CN208062796U - Alternating current filter structure for current conversion station - Google Patents

Abstract

The utility model relates to an AC filter structure used in a converter station, which adopts an optimized "field-shaped" layout scheme, a large group of incoming lines through a high-span incoming line, the height of the hanging point is 33 meters, and is led downward to The busbar of the group, the height of the hanging point of the busbar of the group is 26 meters, and it is connected downward to the isolating switch of the opposite group to complete the connection between the groups. Each large group is provided with a high span at the incoming line position, which greatly reduces the distance between the upper and lower floors. The number of intersections of the busbars, while optimizing at the intersection locations. By setting the above-mentioned AC filter structure, the problem of live hoisting of the circuit breaker is effectively solved, a series of problems caused by the full stop of the large group are avoided, and installation, operation and maintenance are facilitated. Reduced the number of frames and saved costs.

Description

AC filter structure for converter station

technical field

The utility model relates to the technical field of power transmission and distribution, in particular to an AC filter structure used in a converter station.

Background technique

With the improvement of people's living standards, the demand for electricity is getting higher and higher, and many cities with large electricity consumption do not have power plants, and the electricity used in these places is transmitted from other places through high-voltage long-distance transmission. The line loss of alternating current is larger than that of direct current when long distance high voltage transmission. Therefore, direct current is used in some long-distance high-voltage transmission. Since the power generated by the power station is all alternating current, it is necessary to first convert the alternating current generated by the power station into direct current through the converter station.

The converter station includes converters, converter transformers, smoothing reactors, AC filters, DC filters and control and protection equipment. Among them, the AC filter as an important part of the converter station mainly plays the role of providing reactive power and filtering AC harmonics.

However, in the existing converter station, the large-group incoming line of the AC filter adopts a high-altitude jumper, and the filter group connection adopts a suspended tube bus. When the group's equipment fails, a large group of power outages is required, and the power outage range is large.

Utility model content

Based on this, it is necessary to provide an AC filter structure for a converter station that is convenient for equipment installation, repair, operation and maintenance in order to solve the problem of inconvenient equipment maintenance and hoisting in the existing converter station.

An AC filter structure for a converter station, comprising:

at least one first large group and at least one second large group, the first large group includes at least one capacitor group and at least one filter group, the second large group includes at least one capacitor group and at least one filter group;

Each of the first large groups is adjacent to a corresponding second large group, and the number of the capacitor groups of the first large group is the same as the number of the adjacent filter groups of the second large group The number is the same, and the number of the filter group of the first large group is the same as the number of the capacitor group adjacent to the second large group;

The AC filter structure also includes a plurality of large groups of incoming lines, a plurality of inter-group connections, a plurality of sub-group buses, between the plurality of capacitor groups of the first large group and the plurality of filter groups A plurality of the large group incoming lines are connected between them, and the capacitor group of the first large group is connected to the filter group of the first large group and the large group incoming lines through a plurality of the small group buses ;

The plurality of filter subgroups of the second large group are connected to the large group incoming lines, and the filter subgroups of the second large group are connected to the large group incoming lines through the subgroup busbars. line, the capacitor group and the filter group of the second largest group are connected through a plurality of inter-group connections;

The capacitor group of the first large group and the filter group of the second large group are connected through the large group of incoming lines.

By using the above-mentioned AC filter structure, through reasonable optimization of the combination in the large group, the number of layers of the frame is reduced, the amount of steel is reduced, and the cost of the structure is reduced. Moreover, when one of the small groups fails, the entire large group does not need to be powered off Reprocessing makes maintenance more convenient.

In one of the embodiments, the capacitor group includes a low-voltage reactive power compensation unit and a high-voltage incoming power distribution unit, one end of the high-voltage incoming power distribution unit is electrically connected to the low-voltage reactive power compensation unit, and the other end is electrically connected to the low-voltage reactive power compensation unit. electrical connections to the filter group described above.

In one of the embodiments, the filter group includes a low-voltage filter unit and the high-voltage incoming power distribution unit, one end of the high-voltage incoming power distribution unit of the filter group is electrically connected to the low-voltage filter unit, and the other One end is electrically connected to the high-voltage incoming power distribution unit of the capacitor group.

In one of the embodiments, the structure of the AC filter further includes a down-lead wire, one end of the down-lead wire is electrically connected to the large group of incoming lines, and the other end is electrically connected to the small group of busbars, and is used to electrically connect the Describe the large group incoming line and small group bus.

