Title :
A novel real-time magnitude and frequency estimation method using DFT zero-crossings
Author :
NinkovicÌ, Predrag
Author_Institution :
Control Dept., Univ. of Belgrade, Belgrade, Serbia
Abstract :
This paper presents a novel method for calculation of magnitude and frequency of single-phase voltage sources in hard real-time applications. It is developed for supervision of renewable power sources, both for converter and grid side. The method is based on Discrete Fourier Transform (DFT) of input signal, but it avoids the DFT errors due to off-nominal frequency operation. Steady-state error and second-harmonic oscillations in output signal are decreased within acceptable levels for all frequencies of interest. Accuracy of 20mHz for frequency and 0,2% for magnitude without harmonic content in input signal is obtained. The method described is applied on ARM7TDMI microcontroller platform and verified by experiments.
Keywords :
discrete Fourier transforms; frequency estimation; harmonic analysis; microcontrollers; power convertors; power grids; renewable energy sources; ARM7TDMI microcontroller platform; DFT zero crossing detection; discrete Fourier transform; frequency estimation method; grid side; off-nominal frequency operation; power converter; real-time magnitude estimation method; renewable power source; second-harmonic oscillation; single phase voltage source; steady-state error; Accuracy; Discrete Fourier transforms; Frequency estimation; Harmonic analysis; Microcontrollers; Real-time systems; Discrete Fourier Transform; Frequency Estimation; Magnitude Estimation; Real-Time; Zero-Crossing Detection;
Conference_Titel :
Industrial Electronics (ISIE), 2014 IEEE 23rd International Symposium on
Conference_Location :
Istanbul
DOI :
10.1109/ISIE.2014.6864738
