected to the water discharge main pipe, and the converter valve module cooling water circuit further includes: a first voltage equalizing electrode, which is a three-way conductor connecting member, and is connected to one end of the water inlet main pipe, as a second pressure equalizing electrode is a plug type conductor connecting member connected to the other end of the water inlet main pipe, so that the other end of the water inlet main pipe forms a blind end; the third equalizing electrode is a plug-type conductor connection member connected to one end of the water discharge main pipe, such that one end of the water discharge main pipe forms a blind end; the fourth pressure equalizing electrode is a three-way conductor connecting member, and the other end of the water discharge main pipe Connected as a water outlet; wherein the first voltage equalizing electrode is equipotentially connected to the third voltage equalizing electrode, and the second voltage equalizing electrode is equipotentially connected to the fourth voltage equalizing electrode.

DRAWINGS

In order to more clearly illustrate the specific embodiments herein or the technical solutions in the prior art, the drawings used in the specific embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present disclosure, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

1 is a block diagram showing the structure of a cooling water circuit of a converter valve module according to an embodiment of the present invention;

2 is a schematic view of a first equalizing electrode and a third voltage equalizing electrode according to an embodiment of the present invention;

3 is a schematic view of a cooling valve module cooling water passage according to an alternative embodiment of the present invention;

4 is a schematic view of a heat sink according to an embodiment of the present invention;

Figure 5 is a schematic diagram of water cooling of a converter valve in accordance with an embodiment of the present invention;

Figure 6 is a schematic illustration of a converter valve cooling water circuit in accordance with an embodiment of the present invention.

Among them, 11-influent main pipe, 12-outlet main pipe, 13-cooling element, 14-first equalizing electrode, 15-second equalizing electrode, 16-third equalizing electrode, 17-fourth Pressure electrode, 131-heat sink, 132-reactor, 51-return valve module cooling water circuit, 52-bypass water pipe, 61-insulated water pipe, 62-layer insulated water pipe.

detailed description

The technical solutions herein will be described clearly and completely in conjunction with the accompanying drawings. It is obvious that the described embodiments are a part of the embodiments herein, and not all embodiments. In the description herein, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are indicated. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplified description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed in a specific orientation, and Operation, therefore, cannot be construed as a limitation on this document. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description herein, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or connected integrally; may be mechanical connection or electrical connection; may be directly connected, may also be indirectly connected through an intermediate medium, or may be internal communication between two components, may be a wireless connection, or may be a wired connection . The specific meanings of the above terms herein may be understood by one of ordinary skill in the art.

Further, the technical features involved in the different embodiments described herein may be combined with each other as long as they do not constitute a conflict with each other.

Example 1

In the present embodiment, a converter valve module cooling water passage is provided. FIG. 1 is a structural block diagram of a converter valve module cooling water passage according to an embodiment of the present invention. As shown in FIG. 1, the converter valve module cooling water passage 51 includes The water main pipe 11, the water discharge main pipe 12, and the cooling element 13, wherein the water inflow main pipe 11 is connected to the water discharge main pipe 12 through the water flow branch and the cooling element 13, and the first equalizing electrode 14 is a three-way conductor connecting piece, and the water inflow main pipe One end of 11 is connected as a water inlet; the second equalizing electrode 15 is a plug type conductor connecting member, and is connected to the other end of the water inlet main pipe 11, so that the other end of the water inlet main pipe 11 forms a blind end; the third pressure equalizing The electrode 16 is a plug-type conductor connecting member, and is connected to one end of the water discharge main pipe 12, so that one end of the water discharge main pipe 12 forms a blind end; the fourth equalizing electrode 17 is a three-way conductor connecting piece, and the other water discharging main pipe 12 One end is connected to serve as a water outlet; wherein the first voltage equalizing electrode 14 is equipotentially connected to the third voltage equalizing electrode 16, and the second voltage equalizing electrode 15 is equipotentially connected to the fourth voltage equalizing electrode 17. Specifically, the water inlet main pipe 11 and the water discharge main pipe 12 are PVDF type and the same program inlet and outlet water main pipe, and the first pressure equalizing electrode 14 and the third equalizing electrode 16 are of a three-way design, equipotential bonding, and the structure thereof is as shown in FIG. 2 . As shown, it is formed by welding seamless steel pipe and flange, which can be used as water inlet and outlet, or as an electrode, which can be used to enhance the electric corrosion resistance of metal components of power equipment cooling pipelines and realize cooling components of power equipment. Long-term potential equalization clamp. The second equalizing electrode 15 and the fourth equalizing electrode 17 are plug-type mounted on the blind end of the main water pipe, and are equipotentially connected to realize integration of the water pipe plug and the electrode, thereby avoiding the existing electrode mounting. The problem of special welding or screwing plugs is required, and the installation of the needle-shaped platinum electrode is easy to scale and corrode, and special drilling is required, which is easy to leak, so that the corrosion resistance, sealing performance and maintenance workload of the metal components are greatly optimized.