In one of the embodiments, the AC filter structure further includes a combined frame, and the combined frame is arranged on the peripheral side of the high-voltage incoming line power distribution unit of the first large group and on the side of the second large group. The peripheral side of the high-voltage incoming line power distribution unit of the filter group is used to overhead the large group of incoming lines and the small group bus.

In one of the embodiments, the overhead height of the large group incoming lines is 33 meters, and the overhead height of the small group busbars is 26 meters.

In one of the embodiments, the AC filter structure further includes a tension insulator string, and both ends of the tension insulator string are connected to the joint frame.

In one of the embodiments, the structure of the AC filter further includes a string of suspension insulators, the string of suspension insulators is arranged on the joint frame, and is used to suspend the electrical connection between the busbar of the small group and the power distribution unit of the high-voltage incoming line. soft wire.

In one of the embodiments, the high-voltage incoming power distribution unit includes three sets of incoming power distribution components, the low-voltage reactive power compensation unit is three capacitor banks connected in parallel, and is connected with the three sets of incoming power distribution components correspond;

The low-voltage filtering unit is three sets of AC filters electrically connected, and corresponds to the three sets of incoming power distribution components.

In one of the embodiments, the incoming power distribution assembly includes a grounding switch, a current transformer, a circuit breaker, and an isolating switch that are electrically connected in sequence, and the low-voltage reactive power compensation unit and the low-voltage filter unit are electrically connected to the grounding switch.

Description of drawings

Fig. 1 is a schematic diagram of the structure of an AC filter used in a converter station provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a cross-sectional structure at A-A of the AC filter structure shown in FIG. 1;

FIG. 3 is a schematic diagram of a cross-sectional structure at B-B of the AC filter structure shown in FIG. 1 .

Detailed ways

In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present utility model are provided in the accompanying drawings. However, the invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present utility model more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in Figure 1, an AC filter structure 10 for a converter station provided by an embodiment of the present invention includes at least one first large group 12, at least one second large group 14, and multiple large group incoming lines 16. A plurality of inter-subgroup connection lines 18 and a plurality of subgroup busbars 11 . The first large group 12 includes at least one capacitor group 13 and at least one filter group 15 , and the second large group 14 includes at least one capacitor group 13 and at least one filter group 15 .

Each first large group 12 is adjacent to a corresponding second large group 14, and the quantity of the capacitor group 13 of the first large group 12 in the adjacent two is the same as that of the filter group 15 of the second large group 14 The numbers are the same, the number of filter subgroups 15 of the first large group 12 is the same as the number of capacitive subgroups 13 of the second large group 14 .

A plurality of large group incoming lines 16 are connected between a plurality of capacitor groups 13 of the first large group 12 and a plurality of filter groups 15, and the capacitor groups 13 of the first large group 12 are connected to the first large group through a plurality of group buses 11. The filter group 15 of the group 12 and the incoming line 16 of the large group.

A plurality of filter groups 15 of the second large group 14 are connected with a large group of incoming lines 16, and the filter groups 15 of the second large group 14 are connected to the large group of incoming lines 16 through the small group bus 11, and the second large group 14 The capacitor group 13 and the filter group 15 are connected through a plurality of small component connections 18 .

By using the above-mentioned AC filter structure 10, through reasonable optimization of the combination in the large group, the number of layers of the frame and the occupied area are reduced, the amount of steel is reduced, and the cost of the structure is reduced. In addition, when one of the groups fails, the entire The large group will deal with it after a power outage, making maintenance more convenient.

In one embodiment, the capacitor group 13 includes a low-voltage reactive power compensation unit 132 and a high-voltage incoming power distribution unit 17. One end of the high-voltage incoming power distribution unit 17 is electrically connected to the low-voltage reactive power compensation unit 132, and the other end is connected to the filter group. 15 electrical connection. Further, the filter group 15 includes a low-voltage filter unit 152 and a high-voltage incoming power distribution unit 17, one end of the high-voltage incoming power distribution unit 17 of the filter group 15 is electrically connected to the low-voltage filter unit 152, and the other end is connected to the high voltage of the capacitor group 13. The incoming power distribution unit 17 is electrically connected. In this way, the electrical connection between the capacitor group 13 and the filter group 15 is realized.

In one embodiment, the AC filter structure 10 further includes a joint frame 19, and the joint frame 19 is arranged on the peripheral side of the high-voltage incoming power distribution unit 17 of the first large group 12 and on the side of the filter group 15 of the second large group 14. The peripheral side of the high-voltage incoming power distribution unit 17 is used for overhead large group incoming lines 16 and small group busbars 11 . It should be noted that the joint frame 19 is used for the overhead group incoming line 16 and the group busbar 11, therefore, the joint frame 19 along the arrangement direction of the first large group 12 and the second large group 14 is used for the overhead group busbar, only need Set at both ends of the high-voltage incoming line power distribution unit 17 with the small group busbar 11, the joint frame 19 along the direction of the capacitor group 13 towards the filter group 15 is used to overhead the large group incoming line 16, and is set where there is a large group incoming line 16 The two ends of the high-voltage incoming line power distribution unit 17. Further, the overhead height of the large group incoming line 16 is 33 meters, and the overhead height of the small group busbar 11 is 26 meters. Specifically in the embodiment, the AC filter structure 10 also includes a down conductor 20, one end of the down conductor 20 is electrically connected to the large group incoming line 16, and the other end is electrically connected to the small group bus bar 11 for electrically connecting the large group incoming line 16 and group bus 11.

In one embodiment, the AC filter structure 10 further includes a tension insulator string 21 , and both ends of the tension insulator string 21 are connected to the joint frame 19 for insulatingly suspending the group bus 11 at a height of 26 meters. Further, the AC filter structure 10 also includes a suspension insulator string 22, the suspension insulator string 22 is arranged on the joint frame 19, and hangs on the joint frame 19 in the vertical direction, and is used to suspend and make the small group bus 11 and the high voltage incoming line power distribution The flexible wires (not shown) electrically connected to the unit 17. Specifically in the implementation, the two ends of the group bus 11 are provided with tension insulator strings 21, which are used to pull the group bus 11 up and hang at a height of 26 meters, and the suspension insulator strings 22 are arranged between the group bus 11 and the high-voltage incoming line. One end of the electrical connection of the power distribution unit 17 . It can be understood that the provision of the tension insulator string 21 and the suspension insulator string 22 is to prevent the electric connection between the line and the combined frame 19 from making the combined frame 19 electrified.

In one embodiment, the high-voltage incoming power distribution unit 17 includes three groups of incoming power distribution components (not shown), the low-voltage reactive power compensation unit 132 is three parallel capacitor banks (not shown), and is connected with the three groups Corresponding to incoming power distribution components. Further, the low-voltage filtering unit 152 is three sets of AC filters (not shown in the figure) electrically connected, and corresponds to the incoming power distribution components in the three sets of filter groups 15 . Specifically in the embodiment, the incoming power distribution assembly includes a grounding switch (not shown), a current transformer (not shown), a circuit breaker (not shown) and a disconnector (not shown), which are electrically connected in sequence. The reactive power compensation unit 132 and the low voltage filter unit 152 are electrically connected to the grounding switch.

In order to facilitate the understanding of the technical solution of the present invention, the following is a specific embodiment to illustrate the specific layout of the AC filter structure 10:

Based on FIG. 1 , the total length of the left and right ends of the AC filter structure 10 is 128 meters. The low-voltage reactive power compensation unit 132 occupies an area of 27 meters in length. The distance between the grounding switch and the low-voltage reactive power compensation unit 132 is 2 meters. The distance between the current transformer and the grounding switch is 4 meters. The distance between the circuit breaker and the current transformer is 6.5 meters. The distance between the circuit breakers is 10 meters, and the distance between the circuit breakers in the capacitor group 13 and the isolating switch in the filter group 15 is 16 meters. The distance between other components in the incoming power distribution assembly of the filter group 15 is the same as in the capacitor group 13 . The distance between the grounding switch in the filter group 15 and the low-voltage filter unit 152 is 2 meters, and the left and right length of the low-voltage filter unit 152 is 40 meters.

The total length of the joint frame 19 in the left and right directions of the first large group 12 is 53 meters, the first large group incoming line 16 on the left side is 6 meters away from the left edge of the joint frame 19, and the distance between the large group incoming lines 16 is 6.5 meters. The first large group incoming line 16 on the right side above the capacitance group 13 of the first large group 12 is 9 meters away from the joint frame 19 that is suspended with the suspension insulator string 22. Above the filter group 15 of the first large group 12, the first large group incoming line 16 on the left side is 6 meters away from the joint frame 19 that is suspended with a suspension insulator string 22, and the distance between the large group incoming lines 16 is the same. The first large group incoming line 16 is 6 meters away from the right side edge of the joint frame 19.

The distance between the low-voltage reactive power compensation units 132 in the up and down direction is 4 meters, and the distance between the low-voltage filtering units 152 is 1.5 meters.

