CN115051333A - Differential protection and self-healing system for intelligent distribution network - Google Patents

Abstract

The invention discloses an intelligent distribution network differential protection and self-healing system, comprising circuit breakers located on the boundary of each regional power grid of the distribution network for disconnecting fault current, and each circuit breaker is equipped with a protection measurement and control device device, the protection measurement and control device is connected with the self-healing module, the protection measurement and control device includes a DSP processing unit, the signal output end of the DSP processing unit is connected with the signal input end of the actuator, and the signal output end of the actuator is connected with the action mechanism control signal of the circuit breaker The input end is connected, the signal output and input end of the DSP processing unit are connected with the signal input and output end of the storage unit, the signal input end of the DSP processing unit is connected with the signal output end of the analog-to-digital conversion unit, and the analog-to-digital conversion unit is connected. The signal input end of the unit is connected with the signal output end of the sensor unit; the present invention realizes the purpose of fault protection of the distribution network by detecting voltage, current and temperature data.

Description

An intelligent distribution network differential protection and self-healing system

technical field

The invention belongs to the technical field of distribution network protection, in particular to an intelligent distribution network differential protection and self-healing system.

Background technique

With the development of social economy and the large-scale application of high-tech digital equipment, the economic losses and adverse effects caused by power supply interruption and unqualified power quality to the society are increasing. At the same time, users have higher and higher requirements for power supply quality. It is an important means to improve the reliability of the power supply of the distribution network to accurately locate the fault point of the distribution network, quickly isolate the fault point and restore the power supply of the load in the non-faulty section.

On the one hand, the existing differential protection system is not suitable for the circuit breakers that are far apart in the distribution network, and is not suitable for the application of the distribution network with a large uncertainty in the network topology operation state, and the conventional differential protection is directly tripped. The logic of the circuit breaker directly connected to the fault point cannot meet the application requirements of the switch distribution network; The circuit is disconnected, and all the current is transferred to other circuits. At this time, the current and voltage of other circuits will increase, and some circuits have different degrees of aging. These problems cannot be counted in the system. high current, it may be damaged again, causing a larger circuit failure.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is to provide an intelligent distribution network differential protection and self-healing system to improve the level of distribution network fault protection.

In order to solve the above technical problems, the present invention provides an intelligent distribution network differential protection and self-healing system, including:

A circuit breaker for disconnecting fault currents located on the boundary of each regional power grid of the distribution network, each of the circuit breakers is equipped with a protection measurement and control device, and the protection measurement and control device is connected with the self-healing module; the protection The measurement and control device includes a DSP processing unit, the signal output end of the DSP processing unit is connected with the signal input end of the actuator, the signal output end of the actuator is connected with the control signal input end of the action mechanism of the circuit breaker, and the signal output end of the DSP processing unit is connected with the signal input end of the actuator. The output and input ends are connected with the signal input and output ends of the storage unit, the signal input end of the DSP processing unit is connected with the signal output end of the analog-to-digital conversion unit, and the signal input end of the analog-to-digital conversion unit is connected with the sensor unit connected to the signal output.

Further, the sensor unit includes a load voltage sensor, a load current sensor, a leakage current sensor and a temperature sensor, which respectively realize the detection of the load voltage, the load current, the leakage current and the temperature of the power distribution switch cabinet, and detect the phase angle difference. Unit power factor calculation, DSP processing unit switch cabinet fault monitoring and electrical load prediction provide raw signals; load voltage sensor, load current sensor, leakage current sensor and temperature sensor are all connected to the analog-to-digital conversion unit.

Further, the protection measurement and control device further comprises a first analog quantity acquisition module, a second analog quantity acquisition module, a switch quantity acquisition module, a first differential protection module, a second differential protection module, a single-chip microcomputer and an Ethernet interface circuit, The first analog quantity acquisition module, the second analog quantity acquisition module, the switch quantity acquisition module, the first differential protection module and the second differential protection module are respectively connected with the DSP processing unit, and the DSP processing unit is connected to the DSP processing unit through the CAN bus. The single-chip microcomputer is connected with the communication relay through the Ethernet interface circuit.

Further, the first analog quantity acquisition module includes a first current sensor, a first voltage transformer, a first low-pass filter and a first A/D converter arranged on the circuit where the circuit breaker is located. The output ends of a current sensor and the first voltage transformer are respectively connected to the input end of the first low-pass filter, and the output end of the first low-pass filter is connected to the processor through the first A/D converter.

