CN117118055A - Low-voltage distribution network safety protection detection control method and system - Google Patents
Low-voltage distribution network safety protection detection control method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS 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
- Y04S40/00—Systems 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
- Y04S40/12—Systems 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
- Y04S40/126—Systems 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 wireless data transmission
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Abstract
The application discloses a method and a system for detecting and controlling the safety protection of a low-voltage power distribution network, which relate to the technical field of low-voltage power distribution networks and comprise the steps of collecting equipment data and performing rationalization filtration; when the filtering condition is met, starting a rated load maximum temperature prediction algorithm to obtain a prediction result; setting a logic judging process, and controlling opening and closing of the intelligent circuit breaker; the system comprises a software system layer, a communication technology layer and a terminal hardware layer. The application realizes the protection control of the low-voltage distribution network transmission line and the equipment linkage control of on-line monitoring and on-site control; through the structural function design of three layers of a software system layer, a communication management layer and a terminal hardware layer, the on-site operation equipment can be monitored and controlled in real time, and the centralized management and control of data are facilitated.
Description
Technical Field
The application relates to the technical field of low-voltage distribution networks, in particular to a method and a system for detecting and controlling safety protection of a low-voltage distribution network.
Background
With the development of digital information technology, the power grid enterprises continuously push the construction, operation and production technology upgrading of the intelligent measurement and control universal terminal, take 'quality improvement and synergy' as the overall goal, develop the intelligent and integrated construction of the intelligent measurement and control universal terminal, fully exert the production element function of the data in the power transformation field, and powerfully support the upgrade of the digital power grid, the digital enterprises, the digital service and the digital industry. The intelligent measurement and control universal terminal can comprise various power grid sensors.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-mentioned and/or existing problems with the low-voltage power distribution network safety protection detection control method and system.
Therefore, the application aims to provide a method and a system for detecting and controlling the safety protection of a low-voltage power distribution network.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for controlling safety protection detection of a low-voltage power distribution network, where the method includes collecting device data by a sensor and rationally filtering the data; when the sensor data accords with the filtering condition, starting a rated load highest temperature prediction algorithm to obtain a prediction result; and setting a logic judgment process, judging according to the prediction result, and controlling the opening and closing of the intelligent circuit breaker.
As a preferable scheme of the low-voltage distribution network safety protection detection control method, the application comprises the following steps: the data comprises current data and temperature data; the filtering conditions include a reasonable range of temperature data: -20 ℃ to 199 ℃, and judging that the sensor data is abnormal when the sensor data exceeds the range; reasonable range of current data: and 0A-5000A, and judging that the sensor data is abnormal when the sensor data exceeds the range.
As a preferable scheme of the low-voltage distribution network safety protection detection control method, the application comprises the following steps: the rated load maximum temperature prediction algorithm formula is as follows:
wherein T is M T is the maximum temperature predicted value under rated load t At time tTemperature value of cable, T0 t For the temperature value of the sensor at the moment t, I t For the value of the current flowing through the cable at time t, I e Is the rated load of the intelligent circuit breaker.
As a preferable scheme of the low-voltage distribution network safety protection detection control method, the application comprises the following steps: the logic judgment process comprises that when 85 ℃ is less than T M When the temperature is less than 105 ℃, the system sends out an early warning signal, and the early warning signal and an intelligent breaker opening and closing state signal are wirelessly uploaded to system software through a low-voltage distribution network safety protector; when T is M When the temperature is more than 105 ℃, the system sends out an alarm signal, and the microprocessor MCU of the safety protector of the low-voltage distribution network sends out a switching value control signal through logic control to output and control the intelligent breaker module to perform switching-off operation; the alarm signal and the switch-on/off state signal of the intelligent breaker are wirelessly uploaded to system software through a low-voltage distribution network safety protector; after the intelligent breaker is opened, when T M When the temperature is less than 80 ℃ and exceeds 10 minutes, the MCU sends out a switching value control signal through logic control to output and control the intelligent breaker module to perform switching-on operation; and the switching-on and switching-off state signal of the intelligent circuit breaker is wirelessly uploaded to system software through the low-voltage distribution network safety protector.
