A Calculation Method of Distribution Line Load Rate
A calculation method and technology of power distribution lines, applied in calculation, data processing applications, instruments, etc., can solve problems such as low load level, inability to accurately reflect line load conditions, etc., and achieve the effect of expanding the scope of power outages
Active Publication Date: 2019-12-13
PENGLAI POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO
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Problems solved by technology
This calculation method overemphasizes the "stuck neck" part of the trunk line. When the "stuck neck" part appears at the end of the line, the current load of this section of wire is often small, and its load level is low, which cannot accurately reflect the load of the line. situation, it will mislead the power grid enterprises to carry out distribution network operation analysis, planning preparation and other work
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[0015] In order to facilitate understanding of the present invention, the following will be described in conjunction with the accompanying drawings.
[0016] The present invention proposes a method for calculating the load rate of distribution lines. As a preferred implementation, please refer to figure 1 ,Specific steps are as follows:
[0017] CH1, start;
[0018] CH2, inquire about the wire model of each segment of the line; the rules of line segmentation are the same as those in the prior art, and the segment switch is used as the node of the line segment;
[0019] CH3, determine the current limit value I of each segment of the line pi , take the minimum value of the rated current-carrying capacity among the various types of conductors in this section as its current-limiting value;
[0020] control figure 2 , respectively take the minimum value of the rated current-carrying capacity of the wire models of Section I, Section II, Section III, Section IV, and Section V of...
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The invention provides a distribution line load rate calculation method, which reflects the distribution line load condition more accurately and provides an accurate and reliable data support for distribution line operation analysis, planning and automatic line-feeding action strategy work. The method comprises the steps of: inquiring the conductor type of each section of a line; determining the current limiting value Ipi of each section of the line, and selecting a minimum rated current carrying capacity among the conductor types of the sections as a current limiting value of the line; inquiring the maximum current value Imaxi of each section switch of the line within a certain period of time, calculating the load rate of each section of the line, and obtaining a line load rate R=min(Ri) by adopting Ri=Imaxi / Ipi; wherein R=min(Ri)*K% is used as a threshold, and K is 80-100. The method provides an important basis for automatic line-feeding action strategies, avoids overload of a looped network line when a non-fault area is recovered, even realizes over-current protection, and enlarges the power-off range.
Description
technical field [0001] The invention relates to a method for calculating the load rate of a distribution line, which belongs to the field of distribution network operation analysis. Background technique [0002] In the past, the load rate of distribution lines used the minimum value of the current carrying capacity of each section of the main line as the denominator, and the maximum current in a certain period of time as the numerator, and the obtained percentage was used as the load rate of the line. This calculation method overemphasizes the "stuck neck" part of the trunk line. When the "stuck neck" part appears at the end of the line, the current load of this section of wire is often small, and its load level is low, which cannot accurately reflect the load of the line. In this case, it will mislead the power grid enterprises to carry out distribution network operation analysis, planning and other work. When the automatic action strategy of the feeder restores the power ...
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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q50/06
Inventor 宋大伟李树臣王雪奇颜京忠尹超孙剑波王磊仲惟师郭春晓葛祖郁马世波闫大周张远铭张宝国汤胜波姚军传王军张道军宋善文翟端勇汤铁军罗守环丛宽堂栾丽明聂晶王朝阳刘春江王志军王克欣史春燕王畅王同耀张刚吴新鹏张建利万海朝王岩
Owner PENGLAI POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO