CN110880709A - Method for determining ice-watching dispatching time of power transmission line - Google Patents
Method for determining ice-watching dispatching time of power transmission line Download PDFInfo
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- CN110880709A CN110880709A CN201911009598.XA CN201911009598A CN110880709A CN 110880709 A CN110880709 A CN 110880709A CN 201911009598 A CN201911009598 A CN 201911009598A CN 110880709 A CN110880709 A CN 110880709A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
Abstract
The invention discloses a method for determining ice observation and dispatching time of a power transmission line, which comprises the following steps of: A. acquiring time node data of operation items in a plurality of historical operation tickets; B. calculating the duration of each operation item according to the time node data; C. screening out inferior data in the time length data calculated in the step B; D. calculating the average value of the remaining time length data after screening, summing the average time lengths of all the operation items to calculate the total time length from the start of ice-melting work to the start of the current line flow, wherein the total time length is combined with the start time of the current ice-melting work to calculate the start time of the current line flow: e: the ice observation dispatching time is determined according to the current line rising moment and the travel time of the ice observation personnel, so that the ice observation personnel can spread the ice observation work after arriving at an ice observation place, and the invalid waiting of the ice observation personnel in the environment with severe climate is avoided.
Description
Technical Field
The invention relates to the field of power grid operation and maintenance, in particular to a method for determining ice observation and dispatching time of a power transmission line.
Background
In severe winter, the phenomenon of icing on the transmission line can occur, which endangers the safety of the transmission line, a power supply bureau can take deicing measures, and the main means for eliminating the icing of the transmission line include direct-current deicing, ice thawing in a mode and the like.
Disclosure of Invention
In order to solve the problems, the method for determining the ice-watching dispatching time of the power transmission line comprises the following steps:
A. acquiring time node data of operation items in a plurality of historical operation tickets;
B. calculating the duration of each operation item according to the time node data;
C. screening out inferior data in the time length data calculated in the step B;
D. calculating the average value of the remaining time length data after screening, summing the average time lengths of all the operation items to calculate the total time length from the start of ice-melting work to the start of the current line flow, wherein the total time length is combined with the start time of the current ice-melting work to calculate the start time of the current line flow:
e: and determining the ice observing and dispatching time according to the current line starting upwelling moment and the travel time of ice observing personnel.
The method has the advantages that the time node of each operation item is obtained from a historical operation ticket, the operation duration of each item is calculated, normal duration data is screened out, and the time for dispatching is calculated according to the ice melting process, so that ice observation work can be performed after an ice observer arrives at an ice observation place, and invalid waiting of the ice observer in a severe climate environment is avoided.
Drawings
The invention is further illustrated by the attached drawings, the examples of which are not to be construed as limiting the invention in any way.
FIG. 1 is a flow chart of dispatch time determination in one embodiment of the present invention;
FIG. 2 is a schematic diagram of a distribution of a non-discrete random variable model in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the comparison of the ice-melting and ice-viewing processes according to an embodiment of the present invention.
Detailed Description
The following is a detailed illustration of the inventive concept in connection with the examples, and should not be taken to limit the scope of the invention, but rather as an aid to understanding the principles.
Example (b): as shown in fig. 1-3
A method for determining ice observation and dispatching time of a power transmission line comprises the following steps:
A. acquiring time node data of operation items in a plurality of historical operation tickets;
B. calculating the duration of each operation item according to the time node data;
C. screening out inferior data in the time length data calculated in the step B;
D. calculating the average value of the remaining time length data after screening, summing the average time lengths of all the operation items to calculate the total time length from the start of ice-melting work to the start of the current line upwelling, and calculating the time of the current line upwelling by combining the total time length with the current ice-melting work start time:
e: and determining the ice observing and dispatching time according to the current line starting upwelling moment and the travel time of ice observing personnel.