3 is a schematic diagram of a converter valve module cooling water circuit in accordance with an alternative embodiment herein, as shown in FIG. 3, in an alternative embodiment, the cooling element 13 includes a heat sink 131, and a plurality of sets of heat sinks 131 are connected in parallel, each The group radiator 131 includes two radiators connected in series, and each group of radiators 131 is connected to the water inlet main pipe 11 through the first branch water pipe, and is connected to the water discharge main pipe 12 through the second branch water pipe, and the cooling water flows through the radiator 131. Taking away the power equipment, the heat generated by the work of the variable-current power electronic device, such as thyristor, IGBT, IGCT/IEGT, etc., reduces the temperature of the device. The schematic diagram of the specific heat sink 131 is as shown in FIG. 4, including the chip resistor 131A and The thyristor heat sink 131B; the cooling element 13 further includes a reactor 132 installed between the water inlet main pipe 11 and the water discharge main pipe 12, the reactor 132 being connected in parallel with the plurality of heat sinks 131 for protecting the variable current power electronic device, the reactance The device 132 is a saturable reactor.

In a specific embodiment, the plurality of first branch water pipes are uniformly arranged and connected to the water inlet main pipe 11, and the plurality of second branch water pipes are evenly arranged and connected to the water discharge main pipe 12. The purpose of the design is to inflow into the water The cooling water of the main pipe 11 is evenly distributed to each set of the radiators 131, thereby avoiding the problem that the existing reversing valve module cooling water passages 51 adopt a single series connection or a single parallel connection of the cooling elements, and the heat dissipation is unbalanced.

In a specific embodiment, the joint of the first branch water pipe is located below the radiator 131, and the joint of the second branch water pipe is located above the radiator 131, that is, the cooling water enters the water from below the radiator 131, and the heat is dissipated. The water is discharged from the top of the device 131. This design can avoid the moisture leakage of the bottom of the valve tower when the existing bottom outlet type radiator 131 leaks. For example, the water leakage may cause the lower valve tower to be short-circuited and fire, and the water outlet of the radiator 131 can be avoided. Both the water inlet and the water inlet are designed to have poor heat transfer at the top of the bottom due to the inability to vent at the bottom. At the same time, the maintenance operation space of the operation and maintenance personnel is expanded, and the maintenance progress is accelerated.

Example 2

The embodiment of the present invention provides a converter valve cooling waterway, which includes the converter valve module cooling waterway in the above embodiment, and FIG. 5 is a water cooling schematic diagram of the converter valve according to an embodiment of the present invention. As shown in FIG. 5, in the present embodiment, the converter valve is arranged in a double row, the converter valve cooling water passage includes a multi-layer converter valve module cooling water passage 51, and the bottom layer is a bypass water pipe 52, and FIG. 6 is according to the present invention. A schematic diagram of the converter valve cooling water passage of the embodiment, as shown in FIG. 6, the top main water pipe of the converter valve cooling water passage is an insulated water pipe 61, which is S-shaped or C-shaped, specifically single row or double row. The PVDF water pipe is arranged, and the converter valve cooling waterway comprises a multi-layer converter valve module cooling waterway, for example, a 2-10 layer converter valve module cooling water passage 51, and each layer of the converter valve module cooling water passage 51 passes between the two layers. The insulating water pipe 62 composed of a semicircular water pipe is connected, and the interlayer insulating water pipe 62 is also a PVDF water pipe, and the shape thereof is S type or C type. The angle between the two semicircles of the interlayer insulating water pipe 62 is 15° to 180°, and optionally, the angle is between 40° and 60°. The converter valve cooling water circuit further includes a bypass water pipe 52 installed at a bottom of the valve tower of the converter valve, and the bypass water pipe 52 is connected to the interlayer insulating water pipe 62 for realizing stable flow of the bottom cooling water, the bypass water pipe A wound wire is disposed in the 52 to prevent the deposition of impurities from causing the discharge to break through the water pipe.