Compared with the prior art, the AC filter structure used in the converter station provided by the utility model has at least the following advantages:

1) A new layout is proposed, the layout is optimized, and the land occupation is saved;

2) The low-span group bus uses 26-meter-high flexible wires, which effectively solves the problem of live hoisting of circuit breakers, avoids problems in small groups, and a series of problems caused by complete shutdown of large groups, greatly reducing the scope of power outages and facilitating installation , operation and maintenance;

3) Under the condition of meeting the requirements of air clearance, optimize the distance between equipment and improve the safety factor of operation;

4) The large group of incoming lines adopts the method of staggered down-leading, which reduces the number of frames and reduces the cost;

5) Increase the hanging points of the tension insulator strings to realize jumping between groups and reduce wire crossing.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. An AC filter structure for a converter station, comprising: at least one first large group and at least one second large group, the first large group includes at least one capacitor group and at least one filter group, the second large group includes at least one capacitor group and at least one filter group; It is characterized in that each of the first large groups is adjacent to a corresponding second large group, and the number of the capacitance small groups of the first large group is the same as that of the adjacent second large group. The number of filter groups is the same, and the number of the filter groups in the first large group is the same as the number of adjacent capacitor groups in the second large group; The AC filter structure also includes a plurality of large groups of incoming lines, a plurality of inter-group connections, a plurality of sub-group buses, between the plurality of capacitor groups of the first large group and the plurality of filter groups A plurality of the large group incoming lines are connected between them, and the capacitor group of the first large group is connected to the filter group of the first large group and the large group incoming lines through a plurality of the small group buses ; The plurality of filter subgroups of the second large group are connected to the large group incoming lines, and the filter subgroups of the second large group are connected to the large group incoming lines through the subgroup busbars. line, the capacitor group and the filter group of the second largest group are connected through a plurality of inter-group connections; The capacitor group of the first large group and the filter group of the second large group are connected through the large group of incoming lines. 2. The AC filter structure for a converter station according to claim 1, wherein the capacitor group includes a low-voltage reactive power compensation unit and a high-voltage incoming power distribution unit, and the high-voltage incoming power distribution unit One end is electrically connected to the low-voltage reactive power compensation unit, and the other end is electrically connected to the filter group. 3. The AC filter structure for a converter station according to claim 2, wherein the filter group includes a low-voltage filter unit and the high-voltage incoming power distribution unit, and the high-voltage filter unit of the filter group One end of the incoming power distribution unit is electrically connected to the low-voltage filter unit, and the other end is electrically connected to the high-voltage incoming power distribution unit of the capacitor group. 4. The AC filter structure for a converter station according to claim 1, characterized in that, the AC filter structure also includes a down conductor, one end of the down conductor is electrically connected to the large group of incoming lines connected, and the other end is electrically connected to the sub-group bus for electrically connecting the large group incoming line and the sub-group bus. 5. The AC filter structure for a converter station according to claim 3, characterized in that, the AC filter structure further comprises a combined frame, and the combined frame is arranged on the first large group of the The surrounding side of the high-voltage incoming line power distribution unit and the surrounding side of the high-voltage incoming line power distribution unit of the filter group of the second large group are used to overhead the large group incoming line and the small group busbar. 6. The AC filter structure for a converter station according to claim 5, wherein the overhead height of the large group of incoming lines is 33 meters, and the overhead height of the small group busbars is 26 meters. 7. The AC filter structure for a converter station according to claim 5, characterized in that, the AC filter structure further comprises a tension insulator string, and both ends of the tension insulator string are connected to the joint framework. 8. The AC filter structure for a converter station according to claim 5, characterized in that, the AC filter structure further comprises a suspension insulator string, and the suspension insulator string is arranged on the joint frame for use in It is used to suspend the flexible wires for electrically connecting the small group busbars with the high-voltage incoming power distribution unit. 9. The AC filter structure for a converter station according to claim 3, wherein the high-voltage incoming power distribution unit includes three sets of incoming power distribution components, and the low-voltage reactive power compensation unit is three a capacitor bank connected in parallel, and corresponding to the three groups of incoming power distribution components; The low-voltage filtering unit is three sets of AC filters electrically connected, and corresponds to the three sets of incoming power distribution components. 10. The AC filter structure for a converter station according to claim 9, wherein the incoming power distribution assembly includes a grounding switch, a current transformer, a circuit breaker, and an isolating switch that are electrically connected in sequence, and the The low-voltage reactive power compensation unit and the low-voltage filter unit are electrically connected to the grounding switch.