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Improved electric vehicle charging non-linear load harmonic wave electric energy metering method

A non-linear load, electric vehicle technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve problems such as insufficient Fourier transform ability, and achieve the effect of solving insufficient ability and improving accuracy

Active Publication Date: 2017-05-10
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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Problems solved by technology

[0007] Purpose of the invention: The present invention provides an improved electric vehicle charging nonlinear load harmonic electric energy metering method, which can separate the steady-state and unsteady-state harmonics generated during the charging operation of the electric vehicle nonlinear load, through the expansion and translation of the time scale Etc. calculations, multi-scale detailed analysis of power nonlinear load harmonic signals, solve the problem of insufficient capability of Fourier transform in nonlinear load power measurement, and improve the accuracy of electric vehicle charging electric energy measurement

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Embodiment Construction

[0040] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0041] Based on the standard Fourier transform algorithm, the invention discloses a new method for realizing the non-linear load harmonic electric energy measurement of the electric vehicle.

[0042] The non-linearity of the electric vehicle charging load, the power supply to the load is a sinusoidal voltage, and the current is a non-sinusoidal waveform composed of the fundamental wave and harmonics that are integer multiples of the fundamental frequency, resulting in an increase in harmonic components in the power supply , the supply voltage is distorted. figure 1 It is an equivalent circuit model of a nonlinear load with electric vehicle charging, and this model is used to illustrate the influence of harmonic power on the energy measurement results in the presence of harmonics.

[0043] figure 1Among them, the power grid u(t) can be regarded a...

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Abstract

The invention discloses an improved electric vehicle charging non-linear load harmonic wave electric energy metering method. On the basis of the Fourier transform algorithm, the method is performed as follows: using a time-scale analysis method to construct a data analysis algorithm which is consistent with the charging characteristic distribution of an electric vehicle; checking the localized characteristics of a non-stable signal; adjusting the widths of the time window and the frequency window to realize the variable time-frequency resolution; optimizing the electric vehicle non-linear load harmonic wave electric energy metering method; identifying and separating the steady-state harmonic waves and non-steady-state harmonic waves; conducting time-frequency decomposition, stratification and reconstruction to the signal; and achieving the purpose of accurate metering in the entire process. The method of the invention can separate the steady-state and non-steady-state harmonic waves generated by the nonlinear load during the charging operation of the electric vehicle, and performs the multi-scale refinement analysis of the electric power harmonic signal by the telescopic and translational operation of the time scale, which solves the insufficiency problem in Fourier transform in electric vehicle charging non-linear load harmonic wave electric energy metering, therefore, raising the accuracy of electric vehicle charging energy metering.

Description

technical field [0001] The invention relates to an electric vehicle charging electric energy measurement system, in particular to an improved electric vehicle charging nonlinear load harmonic electric energy measurement method. Background technique [0002] At present, electric vehicles have the characteristics of energy saving and environmental protection, and are vigorously promoted and applied in countries all over the world. Electric vehicles are mainly powered by two charging modes: conventional charging and fast charging, while the battery charging of electric vehicles is a nonlinear load, and the distribution of charging loads has great randomness in time and space. When an electric vehicle is fast-charged with a large current, a large current of 150-600A will be formed, and excessively intensive centralized charging may cause the instantaneous load of the charging station to be too large. Electric vehicle battery charging is a capacitive load, the load power factor ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 田正其徐晴刘建祝宇楠周超龚丹穆小星王立辉
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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