Further, the second analog quantity acquisition module includes a second current sensor, a second voltage transformer, a second low-pass filter and a second A/D converter arranged on the line where the load switch is located. The output ends of the two current sensors and the second voltage transformer are respectively connected to the input end of the second low-pass filter, and the output end of the second low-pass filter is connected to the processor through the second A/D converter.

Further, the self-healing module includes a line self-healing system, a power distribution network, a line detection system and a fault alarm unit, and the line detection system includes a detection data comparison unit, a branch circuit detection unit, a main line detection unit and a backup line periodic detection unit. , the output ends of the branch circuit detection unit, the bus line detection unit and the backup line periodic detection unit are all connected with the input end of the detection data comparison unit.

Further, the fault alarm unit includes a wireless communication module, a Beidou positioning module, a fault data uploading module and a line area number uploading module, the output end of the line area number uploading module is connected with the input end of the fault data uploading module, and the fault data uploading module is connected. The output end of the Beidou positioning module and the Beidou positioning module are connected to the input end of the wireless communication module. The line self-healing system is connected to the distribution network in two directions. The output end of the line detection system is connected to the line self-healing system, the distribution network and the fault alarm unit respectively. The input end is connected, and the output end of the human-computer interaction interface is connected with the input end of the line self-healing system.

Further, the line self-healing system includes a line estimation and analysis system, a risk assessment system and a multi-line transfer system, and the line estimation and analysis system includes a transfer amount estimation unit, a transfer amount peak output module, and an actual transfer amount comparison unit. , compare the information feedback unit, the difference intelligent analysis system and the actual transfer amount peak input module, the output end of the transfer amount estimation unit is connected with the input end of the transfer amount peak output module.

Further, the multi-line transfer system includes a transfer ratio adjustment system, a line early warning unit and a line current fluctuation monitoring unit, the output end of the line current fluctuation monitoring unit is connected with the input end of the line early warning unit, and the output end of the line early warning unit is connected to the transfer unit. The input terminal of the proportional adjustment system is connected. The transfer proportional adjustment system includes a transfer ratio input module, a total voltage distribution adjustment component and a branch voltage distribution adjustment component. The output terminal of the transfer ratio input module is connected with the input terminal of the total voltage distribution adjustment component. The output ends of the voltage distribution and adjustment components are respectively connected with the input ends of the normal circuit and the branch voltage distribution and adjustment components, the output ends of the branch voltage distribution and adjustment components are connected with the input ends of the standby circuit, and the multi-line transfer system is respectively connected with the line estimation and The analysis system, the risk assessment system and the distribution network are connected in both directions.

Further, the risk assessment system includes a risk display module, an operation pre-judgment unit, a circuit simulation system, a risk feedback module, a fault line statistics module and a data entry module, and the output end of the data entry module is connected to the input end of the fault line statistics module. , the output end of the fault line statistics module is connected with the input end of the operation prediction unit, the output end of the operation prediction unit is connected with the input end of the risk display module, the output end of the risk display module is connected with the input end of the circuit simulation system, and the circuit The output end of the simulation system is respectively connected with the input end of the operation prediction unit and the risk feedback module.

The implementation of the present invention has the following beneficial effects: the present invention can simulate the running state of the overall circuit, facilitate manual viewing and participation in control, and can predict according to the rules, which is convenient for staff to discover problems in advance, stop and adjust the current distribution in time, and manually Combined with intelligent analysis and processing, the safety of the circuit is ensured; the invention realizes the purpose of fault protection of the distribution network by detecting the voltage, current and temperature data, and lays a foundation for the development of the intelligent technology of the distribution network.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a structural block diagram of an intelligent distribution network differential protection and self-healing system according to an embodiment of the present invention.

FIG. 2 is a structural block diagram of a line self-healing system in an embodiment of the present invention.

FIG. 3 is a structural block diagram of a line detection system in an embodiment of the present invention.

FIG. 4 is a structural block diagram of a line estimation and analysis system in an embodiment of the present invention.

FIG. 5 is a structural block diagram of a fault alarm unit in an embodiment of the present invention.

FIG. 6 is a structural block diagram of a risk assessment system in an embodiment of the present invention.

FIG. 7 is a structural block diagram of a multi-line transfer system in an embodiment of the present invention.

FIG. 8 is a structural block diagram of a transfer ratio adjustment system in an embodiment of the present invention.

Detailed ways

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the invention may be practiced.

