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Intelligent method for measuring electric energy considering interharmonics in microgrid

An electric energy metering and microgrid technology, applied in the measurement of electrical variables, neural learning methods, calculations, etc., can solve the problems of inaccurate metering, difficult to meet the multi-energy bidirectional metering and rapid control decision-making of microgrids, etc.

Pending Publication Date: 2019-02-19
STATE GRID GASU ELECTRIC POWER RES INST +3
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Problems solved by technology

[0002] The microgrid contains a variety of distributed power sources, active loads and a large number of electric vehicle charging stations. The inaccurate measurement of traditional metering methods has become increasingly prominent due to the access of loads, making it difficult to meet the needs of multi-energy bidirectional metering and rapid control decision-making in microgrids

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  • Intelligent method for measuring electric energy considering interharmonics in microgrid
  • Intelligent method for measuring electric energy considering interharmonics in microgrid
  • Intelligent method for measuring electric energy considering interharmonics in microgrid

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Embodiment Construction

[0024] The invention discloses an intelligent electric energy metering method considering interharmonics in a microgrid, comprising the following steps:

[0025] Step 1: In a three-phase asymmetrical power system, the voltage and current alternating quantities consist of fundamental, harmonic and interharmonic content. According to the definition of active power and the orthogonality of trigonometric functions, it can be seen that the voltage and current of the same frequency can constitute active power, but the voltage and current of different frequencies cannot constitute active power. ω is the fundamental angular frequency; U k , I k Respectively k times voltage, effective value of current frequency component; α k , β k are the phase angles of k times voltage and current frequency content respectively, and the active energy value generated by the voltage and current alternating current is:

[0026]

[0027] Step 2: Hilbert-Huang Transform (HHT) is a time-frequency an...

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Abstract

The harmonic and interharmonic power directions are difficult to determine and thus a problem that the electric energy measurement is not accurate when measuring electric energy due to a large numberof non-linear loads in a microgrid. The invention relates to an intelligent method for measuring electric energy considering interharmonics in the microgrid. The method comprises the following steps of: first, decomposing the acquired voltage and current signals to obtain the amplitude, phase, frequency and other information of each signal through an empirical mode, and establishing real-time spectrums of the signals by Hilbert-Huang Transform; second, putting the decomposed signals into a deep belief network to obtain different signal groups divided according to frequencies by pre-training and fine-tuning; and finally, obtaining an active power value of an interharmonic wave according to an electric energy calculation method. The method can conveniently and quickly realize the intelligentmeasurement of the electric energy considering interharmonics.

Description

technical field [0001] The invention relates to an intelligent electric energy metering method considering interharmonics, in particular to realize the intelligent electric energy metering taking interharmonics into account by adopting Hilbert-Huang transform and deep belief network analysis method. Background technique [0002] The microgrid contains a variety of distributed power sources, active loads and a large number of electric vehicle charging stations. The inaccurate measurement of traditional metering methods has become increasingly prominent due to the access of loads, making it difficult to meet the needs of multi-energy bidirectional metering and rapid control decision-making in microgrids. Therefore, it is necessary to study the nonlinear load meter and interharmonic energy smart metering algorithm suitable for microgrids to improve the accuracy of electric energy metering. Contents of the invention [0003] The invention uses the Hilbert-Huang transformation...

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Application Information

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IPC IPC(8): G01R22/06G06K9/62G06N3/08G06N3/04
CPCG06N3/08G01R22/06G06N3/045G06F18/214
Inventor 高敬更王琨李鹏魏立兵张楠张勇红陈欣董智颖王磊侯琦乔立凤杨春光吕志强张大品丁颖杰王兴贵杨熹刘双艳李浒
Owner STATE GRID GASU ELECTRIC POWER RES INST
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