Since the birth of the power system, the power system harmonics have been twinned. With the widespread application of electronic devices, the harmonic problem has become increasingly serious, and power harmonics have become a public nuisance in the power system. Harmonic detection is an important branch of harmonic research and the basis for solving other related harmonic problems. Therefore, the research on harmonic detection has important theoretical significance and practical value. This paper mainly discusses the relevant issues of high-precision and high-real-time harmonic detection digital systems from the perspective of harmonic detection theory and implementation methods. The paper explains the relevant concepts and generation principles of power system harmonics and analyzes the characteristics of power harmonics. In terms of detection theory, this paper uses FFT theory to calculate the harmonic content, studies the application of Radix-2FFT in harmonic detection, describes the spectrum leakage phenomenon in the FFT analysis process, and theoretically studies the root cause of spectrum leakage. In order to solve the problem of spectrum leakage, this paper proposes a phase-locked frequency multiplication technology method to track the frequency changes of the power system power frequency, thereby effectively reducing spectrum leakage. In harmonic detection, FFT has a large amount of calculation and strict requirements on speed and accuracy. This paper explores the method of using FPGA to implement FFT signal processing.
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