Referring to FIG. 1 , an embodiment of the present invention provides an intelligent distribution network differential protection and self-healing system, including:

A circuit breaker for disconnecting fault currents located on the boundary of each regional power grid of the distribution network, each of the circuit breakers is equipped with a protection measurement and control device, and the protection measurement and control device is connected with the self-healing module; the protection The measurement and control device includes a DSP processing unit, the signal output end of the DSP processing unit is connected with the signal input end of the actuator, the signal output end of the actuator is connected with the control signal input end of the action mechanism of the circuit breaker, and the signal output end of the DSP processing unit is connected with the signal input end of the actuator. The output and input ends are connected with the signal input and output ends of the storage unit, the signal input end of the DSP processing unit is connected with the signal output end of the analog-to-digital conversion unit, and the signal input end of the analog-to-digital conversion unit is connected with the sensor unit connected to the signal output.

In this embodiment, the sensor unit includes a load voltage sensor, a load current sensor, a leakage current sensor and a temperature sensor, which respectively detect the load voltage, load current, leakage current and the temperature of the power distribution switchgear, and provide phase Angle difference detection unit power factor calculation, DSP processing unit switch cabinet fault monitoring and electrical load prediction provide raw signals; load voltage sensor, load current sensor, leakage current sensor and temperature sensor are all connected to the analog-to-digital conversion unit.

In this embodiment, the protection measurement and control device further includes a first analog quantity acquisition module, a second analog quantity acquisition module, a switch quantity acquisition module, a first differential protection module, a second differential protection module, a single-chip microcomputer, and an Ethernet Interface circuit, the first analog quantity acquisition module, the second analog quantity acquisition module, the switch quantity acquisition module, the first differential protection module and the second differential protection module are respectively connected with the DSP processing unit, and the DSP processing unit passes through The CAN bus is connected with the single-chip microcomputer, and the single-chip microcomputer is communicated and connected with the communication relay through the Ethernet interface circuit.

In this embodiment, the first analog quantity acquisition module is used to collect the line current and voltage of the circuit where the circuit breaker is located, and transmit the current and voltage data to the DSP processing unit; the second analog quantity acquisition module is used for It is used to collect the line current and voltage of the line where the load switch is located, and transmit the current and voltage data to the DSP processing unit; the switch value acquisition module is used to collect the opening and closing states of the circuit breaker and the load switch, and transmit corresponding signals to the DSP a processing unit; the first differential protection module is used to receive the control signal sent by the main control module to control the switch state of the circuit breaker; the second differential protection module is used to receive the control signal sent by the main control module, Control the switch state of the load switch.

In this embodiment, the DSP processing unit is used to receive the current and voltage of the circuit where the circuit breaker is located, and the current and voltage of the circuit where the load switch is located, and conduct real-time data interaction with the single-chip microcomputer, and the single-chip microcomputer transmits the received data to the communication Transfer, at the same time receive the voltage and current protection data sent by the communication relay, and transmit it to the DSP processing unit. The DSP processing unit compares the sampled voltage and current data with the voltage and current protection data, and judges whether the differential current protection criterion is met. According to the conditions, the circuit breaker is controlled by the first differential protection module to be in a trip state. After the action of tripping the circuit breaker is completed, if the current at the load switch is lower than the rated current, the second differential protection module is used to control the load switch to be in a trip state. In the open state, the differential protection of the line is realized.

In this embodiment, the communication relay includes several WEB servers arranged in each regional power grid, and each WEB server actively acquires the data provided by the protection, measurement and control terminals in each regional power grid of the distribution network, and obtains the data. The data is sent to the monitoring master station, and the voltage and current protection data sent by the monitoring master station are received; the monitoring master station includes a cloud server, and the data provided by each protection measurement and control terminal received by the cloud server is summarized, and the voltage and current The protection data is sent to each WEB server.

In this embodiment, the first analog quantity acquisition module includes a first current sensor, a first voltage transformer, a first low-pass filter and a first A/D converter arranged on the circuit where the circuit breaker is located, The output ends of the first current sensor and the first voltage transformer are respectively connected with the input end of the first low-pass filter, and the output end of the first low-pass filter is connected to the processor through the first A/D converter connect.

In this embodiment, the second analog quantity acquisition module includes a second current sensor, a second voltage transformer, a second low-pass filter and a second A/D converter arranged on the line where the load switch is located, The output ends of the second current sensor and the second voltage transformer are respectively connected with the input end of the second low-pass filter, and the output end of the second low-pass filter is connected to the processor through the second A/D converter connect.

