Abstract:
This paper presents single phase series
and shunt active filters to improve power quality by
reducing various power quality problems including
current harmonics, voltage sag, voltage swell and
voltage flicker. Voltage quality is improved by
series active filter by injecting compensating
voltage and current quality is improved by shunt
active filter by injecting compensating current.
Control strategy of series active filter contains two
main loops, one is for output voltage control loop
and another one is DC link voltage control loop.
Control strategy of active filter should maintain
constant voltage across DC side of the H Bridge
and second objective is to maintain harmonic free
sinusoidal source current in phase with source
voltage. Simulation and experimental results are
carried out for both filters to check the
effectiveness of proposed control strategies.
