CN102684308A - Superconducting state information-based power distribution network self-healing system and method - Google Patents

Abstract

A distribution network self-healing system and method based on superconducting state information, wherein the first feeder in the distribution network is connected to the second feeder through a tie switch, and the first end of the first feeder and the second feeder is a substation outlet circuit breaker, Install superconducting short-circuit current limiter SFCL and distributed FA controller for it; configure feeder automatic measurement and control terminal FTU and distributed FA controller for the section switches on the first feeder and second feeder respectively; feeder automatic measurement and control terminal FTU passes The transformer is connected to the feeder of the distribution network, the superconducting short-circuit current limiter SFCL is directly connected to the feeder of the distribution network, and the distributed FA controllers exchange information with each other through the optical fiber communication system. The invention is based on the change information of the superconducting state of the superconducting short-circuit current limiter SFCL during the fault period of the distribution network, and establishes a distribution network self-healing system based on the superconducting state information, and realizes power distribution before the relay protection action of the distribution network The fault isolation and power supply recovery of the distribution network realize the rapid self-healing function without power loss of the distribution network.

Description

Distribution network self-healing system and method based on superconducting state information

technical field

The invention relates to the field of distribution networks, in particular to a distribution network self-healing system based on superconducting state information and a method thereof, which is a distribution system that uses the information of a superconducting short-circuit current limiter during a short-circuit failure of the power grid as the main criterion. Net self-healing system.

the

Background technique

Distribution Automation (DA) is a comprehensive information management system integrating computer technology, data transmission, control technology, modern equipment and management. Reduce operating costs and reduce the labor intensity of operators. In industrially developed countries, distribution system automation has received extensive attention.

With the implementation of a new round of distribution automation pilot projects in my country, the intelligent distributed feeder automation system (Feeder Automation, FA), because it does not depend on the global information of the main station or sub The change has better adaptability, easy maintenance and other characteristics gradually favored by users. The "Technical Principles for the Pilot Construction and Transformation of Distribution Automation" and "Technical Guidelines for Distribution Automation" organized by the State Grid Corporation of China in 2009 have incorporated intelligent Distributed feeder automation system is included in the standard as a main form. The intelligent distributed feeder automation system solution can be summed up mainly including substation-level distributed FA, feeder-level distributed FA, and switch-level distributed FA. Switch-level distributed FA is divided into load switch mode and circuit breaker mode.

In order to ensure the safety and reliability of system operation, the current FA systems including Fault Location, Isolation and Supply Restoration (FLISR) mostly provide fault isolation start signals through substation outlet protection; After that, it is necessary to manually or system delay to generate a power supply recovery start signal.

Due to the large short-circuit current during the fault period, the traditional distribution network self-healing method requires the distribution network relay protection action to realize fault isolation and restore power supply in non-faulty areas after a power outage. Users must experience a short-term power outage process.

Superconducting materials have zero resistivity at critical temperature, critical flux density and critical current density, but have relatively high resistivity under normal conditions, so they have good application prospects as fault current limiters in power grids. Short-circuit current limiters based on high-temperature superconducting materials have already had grid-connected operation experience in 35/10kV power grids in many countries and regions, and realized commercial applications. By using short-circuit current limiting equipment to generate fault isolation and power supply recovery signals, the technical realization conditions are met. The invention utilizes superconducting fault current limiting technology and fault information acquisition technology to realize fault isolation and power supply recovery of the distribution network before the relay protection action of the distribution network, so that the entire distribution network can be Quick self-healing.

Contents of the invention

The purpose of the present invention is to provide a distribution network self-healing system and method based on superconducting state information, which can realize fault isolation and power supply recovery of the distribution network before the relay protection action of the distribution network, and realize the entire distribution network Fast self-healing function without power loss.

In order to achieve the above object, the present invention provides a distribution network self-healing method based on superconducting state information, using a superconducting short-circuit current limiter (Superconducting Fault Current Limiter, SFCL) to provide an action signal for the distributed feeder automation system FA, the method Include the following steps:

Step A: The superconducting short-circuit current limiter SFCL judges whether it is a fault point according to the current magnitude of each detection point; when the current of the detection point is greater than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, then The superconducting short-circuit current limiter SFCL sends fault location signals and isolation signals to the distributed feeder automation system FA; when the current at the detection point is less than the critical current of the superconducting short-circuit current limiter SFCL, no steps are performed.

Wherein said step A, after the fault occurs, the superconducting short-circuit current limiter SFCL quenches within 200 milliseconds, prior to the relay protection action, reducing the short-circuit current without affecting the original operating procedures; the superconducting device quenches immediately Trigger and send out fault location information and isolation signals, with short response time and high reliability. In the normal operation state, the superconducting short-circuit current limiter SFCL is in the superconducting state, the FA system is in the normal operation state, and the distribution network is operating normally. Collect the measurement data of each detection point, and judge whether it is necessary to isolate the fault according to the current of the detection point point.

In described step A, comprise the following steps:

Step A1: The superconducting short-circuit current limiter SFCL collects the measurement data of each detection point, and compares the current magnitude of the detection point with the critical current magnitude of the superconducting short-circuit current limiter SFCL;

Step A2: When the current at the detection point is greater than the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, and the superconducting short-circuit current limiter SFCL enters the quench state and sends fault location to the distributed feeder automation system FA Signal and isolation signal; when the current at the detection point is less than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the superconducting short-circuit current limiter SFCL is in the superconducting state, the FA system is in normal operation, the distribution network is operating normally, and the collection continues The measurement data of each inspection point.

Wherein, before the step A1, it also includes: under normal operation, the distributed feeder automation system FA system can collect real-time measurement data and upload it to the main station or data center.

Step B: According to the superconducting short-circuit current limiter SFCL, the fault location signal and isolation signal are sent out, and the distributed feeder automation system FA locates and isolates the fault point;

Wherein, in the step B, when the superconducting short-circuit current limiter SFCL becomes a quench state, that is, a high-impedance state, the fault point current and voltage of the distribution network are basically at a stable value, and the data of the distributed feeder automation system Acquisition will be more accurate and stable. In the step B, when FA faults are located in the distributed feeder automation system, the operating time of the current limiter and the fluctuation of the system measurement data after the current limiter is converted into a strong resistance state should be considered.

The step B includes the following steps:

Step B1: The distributed feeder automation system FA realizes the location of the fault point according to the distribution of the short-circuit current during the fault period;

Step B2: After the distributed feeder automation system FA confirms the location of the fault point, the distributed feeder automation system FA isolates the fault point by jumping the section switches around the fault point;

Wherein, in the step B2, due to the influence of the current limiting effect of the superconducting short-circuit current limiter SFCL, the current size of the fault point is limited, and the distributed feeder automation system FA can directly control the section switch to be disconnected after the fault is located. status without tripping of the outlet circuit breaker, so fault isolation is achieved without power outages.

Step C: After the fault point is isolated and eliminated, the superconducting short-circuit current limiter SFCL returns from the quench state to the superconducting state, and at the same time, the superconducting short-circuit current limiter SFCL sends a power supply recovery signal to the distributed feeder automation system FA, and the distributed feeder The automation system FA restores power to the non-faulty area (that is, the area without a fault);

Wherein, in the step C, after the distributed feeder automation system FA removes the fault, the superconducting short-circuit current limiter SFCL turns into a superconducting state, and the power supply between the busbar and the fault point returns to normal; if the distributed feeder automation system FA cannot When the fault is removed, the superconducting short-circuit current limiter SFCL is always in the quench state until the outlet circuit breaker trips.

Include the following steps in described step C:

Step C1: Distributed feeder automation system FA isolates and eliminates the fault point, and after eliminating the short-circuit current, the superconducting short-circuit current limiter SFCL returns from the quench state to the superconducting state;

Step C2: After the superconducting short-circuit current limiter SFCL confirms that the fault point is isolated successfully, the superconducting short-circuit current limiter SFCL sends a non-faulty area load power supply recovery signal to the distributed feeder automation system FA;

Step C3: After the distributed feeder automation system FA receives the power supply recovery signal, it restores the power supply to the non-faulty area;

Wherein, in the step C2, after the superconducting short-circuit current limiter SFCL turns into a superconducting state and sends out a fault recovery signal, the distributed feeder automation system FA restores power supply to the non-faulty area. If a second fault occurs at this time, The superconducting short-circuit current limiter SFCL will quench again to reduce the short-circuit current.