In this embodiment, the first differential protection module is connected to the control circuit of the circuit breaker, and the first differential protection module sends a trip signal to control the opening and closing states of the circuit breaker. The second differential protection module is connected with the control loop of the load switch, and the second differential protection module sends a trip signal to control the switching state of the load switch. The first differential protection module and the second differential protection module respectively use protection processors.

In this embodiment, the protection measurement and control terminal further includes a human-computer interaction module, the human-computer interaction module is connected to the DSP processing unit, and the human-computer interaction module includes a touch screen and operating entity buttons.

As shown in Figures 2-8, in this embodiment, the self-healing module includes a line self-healing system, a line detection system, and a fault alarm unit, and the line detection system includes a detection data comparison unit, a branch detection unit, and a bus detection unit. The unit and the backup line periodic detection unit, and the output ends of the branch circuit detection unit, the bus line detection unit and the backup line periodic detection unit are all connected with the input end of the detection data comparison unit.

In this embodiment, the fault alarm unit includes a wireless communication module, a Beidou positioning module, a fault data uploading module and a line area number uploading module. The output end of the line area number uploading module is connected to the input end of the fault data uploading module. The output ends of the data uploading module and Beidou positioning module are connected to the input end of the wireless communication module. The line self-healing system is connected to the distribution network in two directions. The output end of the line detection system is connected to the line self-healing system, the distribution network and the fault. The input end of the alarm unit is connected, and the output end of the human-computer interaction interface is connected with the input end of the line self-healing system.

In this embodiment, the line self-healing system includes a line prediction and analysis system, a risk assessment system, and a multi-line transfer system, and the line prediction and analysis system includes a transfer amount estimation unit, a transfer amount peak output module, an actual transfer amount Quantity comparison unit, comparative information feedback unit, difference intelligent analysis system and actual transfer value peak input module, the output end of the transfer value estimation unit is connected with the input end of the transfer value peak output module, the transfer value peak output module and the actual transfer value The output terminals of the peak input module are all connected with the input terminal of the actual transfer quantity comparison unit, the output terminal of the actual transfer quantity comparison unit is connected with the input terminal of the comparison information feedback unit, and the output terminal of the comparison information feedback unit is connected with the difference value intelligent analysis system. The input terminal is connected. By setting up the line estimation and analysis system, the current in each circuit can be detected during the current distribution and transfer process. The stability of the circuit can be judged by detecting the toggle of the current, and the existing problems in the circuit can be found in advance. , easy to stop in time, can solve hidden circuit problems, and can record and analyze, so that the staff can easily grasp the fault cause and general area of the problem circuit.

In this embodiment, the multi-line transfer system includes a transfer ratio adjustment system, a line early warning unit and a line current fluctuation monitoring unit, the output end of the line current fluctuation monitoring unit is connected to the input end of the line early warning unit, and the output end of the line early warning unit is connected The terminal is connected with the input terminal of the transfer ratio adjustment system. The transfer ratio adjustment system includes the transfer ratio input module, the total voltage distribution adjustment component and the branch voltage distribution adjustment component. The output terminal of the transfer ratio input module and the total voltage distribution adjustment component The input terminal Connection, the output end of the total voltage distribution adjustment component is connected with the input end of the normal circuit and the branch voltage distribution adjustment component respectively, the output end of the branch voltage distribution adjustment component is connected with the input end of the standby circuit, and the multi-line transfer system is respectively connected with the line Bi-directional connectivity between estimation and analysis systems, risk assessment systems and distribution grids.

In this embodiment, the risk assessment system includes a risk display module, an operation pre-judgment unit, a circuit simulation system, a risk feedback module, a fault line statistics module, and a data entry module. The output end of the data entry module is connected to the fault line statistics module. The input end is connected, the output end of the fault line statistics module is connected with the input end of the operation prediction unit, the output end of the operation prediction unit is connected with the input end of the risk display module, and the output end of the risk display module is connected with the input end of the circuit simulation system The output terminal of the circuit simulation system is respectively connected with the input terminal of the operation pre-judgment unit and the risk feedback module. The operation risk assessment system can simulate the operation state of the overall circuit according to the parameters of each circuit after the current distribution, which is convenient for manual inspection and participation in control. And it can make predictions according to the rules, which is convenient for the staff to find problems in advance, stop and adjust the current distribution in time, and combine artificial intelligence analysis and processing to ensure the safety of the circuit.

