An Adjustable Algorithm for Power Spike Smoothing

Rapid switching of the power switches inside a grid-connected power converter causes a huge number of high-frequency spikes, which could degrade the power converters' functioning. The power spike smoothing algorithm is a digital solution to removing these switching spikes from the sensor measurement. It uses the wavelet decomposition to reveal the high-frequency components so that specific suppression policy could apply. Reconstruction from the original low-frequency components and reduced high-frequency components result in the smoothing effect in the output waveform, and the degree of the smoothing effect is adjustable depending on the variance of each power converter through the parameter shrinkage degree.