Step D: After the fault at the fault point is completely eliminated (that is, after the fault at the fault point is automatically isolated), the FA system of the distributed feeder automation system will select the section switches around the original fault point for closing operation to realize the restoration of power supply at the original fault point. Wherein, before the step D, the inspector judges the fault point through the position of the section switch of the opening.

The principle of the present invention is as follows: when the fault current exceeds the operating current of the SFCL, the SFCL utilizes the characteristics of the superconducting impedance to change sharply from the superconducting state to the normal state to enter a high resistance state and maintain a constant state, and the "quench" time t is milliseconds. Using this feature, the "quench" of SFCL can be used as the fault isolation start signal of FA. After the FA system receives the fault isolation signal sent by the SFCL, it isolates the fault point. After the fault point is successfully isolated, the SFCL will change from the "quench" state to the "superconducting" state, and send out a load recovery signal in the non-faulty area. The FA system will restore the load power supply in the non-faulty area by adjusting the operation mode.

When a 10kV single-phase ground short circuit occurs in the power grid, if the fault current does not reach the "quench" current of SFCL, the FA system will not perform fault isolation, and maintain the single-phase node operation status according to the current national standards.

The Advanced Feeder Automation (AFA) system based on SFCL device and FA system, on the basis of inheriting the traditional FA's easy installation and debugging and high adaptability, the SFCL device enhances the FLISR (fault location, isolation and recovery) response speed and reliability.

In order to achieve the above object, the present invention accordingly provides a distribution network self-healing system based on superconducting state information, including a first feeder, a second feeder, a tie switch, a section switch, a substation outlet circuit breaker, a superconducting short-circuit current Limiter SFCL, distributed FA controller and feeder automatic measurement and control terminal (Feeder Terminal Unit, FTU);

Wherein, the first feeder is connected to the second feeder through the tie switch, the substation outlet circuit breaker is installed at the first end of the first feeder and the second feeder and the superconducting short-circuit current is configured accordingly The limiter SFCL and the distributed FA controller; the section switch is set on the first feeder and the second feeder respectively, and the feeder automatic measurement and control terminal FTU and the distributed FA controller are configured accordingly ; The distributed FA controller is connected to the distribution network through a transformer, and the superconducting short-circuit current limiter SFCL is directly connected to the distribution network line.

The distributed FA controller is the controller of the distribution network, and each detection point of the distribution network is equipped with the section switch.

In summary, the present invention is based on the change information of the superconducting state of the superconducting short-circuit current limiter SFCL during the fault period of the distribution network, and establishes a distribution network self-healing system and method thereof based on superconducting state information, and the superconducting short-circuit current The superconducting state information of the limiter SFCL before and after the distribution network fault and the coordinated action mechanism of the distribution network self-healing system ensure the fault identification and start-up of the distribution network self-healing system, and realize the distribution network before the relay protection action of the distribution network. The fault isolation and power supply recovery of the power grid realize the rapid self-healing function without power loss of the distribution network.

To put it simply, the present invention adds an SFCL device at the outlet of the feeder to reduce the impact of the short-circuit current on the system; according to the "quench" state of the SFCL, it is used as a fault isolation start signal for the FA system; according to the "quench recovery" state of the SFCL, As a load recovery signal in the non-faulty area of the FA system. Compared with the prior art, the present invention has the following advantages due to the adoption of the above technical scheme:

1. The present invention combines SFCL and FA system to realize the concept of full self-healing. The distribution grid connected to the SFCL and FA system, after a fault occurs, realizes self-healing through fault location, fault isolation and power supply restoration.

2. Use SFCL to generate fault isolation and fault recovery signals, without changing the protection settings of existing substations, and the installation and debugging are simple and easy.

3. SFCL itself has a verification function. If the FA system encounters extreme conditions and cannot operate normally, the SFCL system can guarantee to operate at 3 to 4 times the normal operating current, increasing the reliability of the entire system.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the workflow of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are not intended to limit the present invention.

