Electric car charging station harmonic wave detection method in microgrid

An electric vehicle and harmonic detection technology, which is applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of non-linear and non-stationary signals that cannot be analyzed, and achieves a simple and easy harmonic detection method and suppresses spectrum. Aliasing issues, adaptable effects

Active Publication Date: 2012-12-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] In view of the shortcomings of the existing time-frequency analysis method mentioned in the above background technology that cannot analyze n

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  • Electric car charging station harmonic wave detection method in microgrid
  • Electric car charging station harmonic wave detection method in microgrid
  • Electric car charging station harmonic wave detection method in microgrid

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detailed description:

[0098] In order to fully illustrate the effectiveness of the harmonic detection method proposed by the present invention in the analysis of harmonic problems, the following harmonic signals are analyzed separately.

[0099] Example 1: Where A 1 = 2A, A 2 = 1.5A, A 3 =1.5A; f 1 = 4Hz, f 2 = 2Hz, f 3 = 0.5 Hz. The signal is a short-time harmonic current sequence, the sampling frequency is 300, and the number of sampling points is 301. The waveform diagram is as follows image 3 Shown.

[0100] Perform cubic spline interpolation on the short-time harmonic signal to obtain the envelope of the signal as Figure 4 Shown. It can be seen from the figure that there are only 3 maximum points and 4 minimum points in the original signal. Since it is impossible to determine whether the endpoint is an extreme point, the trend of the signal envelope at the endpoint cannot be known. The envelope cannot contain all the data. The upper and lower envelopes deviate from the o...

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Abstract

The invention discloses an electric car charging station harmonic wave detection method in a microgrid in the electric engineering microgrid technical field. First, harmonic current in the microgrid are pretreated and is broken down into narrow band frequency signal families S1. Next, continuation treatment is carried out for the narrow band frequency signal families S1 through adoption of a self-adaption step-be-step continuation method to obtain frequency signal families S. Further, empirical mode decomposition is carried out for the frequency signal families S to obtain natural mode components. Hibert conversion is carried out for the natural mode components, and finally instantaneous frequency signals and instantaneous amplitude signals of the components are obtained. The electric car charging station harmonic wave detection method not only is suitable for analyzing nonlinear and nonstationary signals in power quality of the microgrid, but also can better reflect frequency characteristics and amplitude characteristics of the signals by analyzing linear and stationary signals in the power quality of the microgrid than other time-frequency analysis methods, and has more specific physical significance.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering microgrids, in particular to a harmonic detection method for electric vehicle charging stations in the microgrid. Background technique [0002] With the depletion of oil resources and people's increasing attention to urban air pollution, electric vehicles have begun to be favored all over the world, and governments and industries in various countries are increasing their efforts to support the development of electric vehicles. Electric vehicles use electricity instead of oil, and the advantages of being able to achieve zero emissions make them an important means to solve energy and environmental problems. my country's electric vehicles started late, but developed rapidly. In order to meet the charging demand of electric vehicles, China is vigorously promoting the construction of electric vehicle charging stations. In April 2010, relevant state departments reviewed and passed the "...

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Application Information

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IPC IPC(8): G01R23/16G01R19/00
Inventor 李鹏李婉娉刘承佳张双乐肖湘宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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