Sampling Systems With Fractional Delay and PCA Applied to High-Accuracy Measurements

For high-accuracy electrical measurements, sampling errors can contribute significantly to increase the incertitude. The fractional delay (FD) sampling technique is a simple and very efficient technique to reduce sampling errors, improving the measurement accuracy. Here, we combine the FD sampling technique with principal component analysis, applying this technique to high-accuracy ac voltage measurements, more specifically to the harmonic estimation of periodical signals. Theoretical results are backed by simulations and experimental results.