Active harmonic filters are complex devices that are important in achieving power quality in electrical systems. Such filters operate by actively compensating for harmonic currents produced by non-linear loads which help boost the efficiency of the entire power systems. They are designed with sophisticated algorithms that allow response to harmonics and remove them in real time, thus making sure that the equipment powered is within the normal range. This not only improves the functioning of electrical appliances but also results in energy preservation and lower operating expenses. For companies that want to decrease their energy costs and meet stringent power quality requirements, active harmonic filters must be incorporated into their electrical systems.