Improved electric automobile charging electric energy signal feature analyzing method

An electric vehicle, feature analysis technology, applied in the direction of measuring electricity, measuring electric variables, electric digital data processing, etc., to achieve the effects of avoiding layering errors, accurate type and positioning, and accurate analysis

Active Publication Date: 2018-06-22
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an improved electric vehicle charging power signal characteristic analysis method, which can make up for the defect that the existing FFT algorithm and Kalman filter algorithm cannot comprehensively analyze the characteristics of electric vehicle charging power signal

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  • Improved electric automobile charging electric energy signal feature analyzing method
  • Improved electric automobile charging electric energy signal feature analyzing method
  • Improved electric automobile charging electric energy signal feature analyzing method

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0039] to combine figure 1 Shown, method of the present invention mainly comprises the following steps:

[0040] Step 1: Collect electric vehicle charging voltage / current signal f(t);

[0041] Step 2: neural network method training the relevant parameters of wavelet transform;

[0042] The stratification parameter m will be calculated by the theoretical formula (1)(2) 0 , threshold parameter Ds 0 The initial value of is used as input, and a large amount of AC and DC charging data of electric vehicles are used for training, and the revised hierarchical parameter m and threshold parameter Ds are output.

[0043]

[0044]

[0045] Among them, fs is the sampling frequency; f 0is the grea...

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Abstract

The invention discloses an improved electric automobile charging electric energy signal feature analyzing method. The improved electric automobile charging electric energy signal feature analyzing method comprises the following steps: firstly, training relevant parameters of wavelet transform by using a neural network method so that the trained wavelet transform is more suitable for extracting electric automobile charging voltage instantaneous change signal features; secondly, monitoring a sudden rising (falling) point of a voltage/current signal in real time by using the neural network method, and recognizing signal features at the voltage/current sudden rising (falling) position by wavelet transform; and finally, after eliminating influence of abnormal signals such as unsteady wave and signal sudden rising (falling), judging signal features such as harmonic wave and inter-harmonic percentage, frequency deviation and three-phase balance degree by using a Kalman filtering algorithm. The recognition accuracy of electric automobile charging voltage/current instantaneous change signals and sudden rising (falling) signals can be improved further on the basis of traditional wavelet transform, ability of detection of harmonic percentage and three-phase voltage unbalance degree under the unsteady wave through a conventional Kalman filtering algorithm can be enhanced further, and therefore, the electric automobile charging electric energy signal features are comprehensively and reliably analyzed.

Description

technical field [0001] The invention relates to the analysis of electric vehicle charging power quality, in particular to an improved characteristic analysis method of electric vehicle charging power signal. technical background [0002] In recent years, as the global energy crisis has become more and more serious, the issue of alternative energy and energy sustainable development is imminent, and electric energy has become the first choice of many countries due to its clean and renewable energy advantages. At present, pure electric vehicles have begun to enter the market through industrialization, and the supporting electric vehicle chargers have also been mass-produced and constructed. [0003] The charger of the electric vehicle charging station is a new type of high-power non-linear equipment. Too intensive centralized charging may cause the instantaneous load of the charging station to be too large, causing the voltage / current signal to rise (drop) frequently during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14G01R31/00
CPCG01R31/00G06F17/148
Inventor 刘建田正其徐晴周超祝宇楠欧阳曾恺王立辉
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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