CN203645559U - Flexible dc power-transmission converter valve tower based on voltage-source current transformers - Google Patents

Abstract

The utility model discloses a flexible direct current transmission converter valve valve tower based on a voltage source converter, which adopts a vertical structure and is integrally supported on the ground; the valve tower includes at least one valve layer, and each valve layer is arranged up and down , configure independent water distribution pipelines; each valve layer includes at least one valve section, the valve sections in each valve layer are arranged in a line, and each valve section includes several flexible direct current transmission Converters are used to complete voltage conversion, and all the converters in the valve tower are connected in series. The valve tower of the converter valve has a compact structure, strong electrical and mechanical properties, and good operation stability.

Description

A Flexible HVDC Converter Valve Valve Tower Based on Voltage Source Converter

technical field

The invention relates to the technical field of power electronics, in particular to a flexible DC power transmission converter valve tower based on a voltage source converter.

Background technique

With the growth of the economy and the continuous improvement of people's living standards, my country's demand for electric energy is getting higher and higher, and the distribution of energy and power reserves in my country is uneven. Therefore, how to efficiently solve the problem of power resource transmission is a major issue in the field of power electronics technology. Hotspots and Difficulties. At present, the most commonly used is AC transmission technology, but due to the resistance loss of wires and the loss of AC inductance, when the line is too long, all the transmitted power will be consumed on the transmission line, so AC transmission cannot be used for too long distance transmission , It has become necessary to vigorously research and develop DC transmission technology.

Thyristor converter valves are commonly used in DC transmission technology, and the valve towers are generally suspended or vertical structures. The suspended valve tower adopts a flexible connection method as a whole, which is mainly connected by the suspension insulator and the rotary hinge. The degree of freedom in the horizontal direction, so the overall operating stability and shock resistance of the valve tower are reduced. When the vertical structure converter valve tower is applied in high-power high-voltage DC transmission, the overall components of the valve tower need to be greatly increased, but the structure is limited, and there are many design difficulties. At the same time, the structure requirements for the converter valve valve hall are greatly improved. It is also relatively inconvenient to install and implement. At the same time, this type of valve tower needs to take overall shielding measures for different valve layers, which will affect the heat dissipation effect of the valve tower to a certain extent. In the design, it is difficult to satisfy electrical performance and mechanical performance at the same time, and the structure is too compact. Installation and maintenance work has brought a lot of inconvenience.

Contents of the invention

In order to overcome the shortcomings of the conventional thyristor converter valve, the present invention provides a valve tower of a flexible direct current transmission converter valve for a voltage source converter.

The technical scheme adopted in the present invention is:

A flexible direct current transmission converter valve valve tower based on a voltage source converter. The valve tower adopts a vertical structure and is integrally supported on the ground; the valve tower includes at least one valve layer, each of which is arranged up and down and configured independently The water distribution pipeline; each of the valve layers includes at least one valve section, the valve sections in each valve layer are arranged in a line, and each of the valve sections includes several flexible direct current transmission converters To complete the voltage conversion, all the converters in the valve tower are connected in series.

Further, the valve tower also includes a power transmission system, which is used to send AC power to each converter of the valve tower, and send DC power converted by each converter out of the valve tower.

Further, the power transmission system includes: a pipe busbar or flexible wire, an AC inlet terminal and a DC outlet terminal on the pipe busbar or flexible wire; the pipe busbar or flexible wire is positioned on the frame of the valve section, according to The valve layers are installed layer by layer; AC power is input from the AC inlet terminal, from bottom to top, each of the converters is connected in series one by one and then output from the DC outlet terminal, or the AC inlet terminal is connected to the DC outlet. The position of the outlet end is interchanged, and the layout method is adopted from top to bottom.

Further, the valve tower also includes a water distribution pipeline for heat dissipation, including a valve section water pipe, a branch water pipe, and a main water pipe; The heat dissipation element of the flow device; when distributing water, it is distributed from bottom to top through the main water pipe to the water pipes of the valve sections of the valve layers to form a circulation; the main water pipe adopts an S shape or a straight line according to the design voltage level The water pipes of the valve section are connected by flanges, and the end faces are sealed; the water pipes of different valve sections of the same valve layer are connected by flanges or joints, and the end faces are sealed or sealed by "O" rings.

Further, the valve tower also includes a signal transmission system for transmitting control signals, including signal transmission slots and signal transmission lines; the signal transmission slots are arranged on both sides of the valve tower; the signal transmission line slots between the valve layers are respectively arranged On the insulating support; the signal transmission line is laid from bottom to top, and distributed to each of the valve layer valve sections through the signal transmission groove.

