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

Differential protection and self-healing system for intelligent distribution network Download PDF

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Publication number
CN115051333A
CN115051333A CN202210635342.5A CN202210635342A CN115051333A CN 115051333 A CN115051333 A CN 115051333A CN 202210635342 A CN202210635342 A CN 202210635342A CN 115051333 A CN115051333 A CN 115051333A
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China
Prior art keywords
module
line
unit
output end
self
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CN202210635342.5A
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Inventor
黄福全
王廷凰
刘子俊
乔峰
徐骏
胡佳新
郭乐欣
周建勇
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Shenzhen Power Supply Bureau Co Ltd
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Shenzhen Power Supply Bureau Co Ltd
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Priority to CN202210635342.5A priority Critical patent/CN115051333A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/06Details with automatic reconnection
    • H02H3/066Reconnection being a consequence of eliminating the fault which caused disconnection
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

Abstract

The invention discloses a differential protection and self-healing system of an intelligent distribution network, which comprises circuit breakers, a protection and measurement and control device and a self-healing module, wherein the circuit breakers are positioned on the range boundary of each regional power grid of the distribution network and used for breaking fault current; the invention realizes the purpose of fault protection of the power distribution network by detecting the voltage, current and temperature data.

Description

Differential protection and self-healing system for intelligent distribution network
Technical Field
The invention belongs to the technical field of power distribution network protection, and particularly relates to an intelligent distribution network differential protection and self-healing system.
Background
With the development of social economy and the large application of high-tech digital equipment, the economic loss and adverse effect on society caused by power supply interruption and unqualified power quality are increasing, and the requirement of users on the power supply quality is also increasing. The method has the advantages that the fault point of the power distribution network is accurately positioned, the fault point is quickly isolated, and the load power supply of the non-fault section is recovered, so that the method is an important means for improving the power supply reliability of the power distribution network.
On one hand, the existing differential protection system is not suitable for circuit breakers far away from each other in a power distribution network and is not suitable for power distribution network application with larger uncertainty of a network topology running state, and the logic of a conventional differential protection direct tripping circuit breaker and a fault point direct connection circuit breaker cannot meet the problem of meeting the application requirements of a switching power distribution network; on the other hand, the self-healing of the existing power grid is generally only to break the circuit at a certain area after a single circuit fails, the current is completely transferred to other circuits, the current and voltage of other circuits can be increased at the moment, the old loss degree of some circuits is different, statistics cannot be carried out in the problem systems, if the circuit with the large old loss degree is connected with large current, the circuit can be damaged again, and larger circuit faults are caused.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an intelligent distribution network differential protection and self-healing system to improve the fault protection level of a distribution network.
In order to solve the technical problem, the invention provides an intelligent distribution network differential protection and self-healing system, which comprises:
the circuit breakers are positioned on the boundary of the range of each regional power grid of the power distribution network and used for breaking fault current, each circuit breaker is provided with a protection measurement and control device, and the protection measurement and control devices are connected with the self-healing module; the protection measurement and control device comprises a DSP processing unit, wherein a signal output end of the DSP processing unit is connected with a signal input end of an actuating mechanism, a signal output end of the actuating mechanism is connected with a control signal input end of an action mechanism of a circuit breaker, a signal output end and an input end of the DSP processing unit are connected with a signal input end and an output end of a storage unit, a signal input end of the DSP processing unit is connected with a signal output end of an analog-to-digital conversion unit, and a signal input end of the analog-to-digital conversion unit is connected with a signal output end of a sensor unit.
Furthermore, the sensor unit comprises a load voltage sensor, a load current sensor, a leakage current sensor and a temperature sensor, the load voltage, the load current, the leakage current and the temperature of the distribution switch cabinet are respectively detected, and original signals are provided for power factor calculation of the phase angle difference detection unit, fault monitoring of the DSP processing unit switch cabinet and electric load prediction; the load voltage sensor, the load current sensor, the leakage current sensor and the 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 switching quantity acquisition module, a first differential protection module, a second differential protection module, a single chip microcomputer and an Ethernet interface circuit, wherein the first analog quantity acquisition module, the second analog quantity acquisition module, the switching quantity acquisition module, the first differential protection module and the second differential protection module are respectively connected with the DSP processing unit, the DSP processing unit is connected with the single chip microcomputer through a CAN bus, and the single chip microcomputer is in communication connection with a communication transfer machine through the Ethernet interface circuit
Furthermore, the first analog quantity acquisition module comprises a first current sensor, a first voltage transformer, a first low-pass filter and a first A/D converter which are arranged on a 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 with the processor through the first A/D converter.
