CN112737106A - Line loss abnormity subsection control method - Google Patents
Line loss abnormity subsection control method Download PDFInfo
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- CN112737106A CN112737106A CN202011454632.7A CN202011454632A CN112737106A CN 112737106 A CN112737106 A CN 112737106A CN 202011454632 A CN202011454632 A CN 202011454632A CN 112737106 A CN112737106 A CN 112737106A
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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
- H02J13/00002—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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- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/088—Aspects of digital computing
-
- 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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—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 an electric power substation
Abstract
The invention provides a line loss abnormity subsection control method, which is based on a power distribution automation system, takes a switch station as a minimum unit, collects power distribution data of each switch station, sets a line loss rate limit value, calculates the power supply quantity, the power selling quantity, the loss electric quantity and the line loss rate of each switch station, monitors the line loss rate of a calculated line in real time, and screens the switch stations while giving an alarm if an abnormal condition occurs, so that the line loss range is reduced to a specific switch station, the reaction time of a maintainer on the abnormal condition of the line loss is reduced, the time and the energy of the maintainer for checking the abnormal reason of the line loss are reduced, and the reliability of a power supply system is further improved.
Description
Technical Field
The invention relates to the field of line loss control, in particular to a line loss abnormal sectional control method.
Background
When electric energy passes through power supply equipment such as a line and a transformer, the generated electric energy loss and power loss are line loss, and the line loss is inevitable loss, but in the actual operation process of a power system, the line loss rate of the line has a scientific theoretical value. However, in the actual operation process of the power system, due to reasons such as a line loss relation error, electricity stealing by a high-voltage user, a meter error of a gateway meter of a transformer substation, a meter fault of a user meter, a fault of a public transformer terminal and the like, the line loss rate of a line is abnormal, but the current means for checking the reason of the abnormal line loss rate is single, most of the current means depends on the experience of maintenance personnel, whether the line loss rate abnormal line is cut by a user or not recently or has a meter change or not is checked, whether all data at the bottom of the line loss rate abnormal line are received or not is checked, even the line loss relation is checked in the whole line, whether the electricity stealing by the user or not is checked, the workload is large, and the time and.
The chinese patent publication 111781463a, published in 10/16/2020, provides an auxiliary diagnosis method for line loss abnormality of a distribution room, which is used for performing auxiliary analysis on an abnormal line loss distribution room based on a theoretical value of the line loss of the distribution room, and automatically diagnosing the abnormal line loss distribution room according to three types, i.e., high loss and negative loss, which cannot be counted. However, the chinese patent is directed to the reason for the line loss abnormality of a certain distribution area, and the abnormality cannot be specified to individual lines in the distribution area. Therefore, how to monitor the line loss rate of the line in real time and quickly locate the line loss abnormal line is convenient for the maintainers to carry out daily monitoring and investigate abnormal reasons, and the problem to be solved is solved urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a line loss abnormal segmented control method, which realizes real-time monitoring of line loss rate of a line and quick positioning of a line loss abnormal line.
The purpose of the invention is realized by the following technical scheme:
a line loss abnormal subsection control method comprises the following steps:
the method comprises the following steps: based on a power distribution automation system, the power distribution automation system comprises a plurality of switching stations, and power distribution data of each switching station is collected by taking the switching station as a minimum unit;
step two: collecting daily frozen electric quantity data of low-voltage users under each switch station, setting a line loss rate limit value, calculating the power supply quantity, the electricity selling quantity, the loss electric quantity and the line loss rate of each switch station according to a line loss algorithm, and executing a third step if the calculated line loss rate exceeds the limit value;
step three: setting a time period and selecting a switching station, and executing a judgment substep, wherein the judgment substep specifically comprises the following steps: according to the power supply amount calculated in the second step, in combination with a topological relation between a line and a user, comparing the power supply amount of the switching station with the daily frozen power amount of a low-voltage user under the switching station in a set time period, judging whether the bus load rate of the switching station is balanced, and if the result of the substep is that the bus load rate of the switching station is unbalanced, reducing the range of abnormal line loss into the switching station; if so, selecting the remaining one of the switchyard of the power distribution automation system and continuing to execute the sub-determining step.
The switching station is used as a minimum unit for data processing, and the power supply line is divided into smaller parts, so that the abnormity can be more accurately positioned. Since the scientific theoretical values of the line loss of different lines are different, when the line loss rate is monitored in real time, the scientific theoretical value of the line loss rate of each line is calculated, and the obtained line loss abnormal condition is more real and credible. If the line loss rate of the line is abnormal, the switching stations on the line are checked one by one, the range of the line loss abnormality is narrowed to a certain switching station, and the workload of maintainers in checking the line loss abnormality is reduced.
Further, the data of the daily frozen electric quantity of the low-voltage users under each switch station is acquired by a user electric quantity information acquisition system.
The coverage rate of the user power utilization information acquisition system reaches 100%, and the power information of all power users can be monitored in real time.
