Current Control Schemes for Shunt Active Filters: Predictive Algorithms

This paper shows a new strategy to calculate the reference current in a power active filter used to mitigate harmonics injected by non-linear loads and analyze the performance of this for the different current control schemes. The reference current and the filter current are predicted a sampling period ahead to reduce and compensate the delay time effects caused by the acquisition times, the data processing and the performance of the filter. A Kalman filter predicts the reference current, whereas the filter current is predicted with the delta modulation or dead-beat methods