The present invention provides a converter valve cooling water circuit, including a converter valve module cooling water passage, the inlet water main pipe of the converter valve module cooling water passage is connected to the water discharge main pipe through a water flow branch and a cooling element, and the first constant voltage is extremely tee a conductor connecting member connected to one end of the water inlet main pipe as a water inlet; a second piezoelectric equalizing plug type conductor connecting member connected to the other end of the water inlet main pipe to form a blind end at the other end of the water inlet main pipe; The third uniform piezoelectric pole plug type conductor connecting member is connected with one end of the water discharge main pipe, so that one end of the water discharge main pipe forms a blind end; and the fourth piezoelectric equalizing extremely three-type conductor connecting member is connected with the other end of the water discharge main pipe, As the water outlet; wherein the first equalizing electrode is connected to the third equalizing electrode at equal potential, and the second equalizing electrode is connected to the fourth equalizing electrode at equal potential. The pressure equalizing electrode is installed at the water inlet and the blind end of the water pipe, which can realize the voltage balance between the inlet and outlet pipes, and can also be used as the water inlet and the plug, so as to avoid the installation of the needle-shaped platinum electrode, which is easy to scale and corrode, and needs to be specially designed. The problem of the hole, through the converter valve cooling waterway of the embodiment of the invention, solves the problem that the converter valve module cooling water passage in the existing converter valve cooling water path is easily fouled and corroded by the needle-shaped platinum electrode, and needs to be in the water pipe during installation. Or the problem of perforating the surface of the component.

Claims

A converter valve cooling water passage includes a converter valve module cooling water passage (51), and the converter valve module cooling water passage (51) includes an inlet water main pipe (11), an outlet water main pipe (12), and a cooling element (13). The water inlet main pipe (11) is connected to the water discharge main pipe (12) through a water flow branch and the cooling element (13), and the converter valve module cooling water circuit (51) further includes:

The first voltage equalizing electrode (14) is a three-way conductor connecting member connected to one end of the water inlet main pipe (11) as a water inlet;

a second equalizing electrode (15), which is a plug-type conductor connecting member, is connected to the other end of the water inlet main pipe (11), so that the other end of the water inlet main pipe (11) forms a blind end;

The third voltage equalizing electrode (16) is a plug type conductor connecting member, and is connected to one end of the water discharging main pipe (12), so that one end of the water discharging main pipe (12) forms a blind end;

a fourth voltage equalizing electrode (17) is a three-way conductor connecting member connected to the other end of the water discharging main pipe (12) as a water outlet;

Wherein the first voltage equalizing electrode (14) is equipotentially connected to the third voltage equalizing electrode (16), the second voltage equalizing electrode (15) and the fourth voltage equalizing electrode ( 17) Equipotential bonding.
The converter valve cooling water circuit according to claim 1, wherein said cooling element (13) comprises:

a heat sink (131), a plurality of sets of the heat sinks (131) connected in parallel, each set of the heat sinks (131) comprising at least two heat sinks connected in series, each set of heat sinks (131) and variable current power electronic devices In series, each set of radiators (131) is connected to the water inlet main pipe (11) through a first branch water pipe, and each set of radiators (131) passes through a second branch water pipe and the water discharge main pipe (12) )connection.
The converter valve cooling water circuit according to claim 2, wherein the cooling element (13) further comprises:

A reactor (132) is installed between the water inlet main pipe (11) and the water discharge main pipe (12), and is connected in parallel with a plurality of the heat sinks (131) for protecting the variable current power electronic device.
The converter valve cooling water passage according to claim 2, wherein a plurality of said first branch water pipes are uniformly arranged to connect said water inlet main pipe (11), and said plurality of said second branch water pipes are evenly arranged and connected The water discharge main pipe (12).
The converter valve cooling water circuit according to claim 2, wherein a joint of the first branch water pipe is located below the radiator (131), and a joint of the second branch water pipe is located at the radiator ( Above the 131).
The converter valve cooling water circuit according to claim 1, wherein the top main water pipe of the converter valve cooling water passage is an insulated water pipe (61).
The converter valve cooling water circuit according to claim 6, wherein a plurality of said converter valve module cooling water passages (51) are provided, and each of said converter valve module cooling water passages (51) passes through an interlayer insulating water pipe ( 62) Connection.
The converter valve cooling water circuit according to claim 7, further comprising:

A bypass water pipe (52) is installed at the bottom of the converter valve and connected to the interlayer insulating water pipe (62) for realizing stable flow of the bottom cooling water.
The converter valve cooling water circuit according to claim 8, wherein the bypass water pipe (52) is provided with a wound steel wire.