CN112821386A - Urban distribution network line loss measuring and calculating system - Google Patents

Urban distribution network line loss measuring and calculating system Download PDF

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Publication number
CN112821386A
CN112821386A CN202110018044.7A CN202110018044A CN112821386A CN 112821386 A CN112821386 A CN 112821386A CN 202110018044 A CN202110018044 A CN 202110018044A CN 112821386 A CN112821386 A CN 112821386A
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server
power supply
line loss
distribution network
electric energy
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Inventor
周斌
胡壮
黎灿兵
李雅凯
李文芳
黄文焘
张聪
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Huaxiang Xiangneng Technology Co Ltd
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Huaxiang Xiangneng Technology Co Ltd
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/15—Correlation function computation including computation of convolution operations
    • 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]
    • 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
    • H02J13/00002—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
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL 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
    • 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

Abstract

The invention discloses a system for measuring and calculating line loss of a city power distribution network, which comprises an intelligent electric meter, a monitoring device, a server and a display, wherein the intelligent electric meter, the monitoring device, the server and the display are arranged in the city power distribution network; the urban power distribution network comprises a distribution transformer and a power supply line connected to the secondary output side of the distribution transformer; the number of the power supply lines is multiple; the electric equipment is connected to the tail end of the power supply line; the intelligent electric meter is arranged at the joint of each electric device and the power supply circuit; the monitoring device is arranged on the secondary side of the distribution transformer; the intelligent electric meter and the monitoring device are in communication connection with the server; the display is in communication connection with the server; the urban distribution network line loss measuring and calculating system provided by the invention can measure and calculate the line loss electric quantity of the urban distribution network more simply, rapidly and efficiently.

Description

Urban distribution network line loss measuring and calculating system
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a system for measuring and calculating line loss of an urban power distribution network.
Background
The line loss is the loss of electric energy in each link of power grid transmission, transformation, power distribution and the like, is an objective physical phenomenon in the transmission and distribution process of the electric energy in the power grid, and is the maximum loss factor of the electric energy in the transmission process at present. Under the current global environmental pressure and the trend of energy shortage, the construction of a low-carbon and high-efficiency smart grid becomes the development direction of the 21 st century power grid.
Therefore, the line loss of the power system is continuously reduced, the economic benefit of the operation of the power system is improved, the problem of the power system is very significant, and the line loss of the power distribution network accounts for a considerable proportion of the line loss of the whole power grid in the process of transmission and distribution of electric energy. According to statistics of relevant data, assuming that the line loss of the whole power distribution network is 100%, the line loss of the 110kV power distribution network is 26%, the line loss of the 35kV power distribution network is 10%, and the line loss of the 10kV power distribution network is 64%, that is, the lower the transmission voltage is, the more the line loss of the transmission network is, so how to reduce the line loss of the power distribution network is the key for improving the economic benefit of the power system.
When the line loss of the power distribution network is required to be reduced, the actual line loss of the power distribution network is necessarily measured and calculated, and targeted improvement is performed according to the measurement and calculation result so as to reduce the line loss of the power distribution network; however, the line loss of the existing power distribution network is mainly calculated by manually calculating the line loss after ammeter data is manually collected, the whole calculation process is complicated and time-consuming, and especially, the network connection of the urban power distribution network is complicated, so that the accuracy of the line loss measurement value of the power distribution network is insufficient, and the workload is large.
Disclosure of Invention
The invention mainly aims to provide a system for measuring and calculating line loss of an urban power distribution network, and aims to solve the problems that the accuracy of a line loss measured value of the existing urban power distribution network is insufficient, and the workload is large.