Further, the water distribution pipeline and/or the signal transmission tank are made of engineering plastics; the main water distribution pipeline and/or the signal transmission tank adopts an S-shaped or inline structure.

Further, the valve tower also includes a shield, which is fixed at both ends of different valve sections and/or between the valve sections through mounting brackets and bolts.

Further, the converter is a voltage source converter such as a multilevel converter, a hybrid multilevel converter, or a two-level cascaded converter.

Further, the entire valve tower is supported on the ground by supporting insulators; the adjacent valve layers are connected by supporting insulators, and the outside is connected by cable-stayed insulators; the valve sections are connected by cable-stayed insulators.

Further, the bottom of the valve section also includes an insulating beam connected to the frame of the valve section, and the converter is installed on the insulating beam through guide rails.

The valve tower provided by the invention has a more flexible structure, is convenient for transportation and on-site assembly, and at the same time facilitates the implementation of different capacities; the electrical performance is relatively stable; and the electrical and mechanical properties of the converter valve are effectively improved.

Description of drawings

Fig. 1 is a schematic front view of a valve tower of the present invention.

Fig. 2 is a right side view of the valve tower of the present invention.

Fig. 3 is a simplified schematic diagram of the rear view of the valve tower of the present invention.

Detailed ways

The valve tower provided by the present invention adopts a vertical structure, is integrally supported on the ground, and includes at least one valve layer, each of which is arranged up and down, equipped with independent water distribution pipelines, and each of the valve layers includes at least one valve section, the valve sections in each valve layer are arranged in a line, and each valve section in the valve tower includes several flexible direct current transmission converters to complete voltage conversion, and all the valve sections in the valve tower The converters are connected in series. The number of valve layers, valve sections and converters in the valve tower can be determined according to different design capacities.

The valve tower also includes an electric transmission system, which is used to send AC power to each converter of the valve tower, and send DC power converted by each converter out of the valve tower. It mainly includes a pipe busbar or flexible conductor, an AC incoming line terminal and a DC outgoing line terminal on the pipe busbar or flexible conductor. The pipe busbar or flexible wire is positioned on the frame of the valve section, and is installed layer by layer according to the number of the valve layers; the AC power is input from the AC inlet terminal, and each converter is connected in series from bottom to top. output from the DC outlet.

The bottom of the valve section may also include an insulating beam connected to the frame of the valve section, and the converter is installed on the insulating beam through guide rails.

The valve tower also includes water distribution pipes for heat dissipation. It mainly includes valve section water pipes, branch water pipes, and main water pipes; the valve section water pipes are provided with water outlet branches, which are connected to the cooling elements of the converter through the branch water pipes; when water is distributed from bottom to top, through the The main water pipe is distributed to the valve section water pipes of each valve layer to form a circulation; the main water pipe adopts an S-shaped or inline structure according to the design voltage level, and is connected to the valve section water pipe by a flange, and the end face is sealed; The water pipes of the same valve layer and different valve sections are connected by flanges or joints, and the end faces are sealed or "O" rings are sealed.

The valve tower also includes a signal transmission system for transmitting control signals. It mainly includes signal transmission slots and signal transmission lines; the signal transmission slots are arranged on both sides of the valve tower; the signal transmission line slots between the valve layers are respectively arranged on insulating supports; The signal transmission slots are allocated to each of the valve layer valve sections.

The water distribution pipeline and/or the signal transmission tank of the valve tower are made of engineering plastics; the main water distribution pipeline and/or the signal transmission tank adopt an S-shaped or inline structure.

The valve tower may also include a shield, which is fixed at both ends of different valve sections and/or between the valve sections through mounting brackets and bolts. When the design voltage is relatively low, the shield can be omitted.

The converters in the valve tower are voltage source converters such as multilevel converters, hybrid multilevel converters, or two-level cascaded converters.

The whole valve tower is supported on the ground by supporting insulators; the adjacent valve layers are connected by supporting insulators, and the outside is connected by cable-stayed insulators; the valve sections are connected by cable-stayed insulators.

The present invention will be further described below in conjunction with the accompanying drawings. As shown in Figure 1~3, in the figure: 1. valve layer; 2. shielding cover; 3. post insulator 1; 4. valve section; 5. valve section water pipe; 6. branch water pipe; 7. valve section signal transmission line Slot; 8. Valve section frame; 9. Converter; 10. Connecting copper bar; 11. Installation guide rail; 12. Insulation bracket; 13. Insulation beam; 14. Cable-stayed insulator; 16. Post insulator 2; 17. Water distribution pipeline; 18. Main water pipe; 19. Signal transmission main trunking; 20. Pipe busbar (or soft wire); 21. Post insulator 3; outlet end.

