Harmonic instantaneous power calculating method utilizing incomplete S transform
A technology of instantaneous power and calculation method, applied in spectrum analysis/Fourier analysis, etc.
Active Publication Date: 2015-01-07
南京电科自动化有限公司
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[0006] The invention provides a harmonic power calculation method to solve the problems of accurate calculation of harmonic power and flow direction discrimination
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[0024] In order to solve the problem of accurate calculation of harmonic power and judgment of flow direction, the present invention provides a calculation method of harmonic instantaneous power. The preferred implementation examples of the present invention are described below in conjunction with the accompanying drawings. It should be noted that the preferred implementation examples are to further illustrate the present invention. invention, not to limit the scope of protection of the present invention.
[0025] like figure 1 It is a functional module and a calculation flowchart of the harmonic instantaneous power calculation method of the present invention, and the method includes the following specific implementation steps:
[0026] S1: Synchronous sampling of instantaneous voltage and current data is temporarily stored in the data buffer;
[0027] S2: If the length of the sampling data reaches 10 fundamental wave periods, read the data into the calculation area, the dat...
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The invention discloses a harmonic instantaneous power calculating method. The method comprises the following steps: firstly, intercepting 10 fundamental waves for instantaneous voltage data and instantaneous current data which are synchronously acquired and using the 10 fundamental waves as one calculating period, respectively carrying out FFT (Fast Fourier Transform) computing on the instantaneous voltage data and the instantaneous current data and extracting frequencies fn of the fundamental waves and harmonic waves from an FFT frequency spectrum of a voltage signal; next, aiming at fn of a voltage and a current, carry out incomplete S transform so as to respectively obtain complex matrices Tv and Ti; then on one hand, obtaining amplitude values of the Tv and Ti to respectively obtain amplitude value matrices MTv and Mti and on the other hand, carrying out conjugation on Ti to obtain Ti*, then carrying out array multiplication on corresponding lines of Tv and Ti* to obtain a complex matrix Tc and obtaining an instantaneous phase difference matrix fai of each harmonic voltage and current; finally, utilizing MTv, Mti and fai to respectively calculate instantaneous active powers and reactive powers of the fundamental waves and the harmonic waves and according to polarities of the instantaneous powers, judging whether the harmonic waves generate users or the harmonic waves consume the users. The harmonic instantaneous power calculating method provides reliable basis for harmonic metering, reasonable charging and duty allocation of harmonic pollution.
Description
technical field [0001] The invention relates to the field of harmonic power calculation and measurement, in particular to a method for calculating harmonic instantaneous power. Background technique [0002] With the continuous increase of nonlinear loads and the widespread use of variable frequency drive systems, a large number of harmonics are injected into the grid, which has an adverse effect on the service life of power equipment and the stable operation of power quality sensitive equipment; in addition, under the traditional metering method, the grid Harmonics cause non-harmonic users to suffer from poor power quality, but also to bear additional electricity costs caused by unnecessary harmonic losses, while users who generate harmonics are less included in part of the electricity, which not only cannot divide the pollution of power quality Responsibility, energy metering and billing also lacks rationality. Therefore, it is necessary to measure harmonics, identify the ...
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Inventor 易吉良欧阳琴李军军贺正芸欧阳敏
Owner 南京电科自动化有限公司