Harmonic current forecasting method for hybrid active power filter based on optimal linear prediction theory

It is considered as an effective method to improve the effects of hybrid active power filter on harmonic current prediction. Harmonic current forecasting method for hybrid active power filter based on forward linear prediction theory was proposed in this paper. The optimal forecasting coefficient canonical equation, minimum forecasting errors and rank update equation were deduced. Take example for low order filter, the forecasting coefficient and minimum forecasting errors of one three order filter were given. This method could predict next time harmonic current, to realize minimum errors compensation by adaptive forecasting control. The simulation results show that the method has high forecasting precision and good compensation effect.