In a second aspect, an embodiment of the present application provides a low-voltage power distribution network safety protection detection control system, including: the software system layer comprises a low-voltage distribution network safety protection detection control system background, wherein the background comprises a front-end display module, a data processing module, a rule engine module and a data storage module, wherein the front-end display module is used for displaying monitoring data and alarm information, the data processing module is used for carrying out real-time processing, analysis and diagnosis on the data, the rule engine module is used for defining and managing safety protection rules, and the data storage module is used for storing various data in a lasting mode; the communication technology layer comprises the steps of realizing multi-channel transmission of terminal data by adopting a wireless communication module, carrying out multi-point acquisition, and enabling a signal transmission channel after centralized summarization to be compatible with the existing centralized meter reading channel and enabling a data interaction system to be compatible; the terminal hardware layer comprises a sensor module and a low-voltage distribution network safety protector; the sensor module is an electricity consumption state sensing sensor, data information monitored by the sensor is uploaded to a low-voltage distribution network safety protector in a wireless mode, and multi-path electric quantity data, multi-point temperature monitoring information and multi-path user side electricity consumption state monitoring information are collected; the low-voltage distribution network safety protector comprises an information acquisition module, a DSP, an MCU, a data storage module, a GPRS communication module, a 4G communication module, a status indicator lamp, a 433 wireless communication module, an RS485 communication module, a switching value output end, a switching value input end, a door status signal lamp and an intelligent circuit breaker module
As a preferable scheme of the low-voltage distribution network safety protection detection control system, the application comprises the following steps: the work flow of the low-voltage power distribution network safety protection detection control system is as follows, the low-voltage power distribution network safety protection detection control system monitors incoming load and temperature of a surface area through a sensor module in a terminal hardware layer, and collects various operation data; the monitoring operation data is uploaded to the low-voltage power distribution network safety protector through a communication technology layer, namely, the sensor monitoring data is transmitted to a low-voltage power distribution network safety protection detection control system background of a software system layer through a 4G wireless communication module after being collected by the low-voltage power distribution network safety protector; and the data is transmitted to a background of a safety protection detection control system of the low-voltage distribution network, real-time monitoring and comprehensive analysis and evaluation of the surface area data are carried out, and the opening and closing of the intelligent circuit breaker are remotely controlled through a safety protection control function in the background.
As a preferable scheme of the low-voltage distribution network safety protection detection control system, the application comprises the following steps: the background of the low-voltage distribution network safety protection detection control system comprises a system framework adopting a C/S structure, namely a client/Server structure in system software, and storing various information data through a space database SQL Server, and browsing, editing, inquiring, outputting, modeling and analyzing the space data; the geographic information and other system data are dynamically and visually displayed and analyzed; the combination of the geographical location information and the electrical related parameters is applied to low voltage distribution user management.
As a preferable scheme of the low-voltage distribution network safety protection detection control system, the application comprises the following steps: the information acquisition module comprises data detected by an acquisition sensor, including electrical parameters, temperature, circuits, distribution transformer weight overload, user power failure information, fault abnormality warning, and abnormality acquisition information and monitoring information of a remote sensor; the MCU comprises a controller for controlling and managing the operation of the safety protector; the intelligent breaker module has overload, short circuit, residual current, open phase, overvoltage, undervoltage and zero-break protection functions and can automatically reclose; performing manual and electric opening and closing operations; the operating voltage, current and line residual current are detected.
In a third aspect, embodiments of the present application provide a computer apparatus comprising a memory and a processor, the memory storing a computer program, wherein: the processor, when executing the computer program, implements any of the steps of the method described above.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having a computer program stored thereon, wherein: which when executed by a processor performs any of the steps of the method described above.
The application has the beneficial effects that through the structural function design of three layers of a software system layer, a communication management layer and a terminal hardware layer, the real-time monitoring and control of on-site operation equipment can be realized, so that various functions such as data acquisition, map management, fault diagnosis, equipment control, measurement, parameter adjustment, various signal alarms and the like are realized; the detection method and the control method based on the geographic information can combine the geographic position information with the electrical related parameters according to the functional characteristics of the geographic information system, and are applied to low-voltage distribution user management, so that the management of a city-county-level power company in a low-voltage distribution network is facilitated. The advantage of the visual analysis management of the geographic information system is beneficial to the comprehensive management of the low-voltage distribution network in a complex environment, and the informatization level of the low-voltage distribution network is improved; according to the remote communication and control method based on 4G communication, each table area monitoring point can independently collect data and upload and gather the data in real time through 4G, so that the centralized management and control of the data are facilitated; based on the low-voltage distribution network safety protector, by designing a low-voltage distribution network safety protection detection control method, a rated load highest temperature prediction algorithm program is built in a microprocessor MCU of the low-voltage distribution network safety protector, and by judging a threshold value of a calculated value through current and temperature data monitored by a sensor, a control logic is set, so that a protection control function of a low-voltage distribution network transmission line can be realized. The device linkage control function of on-line monitoring and on-site control can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a flowchart of a method for controlling safety protection detection of a low-voltage distribution network.
