CN109510205B - Power distribution network load transfer auxiliary decision analysis method - Google Patents
Power distribution network load transfer auxiliary decision analysis method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention belongs to the technical field of power systems, and relates to an auxiliary decision analysis method for load transfer of a power distribution network. The method comprises the following steps of 1) checking the load transfer safety of the power distribution network; 2) verifying the load transfer reliability of the power distribution network; 3) carrying out correction verification on the load transfer of the power distribution network; 4) and the load of the power distribution network is transferred to the optimal scheme for selection. The invention overcomes the defects of long load transfer time, low efficiency and poor reliability caused by the fact that the traditional power distribution network load transfer is mainly calculated roughly by a regulation and control worker, ensures the safety, reliability and high efficiency of the power distribution network load transfer, and improves the safety production and high-quality service level of the power distribution network.
Description
Technical Field
The invention belongs to the technical field of power systems, and relates to an auxiliary decision analysis method for load transfer of a power distribution network.
Background
The power distribution network directly faces thousands of households, is a key link for guaranteeing the power supply reliability of users, and line faults of the power distribution network are frequent due to the fact that the power distribution network is complex in structure, various in line elements and bad in operation environment. In order to guarantee the power supply reliability, except for the self fault of the power distribution network, the load of the power distribution network needs to be transferred when accidents such as emergency defect elimination of an upper-level power grid, internal faults of a transformer substation and the like are processed.
At present, a current value regulating and controlling personnel determines a supply transfer scheme through manual rough calculation and operation experience according to the current load of a line, the supply transfer efficiency is low, the reliability is poor, and under the development situation that the wiring of a power distribution network is gradually complicated, the complicated and random load transfer is increased for the regulating and controlling personnel, so that the safety production of the power distribution network faces severe examination. The line load can not be deeply researched and judged only by manually calculating and determining the supply transfer line by regulating and controlling personnel, the overload of the supply transfer line is easily caused when the load is heavier, the running condition and the special mode of the supply transfer line are difficult to comprehensively analyze, and if the load is transferred to the line with high failure rate, the accident is easily expanded, so that the power supply reliability of a user and the good image of the high-quality service of a power grid enterprise are seriously influenced.
Disclosure of Invention
In order to overcome the defects of the existing power distribution network load transfer method, the invention provides an auxiliary decision analysis method for power distribution network load transfer, which can help a regulation and control person to select an optimal scheme for load transfer during accident handling.
The invention is realized by adopting the following technical scheme, and the power distribution network load transfer auxiliary decision analysis method comprises the following steps:
1) the load transfer safety of the power distribution network is verified;
2) verifying the load transfer reliability of the power distribution network;
3) carrying out correction verification on the load transfer of the power distribution network;
4) and the load of the power distribution network is transferred to the optimal scheme for selection.
The dispatching automation system is a power grid operation control technology support system commonly used by power industry regulators, such as D5000 and D5200 systems produced by Nanrui.
The specific steps of the power distribution network load transfer safety verification in the step (1) comprise:
1-1) reading the load curves of the line to be transferred out and the first 3 days history of all transferable lines from the dispatching automation system;
1-2) adding and synthesizing the load curves of the lines to be transferred out and the load curves of the lines which can be transferred in one by one, and eliminating abnormal loads during the adjustment of the lines which are transferred in and out in a conventional mode;
according to the requirement of load transfer time, extracting the first time interval from the synthesized load curve of the first 3 days historykMaximum load of strip composite lineI kmax ，k=1，2，…，m，mCalculating the transfer safety coefficient of each transfer line for the number of the connecting lines of the line to be transferred outS k ，
In the formulaI kN Is as followskThe current carrying quota of the strip-to-line; if it isS k If the number of the lines passing the safety check is less than or equal to 0.9, the line passes the safety check, and the number of all the lines passing the safety check is recorded asnIf, ifnAnd (3) if the load of the transferred-in line is not less than 1, entering the step (2) for reliability verification, otherwise, indicating that all the transferred-in lines do not pass the safety verification, and the load of the transferred-out line cannot be transferred, and ending the process, namely, the lines which do not pass the safety verification do not enter the reliability verification.
