CN207504574U - A kind of electric power system of based superconductive circuit - Google Patents

Abstract

The utility model relates to a power supply system based on superconducting lines. The power supply system includes a traditional power supply system and a superconducting power supply line module. The power supply bus in the traditional power supply line is connected, and the second end of the superconducting power supply line module is connected to the user's power supply line access end; the superconducting power supply line module includes a superconducting power supply line, a superconducting power supply line input switch and The superconducting power supply line output switch assembly, the superconducting power supply line input switch is located at the first end of the superconducting power supply line, connected to the power supply bus through the spare power supply position, and the superconducting power supply line output switch assembly is located at the superconducting power supply line The second end is connected with the user's power supply line access end. Compared with the prior art, the utility model has the advantages of low reconstruction cost, stable power supply, suitable for popularization and the like.

Description

A power supply system based on superconducting lines

technical field

The utility model relates to the field of electric power system power supply, in particular to a power supply system based on superconducting lines.

Background technique

In recent years, the application of superconducting lines in urban power systems has gradually attracted attention. Urban power systems often have the characteristics of high load density, large load demand, high network loss, and extremely tight line channels. High-temperature superconducting cable is a kind of power facility that uses unimpeded superconducting materials that can transmit high current density as conductors and can transmit large currents. It has the advantages of small size, light weight, low loss and large transmission capacity. It can realize Low loss, high efficiency, large capacity transmission. High-temperature superconducting cables will first be used in short-distance power transmission occasions (such as generators to transformers, substation centers to substations, underground substations to urban power grid ports), power plants and substations and other occasions for short-distance transmission of large currents, as well as large-scale Or the occasion of very large urban power transmission.

In the case of the same weight and size, compared with conventional power cables, the capacity of high-temperature superconducting cables can be increased by 3-5 times, and the loss can be reduced by 60%, which can significantly save floor space and space, and save precious land resources. Retrofitting existing underground cable systems with high-temperature superconducting cables: the transmission capacity can be increased several times. The use of high-temperature superconducting cables can also change the traditional power transmission method, and use low voltage and high current to transmit electric energy. Therefore, high-temperature superconducting cables can greatly reduce the loss of the power system and improve the overall efficiency of the power system.

Since each substation in the city has its own power supply system, if the existing substation and power supply system are eliminated and the superconducting power supply line is directly re-established, on the one hand, it will cause a waste of resources and a substantial increase in cost; on the other hand, due to superconducting Conductive power supply is still in the emerging stage, and there will still be many failures and unstable power supply through superconducting lines. Therefore, how to supply power through superconducting lines on the basis of existing substations has become an urgent problem to be solved. question.

Utility model content

The purpose of this utility model is to provide a power supply system based on superconducting lines to solve the above problems.

The purpose of this utility model can be achieved through the following technical solutions:

A power supply system based on a superconducting line, the power supply system includes a traditional power supply system and a superconducting power supply line module, the first end of the superconducting power supply line module is connected to the traditional power supply line through the standby power supply position in the traditional power supply line The power supply bus is connected, and the second end of the superconducting power supply line module is connected to the user's power supply line access end.

Preferably, the superconducting power supply line module includes a superconducting power supply line, a superconducting power supply line input switch and a superconducting power supply line output switch assembly, the superconducting power supply line input switch is located at the first end of the superconducting power supply line, through The spare power supply position is connected to the power supply bus, and the output switch assembly of the superconducting power supply line is located at the second end of the superconducting power supply line and connected to the user's power supply line access end.

Preferably, the superconducting power supply line output switch assembly includes a series switch assembly or a parallel switch assembly.

Preferably, the series switch assembly includes a plurality of superconducting power supply line output switches connected in series, the output end of each superconducting power supply line output switch is respectively connected to the input end of the next superconducting power supply line output switch and the corresponding The user's power supply line is connected, and the input end of the output switch of the first superconducting power supply line is connected with the second end of the superconducting power supply line.

Preferably, the number of output switches of the superconducting power supply line is equal to the number of enabled power supply bins in the traditional power supply system.

Preferably, the parallel switch assembly includes a main control switch and a plurality of superconducting power supply line output switches connected in parallel, the input end of each superconducting power supply line switch is connected to the output end of the main control switch, and each superconducting power supply line switch The output ends of the power supply line switches are all connected to the corresponding user's power supply lines, and the input ends of the master control switch are connected to the second end of the superconducting power supply line.

Preferably, the number of output switches of the superconducting power supply line is equal to the number of enabled power supply bins in the traditional power supply system.

Preferably, a superconducting power supply extension line is also provided between the main control switch and the output switch of the superconducting power supply line, the first end of the superconducting power supply extension line is connected to the output end of the main control switch, and the superconducting power supply line The second end of the power supply extension line is connected to a plurality of parallel power supply lines, the number of the parallel power supply lines is equal to the number of superconducting power supply line output switches, and each of the parallel power supply lines is connected to the corresponding superconducting power supply line output switch input connection.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The power supply system based on the superconducting line proposed by the utility model is to transform the original traditional power supply system, and to supply power for the superconducting power supply line module by using the spare power supply position in the traditional power supply system, so that it can Realize superconducting power supply without discarding the original power supply system, and because the utility model utilizes the spare position of the traditional power supply system, when there is a problem with the power supply of the superconducting line, the superconducting power supply line module can be disconnected to continue The original power supply line is used for normal power supply, which solves the problem of unstable power supply of the superconducting power supply line.

(2) The superconducting power supply line module includes a superconducting power supply line, a superconducting power supply line input switch, and a superconducting power supply line output switch assembly, which realizes the switch control at both ends of the superconducting power supply line. When the power supply line needs maintenance, you only need to control the opening and closing of the switches at both ends to switch the power supply mode flexibly, with flexible power supply and good power supply stability.

(3) The superconducting power supply line output switch assembly includes a series switch assembly. The series switch assembly realizes the connection with all the original power supply lines through a plurality of superconducting power supply line output switches connected in series. This connection mode switch The quantity is small, and the electrical layout in the station is simple. When the structure of the traditional power supply system itself is simple and the superconducting power supply line is relatively stable, using this series switch component for connection can achieve better superconducting power supply effect at the lowest cost. .

(4) The superconducting power supply line output switch assembly includes a parallel switch assembly, which is connected with a plurality of parallel superconducting power supply line output switches through a master control switch, and each superconducting power supply line output switch is connected with the original one. The power supply line connected to the power supply position is connected. Although this connection method has a large number of switches, the parallel structure makes the interference between each line small. Therefore, the protection action is simple and the power supply reliability is high. When the structure of the traditional power supply system itself is complex or the superconducting power supply line is unstable, using this parallel switch component to connect can achieve a stable power supply effect and improve user performance. power experience.

(5) There is also a superconducting power supply extension line between the main control switch and the superconducting power supply line output switch. By setting the extension line, the effect of superconducting power supply can be further improved, and the overall efficiency of the power supply system can be improved.

(6) According to the actual situation of the traditional power supply system, choose to install a series switch module or a parallel switch module, which is flexible and practical.

Description of drawings

Fig. 1 is a schematic structural diagram of a power supply system based on superconducting lines using parallel switch assemblies in this embodiment;

FIG. 2 is a schematic structural view of a power supply system based on superconducting lines using series switch assemblies in this embodiment;

FIG. 3 is a schematic structural diagram of a traditional power supply system in this embodiment.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

As shown in Figure 1, this embodiment provides a power supply system based on superconducting lines, including a traditional power supply system and a superconducting power supply line module, the first end of the superconducting power supply line module passes through the standby power supply position in the traditional power supply line It is connected with the power supply bus in the traditional power supply line, and the second end of the superconducting power supply line module is connected with the user's power supply line access end.

Among them, the superconducting power supply line module includes a superconducting power supply line, a superconducting power supply line input switch and a superconducting power supply line output switch assembly. The superconducting power supply line input switch is located at the first end of the superconducting power supply line. Busbar connection, the output switch assembly of the superconducting power supply line is located at the second end of the superconducting power supply line, and is connected with the user's power supply line access end. The output switch assembly of the superconducting power supply line includes a series switch assembly or a parallel switch assembly, which is selected according to actual conditions.