Furthermore, the second analog quantity acquisition module comprises a second current sensor, a second voltage transformer, a second low-pass filter and a second A/D converter, the second current sensor, the second voltage transformer, the second low-pass filter and the second A/D converter are arranged on a line where the load switch is located, output ends of the second current sensor and the second voltage transformer are respectively connected with an input end of the second low-pass filter, and an output end of the second low-pass filter is connected with the processor through the second A/D converter.
Further, the self-healing module includes circuit self-healing system, distribution network, line detection system and fault alarm unit, and line detection system is including detecting data contrast unit, branch road detecting element, total line detecting element and reserve line periodic detection unit, and branch road detecting element, total line detecting element and reserve line periodic detection unit's output all is connected with the input that detects data contrast unit.
Further, the fault alarm unit includes wireless communication module, big dipper orientation module, fault data upload module and circuit area serial number upload module, the output of circuit area serial number upload module is connected with the input of fault data upload module, fault data upload module and big dipper orientation module's output all is connected with wireless communication module's input, circuit self-healing system realizes two-way connection with the distribution network, line detecting system's output respectively with circuit self-healing system, the input of distribution network and fault alarm unit is connected, human-computer interaction interface's output and circuit self-healing system's input are connected.
Further, the line self-healing system comprises a line pre-estimation and analysis system, a risk evaluation system and a multi-line transfer system, the line pre-estimation and analysis system comprises a transfer amount pre-estimation unit, a transfer amount peak value output module, an actual transfer amount comparison unit, a comparison information feedback unit, a difference intelligent analysis system and an actual transfer amount peak value input module, and the output end of the transfer amount pre-estimation unit is connected with the input end of the transfer amount peak value output module.
Further, the multi-line transfer system comprises a transfer proportion adjusting system, a line early warning unit and a line current fluctuation monitoring unit, wherein the output end of the line current fluctuation monitoring unit is connected with the input end of the line early warning unit, the output end of the line early warning unit is connected with the input end of the transfer proportion adjusting system, the transfer proportion adjusting system comprises a transfer proportion inputting module, the output end of the transfer proportion input module is connected with the input end of the total voltage distribution regulating assembly, the output end of the total voltage distribution regulating assembly is connected with the input ends of the normal circuit and the branch voltage distribution regulating assembly respectively, the output end of the branch voltage distribution regulating assembly is connected with the input end of the standby circuit, and the multi-line transfer system is in bidirectional connection with the line prediction and analysis system, the risk assessment system and the power distribution network respectively.
Furthermore, the risk assessment system comprises a risk display module, an operation prejudgment unit, a circuit simulation system, a risk feedback module, a fault line statistics module and a data entry module, wherein 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 prejudgment unit, the output end of the operation prejudgment 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 output end of the circuit simulation system is respectively connected with the input ends of the operation prejudgment unit and the risk feedback module.
The implementation of the invention has the following beneficial effects: the invention can simulate the running state of the whole circuit, is convenient for manual check and participation control, can carry out prejudgment according to the rule, is convenient for the working personnel to find problems in advance, and stop and adjust the distribution of current in time, and ensures the safety of the circuit by combining the manual work with the intelligent analysis and processing; the invention realizes the purpose of fault protection of the power distribution network by detecting the voltage, current and temperature data, and lays a foundation for the intelligent technical development of the power distribution network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a differential protection and self-healing system of an intelligent distribution network according to an embodiment of the present invention.
Fig. 2 is a block diagram of a self-healing system of a line according to an embodiment of the present invention.
Fig. 3 is a block diagram of a line detection system according to an embodiment of the present invention.
Fig. 4 is a block diagram of a circuit prediction and analysis system according to an embodiment of the present invention.
Fig. 5 is a block diagram of a fault alarm unit according to an embodiment of the present invention.
Fig. 6 is a block diagram of a risk assessment system according to an embodiment of the present invention.
Fig. 7 is a block diagram of a multi-line transfer system according to an embodiment of the present invention.
