CN218386235U - Multiport high-voltage direct-current breaker valve tower - Google Patents

Abstract

The utility model discloses a multi-port high-voltage DC circuit breaker valve tower, a plurality of independent switch valve towers and an auxiliary branch valve tower, wherein the plurality of switch valve towers are arranged on one side of the auxiliary branch valve tower, and each switch The valve tower is connected to a DC pole line, and multiple switching valve towers are connected to the auxiliary branch valve tower through the confluence busbar. The potential natural isolation between the valve towers is guaranteed through independent arrangement; the valve towers can be flexibly connected through the confluence busbar. Through this valve tower design, the adaptability of the product can be greatly improved, and the floor area and cost can be reduced. , adopts multiple independent multi-layer valve tower interconnection design, can flexibly expand the number and number of layers of switch towers, and can also flexibly expand the number and number of layers of auxiliary branch towers.

Description

A multi-port HVDC circuit breaker valve tower

technical field

The utility model relates to the field of flexible direct current transmission and a direct current power grid, in particular to a multi-port high-voltage direct current circuit breaker valve tower.

Background technique

As the core equipment for constructing multi-section DC and DC power grids, high-voltage DC circuit breakers are used in large quantities and cost high, and are one of the important directions for cost reduction of key equipment in DC power grids. At present, the technical scheme adopted by most high-voltage DC circuit breakers is a hybrid scheme, which consists of main branch, auxiliary branch and energy consumption branch. The main branch is usually composed of fast mechanical switches with low loss, which are used to conduct the system current for a long time; the auxiliary branch is usually composed of cascaded power electronic power units, which are used to withstand the system fault current in the short term and provide the main branch with Time for zero-current breaking and establishing voltage isolation capability; energy-dissipating branches are usually composed of non-linear resistors and other energy-dissipating components, which are used to establish reverse voltage, clear fault current, and consume system fault energy.

Currently, a circuit breaker is usually configured at both ends of each pole line. Such a configuration scheme will lead to a substantial increase in the number of circuit breakers due to the increase in the number of DC power grid locations, which has the advantages of large footprint and high cost. Shortcomings.

Utility model content

Therefore, in order to overcome the shortcomings of the existing high-voltage DC circuit breaker configuration schemes, which occupy a large area and have high cost, the utility model provides a multi-port high-voltage DC circuit breaker valve tower, which realizes the miniaturization and low-cost costing.

In order to achieve the above object, the utility model provides the following technical solutions:

The utility model provides a multi-port high-voltage direct current circuit breaker valve tower, comprising: a plurality of independent switching valve towers and an auxiliary branch valve tower, wherein a plurality of switching valve towers are arranged on one side of the auxiliary branch valve tower , each switching valve tower is connected to a DC pole line, and multiple switching valve towers are connected to auxiliary branch valve towers through a confluence busbar.

In one embodiment, the switch valve tower includes a main branch assembly and an isolation branch assembly, the auxiliary branch valve tower includes an auxiliary branch assembly and an energy consumption branch assembly, and the inlet terminal of the auxiliary branch valve tower It is connected with the main branch circuit element in the switch valve tower, and the outlet terminal of the auxiliary branch valve tower is connected with the isolated branch circuit component in the switch valve tower.

In one embodiment, the switch valve tower includes: a main branch fast mechanical switch group, a main branch semiconductor component, and an isolation branch fast mechanical switch group, wherein the main branch mechanical switch group is installed and arranged at the lower part of the switch valve tower , consisting of multi-level switches connected in series, the switches of each level in series are powered by interlayer isolation transformers, the semiconductor components of the main branch are arranged in the middle of the switch valve tower, and the energy is supplied by the interlayer isolation transformer, and the fast mechanical switch group of the isolation branch is arranged in The upper part of the switching valve tower is powered by the interlayer isolation transformer.

In an embodiment, the switch valve tower further includes: an isolation branch semiconductor component, which is arranged in the middle of the switch valve tower together with the main branch semiconductor component.

In one embodiment, the auxiliary branch valve tower is arranged in layers of sub-units, each layer is a module of the same voltage level, and each layer is connected in parallel with a group of energy-consuming branch components.

In an embodiment, both the switching valve tower and the auxiliary branch valve tower provide energy required for work through an external energy supply, and the components of the energy supply group are integrated and arranged inside each valve tower.