The series switch assembly includes a plurality of superconducting power supply line output switches connected in series, and the output end of each superconducting power supply line output switch is respectively connected to the input end of the next superconducting power supply line output switch and the corresponding user's power supply line , the input end of the output switch of the first superconducting power supply line is connected with the second end of the superconducting power supply line. The number of output switches of the superconducting power supply line is equal to the number of enabled power supply positions in the traditional power supply system.

The parallel switch assembly includes a main control switch and a plurality of superconducting power supply line output switches connected in parallel, the input end of each superconducting power supply line switch is connected with the output end of the main control switch, and the output of each superconducting power supply line switch Both terminals are connected to the corresponding user's power supply line, and the input terminal of the master control switch is connected to the second terminal of the superconducting power supply line. The number of output switches of the superconducting power supply line is equal to the number of enabled power supply positions in the traditional power supply system. A superconducting power supply extension line is also arranged between the main control switch and the output switch of the superconducting power supply line, the first end of the superconducting power supply extension line is connected to the output end of the main control switch, and the second end of the superconducting power supply extension line is connected to the multiple The number of parallel power supply lines is equal to the number of superconducting power supply line output switches, and each of the parallel power supply lines is connected to the input end of the corresponding superconducting power supply line output switch.

Based on the above structure, in this embodiment, the traditional power supply system of a 35kV bus in a 220kV substation is taken as an example to carry out the arrangement of superconducting power supply lines. The specific conditions are as follows:

As shown in Figure 3, in this embodiment, in the traditional power supply system, the 35kV busbars of the 220kV site are 5 positions, of which 4 times are activated and 1 time is reserved. In this embodiment, the longest superconducting line is no more than 1km, and The capacity can reach 121MVA. Therefore, a superconducting station is built outside the station, and superconducting lines are used to replace the outgoing lines corresponding to the 4 enabled positions to deliver power to users. According to the "Technical Guidelines for Planning and Design of Shanghai Power Grid", the cross section of each 35kV outgoing line can be selected as 3*400mm2 or double 3*400mm2, and the transmission capacity of each circuit is about 21.7MVA~43.4MVA. After the superconducting line is adopted, the superconducting line is output from the fifth spare position. The transmission capacity of the 35kV superconducting line is about 121MVA, and the current is considered to be 2000A, which can replace 3~4 conventional 35kV lines.

The power supply system realized by using parallel switch components is finally shown in Figure 1. It can be seen from the figure that in the original standby power supply position, the superconducting power supply line is connected to the superconducting power supply line through the input switch, and the superconducting power supply line The other end is connected with a master control switch, and after the master control switch is connected with a superconducting power supply line, four parallel superconducting power supply line output switches are respectively connected through normal power transmission lines, and the four parallel superconducting power supply line output switches Switches, each of which is parallel to the traditional user power supply line on the corresponding starting position, a normally closed switch is arranged on each power supply line, and each superconducting power supply line output switch is connected to a corresponding normally closed switch , while the original traditional power supply line remains unchanged and is also connected to the normally closed switch, but the switch on the enabling position is changed to a normally open state, then when the superconducting power supply line is in a normal state, the power supply mode of the power supply system Change to superconducting line power supply. When the superconducting line fails or is overhauled, first disconnect the superconducting power supply line input switch and the main control switch. No influence, just close the switch in the normally open state to switch the power supply mode.

From the above system and operation, it can be seen that the power supply system using parallel switch components has the outstanding advantage that when there is a problem with the superconducting line and the power supply mode needs to be switched, only two switches can be disconnected to realize the superconducting line disconnection. Open, simple operation and quick response, so it has high safety performance; however, it also has obvious disadvantages, that is, the whole system requires a large number of switches and a relatively complicated structure, so this system is more suitable for the original power supply system with large scale and relatively complex circuit structure. Complex and unstable superconducting power supply.