Fig. 8 is a block diagram of a transfer ratio adjustment system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included 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:
the circuit breakers are positioned on the boundary of the range of each regional power grid of the power distribution network and used for breaking fault current, each circuit breaker is provided with a protection measurement and control device, and the protection measurement and control devices are connected with the self-healing modules; the protection measurement and control device comprises a DSP processing unit, wherein a signal output end of the DSP processing unit is connected with a signal input end of an actuating mechanism, a signal output end of the actuating mechanism is connected with a control signal input end of an action mechanism of a circuit breaker, a signal output end and an input end of the DSP processing unit are connected with a signal input end and an output end of a storage unit, a signal input end of the DSP processing unit is connected with a signal output end of an analog-to-digital conversion unit, and a signal input end of the analog-to-digital conversion unit is connected with a signal output end of a sensor unit.
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, the load current, the leakage current and the temperature of the distribution switchgear, and provide raw signals for the power factor calculation of the phase angle difference detection unit, the fault monitoring of the DSP processing unit switchgear and the electrical load prediction; the load voltage sensor, the load current sensor, the leakage current sensor and the temperature sensor are all connected to the analog-to-digital conversion unit.
In this embodiment, protection measurement and control device still includes first analog quantity acquisition module, second analog quantity acquisition module, switching value acquisition module, first differential protection module, the differential protection module of second, singlechip and ethernet interface circuit, first analog quantity acquisition module, second analog quantity acquisition module, switching value acquisition module, first differential protection module and the differential protection module of second are connected with DSP processing unit respectively, DSP processing unit passes through the CAN bus and is connected with the singlechip, the singlechip passes through ethernet interface circuit and is connected with communication transfer machine communication.
In this embodiment, the first analog quantity acquisition module is configured to acquire a line current and a line voltage of a line on which the circuit breaker is located, and transmit current and voltage data to the DSP processing unit; the second analog quantity acquisition module is used for acquiring the line current and voltage of the line where the load switch is located and transmitting the current and voltage data to the DSP processing unit; the switching value acquisition module is used for acquiring the on-off state of the circuit breaker and the load switch and transmitting corresponding signals to the DSP processing unit; the first differential protection module is used for receiving the control signal sent by the main control module and controlling the on-off state of the circuit breaker; and the second differential protection module is used for receiving the control signal sent by the main control module and controlling the on-off state of the load switch.
In this embodiment, the DSP processing unit is configured to receive a current and a voltage of a line where the circuit breaker is located, and a current and a voltage of a line where the load switch is located, perform real-time data interaction with the single chip microcomputer, where the single chip microcomputer transmits the received data to the communication relay, and at the same time, receives voltage and current protection data sent by the communication relay, and transmits the voltage and current protection data to the DSP processing unit, and the DSP processing unit compares the sampled voltage and current data with the voltage and current protection data to determine whether a differential current protection criterion is satisfied, and if the criterion condition is satisfied, controls the circuit breaker to be in a trip-off state through the first differential protection module, and after completing an action of tripping the circuit breaker, controls the load switch to be in the trip-off state through the second differential protection module if a current at the load switch is lower than a rated current, so as to implement differential protection of the line.
In this embodiment, the communication transfer machine includes a plurality of WEB servers disposed in the power networks of the respective regions, and actively acquires data provided by the protection measurement and control terminals in the power networks of the respective regions of the power distribution network through each WEB server, and transmits the acquired data to the monitoring master station, and receives voltage and current protection data transmitted by the monitoring master station; the monitoring master station comprises cloud servers, and the cloud servers collect the data provided by each protection measurement and control terminal and send the voltage and current protection data 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 that are arranged on a line where the circuit breaker is located, output terminals of the first current sensor and the first voltage transformer are respectively connected with an input terminal of the first low-pass filter, and an output terminal of the first low-pass filter is connected with the processor through the first a/D converter.
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 which are arranged on a line where the load switch is located, output ends of the second current sensor and the second voltage transformer are respectively connected with an input end of the second low-pass filter, and an output end of the second low-pass filter is connected with the processor through the second a/D converter.
In this embodiment, the first differential protection module is connected to a control circuit of the circuit breaker, and the first differential protection module sends a trip signal to control an on/off state of the circuit breaker. The second differential protection module is connected with a control loop of the load switch, and the second differential protection module sends a tripping signal to control the on-off state of the load switch. And the first differential protection module and the second differential protection module respectively adopt a protection processor.