The valve tower of the diverter valve proposed by the present invention mainly includes at least one valve layer, an electrical transmission system, a signal transmission system, a water distribution system and a support system for connection.

The valve tower adopts a vertical structure. The whole valve tower is supported on the ground by supporting insulators. The upper and lower valve layers are arranged at intervals. The adjacent valve layers are connected by supporting insulators, and the outside is connected by cable-stayed insulators. Distributed at the left and right ends of the valve tower, distributed to each valve layer one by one from bottom to top, using voltage source converters, distributed in different valve sections of different valve layers, the AC input and the DC output converted by the converter are equal It is done through pipe busbars or flexible wires.

Each valve layer includes multiple valve sections (4). Preferably, more than three valve sections are used, and the valve sections on the same layer are arranged in a line. The valve section connects the terminal converter and the first converter of the adjacent valve section through the copper bar, forming a series connection. The valve layers are connected by post insulator one (3) and fastened by bolts.

In each valve section, several converters (9) are used to complete voltage conversion. Each valve section mainly includes valve section water pipes (5), valve section signal transmission line slots (7), valve section frame (8), several converters (9), connecting copper bars (10), and insulating brackets 12. It may also include mounting rails (11) and insulating beams (13). The converters can be multi-level converters, hybrid multi-level converters, two-level cascaded converters and the like. Among them, the connecting copper bar is used to connect the converter to form a series structure and install an insulating bracket on the frame of the valve section, which is fastened by bolts. The water pipes in the valve section and the transmission line groove between the valve layers are respectively arranged on the insulating support. A mounting hole is provided at the bottom of the valve section signal transmission line groove 7, which is fastened and positioned by bolts. According to the number of actual design requirements, a corresponding number of water outlet branches are provided on the water pipes of the valve section, and are connected to the cooling elements of the converter through the branch water pipes.

In addition, the valve section can also include an insulating crossbeam, which is connected to the left and right sides of the valve section frame by bolts, and the converter can be installed on the insulating crossbeam at the bottom of the valve section through guide rails. The dedicated installation guide rail makes the converter flexible, detachable, easy to install, and stable and reliable in operation. The material of the insulating beam can be epoxy material.

The electrical transmission system mainly includes a pipe busbar (or flexible wire) (20), an AC incoming terminal (22) and a DC outgoing wire terminal (23) on the pipe busbar (or flexible wire). The pipe busbar (or soft wire) is positioned on the valve section frame (8) through the post insulator three (21), and installed layer by layer according to the number of valve layers. Input at the incoming line terminal, from bottom to top, pass through each valve section converter (9) and each pipe busbar (or soft wire) one by one, and then output from the DC outgoing line terminal. The positions of the AC incoming line section 22 and the DC outgoing line end 23 are interchangeable. After the AC incoming line is connected through the bottom or top pipe busbar (or soft wire), each converter of the valve layer and the upper pipe busbar (or soft wire) are connected in series in series until the last converter of the valve group on the uppermost layer of the valve tower. connected to the DC outlet after the device.

The signal transmission system mainly includes: signal transmission line, signal transmission main line groove (19), signal transmission groove between valve layers (15), valve section signal transmission line groove (7). The inter-valve signal transmission line slots are arranged on both sides of the converter valve tower. There are installation holes at the bottom of the signal transmission line slot (7) of the valve section, and the bolts are used for fastening and positioning. The signal transmission line slots (15) between the valve layers are respectively arranged on the insulating brackets (12). The signal transmission line is laid from bottom to top, and is distributed to the signal transmission line slots of each valve layer and valve section through the signal transmission main line slot. The signal transmission line groove is preferably made of engineering plastics with strong mechanical properties, high flame-retardant grades, and excellent electrical properties.

The water distribution system mainly includes: valve section water pipes (5), branch water pipes (6), water distribution pipelines (17), and main water pipes (18). According to the number of actual design requirements, a corresponding number of water outlet branches are provided on the water pipes of the valve section, and are connected to the cooling elements of the converter through the branch water pipes. The water distribution is from bottom to top, and distributed to the water pipes of each valve layer and valve section through the main water pipe to form a cycle. The main water pipe adopts S-shaped or straight-shaped structure according to the design voltage level, and is connected with the water pipe of the valve section by flange, and the end face is sealed. The water pipes of different valve sections on the same floor are connected by flanges or joints, and the end faces are sealed or "O" rings are sealed. It is preferred to use any joint connection to improve the sealing of the contact end surface. The water distribution pipeline is preferably made of engineering plastics with strong mechanical properties, high flame retardant grades, and excellent electrical properties. The main water distribution pipeline and signal transmission main line groove adopt an S-shaped or inline structure, and an S-shaped structure is recommended for high voltage levels.

