Electric energy quality monitoring system for high-voltage charging pile

Abstract

The invention discloses an electric energy quality monitoring system for a high-voltage charging pile. The electric energy quality monitoring system includes an electric energy quality disturbance signal collection module, a denoising module, a characteristic extraction module, an electric energy quality disturbance type identification module, and an electric energy quality evaluation module, wherein the electric energy quality disturbance signal collection module is used for implementing collection of an electric energy quality disturbance signal in a target segment; the denoising module performs denoising processing on the electric energy quality disturbance signal based on a generalized morphological filter of an adaptive LMS algorithm of a mathematical morphological structure; the characteristic extraction module is used for extracting an energy distribution at different frequency bands of the electric energy quality disturbance signal and a fractal dimension of the electric energyquality disturbance signal; the electric energy quality disturbance type identification module implements evaluation of a quality disturbance type based on an online training support vector machine;and the electric energy evaluation module is used for completing a statistic of all present electric energy quality disturbance type parameters, and outputting a corresponding electric energy qualityevaluation result based on a statistical result. The electric energy quality monitoring system provided by the invention may implement effective monitoring on electric energy quality of the high-voltage charging pile, and may implement automatic optimized control on the electric energy quality of the high-voltage charging pile.

Description

technical field [0001] The invention relates to the field of power monitoring, in particular to the power quality of high-voltage charging piles. Background technique [0002] With the large-scale access of electric vehicles to the DC distribution network, it may cause voltage flashover, voltage deviation, voltage sag and swell in the DC distribution network, and even cause system collapse in severe cases. As a result, equipment failures such as line damage, capacitor burnout, DC circuit breaker or relay malfunction, and load burnout. In addition, the power quality pollution caused by the large-scale connection of electric vehicles to the DC distribution network will also affect the normal operation of the DC distribution network, surrounding electric vehicle batteries and other loads, and will affect the power quality of the electric vehicle batteries, resulting in The service life of the battery is severely reduced. However, the current power quality monitoring system st...

AI Technical Summary

Problems solved by technology

[0002] With the large-scale access of electric vehicles to the DC distribution network, it may cause voltage flashover, voltage deviation, voltage sag and sudden rise of the DC distribution network, and even cause system collapse in severe cases.

As a result, equipment failures such as line damage, capacitor burnout, DC circuit breaker or relay malfunction, and load burnout

In addition, the power quality pollution caused by the large-scale connection of electric vehicles to the DC distribution network will also affect the normal operation of the DC distribution network, surrounding electric vehicle batteries and other loads, and will affect the power quality of the electric vehicle batteries, resulting in The service life of the battery is severely reduced

However, the current power quality monitoring system still has the problems of single target, low accuracy of monitoring results, low degree of automation of governance, and manual adjustment and governance in most cases.

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