Inter-harmonic detection method and system
A harmonic detection and harmonic technology, applied in the field of inter-harmonic detection methods and systems, can solve the problems of main lobe interference, low accuracy, difficult real-time detection, etc., achieve accurate separation detection, improve accuracy, and calculate precision. high effect
Pending Publication Date: 2019-04-02
JIANGSU ELECTRIC POWER CO +1
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[0002] With the access of distributed power sources and the development of smart grids, the content of inter-harmonics in the power system tends to increase. Inter-harmonics are a kind of power quality disturbance that cannot be ignored, and inter-harmonic components can be accurately detected. , is the first step to effectively analyze, compensate and suppress it, and is also the precondition for controlling the increasingly serious harmonic pollution of the power grid, improving power quality, and ensuring the safe, stable, and economical operation of the power system. However, due to the nonlinearity of inter-harmonic , randomness and non-stationary characteristics, it has certain difficulties in the real-time detection process
[0003] At present, the FFT (Fast Fourier Transform, Fast Fourier Transform) algorithm is mainly used to detect interharmonics, but when there are interharmonics close to the harmonic frequency in the signal, the analysis results obtained by this method usually have a main lobe The problem of interference leads to low calculation accuracy
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[0039] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the present invention, some specific details are described in detail, and in order to avoid obscuring the essence of the present invention, known methods, procedures, procedures, and components are not described in detail.
[0040] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0041] Unless the context clearly requires, throughout the specification and claims, "comprises", "comprises" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive meaning; that is, "including but not limited to" meaning.
[0042] In the description of the present invention, it should be understood that the terms "first", "second" and so on are used for descriptive purp...
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The invention discloses an inter-harmonic detection method and system. The inter-harmonic detection method comprises: S1, performing quasi-synchronization processing on a sampling sequence of a powersystem to obtain a quasi-synchronous sampling sequence; S2, processing the quasi-synchronization sampling sequence to realize separation of harmonic components from inter-harmonic components; and S3,on the basis of a matrix beam algorithm, carrying out parameter calculation on the inter-harmonic components obtained by separation. Therefore, the accuracy of detection of the inter-harmonic parameters is improved.
Description
technical field [0001] The invention relates to the technical field of electric power detection, in particular to an interharmonic detection method and system. Background technique [0002] With the access of distributed power sources and the development of smart grids, the content of inter-harmonics in the power system tends to increase. Inter-harmonics are a kind of power quality disturbance that cannot be ignored, and inter-harmonic components can be accurately detected. , is the first step to effectively analyze, compensate and suppress it, and is also the precondition for controlling the increasingly serious harmonic pollution of the power grid, improving power quality, and ensuring the safe, stable, and economical operation of the power system. However, due to the nonlinearity of inter-harmonic , randomness and non-stationary characteristics, it has certain difficulties in the real-time detection process. [0003] At present, the FFT (Fast Fourier Transform, Fast Four...
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CPCG01R23/165
Inventor 许建明马振国徐懿刘晓康许霖苏佳华贾霖
Owner JIANGSU ELECTRIC POWER CO