documentation on shunt active filters on power quality improvement on technical seminar report and how it is useful and what is these and why this is useful
Problems caused by energy quality have a large adverse economic impact on profits and customers. Current harmonics are one of the most common power quality problems and are usually resolved by the use of passive or bypass active filters. In this article, we propose a new control design using artificial neural networks to make adaptive the conventional active shunt filter. The proposed bypass adaptive active filter can compensate for harmonic currents, power factor and non-linear load unbalance. An automatic charging technique is also proposed to regulate the voltage of the DC capacitor to the desired level with the use of a PI controller.
Recently, the widespread application of non-linear, time-varying devices has led to distortion of voltage and current waveforms in AC networks. Consequently, harmonics, sub-harmonics and inter-harmonics are frequently present in the voltage and current spectra. Passive filters are conventional solutions to mitigate harmonics, but limiting passive filters for compensation has made active filters attractive. Passive filters have been used as a conventional solution to solve harmonic current problems, but they have some disadvantages: they only filter the frequencies for which they were previously tuned; its operation can not be limited to a certain load or group of loads; resonance can occur due to the interaction between passive filters and other loads, with unexpected results. To address these disadvantages, recent efforts have focused on the development of active power filters. In this work we propose the development of an active derivation filter, with a control system based on the p-q theory. With this filter it is possible to efficiently compensate harmonic currents and reactive power (unit correction power factor), as well as to balance the supply currents (distribute the loads of the three phases in the same way and compensate for the current).