The technical scheme provided by the invention is as follows:
a line loss measuring and calculating system for an urban power distribution network comprises an intelligent electric meter, a monitoring device, a server and a display, wherein the intelligent electric meter, the monitoring device, the server and the display are arranged in the urban power distribution network; the urban power distribution network comprises a distribution transformer and a power supply line connected to the secondary output side of the distribution transformer; the number of the power supply lines is multiple; the electric equipment is connected to the tail end of the power supply line;
the intelligent electric meter is arranged at the joint of each electric device and the power supply circuit; the monitoring device is arranged on the secondary side of the distribution transformer; the intelligent electric meter and the monitoring device are in communication connection with the server; the display is in communication connection with the server;
the intelligent electric meter is used for acquiring operation data of each electric device and sending the operation data to the server, wherein the operation data comprise load voltage and power factors of the electric devices;
the monitoring device is used for acquiring outgoing line data of the distribution transformer for each power supply line and sending the outgoing line data to the server, wherein the outgoing line data comprise outgoing line voltage and daily power supply amount;
the server is used for obtaining manually input power distribution parameters, calculating to obtain electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and sending the electric energy line loss to the display for displaying.
Preferably, the power distribution parameters include: kpLoss factor F, load factor F; the server comprises a computing unit configured to: calculating to obtain the electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and the method comprises the following steps:
calculating to obtain the voltage loss rate delta Umax-i％：
Figure BDA0002887700840000021
Wherein, UmaxIs the outgoing line voltage U at the maximum load of the urban distribution networkmax-iA voltage of the electric device at a terminal of each of the power supply lines;
calculating to obtain the power loss rate delta P of each power supply circuitmax-i％：
ΔPmax-i％＝Kp*ΔUmax-i％，
Wherein, KpInquiring a cable section current-carrying capacity power factor current comparison table according to the conductor number of the urban distribution network and the power factor to obtain the current-carrying capacity power factor current comparison table;
calculating to obtain the electric energy loss rate delta A of the ith power supply circuiti％：
Figure BDA0002887700840000022
Wherein, F represents loss factor, and F represents load factor;
calculating to obtain the power loss delta A of the ith power supply linei：
ΔAi＝Ai*ΔAi％，
Wherein A isiRepresents the daily power supply amount of an ith power supply line;
calculating to obtain the electric energy line loss delta A of the urban distribution network:
Figure BDA0002887700840000031
wherein n is the total number of the power supply lines, and the electric energy line loss amount is the daily electric energy line loss amount.
Preferably, the server includes a first communication unit; the intelligent electric meter comprises a second communication unit; the second communication unit is used for communicating with the first communication unit so as to send the operation data from the intelligent electric meter to the server.
Preferably, the server further comprises a storage unit; the storage unit is used for storing the operation data, the outgoing line data, the power distribution parameters and the electric energy line loss.
Preferably, the server further includes a third communication unit; and the third communication unit is used for communicating with the display to send the electric energy line loss amount from the server to the display for displaying.
Preferably, the third communication unit is further configured to communicate with an external intelligent terminal, so as to send the electric energy line loss amount from the server to the external intelligent terminal.
Preferably, the monitoring device comprises a fourth communication unit; the fourth communication unit is used for communicating with the first communication unit, and the outgoing line data is sent to the server from the monitoring device.
Preferably, the monitoring device further comprises an alternate acquisition chip for acquiring the outgoing line data.
Preferably, the system further comprises an input component in communication connection with the server; the input component is used for inputting the power distribution parameters.
Preferably, the server further comprises a comparison unit; the comparison unit is used for: analyzing the daily electric energy line loss amount, and judging whether the electric energy line loss amount rises continuously for a first preset time period; if yes, alarm information is generated and sent to the display through the third communication unit to be displayed.
Through above-mentioned technical scheme, can realize following beneficial effect:
the urban distribution network line loss measuring and calculating system provided by the invention can measure and calculate the line loss electric quantity of the urban distribution network more simply, rapidly and efficiently; specifically, an intelligent electric meter is arranged between electric equipment and a power supply line, a monitoring device is arranged on the secondary side of a power distribution network transformer, operation data collected by the intelligent electric meter and outgoing line data collected by the monitoring device are automatically sent to a server, and the server calculates the electric energy line loss of the whole power distribution network by combining power distribution parameters; manual calculation is not needed after electric meter data are collected manually, so that the whole measuring and calculating process is time-saving and labor-saving, and the workload is greatly reduced.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic partial structure diagram of an embodiment of a system for measuring and calculating line loss of an urban distribution network according to the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a system for measuring and calculating line loss of an urban power distribution network.