Further, in the sub-step of judging, the sub-step of judging the line loss rate is executed after the line loss range is reduced to the switching station with unbalanced bus load rate: calculating the line loss rate of the switching station with unbalanced bus load rate, comparing the calculated line loss rate of the switching station with the line loss rate which is calculated in the step two and exceeds the limit value, and if the line loss rate of the switching station is less than the line loss rate which is calculated in the step two and exceeds the limit value, continuing to execute the sub-judgment step; otherwise, the range of the line loss abnormality is determined as the inside of the switchyard.
When the line loss rate is abnormal, the problem of the lower branch line of only one switching station is not necessary, so that under the condition that the line loss rate of one switching station is determined to be abnormal, whether the switching station is only one switching station with abnormal line loss needs to be judged, if the line loss rate of the switching station is smaller than the calculated line bus loss rate, the other switching stations with abnormal line loss rates need to be continuously checked.
Further, each of the switchyard power distribution data includes a switchyard loop-in active power and a switchyard loop-out active power.
The power supply quantity required by calculating the line loss rate can be calculated through the active power of the incoming ring of the switching station and the active power of the outgoing ring of the switching station.
Furthermore, the voltage of each switch station is connected to the DTU equipment, and the DTU equipment is used for uploading the collected power distribution data of each switch station to a power distribution automation real-time library.
And further, when the line loss rate calculated in the step two exceeds the limit value, the power distribution automation system gives an alarm.
The line loss rate of the line can be monitored in real time, an alarm can be given in time when a problem occurs, and a maintainer can carry out quick maintenance, so that the reliability of a power supply system is improved.
Further, the line loss rate includes a daily line loss rate and a monthly line loss rate, and the daily line loss rate calculation formula is as follows:
wherein:
the active power sum of the ring-in switches of the first switchyard in a day,
the sum of the active power of the switches is looped out for the first switching station in a day,
the total loss of active power in the ring network station of the first switching station in one day, A is the daily line loss rate, delta WMThe sum of all users' active power usage under the first switchyard in a day.
Further, the monthly line loss rate is obtained by counting daily line loss rate data obtained by daily calculation within one month, and the daily line loss rate data and the monthly line loss rate data are both stored in a distribution automation real-time library.
Further, the daily line loss rate data is displayed in a curve form in the distribution automation system in real time.
The line loss rate is conveniently queried in real time by a maintainer, the curve form is more visual, the maintainer can directly acquire the line loss abnormal degree of an abnormal time period according to an image, and data stored in a distribution automation real-time library can be called and consulted at any time.
Further, the topological relation between the line and the user in the third step is led into the power distribution automation system through the user power utilization information acquisition system.
The invention has the beneficial effects that:
carry out the real time monitoring of line loss to every switchyard through distribution automation system, in case the line loss rate of circuit appears unusually, just open the investigation one by one to the switchyard, confirm the unusual scope of line loss, make things convenient for the maintainer to carry out the investigation of the unusual reason of line loss fast. And when the line loss of the line is abnormal, the alarm can be given in time, the reaction time and the maintenance time of maintenance personnel are reduced, and the reliability of a power supply system is improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is a graph of the daily loss according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example (b):
a line loss abnormal segmented management and control method, as shown in fig. 1, includes the following steps:
the method comprises the following steps: based on a power distribution automation system, the power distribution automation system comprises a plurality of switching stations, and power distribution data of each switching station is collected by taking the switching station as a minimum unit;
step two: collecting daily frozen electric quantity data of low-voltage users under each switch station, setting a line loss rate limit value, calculating the power supply quantity, the electricity selling quantity, the loss electric quantity and the line loss rate of each switch station according to a line loss algorithm, and executing a third step if the calculated line loss rate exceeds the limit value;
step three: setting a time period and selecting a switching station, and executing a judgment substep, wherein the judgment substep specifically comprises the following steps: according to the power supply amount calculated in the second step, in combination with a topological relation between a line and a user, comparing the power supply amount of the switching station with the daily frozen power amount of a low-voltage user under the switching station in a set time period, judging whether the bus load rate of the switching station is balanced, and if the result of the substep is that the bus load rate of the switching station is unbalanced, reducing the range of abnormal line loss into the switching station; if so, selecting the remaining one of the switchyard of the power distribution automation system and continuing to execute the sub-determining step.
And the data of the daily frozen electric quantity of the low-voltage users under each switching station is acquired by a user electricity utilization information acquisition system.
In the judging substep, the line loss rate judging substep is executed after the line loss range is reduced to the switching station with unbalanced bus load rate: calculating the line loss rate of the switching station with unbalanced bus load rate, comparing the calculated line loss rate of the switching station with the line loss rate which is calculated in the step two and exceeds the limit value, and if the line loss rate of the switching station is less than the line loss rate which is calculated in the step two and exceeds the limit value, continuing to execute the sub-judgment step; otherwise, the range of the line loss abnormality is determined as the inside of the switchyard.
