For solving such power quality problem as harmonic and reactive power of the aluminum factory

in this paper

a large capacity active power filter harmonic and reactive power compensation device is raised to suppress the harmonic component in large capacity under load dynamic compensation of reactive component objective through parallel connection of APF and TSC.Both the structure and working principle of the device is analyzed

the working principle of parallel type reactive power filter and reactive compensation principle of TSC are specifically introduced

and such double looped ring strategy controlled by external ring of voltage and internal ring of current is proposed

thus assuring stable voltage at DC side of active filter

achieving harmonic suppression and sustaining reactive compensation.And the final result complies with requirement.