The power supply system realized by series switch components is finally shown in Figure 2. It can be seen from the figure that in the original standby power supply position, the superconducting power supply line is connected to the superconducting power supply line through the input switch, and the superconducting power supply line The other end is sequentially connected with four superconducting power supply line output switches in series, the output end of each superconducting power supply line output switch is connected to a power supply line connected to the user's enabled warehouse, and each power supply line is provided with a For the normally closed switch, the original traditional power supply line remains unchanged, but the switch on the enabling position is changed to the normally open state, and the superconducting power supply line input switch is in the normally closed state, then the superconducting power supply line is in a normal state Next, the power supply mode of the power supply system is changed to superconducting line power supply. When the superconducting line fails or is overhauled, it is first necessary to disconnect the superconducting power supply line input switch and the first superconducting power supply line output switch, but attention should be paid Yes, if the other superconducting power supply line output switches are not disconnected, the power supply lines corresponding to different enabled positions will affect each other. There is a switch on the power supply line to realize the switching of the power supply mode and ensure the stability of the power system.

It can be seen from the above system structure and operation process that the power supply system using series switch components has the outstanding advantages of a small number of switches and a simple system structure; however, it also has obvious disadvantages, that is, problems occur in the superconducting power supply line When it is necessary to switch the power supply mode, the operation is complicated and time-consuming, so there is a lack of safety. Therefore, this system is more suitable for the situation where the original power supply system is small in scale, the circuit structure is relatively simple, and the superconducting power supply mode is stable.

In addition to the structures of the above two power supply systems, the power supply of superconducting lines can also be realized in other ways. The most important thing is to use the backup lines in the existing power supply system as superconducting power supply lines, without abandoning the current power supply system. Make full use of the resources of the power supply system. In the above two implementation methods, since the current superconducting power supply is still in the developing stage and is not mature enough, and most of the power supply stations themselves have intricate structures, the power supply system generally adopts parallel switch components to achieve better results. Effect.

Claims (7)

1. A power supply system based on a superconducting line, characterized in that, the power supply system includes a traditional power supply system and a superconducting power supply line module, and the first end of the superconducting power supply line module is powered by a backup power supply in the traditional power supply line The warehouse is connected to the power supply bus in the traditional power supply line, and the second end of the superconducting power supply line module is connected to the user's power supply line access end; the superconducting power supply line module includes a superconducting power supply line, a superconducting power supply line input A switch and a superconducting power supply line output switch assembly, the superconducting power supply line input switch is located at the first end of the superconducting power supply line, and is connected to the power supply busbar through a spare power supply position, and the superconducting power supply line output switch assembly is located at the superconducting power supply line The second end of the line is connected to the user's power supply line access end. 2 . The power supply system based on superconducting lines according to claim 1 , wherein the superconducting power supply line output switch assembly comprises a series switch assembly or a parallel switch assembly. 3 . 3. The power supply system based on superconducting lines according to claim 2, wherein the series switch assembly comprises a plurality of superconducting power supply line output switches connected in series, and the output of each superconducting power supply line output switch The terminals are respectively connected to the input end of the next superconducting power supply line output switch and the corresponding user's power supply line, and the input end of the first superconducting power supply line output switch is connected to the second end of the superconducting power supply line. 4. The power supply system based on superconducting lines according to claim 3, wherein the number of output switches of the superconducting power supply lines is equal to the number of enabled power supply positions in the traditional power supply system. 5. The power supply system based on superconducting lines according to claim 2, wherein the parallel switch assembly comprises a master control switch and a plurality of superconducting power supply line output switches connected in parallel, each superconducting power supply line The input ends of the switches are all connected to the output ends of the main control switch, and the output ends of each superconducting power supply line switch are connected to the corresponding user's power supply lines, and the input ends of the general control switch are connected to the second end of the superconducting power supply line. end connection. 6. The power supply system based on superconducting lines according to claim 5, wherein the number of output switches of the superconducting power supply lines is equal to the number of enabled power supply positions in the traditional power supply system. 7. The power supply system based on superconducting lines according to claim 5, characterized in that, a superconducting power supply extension line is also arranged between the said master control switch and the superconducting power supply line output switch, and said superconducting power supply extension line The first end of the line is connected to the output end of the main control switch, the second end of the superconducting power supply extension line is connected to a plurality of parallel power supply lines, and the number of the parallel power supply lines is equal to the number of superconducting power supply line output switches , each of the parallel power supply lines is connected to the input end of the output switch of the corresponding superconducting power supply line.