This paper aims at the need for large compensation reactive power requirements when harmonic suppression.The current commonly used hybrid active power filter topology was analyzed and compared and a novel structure that is hybrid active power filter with injection structure was used.In accordance with the features of active power filter （APF）system that its reference signal is resultant quantity of each order of harmonic with the period of common multiple of 20 ms

and the quantity of its reference current is periodic

PI arithmetic of recursive integral was proposed on the base of traditional PI arithmetic.Then

the simulated model was built by PSIM simulation software.The theory and simulation result proves that HAPFIS can realize more precise control

faster response speed and more ideal compensate effect.