Statistical evaluation method for power factor of distribution network circuit

Abstract

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.

Description

technical field [0001] The invention relates to a power factor statistical assessment method for power grid lines. Background technique [0002] In the prior art, it is known that in the operation of the power grid, reactive power and power factor reflect the degree of effective utilization of the apparent power output by the power supply, and we hope that the larger the power factor, the better. In this way, the reactive power in the circuit can be reduced to a minimum, and most of the apparent power will be used to supply active power, thereby increasing the power of electric energy transmission. [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 load. Therefore, in order to improve the power factor of the power ...

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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 load. Therefore, in order to improve the power factor of the power system and the enterprise, the transformer should not be operated at no-load or in a low-load operation state for a long time; (3) the power supply voltage will exceed the specified range. Great influence on reactive power and power factor, etc.