FIG. 2 is a logical relationship diagram of a detection method and a control method based on geographic information.
Fig. 3 is a diagram of an overall hierarchical functional architecture of a low voltage distribution network safety protection detection control system.
Fig. 4 is a diagram showing a relationship between a low-voltage distribution network safety protection detection control system and an electricity utilization management subsystem.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, a first embodiment of the present application provides a method for controlling safety protection detection of a low-voltage power distribution network, including:
s1: the sensor collects current and temperature data.
S2: the original temperature data and the current data of the sensor are reasonably filtered, and the reasonable and normal monitoring data can be used for diagnosis calculation.
Specifically, rationalizing the filtration conditions: (1) reasonable range of temperature data: -20-199 ℃, and if the sensor data exceeds the threshold value, judging that the sensor data is abnormal; (2) reasonable range of current data: 0A-5000A, if the sensor data exceeds the threshold value, judging that the sensor data is abnormal;
s3: after the sensor data accords with the filtering condition, starting a rated load maximum temperature prediction algorithm, wherein the formula is as follows:
T M ＝(T t -T0 t )/I t 2 ×I e 2 +T0 t
wherein T is M T is the maximum temperature predicted value under rated load t For the temperature value of the cable at time T, T0 t For the temperature value of the sensor at the moment t, I t For the value of the current flowing through the cable at time t, I e Is the rated load of the intelligent circuit breaker. The selected temperature values Tt and T0T are temperatures of different positions in the same range of the monitored equipment, and the rated current value is brought into a relation model according to a load temperature rise theory, so that the highest temperature prediction of the power equipment in rated load can be obtained without adding other temperature measuring points.
S4: setting a logic judgment process, executing an algorithm, and judging according to the diagnosis value.
Specifically, the threshold value judging process: when the temperature is 85 DEG C<T M <And when the temperature is 105 ℃, an early warning signal is sent out, and the early warning signal and an intelligent breaker opening and closing state signal are wirelessly uploaded to system software through a low-voltage distribution network safety protector, so that background real-time checking can be performed.
When T is M >And when the temperature is 105 ℃, an alarm signal is sent out, and the MCU sends out a switching value control signal output to control the intelligent breaker module to perform switching-off operation through logic control. The alarm signal and the switch-on and switch-off state signal of the intelligent circuit breaker are wirelessly uploaded to system software through the low-voltage distribution network safety protector, and can be checked in real time in the background.
After the intelligent breaker is opened, when T M <When the temperature of 80 ℃ exceeds 10 minutes, the MCU sends out a switching value control signal through logic control to output and control the intelligent breaker module to perform closing operation. The intelligent breaker opening and closing state signals are wirelessly uploaded to system software through the low-voltage distribution network safety protector, and background real-time checking can be performed.
The threshold value setting accords with the application scene and the requirement of actual power equipment, and the background system can judge according to the actual condition, the early warning value and the alarm value, and can manually control the opening and closing of the intelligent circuit breaker in real time and remotely.
According to the application, by designing the low-voltage power distribution network safety protection detection control method, a rated load highest temperature prediction algorithm program is built in the low-voltage power distribution network safety protector microprocessor MCU, the threshold value of the calculated value is judged through the current and temperature data monitored by the sensor, and the control logic is set, so that the protection control function of the low-voltage power distribution network power transmission line can be realized, and the equipment linkage control function of on-line monitoring and on-site control can be realized.
Example 2
Referring to fig. 2-4, a second embodiment of the present application further provides a system for detecting and controlling safety protection of a low voltage distribution network, comprising,
the software system layer comprises a background of a low-voltage power distribution network safety protection detection control system, wherein the background comprises a front-end display module which is used for displaying monitoring data and alarm information; the data processing module is responsible for carrying out real-time processing, analysis and diagnosis on the data; the rule engine module is responsible for defining and managing security protection rules; the data storage module is responsible for storing various data in a lasting manner;
specifically, when the real-time monitoring data is abnormal or an alarm occurs, the low-voltage distribution network safety protection detection control system can automatically analyze and display abnormal users of electricity consumption through a safety protection control method, automatically control or manually perform opening and closing operation of the intelligent circuit breaker, display action information and prompt in time and display the switching position of the users.
