A Study On Algorithm And Equipment For Power System Harmonics Analysis Based On Embedded System

With the rapid development of electrical technology, various new devices, new load after another, they produce a lot of harmonics on power system security caused great harm, harmonic problems have become a growing concern everyone. Thereby increasing the level of detection for harmonic problems, for improving the environment and improve the power grid's safety is very important.This article first foreign power harmonic detection technology, gave a brief introduction, but also on the power harmonics and the fundamental nature of the harm caused elaborated on the main test for the harmonic detection method and detection equipment summarized.Then, windows and interpolation FFT algorithms is in-depth study for harmonics detection methods. A window based on three cosine interpolation exact-Blackman window FFT algorithm. Discussion of the exact-Blackman window frequency response, are derived based on the exact-Blackman window FFT algorithm of interpolation formula, making the new interpolated FFT algorithm to improve power system harmonic measurement accuracy. Under the new algorithm, it takes advantage of the platform of MATLAB to develop a computer program for Simulation. Simulation results show that this new algorithms has high precision with less sampling period. It is also applicable to power system harmonics detection.And then study the theories and technologies based on the detection accuracy for harmonic and real-time requirements, combined with the current relevant technical means, a dual-CPU based on DSP and ARM core, harmonic detection device fully display DSP in the data processing on the advantages and the ARM's superiority in the control and management in order to complete system requirements. And described in detail the various parts of the design of functional modules.In the algorithm based on the design of the software part of the system. The systemμC/OS-Ⅱmigration of the ARM part is operated. MiniGUI is developed in the system. It make people more flexible and convenient computer interaction.