Fig. 1 is a structural representation of the present invention.

Please refer to Figure 1, a distribution network self-healing system based on superconducting state information, including a first feeder 1, a second feeder 2, a tie switch 3, a section switch 4, a substation outlet circuit breaker 5, a superconducting short-circuit current Limiter SFCL6, distributed FA controller 7 and feeder automatic measurement and control terminal FTU8;

Among them, the first feeder 1 is connected to the second feeder 2 through a tie switch 3, and the first end of the first feeder 1 and the second feeder 2 is a substation outlet circuit breaker 5, and the superconducting short-circuit current limiter SFCL6 and distributed FA are configured accordingly The controller 7; the segment switch 4 on the first feeder 1 and the second feeder 2 are respectively provided with the corresponding feeder automatic measurement and control terminal FTU8 and distributed FA controller 7; the feeder automatic measurement and control terminal FTU8 is connected to the distribution network through a transformer , The superconducting short-circuit current limiter SFCL6 is directly connected to the distribution network line. The distributed FA controller 7 is the controller of the distribution network self-healing system, and each distributed FA controller 7 performs information exchange through the optical fiber communication system.

The superconducting short-circuit current limiter SFCL judges whether it is a fault point according to the current of each detection point; when the current of the detection point is greater than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, and the superconducting short-circuit The current limiter SFCL sends fault location signals and isolation signals to the distributed feeder automation system FA; when the current at the detection point is less than the critical current of the superconducting short-circuit current limiter SFCL, no steps are performed.

After a fault occurs, the superconducting short-circuit current limiter SFCL will quench within 200 milliseconds, before the relay protection action, reducing the short-circuit current without affecting the original operating procedures; the quenching of the superconducting device will trigger the fault location information and isolation signal, short response time and high reliability. In the normal operation state, the superconducting short-circuit current limiter SFCL is in the superconducting state, the FA system is in the normal operation state, and the distribution network is operating normally. Collect the measurement data of each detection point, and judge whether it is necessary to isolate the fault according to the current of the detection point point.

When the current at the detection point is greater than the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, and the superconducting short-circuit current limiter SFCL enters the quench state and sends a fault location signal and isolation to the distributed feeder automation system FA Signal; when the current at the detection point is less than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the superconducting short-circuit current limiter SFCL is in a superconducting state, the FA system is in normal operation, and the distribution network is operating normally, and continue to collect the detection points measurement data.

According to the fault location signal and isolation signal sent by the superconducting short-circuit current limiter SFCL, the distributed self-healing system FA locates and isolates the fault point; the distributed FA controller realizes the distributed self-healing algorithm, which collects superconducting current limiting The data collected by the controller SFCL and FTU communicates, coordinates and cooperates with the adjacent FA controllers to realize the distributed self-healing algorithm. The typical feature of this algorithm is that when the system encounters a permanent fault, after the outlet circuit breaker trips due to protection action, the distributed self-healing algorithm starts the positioning algorithm to determine the fault area, and then trips the switches around the fault area to isolate Fault, after success, then close the exit circuit breaker or contact switch in the non-fault area to restore the power supply in the non-fault area.

Fig. 1 is a structural representation of the present invention; Fig. 2 is a schematic view of the work flow of the present invention.

Please refer to Figure 1 and Figure 2, a distribution network self-healing method based on superconducting state information, using a superconducting short-circuit current limiter SFCL to provide an action signal for the distributed feeder automation system FA, the method includes the following steps:

Step A: The superconducting short-circuit current limiter SFCL6 judges whether it is a fault point according to the current of each detection point; when the current of the detection point is greater than or equal to the critical current of the superconducting short-circuit current limiter SFCL6, the detection point is judged as a fault point, then The superconducting short-circuit current limiter SFCL6 sends fault location signals and isolation signals to the distributed feeder automation system FA; when the current at the detection point is less than the critical current of the superconducting short-circuit current limiter SFCL6, no steps are performed.

