As the parameter of harmonic in the system of power supply to numerical control machine was measured
the simulation model of active power filter is established based on Matlab/Simulink and simulation results are gained. From the result of the simulation
the advanced Active Power Filter was adopted to cleaning constantly power grid. In the power grid
THD was reduced clearly and the power quality was improved
which the Numerical control machine can be usefully moving.The qualified efficiency of production parts is obviously improved.