In this embodiment, the power distribution network includes a normal circuit, a fault circuit and a backup circuit, and the circuit is detected by setting a line detection system. When a fault occurs, the line self-healing system can be activated, and the line in the line self-healing system is estimated. The and analysis system can intelligently analyze the treatment plan according to the severity of the fault, and use the multi-line transfer system to distribute part of the current of the normal circuit to the backup circuit, and use the risk assessment system to judge the normal circuit and the backup circuit after the current is allocated. The safety of the respective circuits, the reasonable adjustment of the distribution ratio, try to avoid the recurrence of circuit failures without affecting the use, and effectively ensure the normal operation of the circuit.

During the normal operation of the circuit of the present invention, the line detection system detects the line in real time, the bus line detection unit detects the current and voltage of the circuit bus, the branch circuit detection unit is responsible for detecting the branch circuit, and transmits the detection data to the detection data comparison unit and the standard The thresholds are compared. When the compared value exceeds the standard threshold range, it means that the circuit is faulty, and the fault alarm unit will give an alarm. The line area number upload module will upload the number of the area circuit and the detection data of the fault and the location of the location. The information is uniformly uploaded to the remote terminal through the wireless communication module to notify the staff. At the same time, the circuit in the faulty area is disconnected, and the standby circuit is connected to the circuit system to replace the faulty circuit. The transfer amount estimation unit outputs the ratio set in advance through the transfer amount peak output module, and the total voltage distribution adjustment component adjusts the normal circuit. Part of the current is transferred to the backup circuit, and then the total current of the backup circuit is subdivided into different branches through the branch voltage distribution adjustment component, and then continues to detect the data of the circuit. After the current is distributed, the data entry module uploads the detection data to the risk assessment system, and the fault line statistics module makes statistics on parameters such as the range and number of fault lines, and then transmits the values to the operation pre-judgment unit for operation. The pre-judgment unit combines with the circuit. The simulation system establishes an analog circuit, and makes predictions according to the fluctuation law of the detection data, and uses the risk display module to display the possible circuit risks in the circuit simulation system by color. The transfer ratio adjustment system of the system intelligently increases and decreases the adjustment ratio. At the same time, the line current fluctuation monitoring unit synchronously detects the actual fluctuation value of the current. When the fluctuation is large, the line early warning unit gives an early warning. The transfer ratio adjustment system intelligently increases and decreases the adjustment ratio; circuit simulation The operation is displayed on the human-computer interaction interface, and the adjustment operation is carried out by manual cooperation with the system. After the distribution transfer current is stable, the actual transfer amount peak input module transmits the actual ratio to the actual transfer amount comparison unit, the actual transfer amount comparison unit compares it with the value set in advance by the system, and the comparison information feedback unit evaluates the difference between them. Feedback is carried out, and the possible hidden problems of the line are intelligently analyzed by the difference intelligent analysis system.

It can be seen from the above description that, compared with the prior art, the beneficial effects of the present invention are: the present invention can simulate the running state of the overall circuit, facilitate manual inspection and participation in control, and can predict according to the rules, which is convenient for staff to find problems in advance , to stop and adjust the current distribution in time, artificially combined with intelligent analysis and processing, to ensure the safety of the circuit; the invention realizes the purpose of fault protection for the distribution network by detecting the voltage, current and temperature data, and is an intelligent solution for the distribution network. Lay the foundation for technological development.

The above disclosures are only the preferred embodiments of the present invention, and of course, the scope of the rights of the present invention cannot be limited by this. Therefore, the equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims (10)

1. an intelligent distribution network differential protection and self-healing system, is characterized in that, comprises: A circuit breaker for disconnecting fault currents located on the boundary of each regional power grid of the distribution network, each of the circuit breakers is equipped with a protection measurement and control device, and the protection measurement and control device is connected with the self-healing module; the protection The measurement and control device includes a DSP processing unit, the signal output end of the DSP processing unit is connected with the signal input end of the actuator, the signal output end of the actuator is connected with the control signal input end of the action mechanism of the circuit breaker, and the signal output end of the DSP processing unit is connected with the signal input end of the actuator. The output and input ends are connected with the signal input and output ends of the storage unit, the signal input end of the DSP processing unit is connected with the signal output end of the analog-to-digital conversion unit, and the signal input end of the analog-to-digital conversion unit is connected with the sensor unit connected to the signal output. 2 . The intelligent distribution network differential protection and self-healing system according to claim 1 , wherein the sensor unit comprises a load voltage sensor, a load current sensor, a leakage current sensor and a temperature sensor, which respectively realize the control of load voltage, Load current, leakage current and temperature of distribution switchgear are detected, and raw signals are provided for power factor calculation of phase angle difference detection unit, switchgear fault monitoring and electrical load prediction of DSP processing unit; load voltage sensor, load current sensor, leakage Both the current sensor and the temperature sensor are connected to the analog-to-digital conversion unit. 3. The intelligent distribution network differential protection and self-healing system according to claim 1, wherein the protection measurement and control device further comprises a first analog quantity acquisition module, a second analog quantity acquisition module, a switch quantity acquisition module, The first differential protection module, the second differential protection module, the single-chip microcomputer and the Ethernet interface circuit, the first analog quantity acquisition module, the second analog quantity acquisition module, the switch quantity acquisition module, the first differential protection module and the third The two differential protection modules are respectively connected with the DSP processing unit, the DSP processing unit is connected with the single-chip microcomputer through the CAN bus, and the single-chip computer is communicated with the communication relay through the Ethernet interface circuit. 4. The intelligent distribution network differential protection and self-healing system according to claim 3, wherein the first analog quantity acquisition module comprises a first current sensor, a first voltage a transformer, a first low-pass filter and a first A/D converter, the output ends of the first current sensor and the first voltage transformer are respectively connected with the input end of the first low-pass filter, the first The output of the low-pass filter is connected to the processor through the first A/D converter. 5. The intelligent distribution network differential protection and self-healing system according to claim 3, wherein the second analog quantity acquisition module comprises a second current sensor, a second voltage a transformer, a second low-pass filter and a second A/D converter, the output ends of the second current sensor and the second voltage transformer are respectively connected with the input end of the second low-pass filter, the second The output of the low-pass filter is connected to the processor through a second A/D converter. 6. The intelligent distribution network differential protection and self-healing system according to claim 1, wherein the self-healing module comprises a line self-healing system, a power distribution network, a line detection system and a fault alarm unit, and the line detection system It includes a detection data comparison unit, a branch detection unit, a bus line detection unit and a backup line periodic detection unit. . 7. The intelligent distribution network differential protection and self-healing system according to claim 6, wherein the fault alarm unit comprises a wireless communication module, a Beidou positioning module, a fault data uploading module and a line area number uploading module. The output end of the area number uploading module is connected with the input end of the fault data uploading module. The output ends of the fault data uploading module and Beidou positioning module are both connected with the input end of the wireless communication module. The line self-healing system is connected to the power distribution network in both directions. The output end of the line detection system is respectively connected with the input end of the line self-healing system, the distribution network and the fault alarm unit, and the output end of the man-machine interface is connected with the input end of the line self-healing system. 8. The intelligent distribution network differential protection and self-healing system according to claim 6, wherein the line self-healing system comprises a line estimation and analysis system, a risk assessment system and a multi-line transfer system, and the line estimates The and analysis system includes a transfer amount estimation unit, a transfer amount peak output module, an actual transfer amount comparison unit, a comparison information feedback unit, a difference intelligent analysis system and an actual transfer amount peak input module. The input terminal of the peak output module is connected. 9 . The intelligent distribution network differential protection and self-healing system according to claim 8 , wherein the multi-line transfer system comprises a transfer ratio adjustment system, a line early warning unit and a line current fluctuation monitoring unit, which monitors the line current fluctuation. 10 . The output end of the unit is connected with the input end of the line early warning unit, and the output end of the line early warning unit is connected with the input end of the transfer ratio adjustment system. The transfer ratio adjustment system includes the transfer ratio input module, the total voltage distribution adjustment component and the branch voltage distribution adjustment. component, the output end of the transfer ratio input module is connected with the input end of the total voltage distribution adjustment component, the output end of the total voltage distribution adjustment component is respectively connected with the input end of the normal circuit and the branch voltage distribution adjustment component, and the branch voltage distribution adjustment component The output end of the circuit is connected to the input end of the standby circuit, and the multi-line transfer system is respectively connected to the line prediction and analysis system, the risk assessment system and the distribution network in two directions. 10. The intelligent distribution network differential protection and self-healing system according to claim 8, wherein the risk assessment system comprises a risk display module, an operation pre-judgment unit, a circuit simulation system, a risk feedback module, and fault line statistics. module and data entry module, the output end of the data entry module is connected with the input end of the fault line statistics module, the output end of the fault line statistics module is connected with the input end of the operation prediction unit, and the output end of the operation prediction unit is connected with the risk display module The input end of the risk display module is connected to the input end of the circuit simulation system, and the output end of the circuit simulation system is respectively connected to the input end of the operation prediction unit and the risk feedback module.

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