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A Method for Harmonic Current Estimation of Distribution Network Based on Piecewise Constant Independent Component Analysis

An independent component analysis, harmonic current technology, applied in the field of power system, can solve problems such as limitation and low estimation accuracy

Active Publication Date: 2019-03-01
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the existing invention patent "He Zhengyou, Zang Tianlei, Yang Yuan, Sun Zhongmin. A harmonic source location method based on fast independent component analysis and mutual information, CN103412242A[P].2013." The harmonic current estimation method in the power grid parameters The estimation accuracy is low under changing working conditions, and its practical application is limited

Method used

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  • A Method for Harmonic Current Estimation of Distribution Network Based on Piecewise Constant Independent Component Analysis
  • A Method for Harmonic Current Estimation of Distribution Network Based on Piecewise Constant Independent Component Analysis
  • A Method for Harmonic Current Estimation of Distribution Network Based on Piecewise Constant Independent Component Analysis

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Embodiment

[0049] figure 2 A distribution network harmonic current segmentation situation of the present invention is shown, and the steps used for the estimation of the distribution network harmonic current segmentation constant are as follows:

[0050] A. Data collection

[0051] Collect the hth harmonic voltage data of all buses in the distribution network V=[V 1 ,V 2 ,...,V i ...,V N ] and prior harmonic injection current data where V i (1≤i≤N) is the harmonic voltage vector on the i-th bus, 1×L order; (1≤i≤N) is the prior harmonic injection current vector on the i-th bus, 1×L p order; L is the total number of sampling points, L p is the length of the harmonic voltage data segment (L p ≤L), N is the number of buses.

[0052] B. Segmental estimation of harmonic current

[0053] B1. Estimate the harmonic current by using the piecewise constant independent component analysis method:

[0054] B11. For the harmonic voltage data V, segment according to the sampling points, a...

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Abstract

The invention discloses a piecewise constant independent component analysis-based method for estimating a harmonic current of a power distribution network. The method comprises the steps of firstly building a piecewise constant model of harmonic current estimation, determining a harmonic current sequence by adopting a correlation coefficient matrix association method of overlapped sections, determining a harmonic current amplitude by utilizing an error minimization method of the overlapped sections, and lowering the need of prior harmonic current data; secondly giving a criterion of power network parameter change; and finally determining a data interval of the power network parameter change through a bisection method, and correcting a harmonic current estimation result during the power network parameter change to improve estimation precision during the power network parameter change. According to the method, harmonic current estimation errors during the power network parameter change can be reduced and the estimation process is free of power network parameter data; and the method is suitable for the harmonic current estimation under the condition that the parameters of the power distribution network are dynamically changed.

Description

technical field [0001] The invention relates to a distribution network harmonic current estimation method based on piecewise constant independent component analysis, which belongs to the field of power systems. Background technique [0002] In recent years, with the extensive application of power electronic equipment, the harmonic pollution of the power grid has intensified, seriously affecting the operation of the power grid. Therefore, in order to provide users with high-quality electric energy and ensure the safety and stability of the distribution network, it is necessary to control the harmonic pollution. The installation of filtering devices is an important means of harmonic control. The installation location and specifications need to be reasonably planned according to the harmonic injection current level; at the same time, the estimation of the harmonic current injection level also provides accurate and real-time harmonic status for the power distribution system. Da...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 臧天磊王艳
Owner SOUTHWEST JIAOTONG UNIV
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