As shown in fig. 1, in an embodiment of the system for measuring and calculating line loss of a city power distribution network provided by the present invention, the system for measuring and calculating line loss of a city power distribution network includes an intelligent electric meter, a monitoring device, a server and a display, which are disposed in the city power distribution network; the urban power distribution network comprises a distribution transformer and a power supply line connected to the secondary output side of the distribution transformer; the number of the power supply lines is multiple; and the electric equipment is connected to the tail end of the power supply line.
The intelligent electric meter is arranged at the joint of each electric device and the power supply circuit; the monitoring device is arranged on the secondary side of the distribution transformer; the intelligent electric meter and the monitoring device are in communication connection with the server; the display is in communication connection with the server.
The intelligent electric meter is used for collecting operation data of each electric device and sending the operation data to the server, wherein the operation data comprise load voltage and power factors of the electric devices.
The monitoring device is used for collecting outgoing line data of the distribution transformer for each power supply line and sending the outgoing line data to the server, wherein the outgoing line data comprise outgoing line voltage and daily power supply quantity.
The server is used for obtaining manually input power distribution parameters, calculating to obtain electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and sending the electric energy line loss to the display for displaying.
The urban distribution network line loss measuring and calculating system provided by the invention can measure and calculate the line loss electric quantity of the urban distribution network more simply, rapidly and efficiently; specifically, an intelligent electric meter is arranged between electric equipment and a power supply line, a monitoring device is arranged on the secondary side of a power distribution network transformer, operation data collected by the intelligent electric meter and outgoing line data collected by the monitoring device are automatically sent to a server, and the server calculates the electric energy line loss of the whole power distribution network by combining power distribution parameters; manual calculation is not needed after electric meter data are collected manually, so that the whole measuring and calculating process is time-saving and labor-saving, and the workload is greatly reduced.
In addition, in another embodiment of the system for measuring and calculating line loss of the urban distribution network, the distribution parameters include: kpLoss factor F, load factor F; the server comprises a computing unit configured to: calculating to obtain the electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and the specific steps comprise:
calculating to obtain the voltage loss rate delta Umax-i％：
Figure BDA0002887700840000051
Wherein, UmaxIs the outgoing line voltage U at the maximum load of the urban distribution networkmax-iA voltage of the electric device at a terminal of each of the power supply lines;
calculating to obtain the power loss rate delta P of each power supply circuitmax-i％：
ΔPmax-i％＝Kp*ΔUmax-i％，
Wherein, KpInquiring a cable section current-carrying capacity power factor current comparison table according to the conductor number and the power factor of the urban distribution network to obtain the current-carrying capacity power factor current comparison table;
calculating to obtain the electric energy loss rate delta A of the ith power supply circuiti％：
Figure BDA0002887700840000052
Wherein, F represents loss factor, and F represents load factor;
calculating to obtain the power loss delta A of the ith power supply linei：
ΔAi＝Ai*ΔAi％，
Wherein A isiRepresents the daily power supply amount of an ith power supply line;
calculating to obtain the electric energy line loss delta A of the urban distribution network:
Figure BDA0002887700840000053
wherein n is the total number of the power supply lines, and the electric energy line loss amount is the daily electric energy line loss amount.
Through the technical scheme of this embodiment, the electric energy line loss volume of calculating the distribution network that can be concrete, and the electric energy line loss volume here is day electric energy line loss volume to subsequent contrast is convenient for.
Meanwhile, in an embodiment of the system for measuring and calculating the line loss of the urban distribution network, the server further includes a comparison unit; the comparison unit is used for: analyzing the daily electric energy line loss amount, and judging whether the electric energy line loss amount rises continuously for a first preset time period (preferably continuously for 3 days in the embodiment); if yes, alarm information is generated and sent to the display through the third communication unit to be displayed.