The method is a computer control method for acquiring, inputting, editing, inquiring, analyzing, deciding and displaying space graphics and attribute data thereof through a computer graphic technology and a database technology, dynamically and visually displaying and processing geographic information and other system data, and can more conveniently and quickly display and analyze data information.
The low-voltage distribution network safety protection detection control system background based on the geographic information detection method and the control method has the main functions and the technical implementation method as follows:
1. the method comprises the steps of monitoring the areas based on a geographic information system, monitoring the running states of all areas on the basis of the area monitoring based on the geographic background, and providing real-time warning of abnormal running state information of station equipment for management staff.
The technical implementation method comprises the following steps: the system inputs the attribute parameters of various electrical data, geographic data and other related spatial data acquired by the sensor module of the terminal hardware layer into a database through a communication protocol of the sensor module, and the database adopts a relational database, so that a large amount of data can be stored and managed, and meanwhile, a rapid query and update function is provided. Through simulation software, a computer graphics technology and a Geographic Information System (GIS) technology are adopted to generate a simulation cloud picture, and normal stations and alarm stations are distinguished through means of colors, sound and the like; the GIS technology is used for processing the geographic information parameters and providing simulation results related to the actual geographic information.
2. The running state is monitored, a primary system diagram of the current station area can be accessed by clicking the station area mark, and the primary diagram displays the running state of the current station area, namely, a system topological diagram is displayed, parameters such as the temperature, the current, the voltage and the like of all the table areas and the station area access lines are displayed on the diagram, and the opening and closing state of the circuit breaker and the opening and closing state of the table box door are displayed in real time.
3. The historical data shows that the database stores temperature values at all measuring points at all moments and can be queried, and the data can be displayed through curves or lists.
4. And (3) alarm management, wherein when the system detects faults such as overheat, overvoltage, overcurrent, undervoltage and the like, the system alarms according to the defect level, and different alarm use marks can be set according to the working environments of different devices. The alarm is divided into data alarm and communication alarm.
5. The safety protection control can be carried out on a primary graph interface according to the condition of field monitoring data to remotely control the opening and closing of the intelligent circuit breaker, and the system can provide different prompt messages according to different authorities.
The technical implementation method comprises the following steps: the microprocessor MCU of the low-voltage distribution network safety protector is internally provided with a diagnosis control algorithm program, so that the protection control function of the low-voltage distribution network transmission line can be realized. The specific method is as the method for detecting and controlling the safety protection of the low-voltage distribution network.
6. And (3) data analysis, namely designing a corresponding electrical equipment fault diagnosis method according to the characteristics of the electrical equipment, carrying out diagnosis analysis statistics on related data, intuitively displaying analysis results, and achieving a real-time diagnosis effect, wherein specific data diagnosis analysis functions comprise fault diagnosis, path analysis and line loss analysis.
The fault diagnosis is carried out according to the data types detected by the electrical equipment installation sensor, such as current, temperature, partial discharge signal data and the like. The diagnosis method is provided, and the position and the reason of the fault are found by comprehensively analyzing and judging through artificial intelligence technology including neural network and fuzzy logic by combining historical data and equipment characteristic factors. The diagnosis result characterizes the health condition of the monitored equipment, and can provide a reference value for equipment maintenance for patrol maintenance staff.
And (3) path analysis, wherein the system performs path analysis on different distribution lines by using a geographic information system and a network analysis algorithm according to the connection mode and the position information on the distribution lines and the diagnostic value of the monitored electrical equipment, and calculates the connection relation and the path between the devices, so that the transmission paths of data such as current, voltage and the like in the power system are analyzed, and potential power system problems are identified. And the fault condition of the electrical equipment of each different distribution line is represented, the fault rate is compared, and the distribution line needing to be focused is highlighted.
And line loss analysis, line loss quartering calculation is mainly based on a power grid geographic information result provided by a system, and based on data provided by various metering systems, and the data is effectively integrated and analyzed by utilizing a data mining technology including a cluster analysis method and a regression analysis method. On the basis of stabilizing the power grid structure, various monitoring data are combined, the number of power grid equipment is counted, meanwhile, the accuracy of the standing accounts is guaranteed, the change condition of the power grid structure is mastered in real time, the connection relation in the geographic information system is guaranteed to be correct, the change of the power grid is required to be displayed in the geographic information system in time, and the problem is required to be thoroughly solved and processed according to the influence caused by single line loss quarter calculation of the change of the power grid structure.