The technical scheme of the utility model has the following advantages:

1. The multi-port high-voltage DC circuit breaker valve tower proposed by the utility model includes a plurality of independent switch valve towers and an auxiliary branch valve tower, wherein a plurality of switch valve towers are arranged on one side of the auxiliary branch valve tower, and each switch The valve tower is connected to a DC pole line, and multiple switching valve towers are connected to the auxiliary branch valve towers through the confluence busbar. The potential natural isolation between the valve towers is guaranteed through independent arrangement; the valve towers can be flexibly connected through the confluence busbar. Through this valve tower design, the adaptability of the product can be greatly improved, and the floor area and cost can be reduced. .

2. The multi-port HVDC circuit breaker valve tower proposed by this utility model adopts the interconnected design of multiple independent multi-layer valve towers, which can flexibly expand the number of switch towers and the number of layers, and can also flexibly expand the number of auxiliary branch towers and layers.

3. In the valve tower of the multi-port high-voltage DC circuit breaker proposed by the utility model, the switch valve tower is arranged in the middle of the semiconductor unit, which realizes the parallel potential layout of the switch tower.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is an example diagram of a valve tower of a multi-port high-voltage DC circuit breaker provided in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the position of the incoming and outgoing line terminals of the switch tower of the multi-port high-voltage direct current circuit breaker provided in the embodiment of the utility model;

Fig. 3 is a schematic diagram of the layout of each port of the valve tower of the multi-port high-voltage DC circuit breaker provided in the embodiment of the utility model;

Fig. 4 is a typical circuit topology of the multi-port circuit breaker provided in the embodiment of the present invention.

Reference signs:

1-Switch valve tower; 2-Auxiliary branch valve tower; 3-Main branch fast mechanical switch group; 4-Main branch semiconductor components; 5-Isolation branch fast mechanical switch group; 6-Energy consumption branch.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

Example

A multi-port high-voltage DC circuit breaker valve tower provided by the utility model, as shown in Figure 1, includes: a plurality of independent switching valve towers 1 and an auxiliary branch valve tower 2, wherein a plurality of switching valve towers 1 are arranged on On one side of the auxiliary branch valve tower 2, each switching valve tower 1 is connected to a DC pole line, and multiple switching valve towers are connected to the auxiliary branch valve tower 2 through a busbar.

The valve towers in the embodiment of the utility model are independently arranged to ensure the natural isolation of the potential between the valve towers; the valve towers can be flexibly connected through the confluence busbar, and the design of the valve towers can greatly improve the adaptability of the product. performance, and reduce floor space and cost. By sharing a group of auxiliary branch valve towers with multiple ports, the occupied area can be reduced by at least 30%, the number of semiconductor units used in the auxiliary branch can be reduced, and the equipment cost can be reduced by at least 40%. As the number of ports increases, the effect of reducing the floor space and cost will be more obvious.

In the embodiment of the utility model, the switch valve tower includes the main branch assembly and the isolation branch assembly, the auxiliary branch valve tower includes the auxiliary branch assembly and the energy consumption branch assembly, the inlet terminal of the auxiliary branch valve tower and the The main branch circuit element in the switching valve tower is connected, and the outlet terminal of the auxiliary branch valve tower is connected with the isolation branch circuit component in the switching valve tower.

Specifically, as shown in Figure 2, the switching valve tower of the multi-port HVDC circuit breaker is composed of a multi-layer structure. The switching valve tower includes: the main branch fast mechanical switch group 3, the main branch semiconductor component 4, the isolation branch fast The mechanical switch group 5, in which the main branch mechanical switch group 3 is installed and arranged at the lower part of the switch valve tower, is because the frequency of action of the main branch is higher than that of the isolation branch. It is composed of multi-stage switches in series, and the switches of each level in series are supplied with energy through the interlayer isolation transformer; the main branch semiconductor component 4 is arranged in the middle of the switch valve tower. If the isolation branch also needs semiconductor components, the isolation branch semiconductor component and The semiconductor components of the main branch are arranged in the middle of the switch tower together. This arrangement is more conducive to the overall potential distribution of the switch valve tower and realizes the forward potential layout of the switch valve tower. It is powered by the interlayer isolation transformer; due to the action of the isolation branch The frequency is not high, so the frequency of inspection and maintenance is lower than that of the main branch. The fast mechanical switch group 5 of the isolated branch is arranged on the upper part of the valve tower, and is powered by the interlayer isolation transformer. There are other special needs in actual engineering, and the positions of the main branch switch group and the isolation branch switch group can be flexibly adjusted. The multi-layer structure of the switching valve tower can be flexibly expanded according to the needs of the actual voltage level.

