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A Calculation Method of Impact Load

A calculation method and impact load technology, applied in the field of electric energy measurement, can solve the problems of unjust and reasonable billing, large error fluctuations, etc.

Active Publication Date: 2020-10-20
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the current metering method of smart meters under dynamic and impact loads is delayed in power calculation, resulting in large error fluctuations and unjust and reasonable billing, the present invention provides a method for measuring impact loads, including:

Method used

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  • A Calculation Method of Impact Load
  • A Calculation Method of Impact Load
  • A Calculation Method of Impact Load

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing and embodiment, preferred embodiment of the present invention is described in further detail. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] The current smart meter generally adopts the method of counting the number of pulses to accumulate electric energy. When the pulse constant is determined, the electric energy of one pulse should also be fixed. There is no problem with the theoretical basis of calculating power, but the difference in measurement under dynamic and impact loads is mainly reflected in the different ways of accumulating a pulse of electricity, mainly by calculating the average power within a certain window time, and calculating the pulse interval through the average power . This method can make the electric energy error not easy to jump, and the precision is high. However, under dynamic and impact loads, due t...

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Abstract

The invention provides a calculation method of impact load, the steps of the method comprises: calculating instantaneous power point by point; calculating instantaneous electric quantity of a single pulse period based on the instantaneous power; performing IIR low-pass filtering for the instantaneous electric quantity of the single pulse period to obtain the stable electric quantity of the singlepulse period. The method comprises: directly accumulating instantaneous power in a pulse period, and sending a pulse when the accumulated value of the instantaneous power is greater than the electricquantity threshold of the single pulse period; calculating the instantaneous electric quantity of the single pulse period based on the instantaneous power; performing IIR low-pass filtering based on the instantaneous electric quantity of the single pulse period to obtain the stable electric quantity of the single pulse period, that is, the electric quantity consumed by the impact load in the single pulse period. The calculation method of impact load can accurately calculate the electric quantity consumed by the impact load when the nonlinear dynamic impact load is generated, so that the smartmeter can be billed reasonably and reasonably, and the national economic loss is reduced.

Description

technical field [0001] The invention relates to the field of electric energy measurement, in particular to a calculation method for impact load. Background technique [0002] With the rapid development of industry and the continuous innovation of technology, various new energy sources such as solar energy, wind energy, tidal energy and other grid-connected technologies have been promoted, and various nonlinear, impact and asymmetric loads have been put into use in large quantities, such as electrified rail transit , distributed power supply, silicon controlled rectifier, electric arc furnace, rolling mill, electric locomotive, etc. The load current of this kind of nonlinear dynamic impact load changes dynamically with time, and even fluctuates greatly in a short time, which may cause problems such as frequency deviation, voltage fluctuation, voltage flicker, voltage instability, harmonic distortion and DC injection. , It will cause great hidden dangers to the electrical per...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 熊德智陈向群胡军华刘小平杨茂涛
Owner STATE GRID HUNAN ELECTRIC POWER
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