High-precision electric power parameter software synchronous sampling method

Abstract

The invention discloses a high-precision electric power parameter software synchronous sampling method. A sampling period TsK is calculated for sampling according to a pre-sampling electric power signal period sequence {Ti}, i=1,2,...,M+K-1, a moving average algorithm and an exponential smoothing algorithm, so that software synchronous sampling is realized. On the premise of fixing sampling numbers of each signal period, the sampling period is adjusted according to periodic values obtained by multiple measurements to enable the sampling period to be adjusted in real time along with measured electric power signal period variation, electric power parameters obtained by measurement is approximate to true values to the maximum extent, and accordingly synchronous sampling precision is improved. Compared with hardware synchronous sampling, the high-precision electric power parameter software synchronous sampling method has the advantages of simple structure and lower cost; and compared with traditional software synchronous sampling methods, the high-precision electric power parameter software synchronous sampling method has the advantages of small calculation amount, timeliness is improved, and more evident measurement effects can be achieved with regard to electric power parameters slow in frequency variation.

Description

technical field [0001] The invention belongs to the technical field of power parameter measurement, and more specifically relates to a high-precision power parameter software synchronous sampling method. Background technique [0002] In today's society, power resources, as the most widely used energy source, have been widely used in various fields of production and life. The development level of electric power technology is one of the important indicators of a country's development level. With the development of science and technology and the acceleration of industrialization, people's requirements for power quality are also getting higher and higher. [0003] The measurement level of power parameters directly affects the evaluation of power quality. In the measurement of power parameters, the method of synchronous sampling is generally used to realize the calculation of a series of parameters such as harmonics. [0004] The basic model of synchronous sampling of power para...

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Problems solved by technology

However, if the power signal is severely disturbed and distorted, the phase-locked loop circuit cannot track the frequency of the power signal.

And the hardware circuit of the hardware synchronous sampling method is too complicated and the cost is high

[0006] The software synchronous sampling is relatively flexible compared to the hardware synchronous method, but it is difficult to eliminate the synchronous error of the digital method

There are many studies on this problem at home and abroad, and a series of methods such as special window function method, compensation algorithm, and correction algorithm have been proposed. However, these methods are very complicated to deal with, and generally increase the amount of calculation to a large extent, which greatly reduces real-time performance. , therefore, cannot be well applied in engineering practice

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