Preferably, in step a, the time node data includes a time t when the operation line route operation is started to be changed to maintenancer0And the time t when the line is changed from running to overhauling operationr1And the time t for starting the maintenance of the operation line to change to cold standbyr2Time t when the line is switched from maintenance to cooling standby operationrs。
Preferably, in step B, the calculated operation item duration includes:
time length T for line operation to maintenance operationr1Characterized by Tr1＝tr1-tr0(1)
Ice melting equipment installation operation duration Tr2Characterized by Tr2＝tr2-tr1(2)
Line route maintenance cold-transfer standby operation duration Tr3Characterized by Tr3＝trs-tr2(3)。
Preferably, the poor quality data includes a length of time that the item was operated in the presence of a faulty repair.
The operation ticket is a proof of power grid operation, information of each operation project is recorded, time node data of each project is included in the information, the time node data are extracted, the consumed time of each project is calculated, and some special conditions may occur in the process of carrying out direct current ice melting work on the power transmission line, so that some time node data obviously deviate from a normal range. For example, if equipment such as a switch, a disconnecting link, a grounding switch, an ice melting device and the like fails, temporary shortage needs to be eliminated, and the time consumption of corresponding link operation is very long; if the line is in a cold standby or overhaul state before the ice melting operation is started, the time consumption of the corresponding link is very short (relevant time nodes cannot be extracted from an operation ticket, and the time consumption of some links for solving is zero or infinite). Therefore, when the expected value of time consumption of each link is calculated, the data of the special situation needs to be eliminated, so that more reasonable data is obtained, the inferior data is relative to a normal operation project, for the operation duration of a certain project, the time consumption is relatively stable under the normal condition according to the operation rule of a power grid, the dispatching time is calculated by combining the current ice melting process, and invalid waiting of ice watching personnel is avoided.
Preferably, the inferior data is screened out by establishing a non-discrete random variable model.
Aiming at any link, the length of time obtained by solving the same line or the line with the same type of ice melting devices by multiple ice melting work is expanded and collected in a data set to form a non-discrete immediate variable T, the probability density curve of the immediate variable is shown in the figure, wherein P is the distribution function of T, T is any non-negative real number, the length of time data of the minimum delta and the maximum delta is regarded as inferior data, and the inferior data is screened out in the calculation, namely the white bottom part (T is more than or equal to T) in the figure1And T is less than or equal to T2) For bad data, shaded parts (t)1＜T＜t2) For normal data, t is solved by the following equation1、t2：
P{T≤t1}＝0.2
P{T≤t2}＝0.8
Preferably, in the step D, a time length data average value is calculated through weighted average, the weighted values are distributed from long to short correspondingly from small to large according to the time interval between the historical operation ticket where the time length data is located and the current ice-melting operation, and the sum of the weighted values is equal to 1.
For the screened duration data, an average value is obtained to be used as a basis for summing the operation durations of all projects, for the whole power grid unit, a general operation specification exists, each unit operates on the premise of not violating the specification according to the characteristics of the unit, for a certain unit, the operation duration of a certain link is mainly determined by the equipment quality and the technical level of operators when ice melting work is carried out, for example, the ice melting equipment of a certain power supply office is early in purchasing age, the equipment is aged to a certain degree, the time spent in installation operation is longer than that of the current advanced equipment, when the same equipment is operated, the experienced operators are faster than the new employees, or the equipment is updated, due to the technical development, the connection structure of the new equipment and the response mechanism are accelerated, which all affect the project operation durations, or the operator in charge of the ice melting operation changes the person, so that for a certain power supply unit, the data information in the recent ice melting operation ticket is more reliable, and the weight of the time length data close to the current ice melting operation time interval is larger during weighted average.
Preferably, in step D, the calculation of the current line upwelling starting time is characterized by:
in the formula, tdkFor the time of starting up-flow of the current line, tg0The current line is changed from operation to maintenance,
and respectively carrying out weighted average values of the time length of the operation of the line from running to maintenance, the time length of the installation operation of the ice melting equipment and the time length of the operation of the line from maintenance to cold standby.
