Аннотация
The main focus of this article is to investigate the
effects of Adaptive control on the switching frequency and
Total Harmonic Distortion of a modified, minimally switched
hysteresis controlled shunt active power filter. Reference
current generation was done using Instantaneous real and
reactive power algorithm. Pulses to the minimally switched
grid interactive inverter in which only two switches are
controlled at a time, had been generated using a modified
hysteresis current controller. Use of Modified Hysteresis
controller results in reducing the switching loses to one-third
but results in increase in current THD than the conventional
hysteresis controller. To overcome this, pulses to the modified
hysteresis controller were generated employing adaptive
control by modifying pulses from a conventional hysteresis
controller. Using adaptive control instantaneous switching
frequency was reduced and maintained nearly constant and
THD was brought to the limits specified by the standards,
thus overcoming the disadvantage of conventional and modified
hysteresis controller which has variable switching frequency.
A comparison of Modified Hysteresis controller with and
without Adaptive control has been made, to show the reduction
in THD. The system was simulated using MATLAB-
SIMULINK.
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