A Detection Method of Harmonics and Interharmonics
A harmonic detection and harmonic technology, applied in the field of harmonic and inter-harmonic detection, can solve the problem of low detection accuracy of harmonic and inter-harmonic, and achieve the goal of improving accuracy, identification accuracy and search efficiency Effect
Inactive Publication Date: 2020-09-18
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a detection method for harmonics and inter-harmonics, aiming at solving the problem of low detection accuracy of harmonics and inter-harmonics
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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0049] To achieve the above purpose, the present invention provides a detection method for harmonics and interharmonics.
[0050] Take the voltage signal as an example, such as figure 1 Shown is a flow chart of a harmonic and inter-harmonic detection method provided by the present invention.
[0051] Specifically, a harmonic and inter-harmonic detection method provided by the present invention includes the following steps:
[0052] S1. Sampling the input original voltage signal to obtain a discrete signal sequence, with f s The sampling frequency of the signal is sampled, and the time interval i...
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The present invention discloses a harmonic and interharmonic detection method. The method comprises: S1, sampling an input original signal to obtain a discrete signal sequence; S2, constructing a harmonic and interharmonic model; S3, performing spectrum estimation on the discrete signal sequence to obtain the fundamental angular frequency, the angular frequency corresponding to each harmonic and interharmonic, and the number of harmonics and interharmonics in the model; S4, performing hierarchical progressive solving on the optimal solution of amplitude and phase parameters in the model to obtain the values of the amplitude and the phase in the model; and S5, determining the harmonic and interharmonic model according to the obtained parameter values. According to the method provided by thepresent invention, when solving the optimal solution of the amplitude and phase, a hierarchical search method is used from a coarse-to-fine order: the preliminary estimation value near the optimal solution is first determined, and then starting from the preliminary estimation value, three search modes of a producer, a tracker and a escaper are used to search with different search steps in different search angles, so that the accuracy of harmonic and interharmonic detection is greatly improved.
Description
technical field [0001] The invention belongs to the field of electrical information detection, and more specifically relates to a detection method for harmonics and interharmonics. Background technique [0002] With the development of modern information technology and industrial automation technology, a large number of power electronic equipment and nonlinear equipment are put into the grid, and harmonics and interharmonics are generated in the grid. Harmonics and inter-harmonics will not only reduce the efficiency of the power grid, but also cause series and parallel resonance of the power grid, and even burn out electrical equipment in severe cases, causing great hidden dangers to industrial production and social safety. Therefore, to make power electronics and nonlinear equipment work stably, reduce unnecessary losses, and realize fast and accurate measurement of harmonics and interharmonics is a very important prerequisite. [0003] Currently, commonly used detection me...
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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 李开成倪威
Owner HUAZHONG UNIV OF SCI & TECH