This embodiment is used for handling when the condition that rises in succession appears in the electric energy line loss volume, in time generates alarm information to send alarm information to the display and show, in order to remind managers in time to pinpoint the reason.
Meanwhile, in an embodiment of the system for measuring and calculating the line loss of the urban distribution network, the server includes a first communication unit; the intelligent electric meter comprises a second communication unit; the second communication unit is used for communicating with the first communication unit so as to send the operation data from the intelligent electric meter to the server.
The server further comprises a storage unit; the storage unit is used for storing the operation data, the outgoing line data, the power distribution parameters and the electric energy line loss.
The server further comprises a third communication unit; and the third communication unit is used for communicating with the display to send the electric energy line loss amount from the server to the display for displaying.
And the third communication unit is also used for communicating with an external intelligent terminal so as to transmit the electric energy line loss amount to the external intelligent terminal from the server. The monitoring device comprises a fourth communication unit; the fourth communication unit is used for communicating with the first communication unit, and the outgoing line data is sent to the server from the monitoring device.
The monitoring device also comprises an alternate acquisition chip for acquiring the outgoing line data. The urban distribution network line loss measuring and calculating system further comprises an input assembly in communication connection with the server; the input component is used for inputting the power distribution parameters.
Through the technical scheme, the structure of the urban distribution network line loss measuring and calculating system is perfected, and the functions of the urban distribution network line loss measuring and calculating system are perfected.
In addition, in an embodiment of the system for measuring and calculating line loss of the urban distribution network, the storage unit is configured to store manually input distribution network events, where the distribution network events include event summaries and event times; the comparison unit is further configured to:
acquiring historical data of electric energy line loss; the historical data of the electric energy line loss amount is the electric energy line loss amount of each day in the last third preset time period (such as the last 2 years).
Comparing the current power line loss with the previous same-day power line loss (i.e. judging the same-day variation of the current power line loss), and judging whether the current power line loss has a larger increase, wherein the larger increase is defined as a 20% increase in the same ratio.
If so, acquiring the electric energy line loss in the previous second preset time period (such as 3 days), and judging whether the electric energy line loss rises by 20% in the same ratio when the continuous second preset time period (3 days) occurs.
If so, acquiring the loss amount of the electric energy line day by day, judging whether the loss amount of the electric energy line rises by 20% in the same ratio until the loss amount of the electric energy line does not rise by 20% in the same ratio, and marking the day on which the loss amount of the electric energy line does not rise by 20% in the same ratio as the source date.
The server is further configured to obtain the current day of the source date and corresponding power distribution network events in each 2 days (5 days in total) before and after the source date, mark the power distribution network events as suspected events, and send the suspected events to the display for display.
Specifically, this embodiment is mainly used for finding out the reason that leads to the distribution network electric energy line loss to rise, and the distribution network event here has included various change actions to the distribution network hardware is taken, if: the trend of the power supply circuit is changed, the power supply circuit is increased, the power supply circuit is decreased, the looped network power supply points are accessed, the electric equipment is increased, the electric equipment is decreased, and the like.
Under normal conditions, namely under the condition that the distribution network is not changed in terms of lines, the electric energy line loss of the distribution network is not changed much on the same scale, and if the electric energy line loss is increased too much on the same scale (namely increased by 20%) in a second preset time period (3 days) continuously, whether the electric energy line loss is caused by the fact that the distribution network is changed greatly in hardware or the input mode of a power supply is changed (namely, corresponding various distribution network events) needs to be considered; directly trace back to the source date that the electric energy line loss volume appears great growth forward, show the distribution network incident around that day in addition in the display to make things convenient for managers in time to find the reason that the electric energy line loss volume appears rising, in order to make corresponding improvement measure.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, wherein the software product is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A line loss measuring and calculating system of an urban power distribution network is characterized by comprising an intelligent electric meter, a monitoring device, a server and a display, wherein the intelligent electric meter, the monitoring device, the server and the display are arranged in the urban power distribution network; the urban power distribution network comprises a distribution transformer and a power supply line connected to the secondary output side of the distribution transformer; the number of the power supply lines is multiple; the electric equipment is connected to the tail end of the power supply line;
the intelligent electric meter is arranged at the joint of each electric device and the power supply circuit; the monitoring device is arranged on the secondary side of the distribution transformer; the intelligent electric meter and the monitoring device are in communication connection with the server; the display is in communication connection with the server;
the intelligent electric meter is used for acquiring operation data of each electric device and sending the operation data to the server, wherein the operation data comprise load voltage and power factors of the electric devices;
the monitoring device is used for acquiring outgoing line data of the distribution transformer for each power supply line and sending the outgoing line data to the server, wherein the outgoing line data comprise outgoing line voltage and daily power supply amount;
the server is used for obtaining manually input power distribution parameters, calculating to obtain electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and sending the electric energy line loss to the display for displaying.