Wherein said step A, after the fault occurs, the superconducting short-circuit current limiter SFCL6 quenches within 200 milliseconds, prior to the relay protection action, reducing the short-circuit current without affecting the original operating procedures; the superconducting device quenches immediately Trigger and send out fault location information and isolation signals, with short response time and high reliability. In the normal operation state, the superconducting short-circuit current limiter SFCL6 is in the superconducting state, the FA system is in the normal operation state, and the distribution network is operating normally. Collect the measurement data of each detection point, and judge whether it is necessary to isolate the fault according to the current of the detection point point.

In described step A, comprise the following steps:

Step A1: The superconducting short-circuit current limiter SFCL6 collects the measurement data of each detection point, and compares the current magnitude of the detection point with the critical current magnitude of the superconducting short-circuit current limiter SFCL6;

Step A2: When the current at the detection point is greater than the critical current of the superconducting short-circuit current limiter SFCL6, the detection point is judged as a fault point, and the superconducting short-circuit current limiter SFCL6 enters the quench state and sends fault location to the distributed feeder automation system FA Signal and isolation signal; when the current at the detection point is less than or equal to the critical current of the superconducting short-circuit current limiter SFCL6, the superconducting short-circuit current limiter SFCL6 is in a superconducting state, the FA system is in normal operation, and the distribution network is operating normally, and continue to collect The measurement data of each inspection point.

Wherein, before the step A1, it also includes: under normal operation, the distributed feeder automation system FA system can collect real-time measurement data and upload it to the main station or data center.

Step B: According to the superconducting short-circuit current limiter SFCL6, the fault location signal and isolation signal are sent out, and the distributed feeder automation system FA locates and isolates the fault point;

Wherein, in the step B, when the superconducting short-circuit current limiter SFCL6 becomes a quench state, that is, a high-impedance state, the fault point current and voltage of the distribution network are basically at a stable value, and the data of the distributed feeder automation system Acquisition will be more accurate and stable. In the step B, when FA faults are located in the distributed feeder automation system, the operating time of the current limiter and the fluctuation of the system measurement data after the current limiter is converted into a strong resistance state should be considered.

The step B includes the following steps:

Step B1: The distributed feeder automation system FA realizes the location of the fault point according to the distribution of the short-circuit current during the fault period;

Step B2: After the distributed feeder automation system FA confirms the location of the fault point, the distributed feeder automation system FA isolates the fault point by jumping the section switch 4 around the fault point;

Wherein, in the step B2, due to the influence of the current limiting effect of the superconducting short-circuit current limiter SFCL6, the current size of the fault point is limited. In the open state, there is no need for the outlet circuit breaker to trip, so it can achieve no power-off isolation fault.

Step C: After the fault point is isolated and eliminated, the superconducting short-circuit current limiter SFCL6 returns from the quench state to the superconducting state, and at the same time, the superconducting short-circuit current limiter SFCL6 sends a power supply recovery signal to the distributed feeder automation system FA, and the distributed feeder The automation system FA restores power to the non-faulty area (that is, the area without a fault);

Wherein, in the step C, after the distributed feeder automation system FA removes the fault, the superconducting short-circuit current limiter SFCL6 turns into a superconducting state, and the power supply between the busbar and the fault point returns to normal; if the distributed feeder automation system FA cannot When the fault is removed, the superconducting short-circuit current limiter SFCL6 is always in the quench state until the outlet circuit breaker trips.

Include the following steps in described step C:

Step C1: Distributed feeder automation system FA isolates and eliminates the fault point, and after eliminating the short-circuit current, the superconducting short-circuit current limiter SFCL6 recovers from the quench state to the superconducting state;

Step C2: After the superconducting short-circuit current limiter SFCL6 confirms that the fault point is isolated successfully, the superconducting short-circuit current limiter SFCL6 sends a non-faulty area load power supply recovery signal to the distributed feeder automation system FA;

Step C3: After the distributed feeder automation system FA receives the power supply recovery signal, it restores the power supply to the non-faulty area;

Wherein, in the step C2, after the superconducting short-circuit current limiter SFCL6 turns into a superconducting state and sends out a fault recovery signal, the distributed feeder automation system FA restores power supply to the load in the non-fault area. If a second fault occurs at this time , the superconducting short-circuit current limiter SFCL6 will quench again to reduce the short-circuit current.

