CN106327088B - Distribution line load rate calculation method - Google Patents
Distribution line load rate calculation method Download PDFInfo
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- CN106327088B CN106327088B CN201610739634.8A CN201610739634A CN106327088B CN 106327088 B CN106327088 B CN 106327088B CN 201610739634 A CN201610739634 A CN 201610739634A CN 106327088 B CN106327088 B CN 106327088B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
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Abstract
The invention provides a distribution line loadThe load rate calculation method can reflect the load condition of the distribution line more accurately and provide accurate and reliable data support for operation analysis, planning and feeder automation action strategy work of the distribution network, and the method comprises the following steps: inquiring the type of each segmented conductor of the line; determining the current limiting value I of each section of the linepiTaking the minimum value of rated current-carrying capacity in various types of the segmented lead as the current limiting value; inquiring the maximum current value I of each section switch of the line in a certain periodmaxicalculating the load rate of each section of the line, usingObtaining the line load rate R ═ min (R)i) (ii) a With R ═ min (R)i) K% is used as a threshold value, the value range of K is 80-100, the method is used as an important basis of a feeder automation action strategy, overload of a ring network circuit is avoided when a non-fault area is recovered, even overcurrent protection action is caused, and the power failure range is expanded.
Description
Technical Field
The invention relates to a distribution line load rate calculation method, and belongs to the field of distribution network operation analysis.
Background
In the conventional load rate of the distribution line, the minimum value of the current-carrying capacity of each section of conductor of the main line is used as a denominator, the maximum current in a certain period is used as a numerator, and the obtained percentage is used as the load rate of the line. The calculation method excessively emphasizes the neck part of the trunk line, when the neck part appears at the tail end of the line, the current of the load of the section of the wire is often small, the load level is low, the load condition of the line cannot be accurately reflected, and the power grid enterprise is misled to carry out the work of power distribution network operation analysis, planning and compiling and the like. When the feeder automation action strategy restores the power supply of the non-fault area, the overload of the looped network line is caused, even the overcurrent protection action is caused, and the power failure range is enlarged.
In recent years, all levels of power grid enterprises strive to improve the high-quality service level, the investment and the strength of power distribution network construction and transformation are continuously increased, the load rate of a power distribution line is used as the important content of power distribution network operation analysis, whether the calculation method can accurately reflect the load condition of the line or not is judged, and the accuracy of power distribution network operation analysis, planning and feeder automation action strategies is directly determined, so that the accuracy and the output rate of power distribution network construction and transformation investment are influenced.
Disclosure of Invention
The invention aims to provide a distribution line load rate calculation method, which aims to reflect the distribution line load condition more accurately, provide accurate and reliable data support for operation analysis, planning and feeder automation action strategy work of a distribution network, and improve the accuracy and output rate of construction and reconstruction investment of the distribution network.
The technical scheme adopted for achieving the purpose is as follows:
a distribution line load rate calculation method comprises the following steps:
1, inquiring the type of each segmented conductor of the line; determining the current limiting value I of each section of the linepitaking the minimum value of rated current-carrying capacity in various types of the segmented lead as the current limiting value;
2 inquiring the maximum current value I of each section switch of the circuit in a certain periodmaxiAccording to the operation analysis requirement, annual query is generally carried out, but the current value of the looped network in the operation period is generally not considered when the operation mode of the circuit when the maximum value occurs needs to be noticed;
3 calculating the load rate of each section of the line by adopting
4 ] obtaining the lineRoad load ratio Rmin＝min(Ri)。
5 where R is min (R)i) K% is used as a threshold value, the value range of K is 80-100, if the section before the fault of the non-fault area has load, the load rate of the opposite side line is smaller than the threshold value, the power supply of the non-fault area is recovered; if the load rate of the opposite side line exceeds the threshold value, the power supply of the non-failure area is not recovered or the power supply of the non-failure area is recovered in sections.
the invention has the advantages that: the distribution line load rate calculation method firstly determines the subsection calculation load rate, then takes the minimum value of each subsection as the thought of the line load rate so as to adapt to the current situation that the types of each subsection conducting wire of the distribution line are different, strives to more accurately reflect the distribution line load condition, and is taken as the important basis of the feeder automation action strategy, thereby avoiding overload of the looped network line and even overcurrent protection action when the non-fault area is recovered, and expanding the power failure range.
Drawings
FIG. 1 is a flow chart of one embodiment of the method of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the method of the present invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings.