The specific steps of the power distribution network load transfer reliability verification in the step (2) comprise:
2-1) reading historical data of permanent faults of each line from a dispatching automation system, dividing the historical fault data into a single-phase grounding pull circuit and a protection action trip circuit, respectively counting the frequency of the two faults of each line to form a historical fault database, and timely updating the database according to the real-time running condition of a power grid;
2-2) taking the year as a unit, taking the historical fault times obtained in the step 2-1) as an abscissa and taking the number of lines as an ordinate, and obtaining a distribution diagram of the annual whole-network line fault times, wherein the number of lines is increased along the direction of the ordinate;
2-3) obtaining the distribution characteristics of annual fault times of the past years according to the annual whole network line fault time distribution diagram obtained in 2-2), and determining the annual fault time green alarm limit valueL AYellow alarm limitL B；
2-4) the number of the historical faults of each transferable line passing the safety verification in the current yearL 1AndL 2after adding up, the sum is compared with the corresponding alarm limit value to obtain the risk level, whereinL 1Showing the number of single-phase ground pulling in the year,L 2representing the trip times of the protection action in the current year;
2-5) selecting the transferable line with the lowest risk level, and recording the number of lines aslAnd make corresponding risk control, e.g.lAnd (4) if the load is more than or equal to 1, entering the step (3) of power distribution network load transfer correction verification.
The method for obtaining the risk grade through comparison comprises the following steps:
a) If it isL 1＋L 2<L AIf the alarm is green, the reliability of the switched-in line is high, and the monitoring of the switched-in line is enhanced by regulation and control personnel;
b) If it isL A≤L 1＋L 2≤L BIf the line is yellow, early warning is carried out, the reliability of the switched-in line is general, and the regulation and control personnel can comprehensively analyze the switched-in dangerous points to make accident prediction;
c) If it isL 1＋L 2>L BAnd if the alarm is red, the reliability of the switched-in line is low, and the regulation and control personnel should make an accident handling plan to inform operation and maintenance personnel to strengthen inspection tour and inform marketing departments to make important user power conservation.
The method for correcting the load transfer of the power distribution network comprises the following steps:
3-1) calculating correction coefficients of all switching-in lines with the same risk level according to special operation modes and current operation requirements of the switching-in linesM i ，
Wherein M (1) represents that the line has important power protection and the value is-4; m (2) represents that the circuit has a small power supply reclosing and exits, and the value of the reclosing and exiting is-2; m (3) represents that the fixed value of the line switching protection needs to be adjusted, and the value is-1; m (4) represents that the line has no special operation requirement and has a value of 0;
3-2) arranging the switched-in lines with the same risk grade obtained in the step 3-1) according to the sequence of the correction coefficients from large to small to form a load switching-in priority sequence table.
And (4) determining the optimal transfer-in line by a regulating and controlling person according to the priority list obtained in the step (3-2).
The method is feasible, overcomes the defects of long load transfer time, low efficiency and poor reliability caused by the fact that load transfer is performed by manual rough calculation of a traditional power distribution network load transfer by mainly depending on a proper value regulating and controlling person, performs safety verification on the load transfer according to a historical load curve of a line, performs reliability verification on the load transfer according to historical fault data of the line, and performs correction verification on the load transfer according to a special operation mode and the current operation requirement of the line, so that the load transfer of the power distribution network is enabled to be implemented safely, reliably and efficiently, and the safety production and the high-quality service level of the power distribution network are improved powerfully.
Drawings
The invention will be further explained with reference to the drawings, in which:
FIG. 1 is a flow chart of an auxiliary decision analysis method for load transfer of a power distribution network according to the present invention;
FIG. 2 is a flow chart of a method for verifying load transfer safety of a power distribution network;
fig. 3 is a flowchart of a method for verifying load transfer reliability of a power distribution network.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited to the following embodiments.
As shown in fig. 1, the power distribution network load transfer auxiliary decision analysis method of the present invention includes the following steps:
step 1, checking the load transfer safety of a power distribution network;
fig. 2 is a flowchart of a power distribution network load transfer security verification method, in this embodiment, a line to be transferred and previous 3-day history load curves of all transferable lines thereof are read from a scheduling automation system, the line load curves to be transferred and the load curves of the transferable lines are added and synthesized one by one, abnormal changes of line loads are caused by conventional adjustment such as a transfer-in and transfer-out line loop test, a planned power outage transfer load and the like, in order to eliminate prediction of a maximum transfer load during a fault by the conventional adjustment, after the adjustment is performed by a regulator in each conventional manner, loads before the transfer-in and transfer-out line loads are adjusted in the manner are stored, and peak loads during the conventional adjustment of the transfer-in and transfer-out lines are eliminated. According to the requirement of load transfer time, extracting the first time interval from the synthesized load curve of the first 3 days historykMaximum load of strip composite lineI kmax ，k=1，2，…，m，mCalculating the transfer safety coefficient of each transfer line for the number of the connecting lines of the line to be transferred outS k ，
In the formulaI kN Is as followskThe strip shifts into the current carrying quota of the line. According to the requirements of safe operation and alarm limit of the power distribution network line, if soS k If the number of the lines passing the safety check is less than or equal to 0.9, the line passes the safety check, and the number of all the lines passing the safety check is recorded asnIf, ifnIf the load of the switched-in line is not less than 1, the reliability check is carried out, otherwise, the safety check is not passed by all the switched-in lines, and the load of the switched-out line cannot be switched.