The line is changed from operation to maintenance, namely, the power supply of a normal line is stopped, a maintenance state is carried out, a key node needs to be disconnected, and the reliable short circuit of the line stroke is ensured; the ice melting equipment installation mainly relates to the operations that an ice melting device is arranged at the head end of a line, and the three phases at the tail end are in short circuit, grounded and the like; the line is changed from maintenance to cold standby, namely, a series of debugging and inspection work is carried out after the ice melting device is installed, and the cold standby mainly refers to the resting state of the line.
Preferably, in step E, the ice-watching dispatching time is characterized as:
tgp＝tdk-Tp(5)
in the formula, tgpDispatching time for ice observation, TpWhen the ice-watching person travels.
Through the calculation process, the accurate line upwelling time is obtained, and the dispatching time can be calculated by combining the travel time of the ice observing person, wherein the travel time of the ice observing person mainly comprises the preparation working time T after receiving the ice observing noticeg1And a time period T for traveling to an ice siteg2，Tg2Can be determined by specialized navigation equipment.
For the ice observing personnel, the early-stage operation of the ice observing work further comprises a waiting time length delta Tg, and the expected value of delta Tg is set to be 0, namely the waiting value is eliminated as a target.
In the description of the embodiments of the invention, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the embodiments of the present invention, it should be understood that "-" and "-" indicate the same range of two numerical values, and the range includes the endpoints. For example: "A-B" means a range of greater than or equal to A and less than or equal to B. "A to B" means a range of not less than A and not more than B.
In the description of the embodiments of the present invention, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for determining ice observation and dispatching time of a power transmission line is characterized by comprising the following steps:
A. acquiring time node data of operation items in a plurality of historical operation tickets;
B. calculating the duration of each operation item according to the time node data;
C. screening out inferior data in the time length data calculated in the step B;
D. calculating the average value of the remaining time length data after screening, summing the average time lengths of all the operation items to calculate the total time length from the start of ice-melting work to the start of the current line flow, wherein the total time length is combined with the start time of the current ice-melting work to calculate the start time of the current line flow:
e: and determining the ice observing and dispatching time according to the current line starting upwelling moment and the travel time of ice observing personnel.
2. The method according to claim 1, wherein in step a, the time node data includes a time t when the operation line route starts to run and transit for maintenancer0And the time t when the line is changed from running to overhauling operationr1And the time t for starting the maintenance of the operation line to change to cold standbyr2Time t when the line is switched from maintenance to cooling standby operationrs。
3. The method according to claim 1, wherein the step B of calculating the duration of the operation items comprises:
time length T for line operation to maintenance operationr1Characterized by Tr1＝tr1-tr0(1)
Ice melting equipment installation operation duration Tr2Characterized by Tr2＝tr2-tr1(2)
Line route maintenance cold-transfer standby operation duration Tr3Characterized by Tr3＝trs-tr2(3)。
4. The method as claimed in claim 1, wherein the bad data includes a time period of operation of the project in which the fault repair exists.
5. The method according to claim 1, wherein the bad data is screened out by establishing a non-discrete random variable model.
6. The method according to claim 1, wherein in step D, a time-length data average value is calculated by weighted averaging, the weight values are distributed from small to large according to the correspondence from long to short between the historical operation ticket where the time-length data is located and the current ice-melting operation time interval, and the sum of the weight values is equal to 1.
7. The method as claimed in claim 1 or 6, wherein in the step D, the calculation of the current line upwelling starting time is characterized by:
in the formula, tdkFor the time of starting up-flow of the current line, tg0The current line is changed from operation to maintenance,
and respectively carrying out weighted average values of the time length of the operation of the line from running to maintenance, the time length of the installation operation of the ice melting equipment and the time length of the operation of the line from maintenance to cold standby.
8. The method according to claim 1, wherein in step E, the ice observation dispatching time is characterized as:
tgp＝tdk-Tp(5)
in the formula, tgpDispatching time for ice observation, TpWhen the ice-watching person travels.
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