The invention provides a method for calculating a load rate of a distribution line, which is a preferred embodiment, please refer to fig. 1, and the specific steps are as follows:
CH1, starting;
CH2, inquiring the type of each section wire of the line; the rule of line segmentation is the same as that of the line segmentation in the prior art, and a segmentation switch is used as a node of the line segmentation;
CH3, determining the restriction value I of each section of the linepitaking the minimum value of rated current-carrying capacity in various types of the segmented lead as the current limiting value;
referring to fig. 2, the minimum value of the rated current-carrying capacity in the wire models of the section i, the section ii, the section iii, the section iv and the section v of the line 1 is taken as the current limiting value of each section;
CH4, inquiring the maximum current value I of each section switch of the line in a certain period by means of distribution automation and the likemaxiaccording to the operation analysis requirement, annual query is generally carried out, but the current value of the looped network in the operation period is generally not considered when the operation mode of the circuit when the maximum value occurs needs to be noticed;
referring to fig. 2, the previous annual maximum current values of the outlet switch 211, the sectionalizer 0, the sectionalizer 1, the sectionalizer 2, and the sectionalizer 3 of the line 1 are taken as I of each sectionmaxi；
CH5, calculating load rate of each segment of the line, and adopting
Referring to FIG. 2, the load factor of each segment of the line 1 is calculated, and the load factor of the segment I isthe second section, the third section, the fourth section and the fifth section are analogized in turn to obtain R2、R3、R4、R5；
CH6, obtaining the line load rate Rmin＝min(Ri)。
referring to FIG. 2, the load factor, R, of line 1 is calculatedmin＝min(R1，R2，R3，R4，R5)。
with R ═ min (R)i) 100% is used as a threshold value, if the section before the fault of the non-fault area has load, and the load rate of the opposite side line is smaller than the threshold value, the power supply of the non-fault area is recovered; if the load rate of the opposite side line exceeds the threshold value, the power supply of the non-failure area is not recovered or the power supply of the non-failure area is recovered in sections.
Claims (2)
1. A distribution line load rate calculation method is characterized by comprising the following steps: the method comprises the following steps:
1, inquiring the type of each segmented conductor of the line; determining the current limiting value I of each section of the linepiTaking rated current carrying in various conductor models of the sectionThe minimum value of the quantity as its restriction value;
2 inquiring the maximum current value I of each section switch of the circuit in a certain periodmaxi；
3 calculating the load rate of each section of the line by adopting
4 ] obtaining the line load rate Rmin＝min(Ri)；
5 where R is min (R)i) K% is used as a threshold value, the value range of K is 80-100, if the section before the fault of the non-fault area has load, the load rate of the opposite side line is smaller than the threshold value, the power supply of the non-fault area is recovered; if the load rate of the opposite side line exceeds the threshold value, the power supply of the non-failure area is not recovered or the power supply of the non-failure area is recovered in sections.
2. The distribution line load factor calculation method of claim 1, wherein: step 2, according to the operation analysis requirement, the maximum current value I of each section switch of the circuit in a certain period is inquired in a year modemaxi。
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| CN201610739634.8A CN106327088B (en) | 2016-08-27 | 2016-08-27 | Distribution line load rate calculation method |
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| CN201610739634.8A CN106327088B (en) | 2016-08-27 | 2016-08-27 | Distribution line load rate calculation method |
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| CN116154772B (en) * | 2023-04-23 | 2023-07-04 | 广东电网有限责任公司佛山供电局 | Distribution network line current-carrying capacity rationality automatic analysis method, device and equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280810A (en) * | 2013-04-15 | 2013-09-04 | 江苏省电力公司南京供电公司 | Optimized dispatching method for improving load rate of power distribution network |
| CN103543360A (en) * | 2013-10-29 | 2014-01-29 | 珠海许继芝电网自动化有限公司 | Method and system for monitoring repeated overload of power distribution network lines |
| CN104484834A (en) * | 2014-12-03 | 2015-04-01 | 国家电网公司 | Determination method for minimum current carrying value of power distribution line |
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| US5963457A (en) * | 1994-03-18 | 1999-10-05 | Hitachi, Ltd. | Electrical power distribution monitoring system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280810A (en) * | 2013-04-15 | 2013-09-04 | 江苏省电力公司南京供电公司 | Optimized dispatching method for improving load rate of power distribution network |
| CN103543360A (en) * | 2013-10-29 | 2014-01-29 | 珠海许继芝电网自动化有限公司 | Method and system for monitoring repeated overload of power distribution network lines |
| CN104484834A (en) * | 2014-12-03 | 2015-04-01 | 国家电网公司 | Determination method for minimum current carrying value of power distribution line |
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