2. The system according to claim 1, wherein the power distribution parameters comprise: kpLoss factor F, load factor F; the server comprises a computing unit configured to: calculating to obtain the electric energy line loss according to the received power distribution parameters, the received operation data and the received outgoing line data, and the method comprises the following steps:
calculating to obtain the voltage loss rate delta Umax-i％：
Figure FDA0002887700830000011
Wherein, UmaxIs the outgoing line voltage U at the maximum load of the urban distribution networkmax-iA voltage of the electric device at a terminal of each of the power supply lines;
calculating to obtain the power loss rate delta P of each power supply circuitmax-i％：
ΔPmax-i％＝Kp*ΔUmax-i％，
Wherein, KpInquiring a cable section current-carrying capacity power factor current comparison table according to the conductor number of the urban distribution network and the power factor to obtain the current-carrying capacity power factor current comparison table;
calculating to obtain the electric energy loss rate delta A of the ith power supply circuiti％：
Figure FDA0002887700830000021
Wherein, F represents loss factor, and F represents load factor;
calculating to obtain the power loss delta A of the ith power supply linei：
ΔAi＝Ai*ΔAi％，
Wherein A isiRepresents the daily power supply amount of an ith power supply line;
calculating to obtain the electric energy line loss delta A of the urban distribution network:
Figure FDA0002887700830000022
wherein n is the total number of the power supply lines, and the electric energy line loss amount is the daily electric energy line loss amount.
3. The system according to claim 1, wherein the server comprises a first communication unit; the intelligent electric meter comprises a second communication unit; the second communication unit is used for communicating with the first communication unit so as to send the operation data from the intelligent electric meter to the server.
4. The system for measuring and calculating line loss of the urban distribution network according to claim 3, wherein the server further comprises a storage unit; the storage unit is used for storing the operation data, the outgoing line data, the power distribution parameters and the electric energy line loss.
5. The system according to claim 1, wherein the server further comprises a third communication unit; and the third communication unit is used for communicating with the display to send the electric energy line loss amount from the server to the display for displaying.
6. The system according to claim 5, wherein the third communication unit is further configured to communicate with an external smart terminal to send the line loss amount of the electric energy from the server to the external smart terminal.
7. The system according to claim 3, wherein the monitoring device comprises a fourth communication unit; the fourth communication unit is used for communicating with the first communication unit, and the outgoing line data is sent to the server from the monitoring device.
8. The system according to claim 7, wherein the monitoring device further comprises an alternate acquisition chip for acquiring the outgoing line data.
9. The system according to claim 4, further comprising an input module communicatively connected to the server; the input component is used for inputting the power distribution parameters.
10. The system for measuring and calculating line loss of the urban distribution network according to claim 5, wherein the server further comprises a comparison unit; the comparison unit is used for: analyzing the daily electric energy line loss amount, and judging whether the electric energy line loss amount rises continuously for a first preset time period; if yes, alarm information is generated and sent to the display through the third communication unit to be displayed.
CN202110018044.7A 2021-01-07 2021-01-07 Urban distribution network line loss measuring and calculating system Pending CN112821386A (en)

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Citations (4)

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