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Novel harmonic emission level assessment method

A technology of emission level and harmonics, applied in the field of power system, can solve the problems of affecting the emission level of harmonics, being easily affected by singular values, erroneous estimation results, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2013-10-09
CHONGQING UNIV +1
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Problems solved by technology

In the linear regression method, the partial least squares method can perform regression modeling under the condition that the independent variables are seriously correlated, and the estimation accuracy is high, but it is easily affected by singular values, which leads to errors in the estimation results and ultimately affects the harmonic emission level evaluation of

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] refer to figure 1 , a new harmonic emission level evaluation method, by analyzing the system and user harmonic equivalent circuits at the point of common connection (PCC), the relationship between the system and user harmonic impedance and the voltage and current of the common connection point is obtained, Perform certain mathematical operations on the voltage and current signals collected at the PCC to extract the h-order harmonic voltage and current signals, and perform partial least squares regression modeling on the basis of data envelope analysis of the signals to obtain Estimation results of harmonic impedance, and finally use the regression results to evaluate user harmonic emission levels, the user harmonic impedance and its relationship with the voltage and current of the public connection point can be obtained...

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Abstract

The invention discloses a novel harmonic emission level assessment method. Harmonic equivalent circuits of a system and a user at a point of common coupling (PCC) are analyzed to obtain a relational expression between the harmonic impedance of the system and the user and the voltage and current at the PCC; a certain mathematical operation is conducted on voltage signals and current signals, wherein the voltage signals and the current signals are collected at the PCC; h subharmonic voltage signals and current signals are extracted; on the basis of data envelopment analysis of the signals, partial least square regression molding is conducted to obtain the estimated result of the harmonic impedance; lastly, the regression result is utilized for assessing the harmonic emission level of the user. According to the novel harmonic emission level assessment method, the data envelopment analysis is adopted for optimizing harmonic voltage and current values obtained through measurement at the PCC, invalid data caused by system operation fluctuation or a measuring instrument are eliminated, the defect that partial least square regression obtains a wrong model according to wrong data is overcome, the accuracy of the estimated result is greatly improved, and a basis is provided for duty allocation between the system and the user with respect to the power quality contamination status.

Description

technical field [0001] The invention belongs to the technical field of power systems and relates to a new method for evaluating harmonic emission levels. Background technique [0002] With the rapid development of power systems and the widespread use of various nonlinear loads, harmonic problems are becoming more and more serious. In order to ensure the quality of power supply and provide reasonable rewards and punishments for the impact of user access to the system, it is necessary to accurately divide the responsibilities of both parties in the power system for power quality pollution caused by public connection points. Therefore, determining the harmonic emission level of the system and the user (the voltage drop caused by the harmonic current at the common connection point) becomes the key to the division of responsibilities between the two parties. [0003] Currently, there are two types of interventional and non-interventional assessments of harmonic emission levels. ...

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Application Information

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IPC IPC(8): G01R23/16G01R19/00
Inventor 陈民铀李湘吕志盛李俊杰刘玲
Owner CHONGQING UNIV
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