7. Map management, wherein the map management functions in the system comprise graphic drawing, fault positioning, map measuring and hawk eye functions.
The system can draw pictures of geographic position distribution, draw wiring modes of distribution lines and correlate different power grid devices.
The technical implementation method comprises the following steps: through the connection between the devices, the power transmission and the power transformation devices are effectively fused, a scientific power grid model is established in the system, the geographic distribution diagram of the system directly shows the specific positions of the devices, and the circuit logic diagram shows the connection between the power grid devices.
The fault positioning can be carried out according to the needs of users in the system, and comprises a plurality of retrieval modes, and the related information of the power grid equipment is counted according to the user-specified mode. The statistics can be made on the full network voltage and various power devices.
The technical implementation method comprises the following steps: when a user fails, the system can accurately position the failure position, so that the exploration time of the failure position is reduced, the failure can be successfully solved in the shortest time, the time waste is avoided, the normal operation of the electric power is ensured, and the larger loss caused by long-time power failure is avoided.
The map measuring system is used for drawing the distribution line graph in equal proportion according to the real scale, the real size and the distance can be accurately measured from the system, the authenticity of the display of the specific position of the equipment is ensured, and convenience and accuracy are provided for the detection of the low-voltage distribution line.
10. The eagle eye function is used for accurately searching the detected target equipment by the system through an electronic map technology. In the electronic map, the position of the current window in the whole map is displayed, and when the current window changes the map, the eagle eye automatically changes correspondingly. The eagle eyes roam. The corresponding main window map display area can be changed by changing the window position in the eagle eye.
The communication technology layer comprises the steps of realizing the multi-channel transmission of terminal data by adopting a wireless communication module, carrying out multi-point acquisition, and carrying out the compatibility of a centralized summarized signal transmission channel and the existing centralized meter reading channel and the compatibility of a data interaction system.
Specifically, a wireless communication module, preferably 433MHz wireless communication module, is used for collecting wireless sensor information of a terminal hardware layer, and can provide multi-channel transmission and multi-point acquisition functions, and simultaneously can support centralized summary and total data transmission. And collecting information of the wireless temperature sensors of the terminal hardware layer, and transmitting the information to a low-voltage power distribution network safety protection detection control system background of the software system layer through a wireless communication module, preferably a 4G wireless communication module after centralized collection.
In the communication technology layer, the sensor and the low-voltage distribution network safety protector communicate through 433MHz wireless, a 4G communication module is installed in each set of low-voltage distribution network safety protector, and all data are uploaded to a low-voltage distribution network safety protection detection control system background through 4G.
And the terminal hardware layer comprises a sensor module and a low-voltage distribution network safety protector.
Specifically, the specific main working mode of the terminal hardware layer is as follows: transmitting temperature, electrified state and current information of the outgoing line of the surface area and the main switch into a low-voltage distribution network safety protector through a composite sensor; the intelligent breaker module accesses the low-voltage user information into the low-voltage distribution network safety protector through the RS-485 communication interface; the low-voltage distribution network safety protector integrates a 4G/WIFI module, low-voltage user information is transmitted to a platform region through a carrier wave, and data is sent to a low-voltage distribution network safety protection detection control system background through the low-voltage distribution network safety protector of the platform region, so that unified data display, statistics and analysis are carried out.
The sensor module is an electricity consumption state sensing sensor and comprises two parts, namely energy collection, measurement and data transmission, data information monitored by the sensor can be wirelessly uploaded to the low-voltage distribution network safety protector, multi-path electric quantity data, multi-point temperature monitoring information and multi-path user side electricity consumption state monitoring information are collected, the low-voltage distribution network safety protector realizes data uploading and remote control instruction output functions, and manual or automatic load control can be carried out according to a preset load control strategy when heavy overload occurs.
The low-voltage power distribution network safety protector collects sensor data and then transmits the sensor data to a low-voltage power distribution network safety protection detection control system background. The background of the low-voltage distribution network safety protection detection control system can interact data information with the metering automation system, and the metering automation system transmits data to the marketing system and the low-voltage control system respectively; and the marketing and distribution system and the low-voltage control system realize data interaction. The distribution system can be used for distributing user electricity consumption when the transformer is overloaded, and providing power grid construction and planning data support for the management department; when the distribution transformer is overloaded, the distribution transformer is directly and manually controlled by low-voltage user load distribution in the distribution system, so that the distribution transformer is ensured to operate in a reasonable range.
