Statistical evaluation method for power factor of distribution network circuit

A technology of line power and power factor, applied in electrical digital data processing, reactive power adjustment/elimination/compensation, calculation, etc., can solve the problems of reactive power power factor influence, transformer should not run without load, etc.

Inactive Publication Date: 2012-06-27
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AI-Extracted Technical Summary

Problems solved by technology

[0003] The main factors affecting reactive power and power factor include: (1) a large number of inductive devices, such as asynchronous motors, etc.; (2) the reactive power consumed by transformers is generally about 10%-15% of its rated capacity, and its The no-load reactive power is about 1/3 of that at full...
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The invention provides the technical scheme of a statistical evaluation method for a power factor of a distribution network circuit. The statistical evaluation method in the scheme includes a plurality of steps: sequentially summing up a plurality of time periods; reading active power, reactive power, voltage information and current information of a circuit marked true in a database of the time period; computing the power factor of the circuit according to a formula; comparing the power factor with top and bottom evaluation limitations of set power factor; judging whether the power factor is qualified or not; and storing the power factor and the information about whether the power factor is qualified or not. By the aid of the method in the scheme, the power factor can be timely and reliably obtained, reliability of data is ensured, safe, high-quality and reliable operation of a distribution network is ensured more effectively, and great indirect economic and social benefits are generated.

Application Domain

Reactive power adjustment/elimination/compensationSpecial data processing applications +1

Technology Topic

Power gridInformation storage +3


  • Experimental program(1)

Example Embodiment

[0014] In order to clearly illustrate the technical characteristics of this solution, the following describes this solution through a specific implementation and in conjunction with the accompanying drawings.
[0015] It can be seen from the accompanying drawings that a method for statistical assessment of power factor of grid lines in this solution is characterized by including the following steps:
[0016] a, divide a certain route into multiple time periods
[0017] b. Determine a certain period of time for statistical analysis,
[0018] c. Read the active power, reactive power and voltage information and current information of the line marked as true in the database of the time period,
[0019] d, according to the formula Calculate the power factor of this line, where Q is reactive power, P is active power,
[0020] e. Compare the upper and lower limits of the set power factor assessment with the calculated power factor to judge whether it is qualified. At the same time, judge whether the current and voltage information of the line is qualified according to the upper and lower limits of the set voltage and current;
[0021] f. Store the obtained power factor and eligibility information in the database;
[0022] g. Perform statistical analysis on another time period, repeat the above step a, until the statistical analysis of all time periods is completed.
[0023] The present invention is not limited to the above-mentioned specific embodiments, and changes, modifications, additions or substitutions made by persons of ordinary skill in the art within the essential scope of the present invention should also fall within the protection scope of the present invention.


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Description & Claims & Application Information

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