In this embodiment, the protection measurement and control terminal further includes a human-computer interaction module, the human-computer interaction module is connected with the DSP processing unit, and the human-computer interaction module includes a touch screen and an operation entity key.
As shown in fig. 2 to 8, in this embodiment, the self-healing module includes a line self-healing system, a line detection system and a fault alarm unit, the line detection system includes a detection data comparison unit, a branch detection unit, a bus detection unit and a spare line periodic detection unit, and output ends of the branch detection unit, the bus detection unit and the spare line periodic detection unit are all connected to an input end of the detection data comparison unit.
In this embodiment, the fault alarm unit includes wireless communication module, big dipper orientation module, fault data upload module and circuit area serial number upload module, the output of circuit area serial number upload module is connected with the input of fault data upload module, fault data upload module and big dipper orientation module's output all is connected with wireless communication module's input, circuit self-healing system realizes two way connection with the distribution network, line detecting system's output respectively with circuit self-healing system, the input of distribution network and fault alarm unit is connected, human-computer interaction interface's output and circuit self-healing system's input are connected.
In this embodiment, the self-healing line system includes a line estimation and analysis system, a risk evaluation system and a multi-line transfer system, the line estimation 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, an output end of the transfer amount estimation unit is connected with an input end of the transfer amount peak output module, output ends of the transfer amount peak output module and the actual transfer amount peak input module are both connected with an input end of the actual transfer amount comparison unit, an output end of the actual transfer amount comparison unit is connected with an input end of the comparison information feedback unit, an output end of the comparison information feedback unit is connected with an input end of the difference intelligent analysis system, and by setting 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 is judged by shifting the detection current, so that the problems existing in the circuit can be found in advance, the circuit can be stopped conveniently and timely, the hidden circuit problem can be solved, and the recording and analysis can be carried out, so that a worker can conveniently master the fault reason and the approximate area of the circuit with the problems.
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, an output end of the line current fluctuation monitoring unit is connected to an input end of the line early warning unit, an output end of the line early warning unit is connected to an input end of the transfer ratio adjustment system, the transfer ratio adjustment system includes a transfer ratio entry module, the output end of the transfer proportion input module is connected with the input end of the total voltage distribution regulating assembly, the output end of the total voltage distribution regulating assembly is connected with the input ends of the normal circuit and the branch voltage distribution regulating assembly respectively, the output end of the branch voltage distribution regulating assembly is connected with the input end of the standby circuit, and the multi-line transfer system is in bidirectional connection with the line prediction and analysis system, the risk assessment system and the power distribution network respectively.
In this embodiment, the risk assessment system includes a risk display module, an operation pre-judging unit, a circuit simulation system, a risk feedback module, a fault line statistical module and a data entry module, an output end of the data entry module is connected with an input end of the fault line statistical module, an output end of the fault line statistical module is connected with an input end of the operation pre-judging unit, an output end of the operation pre-judging unit is connected with an input end of the risk display module, an output end of the risk display module is connected with an input end of the circuit simulation system, an output end of the circuit simulation system is respectively connected with input ends of the operation pre-judging unit and the risk feedback module, the operation risk assessment system can simulate an operation state of the whole circuit according to parameters of each circuit after current distribution, so as to facilitate manual check and participation control, perform pre-judgment according to rules, and facilitate workers to find problems in advance, and the distribution of current is stopped and adjusted in time, the safety of the circuit is ensured by combining the manual work with the intelligent analysis and processing,
in this embodiment, the distribution network includes normal circuit, fault circuit and stand-by circuit, come detection circuitry through setting up line detection system, can start line self-healing system when breaking down, line in the line self-healing system is estimated and analytic system can be according to the severity intelligent analysis processing scheme of trouble, and utilize many lines transfer system with the partial current distribution of normal circuit to the stand-by circuit, and utilize the security of the circuit respectively after the risk assessment system can judge normal circuit and stand-by circuit distributes good current, reasonable adjustment distribution proportion, avoid circuit fault appearing again under the condition that does not influence the use as far as possible, the effectual normal work who guarantees the circuit.
