In order to effectively compensate harmonics in grid current produced by non-linear loads and weaken the delay characteristic of the control system

a control strategy of current compensation about active power filter（APF） based on predictive function model is proposed. This control strategy is a way of predictive control. It uses the sampling data of current time and recently historic data to build predictive function model which is used to achieve predictive control of harmonic compensating current of active filter. Simulation results show that this method not only has accurate predictive ability for load current

but also has good suppression effect and compensation precision for harmonic current.