As shown in Figure 3, the incoming and outgoing lines of the multi-port HVDC circuit breaker are all in the switch valve tower, and there are three wiring terminals in total. Among them, the A terminal corresponds to the busbar in the converter station, and the B terminal corresponds to the auxiliary branch incoming line terminal. , and the C terminal is correspondingly connected to each incoming line port of the converter station. Each inlet port of the converter station is connected to the circuit breaker through the switching valve tower. In practical applications, the switching valve tower can be flexibly expanded according to the number of ports in the converter station. The switching valve towers are connected through the busbar and connected to the Auxiliary branch valve tower. Sufficient insulation gaps are maintained between multiple switch towers to ensure the safety of insulation between poles. Through this valve tower design, the adaptability of the product can be greatly improved, and the floor space and cost can be reduced.

In the embodiment of the utility model, as shown in FIG. 3 , the auxiliary branch valve tower adopts a layered arrangement of units, each layer is a module of the same voltage level, and each layer is connected in parallel with a group of components of the energy consumption branch 6 . The auxiliary branch valve tower can be flexibly expanded and configured according to the voltage level of the DC system, and the parallel energy-consuming branch components can also be flexibly expanded according to the system energy. As shown in Figure 4, it is one of the typical topologies of multi-port HVDC circuit breakers, but is not limited to this topology. It is a schematic diagram of the wiring of a converter station in a typical multi-terminal DC or DC grid system. The DC of the converter valve is simultaneously connected to multiple DC pole lines (DC pole lines 1/2/3 in Fig. 4), the main branch of the multi-port HVDC circuit breaker is connected in series in the DC pole line, and after the auxiliary branch is connected in parallel with the energy consumption branch, it is respectively connected to the three The other end of the auxiliary branch is connected to three isolated branches, and the other end of the isolated branch is connected to its corresponding main branch. The structural design form of the valve tower in the embodiment of the utility model can be popularized and applied to any hybrid multi-port high-voltage DC circuit breaker topology.

In the embodiment of the utility model, both the switch valve tower and the auxiliary branch valve tower provide energy required for work through an external energy supply mode, and the components of the energy supply group are integrated and arranged inside each valve tower.

The multi-port high-voltage DC circuit breaker valve tower provided by the embodiment of the utility model adopts the interconnected design of multiple independent multi-layer valve towers, which can greatly improve the adaptability of the product, reduce the floor area and cost, and flexibly expand the switch valve The number of towers and layers, and the number and layers of auxiliary branch valve towers can also be flexibly expanded. The independent switching valve towers and auxiliary branch valve towers can be designed as standardized modules, which can be flexible according to the number of engineering ports, voltage levels and capacities. Adjustment.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the scope of protection of the utility model.

Claims (6)

1. A multi-port high voltage dc circuit breaker valve tower, comprising: the device comprises a plurality of independent switch valve towers and an auxiliary branch valve tower, wherein the plurality of switch valve towers are arranged on one side of the auxiliary branch valve tower, each switch valve tower is connected with a direct current pole line, and the plurality of switch valve towers are connected with the auxiliary branch valve tower through a bus bar.

2. The multi-port high voltage direct current breaker valve tower of claim 1, wherein the switching valve tower comprises a main branch assembly and an isolation branch assembly, the auxiliary branch valve tower comprises an auxiliary branch assembly and an energy-consuming branch assembly, an incoming terminal of the auxiliary branch valve tower is connected with a main branch element in the switching valve tower, and an outgoing terminal of the auxiliary branch valve tower is connected with the isolation branch element in the switching valve tower.

3. The multi-port high voltage direct current circuit breaker valve tower of claim 2, wherein the switch valve tower comprises: the quick mechanical switch group of main branch road, main branch road semiconductor module, the quick mechanical switch group of isolation branch road, wherein the installation of main branch road mechanical switch group is arranged in the lower part of switch valve tower, establish ties by the multi-stage switch and constitute, the switch of establishing ties is through the energy supply of isolation transformer between layer at each level, main branch road semiconductor module arranges in the middle part of switch valve tower, by the energy supply of isolation transformer between layer, the quick mechanical switch group of isolation branch road is arranged in switch valve tower upper portion, by the energy supply of isolation transformer between layer.

4. The multi-port high voltage direct current circuit breaker valve tower of claim 3, further comprising: and the isolation branch semiconductor assembly and the main branch semiconductor assembly are arranged in the middle of the switch valve tower.

5. The multi-port high voltage direct current breaker valve tower of claim 2, wherein the auxiliary branch valve tower is in a split-unit layered arrangement, each layer is a module of the same voltage class, and each layer is connected in parallel with elements of a group of energy consuming branches.

6. The multi-port high voltage direct current breaker valve tower of claim 1, wherein the switch valve tower and the auxiliary branch valve tower both provide energy required for operation through external energy supply, and the energy supply component is integrally arranged inside each valve tower.

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