The support system that plays a connecting role includes all kinds of frames, supports, pillars, beams, connecting copper bars, cable-stayed insulators, etc. mentioned above. For example, bolts are used to fasten the support and the ground of the valve hall after the valve layer is connected to the post insulator 216. The valve layers and valve sections of the converter valve are connected by cable-stayed insulators (14) to enhance their mechanical and electrical properties.

In addition, for the valve tower of the present invention, when the design voltage is relatively high, a shielding cover (2) may also be included. The shielding cover is fixed at both ends of different valve sections and between the valve sections through mounting brackets and bolts to ensure that there is no tip discharge phenomenon during the operation of the converter valve. When the design voltage is relatively low, the shielding cover can be omitted.

The above display only describes the main features and inventive points of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. On the premise of not departing from the point and scope of protection of the invention, there will be various changes in the present invention, and these changes and improvements will all fall within the scope of protection claimed in the present invention.

Claims (10)

1. the flexible DC power transmission converter valve tower based on voltage source converter, is characterized in that, described valve tower adopts vertical structure, and integrated support is in ground; Described valve tower comprises at least one valve layer, and each described valve layer is arranged above and below, and configures independently water distribution pipeline; Each described valve layer comprises at least one valve section, the described valve section word order in described each valve layer, and described each valve section comprises that several flexible DC power transmission current transformers have been used for voltage transitions, all described current transformer series connection in described valve tower.

2. valve tower as claimed in claim 1, is characterized in that, also comprises electric energy transmission system, for alternating current being sent into the each described current transformer of described valve tower, and the direct current after described each current transformer conversion is sent to described valve tower.

3. valve tower as claimed in claim 2, is characterized in that, described electric energy transmission system comprises: interchange end of incoming cables, direct current leading-out terminal on pipe bus or flexible conductor, described pipe bus or flexible conductor; Described pipe bus or flexible conductor are positioned on the framework of described valve section, successively install according to described valve layer; Alternating current is inputted by described interchange end of incoming cables, from bottom to top, connects one by one and after current transformer, is exported by described direct current leading-out terminal described in each; Or, by described interchange end of incoming cables and described direct current leading-out terminal location swap, adopt arrangement from top to bottom.

4. valve tower as claimed in claim 1, is characterized in that, described water distribution pipeline, for heat radiation, comprises valve section water pipe, branch road water pipe, water main; On described valve section water pipe, offer water outlet branch road, be connected to the heat dissipation element of described current transformer by described branch road water pipe; When water distribution, from bottom to top, in described water main is dispensed to the described valve section water pipe of described each valve layer, form circulation; Described water main adopts S shape or in-line structure according to design voltage grade, adopts flange to be connected, end face seal with described valve section water pipe; Between the water pipe with the different valve section of valve layer, adopt flange or connected by a joint, end face seal or the sealing of " O " shape sealing ring.

5. valve tower as claimed in claim 4, is characterized in that, also comprises signal transmission system, for transmission of control signals, comprises signal transmission slot and signal transmssion line; Described signal transmission slot is arranged in described valve tower both sides; The signal transmssion line groove of described valve interlayer is arranged on insulating support; Described signal transmssion line from bottom to top lays, in described signal transmission slot is dispensed to each described valve layer valve section.

6. the valve tower as described in claim 4 or 5, is characterized in that, described water distribution pipeline and/or described signal transmission slot adopt engineering plastics; Water distribution main line and/or described signal transmission slot adopt S shape or yi word pattern structure according to design voltage grade.

7. valve tower as claimed in claim 1, is characterized in that, also comprises radome, by mounting bracket and be bolted between different described valve section two ends and/or described valve section.

8. valve tower as claimed in claim 1, is characterized in that, described current transformer is many level current transformers, mixed multi-level current transformer, or two level cascade converters.

9. valve tower as claimed in claim 1, is characterized in that, described valve tower entirety is supported in ground by supporting insulator; Between adjacent described valve layer, supporting insulator is connected, outside connected by oblique pull insulator; Between described valve section, use oblique pull insulator to be connected.

10. valve tower as claimed in claim 1, is characterized in that, described valve section bottom also comprises and insulation crossbeam be connected with valve segment frames, described current transformer by guide rails assembling on described insulation crossbeam.

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