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Harmonic contribution calculating method applicable to background harmonic voltage change

A technology of background harmonics and harmonic voltages, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of large estimation error, not considering the influence of harmonic responsibility calculation accuracy, etc., to improve the accuracy degree, overcoming the impact, reducing the effect of the impact

Active Publication Date: 2015-04-08
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

The existing calculation methods for harmonic responsibilities of multiple harmonic sources all assume that the harmonic voltage and harmonic impedance of the background (generated by the system) are constant, and do not take into account the influence of background harmonic voltage changes on the calculation accuracy of harmonic responsibilities. Impact
However, in actual situations, the background harmonic voltage often changes, and the change of the background harmonic voltage leads to a large estimation error of the existing method

Method used

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  • Harmonic contribution calculating method applicable to background harmonic voltage change
  • Harmonic contribution calculating method applicable to background harmonic voltage change
  • Harmonic contribution calculating method applicable to background harmonic voltage change

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Embodiment

[0034] figure 1 It is shown that a specific implementation of the present invention is a method for calculating harmonic responsibility applicable to background harmonic voltage changes, the steps of which are:

[0035] A. Data collection

[0036] Sampling to obtain the harmonic voltage v(n) of the bus at time n, that is, the common connection point, and the harmonic current I on the feeder k k (n), the harmonic voltage v(n) at time n=1~N is composed of bus harmonic voltage vector V, V=[v(1),v(2),...v(n)...v(N) ] T ; At the same time, the harmonic current i on the feeder k at n=1~N time k (n) The harmonic current vector I composing the feeder kk , I k =[i k (1), i k (2),... i k (n)...i k (N)] T , and then the harmonic current vector I on all feeders k Form feeder harmonic current matrix I, I=[I 1 , I 2 ,…I k ..., I K ], k is the serial number of the feeder, K is the number of the feeder, and T is the transposition of the matrix;

[0037] B. Data preprocessing an...

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Abstract

The invention discloses a harmonic contribution calculating method applicable to a background harmonic voltage change. The harmonic contribution calculating method comprises the steps that under the condition of a plurality of harmonic sources, the system harmonic impedance is estimated through a leading fluctuation quantity method; clustering processing is conducted on background harmonic voltage data through a mean shift algorithm according to the change conditions of the background harmonic voltage, and the background harmonic voltage data are divided into different data segments according to background harmonic voltage values; harmonic contributions of the data segments are calculated through a partial least square method, weighted summation is conducted, and therefore the harmonic contribution in a focused time period can be obtained. The harmonic contribution calculating method improves accuracy of harmonic contribution calculation, and can effectively eliminate the influence of the background harmonic voltage change on harmonic contribution calculation.

Description

technical field [0001] The invention relates to a harmonic responsibility calculation method, which belongs to the technical field of power electronics. Background technique [0002] With the rapid development of power electronics technology, the power load is becoming more and more complicated and diversified. A large number of loads with nonlinear characteristics will inject too many high-order harmonics into the power system, which will cause harm and impact on the safety and economic operation of the power system including users. The increase of harmonic content will cause electrical equipment to overheat, generate vibration and noise, cause insulation aging, shorten the service life, or even fail or burn out. Outside the system, harmonics will cause serious interference to communication equipment and electronic equipment. Therefore, effectively controlling the harmonic level in the power grid is an urgent problem to be solved, and accurately and reasonably dividing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G06F19/00
Inventor 何正友符玲王瑜臧天磊杨源
Owner SOUTHWEST JIAOTONG UNIV
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