Specifically, the low-voltage distribution network safety protector includes, information acquisition module: the system is used for collecting information detected by the sensor, and the collected data comprises electrical parameters, temperature, circuits, distribution transformer overload, user power failure information, fault abnormality warning and abnormal collection and monitoring information of the remote sensor. DSP: the method is used for processing the acquired data signals and performing operations such as filtering, demodulation, calculation and the like. MCU: for controlling and managing the operation of the overall security protector, including the collection, processing and communication of data. And a data storage module: the method is used for storing the acquired data information and is convenient for subsequent data analysis and processing. GPRS communication module: the GPRS network is used for communicating with a remote monitoring center to realize data transmission and control instruction issuing. 4G communication module: the system is used for communicating with a remote monitoring center through a 4G network, so that faster and more stable data transmission and control instruction issuing are realized. Status indicator lamp: for displaying the operating status of the safety protector, such as power supply, communication, malfunction, etc. 433 wireless communication module: the wireless sensor is used for communicating with the wireless sensor to collect monitoring information. RS485 communication module: for data communication with other devices, such as intelligent circuit breaker modules. Switching value output end: for outputting control instructions, such as controlling intelligent circuit breaker switches, effecting load distribution adjustments, etc. Switching value input end: for receiving control instructions, such as remote control commands, of other devices. Door status signal lamp: for displaying the door status of the safety protector, such as open, closed, etc. Intelligent circuit breaker module: the intelligent circuit breaker is used for realizing control of the intelligent circuit breaker and can realize protection, operation and measurement functions; the protection function: the protection function of overload, short circuit, residual current, open phase, overvoltage, undervoltage and zero-break is realized, and meanwhile, the reclosing can be automatically realized; operation function: the manual and electric opening and closing operation can be performed; measuring function: the operating voltage, current, line residual current can be detected.
Table 1 comparing the system with the conventional system
As can be seen from the table, the circuit design of the application adopts a dual-core driving mode of DSP+MCU, which can better exert the safety protection detection control function, and the traditional method only has the calculation function and does not contain the safety protection control logic; through at the intelligent circuit breaker module of safety protector design, built-in diagnosis algorithm judgement logic in the MCU, can calculate and according to the judgement result, input corresponding control signal to intelligent circuit breaker module, directly exert the effect of safety protection control, have more quick reaction rate, play low voltage distribution network safety protection control effect and early warning effect that can be better, the safety of protection power consumption terminal.
The functions of the low-voltage distribution network safety protector comprise the following steps:
(1) The temperature measurement data acquisition function is used for monitoring the temperatures of the incoming and outgoing lines and the neutral line of the main switch in the surface area and the platform area, and 7-point temperature measurement is set; and (3) monitoring the temperature of the live wire at the outgoing line side of the household meter, wherein the specific point number is the same as the number of the electric meters. And installing a thermistor sensor at the monitoring position of the low-voltage equipment to measure the temperature.
(2) The protection function realizes automatic tripping of overtemperature, overcurrent and overvoltage on the surface area, overtemperature alarm needs to study various modes including absolute temperature alarm, temperature rise change rate alarm, relative comparison temperature difference alarm, reservation setting, diagnosis control algorithm, load temperature rise correlation analysis function and the like, and specific alarm values can be set according to user requirements.
(3) And the electric quantity acquisition function is realized, the total incoming line current, voltage and harmonic wave acquisition function of the meter area is realized, and meanwhile, the current of the outgoing line side of the meter area and the charged state information are acquired, and the specific content is shown in a table 1.
Table 1 electric quantity collection types
(4) And the low-voltage distribution network safety protector has the functions of RS485, WIFI, 4G and carrier communication. The data of the table area and the switch state are remotely transmitted to the table area through a broadband carrier or a 4G signal, and then are transmitted to the control center through the 4G signal, and meanwhile, the control center can issue a control command through the 4G signal to remotely control the switch to be opened and closed.
(5) And the standby power supply function, the whole device of the safety protector of the low-voltage distribution network is required to provide a standby operation power supply, and when the power of a station area is cut off, the standby requirements of the operation of the circuit breaker on and off for 1 time and 24 hours can be at least ensured.
