PROJECT TITLE :
Fast Measurement of Dielectric Loss Angle With Time-Domain Quasi-Synchronous Algorithm
Fast Fourier transform (FFT) algorithm inevitably suffers from spectral leakage and picket-fence result under asynchronous sampling and nonintegral amount truncation. Therefore the FFT-primarily based dielectric loss angle (DLA) measurement needs window functions and spectral lines interpolation algorithm, which needs massive sampled information and high computational value. So, this paper proposes a DLA measurement methodology on the premise of your time-domain quasi-synchronous sampling technique to attain fast measurement and high accuracy. Initial, the basic frequencies of the first voltage and current sampled signals were estimated accurately with the time-domain Newton interpolation algorithm. Then, the quasi-synchronous sampled sequences (QSSA) of the original asynchronous sampled signals were reconstructed using cubic spline interpolation algorithm. Finally, the DLA was calculated in line with the equivalent circuit model and frequency-domain analysis of voltage and current QSSA primarily based on FFT. The proposed technique in this paper can perfectly restrain spectral leakage and picket-fence effect without window functions and spectral lines interpolation algorithm. The results of simulation and therefore the implementation on the embedded system have confirmed the effectiveness of the proposed algorithm during this paper with less sampled information and lower computational price.
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