Step 2, verifying the load transfer reliability of the power distribution network;
FIG. 3 shows a method for verifying load transfer reliability of a power distribution networkIn the flow chart, in this embodiment, historical data of each line with a permanent fault is read from the dispatching automation system, the historical fault data is divided into a single-phase ground pull-out type and a protection action trip type, the frequency of the two types of faults occurring on each line is respectively counted to form a historical fault database, and the historical fault database is updated in time according to the real-time operation condition of the power grid. The expression forms of the same fault of one line can be mutually converted, the fault can be expressed as single-phase grounding, the fault is developed into line tripping after a period of time, or the fault is successfully tripped and is developed into fault reclosing after a period of time, the principle that the same fault is counted once is taken as one time, the accuracy and the integrity of data are ensured, if the single-phase grounding is generated and is accompanied with the line tripping, the fault is uniformly marked as single-phase grounding pulling, and if the fault is successfully tripped and is developed into fault reclosing, the fault is uniformly marked as protection action tripping. Taking the year as a unit, taking the historical fault times as an abscissa and the line number (in the order from less to more) as an ordinate to obtain a distribution diagram of the annual whole network line fault times, and determining the annual fault time alarm green alarm limit value according to the distribution characteristics of the annual fault times of the past yearsL AYellow alarm limitL B. The average frequency of 20 percent of the total network failure frequency distribution in 3-5 years can be taken as the green alarm limit valueL ATaking the average frequency of 70% before the frequency distribution of the faults of the whole network in 3-5 years as a yellow alarm limit valueL BThe number of historical faults of each transferable line passing the safety verification in the current yearL 1、L 2After adding, comparing with the corresponding alarm limit value to obtain the risk grade, L 1the number of single-phase ground pulling is shown,L 2the number of tripping times of the protection action is represented as follows:
a) If it isL 1＋L 2<L AGreen early warning, the reliability of the switching-in line is higher, and the monitoring of the switching-in line is enhanced by regulation and control personnel;
b) If it isL A≤L 1＋L 2≤L BYellow early warning, turning to lineThe road reliability is general, and regulating personnel should comprehensively analyze and transfer to dangerous points to make accident prediction;
c) If it isL 1＋L 2>L BAnd red early warning is carried out, the reliability of the switched-in line is lower, and the regulation and control personnel should make an accident handling plan, inform operation and maintenance personnel to strengthen inspection tour and inform marketing departments to make important user power conservation.
Selecting the transferable line with the lowest risk level, and recording the number of lines aslAnd make corresponding risk control, e.g.lAnd if the value is more than or equal to 1, entering corrective verification.
Step 3, calculating correction coefficients of all the switched-in lines with the same risk level according to the special operation mode and the current operation requirement of the switched-in linesM i ，
WhereinM(1) Indicating that the line has an important power reserve, which is-4,M(2) the circuit is indicated to have a small power supply reclosing exit, the value is-2,M(3) indicating that the line switching protection setting value needs to be adjusted, the value is-1,M(4) indicating that the line has no special operating requirements and has a value of 0. And the transfer-in lines with the same risk level are arranged from large to small according to the correction coefficient to form a load transfer priority sequence list.
And 4, determining the optimal transfer-in line by the regulating personnel according to the priority sequence table.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any simple modification or change made without departing from the spirit of the present invention is within the protection scope of the present invention.