(6) The wave recording function is realized, the low-voltage distribution network safety protector has the wave recording function, current and voltage waveforms can be recorded, and the waveforms are stored in the system, so that the subsequent calling is convenient. The sampling interval of the system is 0.1ms, namely 200 sampling points are arranged in one power frequency period. The system detection bandwidth is 1MHz, and various harmonic signals can be effectively detected.
(7) The on-site storage function is realized, and the low-voltage distribution network safety protector has the on-site storage function and can store waveform data. The normal current and voltage waveforms are stored for 48 hours, and fault current and voltage waveforms are always stored in the system, so that subsequent fault analysis is facilitated.
(8) And the geographic position information is used for collecting the position information of the monitoring points of the sensor and the circuit breaker and sending the position information to a low-voltage distribution user safety early warning system based on a geographic information system. The method is convenient for finding the position of the fault point in the system and carrying out timely fault treatment.
(9) Control function, remote signaling amount: the breaker is in a switching-off and switching-on state. The live state of the outgoing line of the household meter and the switch state of the cabinet door; remote control amount: remote control intelligent breaker module opens and closes; logic control: the high and low overrun tripping of temperature, current and voltage can be set, 1 or 2 of them can be all overrun tripped, the tripping can be started and stopped (i.e. only the alarm function is reserved and not tripped); remote in situ: the remote and local selection can be set at the front end and the background, and the front end has high priority.
(10) And the transformer partial discharge function is used for monitoring the partial discharge of the transformer in the transformer area in real time aiming at the transformer in the transformer area, and can upload data to a background system.
(11) The intelligent lock function, the intelligent lock is applied to the device installation case, and according to background authority setting, the APP is realized sweeping the two-dimensional code to open the door to the user who has authority to realize switch door information uploading function.
The application can realize real-time monitoring and control of on-site operation equipment through the structural function design of three layers of the software system layer, the communication management layer and the terminal hardware layer, so as to realize various functions of data acquisition, map management, fault diagnosis, equipment control, measurement, parameter adjustment, various signal alarms and the like. The detection method and the control method based on the geographic information can combine the geographic position information with the electrical related parameters according to the functional characteristics of the geographic information system, and are applied to low-voltage distribution user management, so that the management of a city-county-level power company in a low-voltage distribution network is facilitated. The advantage of the visual analysis management of the geographic information system is beneficial to the comprehensive management of the low-voltage distribution network in a complex environment, and the informatization level of the low-voltage distribution network is improved. According to the remote communication and control method based on 4G communication, each meter area monitoring point can independently collect data and upload and gather the data in real time through 4G, so that the centralized management and control of the data are facilitated.
Example 3
One embodiment of the present application, which is different from the first two embodiments, is:
the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (10)
1. A low-voltage distribution network safety protection detection control method is characterized by comprising the following steps of: comprising the steps of (a) a step of,
the sensor collects equipment data and rationalizes and filters the data;
when the sensor data accords with the filtering condition, starting a rated load highest temperature prediction algorithm to obtain a prediction result;
and setting a logic judgment process, judging according to the prediction result, and controlling the opening and closing of the intelligent circuit breaker.
2. The method for controlling the safety protection detection of the low-voltage distribution network according to claim 1, wherein the method comprises the following steps: the data comprises current data and temperature data; the filtering conditions include a reasonable range of temperature data: -20 ℃ to 199 ℃, and judging that the sensor data is abnormal when the sensor data exceeds the range; reasonable range of current data: and 0A-5000A, and judging that the sensor data is abnormal when the sensor data exceeds the range.
3. The low-voltage distribution network safety protection detection control method as claimed in claim 2, wherein: the rated load maximum temperature prediction algorithm formula is as follows:
T M ＝(T t -T0 t )/I t 2 ×I e 2 +T0 t
wherein T is M T is the maximum temperature predicted value under rated load t For the temperature value of the cable at time T, T0 t For the temperature value of the sensor at the moment t, I t For the value of the current flowing through the cable at time t, I e Is the rated load of the intelligent circuit breaker.
