Power system harmonic detection device and method based on full-period synchronous sampling

Abstract

The present invention provides a power system harmonic detection device and method based on full-period synchronous sampling. The harmonic detection device comprises a current transformer, a voltage transformer, a signal conditioning circuit, an A / D conversion module, a phase-locked loop frequency multiplier circuit and a signal collection processing module; the harmonic detection device obtains current and voltage information through the current transformer and the voltage transformer, performs conditioning for the detected current and voltage information through the signal conditioning circuit, converts the detected current and voltage information to digital signals through the A / D conversion module and inputs the digital signals to the signal collection processing module, and the signalcollection processing module performs monitoring and analysis calculation for the voltage fundamental frequency and the current fundamental frequency to achieve a harmonic detection function and store and display a detection result. The power system harmonic detection device and method based on full-period synchronous sampling can effectively improve the accuracy of the power harmonic detection.

Description

technical field [0001] The invention belongs to the technical field of power detection, and in particular relates to a power system harmonic detection device and a detection method based on full-period synchronous sampling. Background technique [0002] Since entering the electrical age, electricity has become an indispensable and important energy source in the 21st century. With the continuous progress of society and the rapid development of economy, human production and living standards have been greatly improved. Various models in the power system Non-linear loads such as electric motors, rectifiers, electric arc furnaces, and AC / DC converters, as well as impact loads continue to increase, resulting in more serious power harmonic problems in public power grids. The direct manifestation of the impact of these nonlinear loads on the power system is the serious distortion of the current and voltage waveforms. Not only the sinusoidal quantity with the same frequency as the po...

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Problems solved by technology

At present, the frequency resolution of power harmonic detection technology is not high, and it is easily affected by spectrum leakage. How to improve and optimize it has become one of the tasks of power harmonic detection technology.

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