Aiming at the problem of low precision of harmonic detection in shunt active power filter（ SAPF） device under the condition of traditional large power and high voltage

an adaptive harmonic current detection algorithm based on improved momentum factor optimization Adaline network is proposed. The two-momentum factor modified Adaline network weight adjustment formula is introduced to improve network stability and accelerate convergence.A cascaded H bridge SAPF simulation model based on the improved momentum factor Adaline algorithm is constructed by using the carrier phase shifted-sinusoidal pulse width modulation（ CPS-SPWM） modulation method.Simulation results show that

compared with the traditional Adaline detection algorithm

the proposed algorithm reduces the response error by 16. 56 %

improves the convergence rate by 33. 33 %

and has a better current detection effect.