And each switching station power distribution data comprises switching station loop-in active power and switching station loop-out active power.
The voltage of each switch station is connected to the DTU equipment, and the DTU equipment is used for uploading collected power distribution data of each switch station to a power distribution automation real-time library.
And when the line loss rate calculated in the step two exceeds the limit value, the power distribution automation system gives an alarm.
The line loss rate comprises a daily line loss rate and a monthly line loss rate, and the daily line loss rate is calculated according to the following formula:
wherein:
the active power sum of the ring-in switches of the first switchyard in a day,
the sum of the active power of the switches is looped out for the first switching station in a day,
the total loss of active power in the ring website of the first switching station in one day, A is the daily line loss rate,
the sum of all users' active power usage under the first switchyard in a day.
The monthly line loss rate is obtained by counting daily line loss rate data obtained by daily calculation in one month, and the daily line loss rate data and the monthly line loss rate data are stored in a distribution automation real-time library. The line loss monitoring and warning system is integrated in an existing power distribution automation system unified area.
As shown in fig. 2, the daily line loss rate data is displayed in a curve form in the distribution automation system in real time, and can be queried and filtered on a foreground interface of the distribution automation system.
And in the third step, the topological relation between the line and the user is led into the power distribution automation system through the user power utilization information acquisition system.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. A line loss abnormal segmented control method is characterized by comprising the following steps:
the method comprises the following steps: based on a power distribution automation system, the power distribution automation system comprises a plurality of switching stations, and power distribution data of each switching station is collected by taking the switching station as a minimum unit;
step two: collecting daily frozen electric quantity data of low-voltage users under each switch station, setting a line loss rate limit value, calculating the power supply quantity, the electricity selling quantity, the loss electric quantity and the line loss rate of each switch station according to a line loss algorithm, and executing a third step if the calculated line loss rate exceeds the limit value;
step three: setting a time period and selecting a switching station, and executing a judgment substep, wherein the judgment substep specifically comprises the following steps: according to the power supply amount calculated in the second step, in combination with a topological relation between a line and a user, comparing the power supply amount of the switching station with the daily frozen power amount of a low-voltage user under the switching station in a set time period, judging whether the bus load rate of the switching station is balanced, and if the result of the substep is that the bus load rate of the switching station is unbalanced, reducing the range of abnormal line loss into the switching station; if so, selecting the remaining one of the switchyard of the power distribution automation system and continuing to execute the sub-determining step.
2. The line loss abnormal segmented control method according to claim 1, wherein the daily frozen electric quantity data of the low-voltage users under each switching station is acquired by a user electric quantity information acquisition system.
3. The method according to claim 1, wherein in the sub-step of determining, the sub-step of determining the line loss rate is further performed after the line loss range is narrowed to the switchyard with unbalanced bus load rate: calculating the line loss rate of the switching station with unbalanced bus load rate, comparing the calculated line loss rate of the switching station with the line loss rate which is calculated in the step two and exceeds the limit value, and if the line loss rate of the switching station is less than the line loss rate which is calculated in the step two and exceeds the limit value, continuing to execute the sub-judgment step; otherwise, the range of the line loss abnormality is determined as the inside of the switchyard.
4. The method according to claim 1, wherein the power distribution data of each switchyard comprises switchyard loop-in active power and switchyard loop-out active power.
5. The method according to claim 1, wherein the voltage of each switching station is connected to a DTU device, and the DTU device is configured to upload the collected power distribution data of each switching station to a power distribution automation real-time library.
6. The line loss abnormal segmented control method according to claim 1, wherein when the line loss rate calculated in the second step exceeds a limit value, the power distribution automation system sends an alarm.
7. The method according to claim 1, wherein the line loss rate includes a daily line loss rate and a monthly line loss rate, and the daily line loss rate is calculated according to the following formula:
wherein:
the active power sum of the ring-in switches of the first switchyard in a day,
the sum of the active power of the switches is looped out for the first switching station in a day,
the total loss of active power in the ring network station of the first switching station in one day, A is the daily line loss rate, delta WMThe sum of all users' active power usage under the first switchyard in a day.
8. The line loss abnormality segmented control method according to claim 7, wherein the monthly line loss rate is obtained by counting daily line loss rate data calculated every day in one month, and the daily line loss rate data and the monthly line loss rate data are both stored in a distribution automation real-time base.
9. The method according to claim 8, wherein the daily line loss rate data is displayed in a curve form in a distribution automation system in real time.
10. The method according to claim 1, wherein in step three, the topological relation between the line and the user is imported into a distribution automation system through a user electricity consumption information collection system.
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| CN114114121A (en) * | 2021-11-19 | 2022-03-01 | 四川九州电子科技股份有限公司 | Method for quickly and automatically calibrating WIFI static test link line loss |
| CN115808589A (en) * | 2023-02-06 | 2023-03-17 | 国网江苏省电力有限公司电力科学研究院 | Power distribution network time-sharing segmentation line loss abnormity diagnosis method and device |
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