Step D: After the fault at the fault point is completely eliminated (that is, after the fault at the fault point is automatically isolated), the FA system of the distributed feeder automation system will select the section switch 4 around the original fault point for closing operation to realize the restoration of power supply at the original fault point. Wherein, before the step D, the inspector judges the fault point according to the position of the section switch 4 that is opened.

The principle of the present invention is as follows: when the fault current exceeds the operating current of the SFCL, the SFCL utilizes the characteristics of the superconducting impedance to change sharply from the superconducting state to the normal state to enter a high resistance state and maintain a constant state, and the "quench" time t is milliseconds. Using this feature, the "quench" of SFCL can be used as the fault isolation start signal of FA. After the FA system receives the fault isolation signal sent by the SFCL, it isolates the fault point. After the fault point is successfully isolated, the SFCL will change from the "quench" state to the "superconducting" state, and send out a load recovery signal in the non-faulty area. The FA system will restore the load power supply in the non-faulty area by adjusting the operation mode.

When a 10kV single-phase ground short circuit occurs in the power grid, if the fault current does not reach the "quench" current of SFCL, the FA system will not perform fault isolation, and maintain the single-phase node operation status according to the current national standards.

The Advanced Feeder Automation (AFA) based on the SFCL device and the FA system of the distribution network, on the basis of inheriting the traditional FA's easy installation and debugging and high adaptability, the SFCL device enhances the response speed and reliability of the FLISR sex.

In summary, the present invention is based on the change information of the superconducting state of the high-temperature superconducting short-circuit current limiter during the fault period of the distribution network, and establishes a distribution network self-healing system based on the superconducting state information. Realize the fault isolation and power supply recovery of the distribution network before the operation, and realize the fast self-healing function without power loss of the distribution network.

For those skilled in the art, without departing from the essential scope of the present invention, any appropriate replacement or modification of the above embodiments will fall within the scope of the claims of the present invention. The exemplary implementations are illustrative only and not limiting of the invention, the scope of which is defined by the appended claims.

Claims (12)

