A dsp-based harmonic detection device and its detection method

Abstract

The invention discloses a DSP-based harmonic detection device and a detection method thereof. The device includes a data acquisition module, a DSP chip, a CPLD chip, a human-computer interaction module and a host computer. The upper computer connected with the communication interface, the DSP chip is connected with the data acquisition module and the power supply module. The present invention adopts the data processing device with the DSP chip as the main part and the CPLD chip as the auxiliary part and the harmonic detection method of DSP chip operation plus window value FFT combined with wavelet packet transformation, and the signal is processed quickly through the data acquisition module, which effectively improves the operating speed , can realize large-capacity calculations, effectively solve the problems of slow identification and positioning speed in the existing technology, realize high accuracy, fast identification and positioning, high stability, and have the characteristics of simple structure and detection method.

Description

technical field [0001] The invention belongs to the field of power quality detection, and in particular relates to a DSP-based harmonic detection device and a detection method thereof. Background technique [0002] In recent years, with the promotion of automation technology, various non-linear power electronic devices, such as converter equipment, frequency conversion equipment, etc., have been expanding in capacity and increasing in number. The direct manifestation of its impact on power devices is the periodic distortion of current and voltage waveforms. , that is, the generation of so-called power harmonics, which can reduce the efficiency of production, transmission and utilization of electric energy; cause electrical equipment to overheat, generate vibration and noise, and age insulation, shorten service life, and even cause partial Parallel resonance or series resonance is generated, which amplifies the harmonic content and causes the capacitor equipment to burn out. ...

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Problems solved by technology

[0004] However, market research found that most harmonic detectors such as imported FLUKE, Texas Instruments and other domestic brands such as Changsha Weisheng, Zhiyuan Electronics and other brands are expensive, the operating efficiency of the chip needs to be improved, and the algorithm is not enough to achieve higher precision harmonic detection. Wave detection, and the interaction effect with the host computer is not stable enough

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