4. A low-voltage distribution network safety protection detection control method as claimed in claim 3, wherein: the logic determination process includes the steps of,
when the temperature is less than 85 DEG C M When the temperature is less than 105 ℃, the system sends out an early warning signal, and the early warning signal and an intelligent breaker opening and closing state signal are wirelessly uploaded to system software through a low-voltage distribution network safety protector;
when T is M When the temperature is more than 105 ℃, the system sends out an alarm signal, and the microprocessor MCU of the safety protector of the low-voltage distribution network sends out a switching value control signal through logic control to output and control the intelligent breaker module to perform switching-off operation; the alarm signal and the switch-on/off state signal of the intelligent breaker are wirelessly uploaded to system software through a low-voltage distribution network safety protector;
after the intelligent breaker is opened, when T M When the temperature is less than 80 ℃ and exceeds 10 minutes, the MCU sends out a switching value control signal through logic control to output and control the intelligent breaker module to perform switching-on operation; and the switching-on and switching-off state signal of the intelligent circuit breaker is wirelessly uploaded to system software through the low-voltage distribution network safety protector.
5. The utility model provides a low voltage distribution network safety protection detects control system which characterized in that: the method comprises the steps of 1-4, namely, a low-voltage distribution network safety protection detection control method; the method comprises the steps of,
the software system layer comprises a low-voltage distribution network safety protection detection control system background, wherein the background comprises a front-end display module, a data processing module, a rule engine module and a data storage module, wherein the front-end display module is used for displaying monitoring data and alarm information, the data processing module is used for carrying out real-time processing, analysis and diagnosis on the data, the rule engine module is used for defining and managing safety protection rules, and the data storage module is used for storing various data in a lasting mode;
the communication technology layer comprises the steps of realizing multi-channel transmission of terminal data by adopting a wireless communication module, carrying out multi-point acquisition, and enabling a signal transmission channel after centralized summarization to be compatible with the existing centralized meter reading channel and enabling a data interaction system to be compatible;
the terminal hardware layer comprises a sensor module and a low-voltage distribution network safety protector;
the sensor module is an electricity consumption state sensing sensor, data information monitored by the sensor is uploaded to a low-voltage distribution network safety protector in a wireless mode, and multi-path electric quantity data, multi-point temperature monitoring information and multi-path user side electricity consumption state monitoring information are collected;
the low-voltage distribution network safety protector comprises an information acquisition module, a DSP, an MCU, a data storage module, a GPRS communication module, a 4G communication module, a status indicator lamp, a 433 wireless communication module, an RS485 communication module, a switching value output end, a switching value input end, a door status signal lamp and an intelligent circuit breaker module.
6. The low voltage power distribution network safety protection detection control system according to claim 5, wherein: the working flow of the low-voltage distribution network safety protection detection control system is as follows,
the low-voltage distribution network safety protection detection control system monitors incoming line load and temperature of a surface area through a sensor module in a terminal hardware layer and collects various operation data;
the monitoring operation data is uploaded to the low-voltage power distribution network safety protector through a communication technology layer, namely, the sensor monitoring data is transmitted to a low-voltage power distribution network safety protection detection control system background of a software system layer through a 4G wireless communication module after being collected by the low-voltage power distribution network safety protector;
and the data is transmitted to a background of a safety protection detection control system of the low-voltage distribution network, real-time monitoring and comprehensive analysis and evaluation of the surface area data are carried out, and the opening and closing of the intelligent circuit breaker are remotely controlled through a safety protection control function in the background.
7. The low voltage power distribution network safety protection detection control system according to claim 6, wherein: the background of the low-voltage distribution network safety protection detection control system comprises the steps of adopting a C/S structure, namely a system framework of a client/server structure, in system software, storing various information data through a space database SQLServer, and browsing, editing, inquiring, outputting, modeling and analyzing the space data; the geographic information and other system data are dynamically and visually displayed and analyzed; the combination of the geographical location information and the electrical related parameters is applied to low voltage distribution user management.
8. The low voltage power distribution network safety protection detection control system according to claim 7, wherein: the information acquisition module is used for acquiring data detected by the sensor, including electrical parameters, temperature, circuits, distribution transformer weight overload, user power failure information, fault abnormality warning, and abnormality acquisition information and monitoring information of the remote sensor;
the MCU is used for controlling and managing the operation of the safety protector;
the intelligent breaker module has overload, short circuit, residual current, open phase, overvoltage, undervoltage and zero-break protection functions and can automatically reclose; performing manual and electric opening and closing operations; the operating voltage, current and line residual current are detected.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that: the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 4.
10. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed by a processor, implements the steps of the method of any of claims 1 to 4.
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| CN117318313B (en) * | 2023-11-29 | 2024-02-13 | 山西晋创区块链科技有限公司 | Power stealing and power mixing identification positioning method and system based on image data of electric equipment |
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