1. A distribution network self-healing method based on superconducting state information, characterized in that, comprising steps: Step A: The superconducting short-circuit current limiter SFCL judges whether it is a fault point according to the current magnitude of each detection point; when the current of the detection point is greater than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, then The superconducting short-circuit current limiter SFCL sends fault location signals and isolation signals to the distributed feeder automation system FA; when the current at the detection point is less than the critical current of the superconducting short-circuit current limiter SFCL, no steps are performed. 2. The step A includes the following steps: Step A1: The superconducting short-circuit current limiter SFCL collects the measurement data of each detection point, and compares the current magnitude of the detection point with the critical current magnitude of the superconducting short-circuit current limiter SFCL; Step A2: When the current at the detection point is greater than the critical current of the superconducting short-circuit current limiter SFCL, the detection point is judged as a fault point, and the superconducting short-circuit current limiter SFCL enters the quench state and sends fault location to the distributed feeder automation system FA Signal and isolation signal; when the current at the detection point is less than or equal to the critical current of the superconducting short-circuit current limiter SFCL, the superconducting short-circuit current limiter SFCL is in the superconducting state, the FA system is in normal operation, the distribution network is operating normally, and the collection continues The measurement data of each inspection point. 3. Step B: According to the superconducting short-circuit current limiter SFCL, the fault location signal and isolation signal are sent out, and the distributed feeder automation system FA locates the fault point and implements isolation; The step B includes the following steps: Step B1: The distributed feeder automation system FA realizes the location of the fault point according to the distribution of the short-circuit current during the fault period; Step B2: After the distributed feeder automation system FA confirms the location of the fault point, the distributed feeder automation system FA isolates the fault point by jumping the section switches around the fault point; Step C: After the fault point is isolated and eliminated, the superconducting short-circuit current limiter SFCL returns from the quench state to the superconducting state, and at the same time, the superconducting short-circuit current limiter SFCL sends a power supply recovery signal to the distributed feeder automation system FA, and the distributed feeder automation The system FA restores power to the non-faulty area (that is, the area without a fault); Include the following steps in described step C: Step C1: Distributed feeder automation system FA isolates and eliminates the fault point, and after eliminating the short-circuit current, the superconducting short-circuit current limiter SFCL returns from the quench state to the superconducting state; Step C2: After the superconducting short-circuit current limiter SFCL confirms that the fault point is isolated successfully, the superconducting short-circuit current limiter SFCL sends a non-faulty area load power supply recovery signal to the distributed feeder automation system FA; Step C3: After the distributed feeder automation system FA receives the power supply recovery signal, it restores the power supply to the non-faulty area; Step D: After the fault point is automatically isolated, the FA system of the distributed feeder automation system will select the section switches around the original fault point to perform closing operation, so as to realize the restoration of power supply at the original fault point. 4. The distribution network self-healing method based on superconducting state information according to claim 1, characterized in that, before the step A1, it also includes: under normal operation, the distributed feeder automation system FA system can collect real-time Measure data and upload to master station or data center. 5. the distribution network self-healing method based on superconducting state information according to claim 1, is characterized in that, in described step A, after fault takes place, superconducting short-circuit current limiter SFCL quenches within 200 milliseconds , before the relay protection action, reducing the short-circuit current without affecting the original operating procedures; the quenching of the superconducting device triggers the fault location information and isolation signal, with short response time and high reliability. 6. The distribution network self-healing method based on superconducting state information according to claim 1, characterized in that, in the step B, when the superconducting short-circuit current limiter SFCL becomes the quench state, it is high resistance In the normal state, the fault point current and voltage of the distribution network are basically at a stable value, and the data acquisition of the distributed feeder automation system will be more accurate and stable. 7. The distribution network self-healing method based on superconducting state information according to claim 1, characterized in that, in the step B, when FA fault location of the distributed feeder automation system, the action time of the current limiter should be considered And after it is transformed into a strong resistance state, the fluctuation of the system measurement data. 8. the distribution network self-healing method based on superconducting state information according to claim 1, is characterized in that, in described step B2, due to the influence of superconducting short-circuit current limiter SFCL current-limiting action, the current of fault point The size is limited. After the fault is located, the distributed feeder automation system FA can directly control the sectional switch to be in the disconnected state without tripping the outlet circuit breaker, so it can achieve no power-off isolation fault. 9. the distribution network self-healing method based on superconducting state information according to claim 1, it is characterized in that, in described step C, after distributed feeder automation system FA by troubleshooting, superconducting short-circuit current limiter SFCL turns into a superconducting state, and the power supply between the busbar and the fault point returns to normal; if the distributed feeder automation system FA cannot remove the fault, the superconducting short-circuit current limiter SFCL is always in the quench state until the outlet circuit breaker trips. 10. The distribution network self-healing method based on superconducting state information according to claim 1, characterized in that, in the step C2, after the superconducting short-circuit current limiter SFCL turns into a superconducting state, a fault recovery signal is sent Finally, the distributed feeder automation system FA restores power to the loads in the non-fault area. If a second fault occurs at this time, the superconducting short-circuit current limiter SFCL will quench again to reduce the short-circuit current. 11. The distribution network self-healing method based on superconducting state information according to claim 1, characterized in that, before the step D, the inspection personnel judge the fault point by the position of the section switch of the opening. 12. A distribution network self-healing system based on superconducting state information, including first feeder, second feeder, tie switch, section switch, substation outlet circuit breaker, superconducting short-circuit current limiter SFCL, and distributed FA control Automatic monitoring and control terminal FTU for feeders and feeders, characterized in that the first feeder is connected to the second feeder through the tie switch, and the first end of the first feeder and the second feeder is a substation outlet circuit breaker, Correspondingly configure the superconducting short-circuit current limiter SFCL and the distributed FA controller; the segment switches on the first feeder and the second feeder are respectively set to the corresponding feeder automatic measurement and control terminal FTU and the distributed FA controller; the feeder automatic measurement and control terminal FTU is connected in the distribution network through a transformer, and the superconducting short-circuit current limiter SFCL is directly connected to the distribution network line; the distributed FA controller is The controller of the distribution network self-healing system, each of the distributed FA controllers performs information exchange through the optical fiber communication system.

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