Claims (1)
1. A power distribution network load transfer auxiliary decision analysis method is characterized by comprising the following steps:
1) the load transfer safety of the power distribution network is verified;
2) verifying the load transfer reliability of the power distribution network;
3) carrying out correction verification on the load transfer of the power distribution network;
4) selecting a power distribution network load transfer optimal scheme;
the specific steps of the power distribution network load transfer safety verification in the step (1) comprise:
1-1) reading the load curves of the line to be transferred out and the first 3 days history of all transferable lines from the dispatching automation system;
1-2) adding and synthesizing the load curves of the lines to be transferred out and the load curves of the lines which can be transferred in one by one, and eliminating abnormal loads during the adjustment of the lines which are transferred in and out in a conventional mode;
according to the requirement of load transfer time, extracting the first time interval from the synthesized load curve of the first 3 days historykMaximum load of strip composite lineI kmax ，k=1，2，…，m，mCalculating the transfer safety coefficient of each transfer line for the number of the connecting lines of the line to be transferred outS k ，
In the formulaI kN Is as followskThe current carrying quota of the strip-to-line; if it isS k If the number of the lines passing the safety check is less than or equal to 0.9, the line passes the safety check, and the number of all the lines passing the safety check is recorded asnIf, ifnIf the load of the transferred-in line is not less than 1, entering the step (2) of reliability verification, otherwise, indicating that all the transferred-in lines do not pass the safety verification, and the load of the transferred-out line cannot be transferred, and ending the process, namely, the lines which do not pass the safety verification do not enter the reliability verification;
the specific steps of the power distribution network load transfer reliability verification in the step (2) comprise:
2-1) reading historical data of permanent faults of each line from a dispatching automation system, dividing the historical fault data into a single-phase grounding pull circuit and a protection action trip circuit, respectively counting the frequency of the two faults of each line to form a historical fault database, and timely updating the database according to the real-time running condition of a power grid;
2-2) taking the number of the historical faults obtained in the step (2-1) as an abscissa and the number of lines as an ordinate to obtain a distribution map of the number of the faults of the whole network of the year, wherein the number of the lines is increased along the direction of the ordinate;
2-3) obtaining the distribution characteristics of annual whole network fault times in the past year according to the annual whole network fault time distribution diagram obtained in the step 2-2, and determining the annual fault time green alarm limit valueL AYellow alarm limitL B；
2-4) the number of the historical faults of each transferable line passing the safety verification in the current yearL 1AndL 2after adding up, the sum is compared with the corresponding alarm limit value to obtain the risk level, whereinL 1Showing the number of single-phase ground pulling in the year,L 2representing the trip times of the protection action in the current year;
2-5) selecting the transferable line with the lowest risk level, and recording the number of lines aslAnd make corresponding risk control, e.g.lIf the load is more than or equal to 1, entering the step (3) of correcting the load transfer of the power distribution network;
the method for obtaining the risk grade through comparison in the step (2-4) comprises the following steps:
a) If it isL 1＋L 2<L AIf the alarm is green, the reliability of the switched-in line is high, and the monitoring of the switched-in line is enhanced by regulation and control personnel;
b) If it isL A≤L 1＋L 2≤L BIf the line is yellow, early warning is carried out, the reliability of the switched-in line is general, and the regulation and control personnel can comprehensively analyze the switched-in dangerous points to make accident prediction;
c) If it isL 1＋L 2>L BIf the alarm is red, the reliability of the switched-in line is low, and the regulation and control personnel should make an accident handling plan to inform operation and maintenance personnel to strengthen inspection tour and inform marketing departments to make important user power conservation;
the method for correcting the load transfer of the power distribution network comprises the following steps:
3-1) calculating correction coefficients of all switching-in lines with the same risk level according to special operation modes and current operation requirements of the switching-in linesM i ，
Wherein M (1) represents that the line has important power protection and the value is-4; m (2) represents that the circuit has a small power supply reclosing and exits, and the value of the reclosing and exiting is-2; m (3) represents that the fixed value of the line switching protection needs to be adjusted, and the value is-1; m (4) represents that the line has no special operation requirement and has a value of 0;
3-2) arranging the switched-in lines with the same risk grade obtained in the step (3-1) according to the sequence of the correction coefficients from large to small to form a load switching-in priority sequence list;
and (4) determining the optimal transfer-in line by a regulating and controlling person according to the priority list obtained in the step (3-2).
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| CN110299708B (en) * | 2019-07-10 | 2022-08-12 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network load transfer auxiliary decision-making method and system |
| CN110263078B (en) * | 2019-08-14 | 2019-11-29 | 广东电网有限责任公司佛山供电局 | A kind of distribution line heavy-overload Intelligent statistical method |
| CN113541128B (en) * | 2021-06-24 | 2023-07-07 | 深圳供电局有限公司 | Distribution network feeder power supply transfer method, device, computer equipment and storage medium |
| CN115603465B (en) * | 2022-11-07 | 2023-11-07 | 安徽网华信息科技有限公司 | Power distribution network load transfer data monitoring and controlling system and method based on big data |
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Effective date of registration: 20200907 Address after: No. 2481 Suqian City, Jiangsu province 223800 Avenue development Sucheng District Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. SUQIAN POWER SUPPLY BRANCH Address before: No. 2481 Suqian City, Jiangsu province 223800 Avenue development Sucheng District Applicant before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. SUQIAN POWER SUPPLY BRANCH Applicant before: STATE GRID JIANGSU ELECTRIC POWER Co. Applicant before: STATE GRID CORPORATION OF CHINA |
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Effective date of registration: 20201119 Address after: No. 2481 Suqian City, Jiangsu province 223800 Avenue development Sucheng District Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. SUQIAN POWER SUPPLY BRANCH Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co. Applicant after: STATE GRID CORPORATION OF CHINA Address before: No. 2481 Suqian City, Jiangsu province 223800 Avenue development Sucheng District Applicant before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. SUQIAN POWER SUPPLY BRANCH |
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