In the normal working process of the circuit, the circuit detection system detects the circuit in real time, the main circuit detection unit detects the current and voltage of the main circuit of the circuit, the branch detection unit is responsible for detecting branches and transmitting detection data to the detection data comparison unit to be compared with a standard threshold value, when the compared value exceeds the range of the standard threshold value, the circuit is in fault, the fault alarm unit alarms, and the line area number uploading module uploads the number of the area circuit, the detection data of the fault and the positioning position information to the remote terminal through the wireless communication module in a unified mode to inform a worker. The circuit of the fault area is disconnected while alarming, the standby circuit is connected to the circuit system to replace the fault circuit, the transfer quantity pre-estimation unit outputs a preset proportion through the transfer quantity peak value output module, partial current of the normal circuit is transferred to the standby circuit through the total voltage distribution adjusting assembly, then the total current of the standby circuit is subdivided to different branches through the branch voltage distribution adjusting assembly, and then the data of the circuit is continuously detected. After current distribution, a data input module uploads detection data to a risk evaluation system, a fault line counting module counts parameters such as the range and the number of fault lines, the parameters are transmitted to an operation pre-judging unit to operate, the pre-judging unit is combined with a circuit simulation system to establish a simulation circuit, pre-judging is carried out according to the fluctuation rule of the detection data, a risk display module is used for displaying possible circuit risks in the circuit simulation system in colors, a risk feedback module feeds back the risk problem, a transfer proportion adjusting system of a multi-line transfer system intelligently increases and decreases an adjusting proportion, a line current fluctuation monitoring unit synchronously detects the actual fluctuation value of current, early warning is carried out through a line early warning unit when the fluctuation is large, and the transfer proportion adjusting system intelligently increases and decreases the adjusting proportion; the circuit simulation operation is displayed on a human-computer interaction interface, and the manual matching system is used for carrying out adjustment operation. After the distributed transfer current is stable, the actual transfer amount peak value input module transmits the actual proportion to the actual transfer amount comparison unit, the actual transfer amount comparison unit compares the actual transfer amount peak value input module with a numerical value set in advance by the system, the comparison information feedback unit feeds back a difference value, and the difference value intelligent analysis system intelligently analyzes a possible line hiding problem.
As can be seen from the above description, compared with the prior art, the beneficial effects of the present invention are as follows: the invention can simulate the running state of the whole circuit, is convenient for manual check and participation control, can carry out prejudgment according to the rule, is convenient for the working personnel to find problems in advance, and stop and adjust the distribution of current in time, and ensures the safety of the circuit by combining the manual work with the intelligent analysis and processing; the invention realizes the purpose of fault protection of the power distribution network by detecting the voltage, the current and the temperature data, and lays a foundation for the intelligent technical development of the power distribution network.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. The utility model provides an intelligent distribution network differential protection and self-healing system which characterized in that includes:
the circuit breakers are positioned on the boundary of the range of each regional power grid of the power distribution network and used for breaking fault current, each circuit breaker is provided with a protection measurement and control device, and the protection measurement and control devices are connected with the self-healing module; the protection measurement and control device comprises a DSP processing unit, wherein a signal output end of the DSP processing unit is connected with a signal input end of an actuating mechanism, a signal output end of the actuating mechanism is connected with a control signal input end of an action mechanism of a circuit breaker, a signal output end and an input end of the DSP processing unit are connected with a signal input end and an output end of a storage unit, a signal input end of the DSP processing unit is connected with a signal output end of an analog-to-digital conversion unit, and a signal input end of the analog-to-digital conversion unit is connected with a signal output end of a sensor unit.
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, and is configured to detect the load voltage, the load current, the leakage current and the temperature of the distribution switchgear, and provide raw signals for power factor calculation of the phase angle difference detection unit, fault monitoring of the DSP processing unit switchgear and electrical load prediction; the load voltage sensor, the load current sensor, the leakage current sensor and the temperature sensor are all 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 switching 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 switching quantity acquisition module, the first differential protection module and the second differential protection module are respectively connected with the DSP processing unit, the DSP processing unit is connected with the single chip microcomputer through a CAN bus, and the single chip microcomputer is in communication connection with the communication transfer machine through the ethernet interface circuit.
4. The differential protection and self-healing system for the intelligent distribution network according to claim 3, wherein the first analog acquisition module comprises a first current sensor, a first voltage transformer, a first low-pass filter and a first A/D converter which are arranged on a line where the breaker is located, output ends of the first current sensor and the first voltage transformer are respectively connected with an input end of the first low-pass filter, and an output end of the first low-pass filter is connected with 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 includes a second current sensor, a second voltage transformer, a second low-pass filter and a second A/D converter, the second current sensor, the second voltage transformer, the second low-pass filter and the second A/D converter are disposed on a line where the load switch is disposed, output ends of the second current sensor and the second voltage transformer are respectively connected with an input end of the second low-pass filter, and an output end of the second low-pass filter is connected with the processor through the 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 distribution network, a line detection system and a fault alarm unit, the line detection system comprises a detection data comparison unit, a branch detection unit, a bus line detection unit and a standby line periodic detection unit, and output ends of the branch detection unit, the bus line detection unit and the standby line periodic detection unit are connected with an input end of the detection data comparison 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, an output end of the line area number uploading module is connected with an input end of the fault data uploading module, output ends of the fault data uploading module and the Beidou positioning module are connected with an input end of the wireless communication module, the line self-healing system is in bidirectional connection with the power distribution network, an output end of the line detection system is connected with input ends of the line self-healing system, the power distribution network and the fault alarm unit respectively, and an output end of the human-computer interaction interface is connected with an input end of the line self-healing system.
8. The differential protection and self-healing system for the intelligent distribution network according to claim 6, wherein the line self-healing system comprises a line pre-estimation and analysis system, a risk assessment system and a multi-line transfer system, the line pre-estimation and analysis system comprises a transfer amount pre-estimation unit, a transfer amount peak value output module, an actual transfer amount comparison unit, a comparison information feedback unit, a difference intelligent analysis system and an actual transfer amount peak value input module, and an output end of the transfer amount pre-estimation unit is connected with an input end of the transfer amount peak value output module.
9. The differential protection and self-healing system for the intelligent distribution network according to claim 8, wherein the multi-line transfer system comprises a transfer ratio adjustment system, a line pre-warning unit and a line current fluctuation monitoring unit, an output end of the line current fluctuation monitoring unit is connected with an input end of the line pre-warning unit, an output end of the line pre-warning unit is connected with an input end of the transfer ratio adjustment system, the transfer ratio adjustment system comprises a transfer ratio entry module, a total voltage distribution adjustment assembly and a branch voltage distribution adjustment assembly, an output end of the transfer ratio entry module is connected with an input end of the total voltage distribution adjustment assembly, an output end of the total voltage distribution adjustment assembly is respectively connected with input ends of a normal circuit and the branch voltage distribution adjustment assembly, an output end of the branch voltage distribution adjustment assembly is connected with an input end of a standby circuit, and the multi-line transfer system is respectively in bidirectional connection with the line estimation and analysis system, the risk evaluation system and the power distribution network.
10. The differential protection and self-healing system for the intelligent distribution network 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, a fault line statistics module and a data entry module, an output end of the data entry module is connected with an input end of the fault line statistics module, an output end of the fault line statistics module is connected with an input end of the operation pre-judgment unit, an output end of the operation pre-judgment unit is connected with an input end of the risk display module, an output end of the risk display module is connected with an input end of the circuit simulation system, and an output end of the circuit simulation system is connected with input ends of the operation pre-judgment unit and the risk feedback module respectively.
CN202210635342.5A 2022-06-07 2022-06-07 Differential protection and self-healing system for intelligent distribution network Pending CN115051333A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115808643A (en) * 2023-02-06 2023-03-17 北京瑞阳伟业科技有限公司 Regulator cubicle function test platform with real-time data acquisition
CN116914759A (en) * 2023-09-11 2023-10-20 新乡市诺一达网络科技有限公司 Power distribution power supply system for electric power
CN116914759B (en) * 2023-09-11 2024-05-03 韶关市擎能设计有限公司 Power distribution power supply system for electric power

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115808643A (en) * 2023-02-06 2023-03-17 北京瑞阳伟业科技有限公司 Regulator cubicle function test platform with real-time data acquisition
CN115808643B (en) * 2023-02-06 2023-04-25 北京瑞阳伟业科技有限公司 Electrical cabinet function test board with real-time data acquisition function
CN116914759A (en) * 2023-09-11 2023-10-20 新乡市诺一达网络科技有限公司 Power distribution power supply system for electric power
CN116914759B (en) * 2023-09-11 2024-05-03 韶关市擎能设计有限公司 Power distribution power supply system for electric power

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