Single phase shunt active filter with digital control

Abstract

Abstract. This paper presents a single-phase shunt active filter designed to minimize problems related to power quality in electrical systems. The power stage of the active filter is based on a two-leg full-bridge inverter, with a single capacitor in the dc side, and a filter inductor in the ac side. The control system is based on the instantaneous power theory in the α-β-0 reference frame (pq-theory), derived to be applied in singlephase systems. In essence, the shunt active filter is designed to drain, from the electric grid, harmonic and reactive components of the load currents, such that the system current will become, basically, a sinusoidal waveform, with low harmonic distortion, and in phase with the system voltage. Simulation results of the shunt active filter operating with three different loads are presented in order to verify its performance.

Least Mean Squares and Recursive Least Squares Algorithms for Total Harmonic Distortion Reduction Using Shunt Active Power Filter Control

“…Neither of the above-mentioned three-phase algorithms satisfies this requirement. Of course, there are different variants for single-phase systems, e.g., p-q theory [57,58], but this requires modification of the algorithm for each system. The next requirement is the real-time operating of the algorithms.…”

Single Phase Power Factor Improvement Based Instantaneous Power P Q Theorm

“…The signal is obtained from a comparator that compares the carrier sinusoidal signal with the reference current. The signal is constructed by adjusting the reference current hysteresis in the comparator to produce a signal pattern [5] In this section the reference current is forced into the sinusoidal path of the carrier signal. So this inverter seems to be a current source that makes the net current become sinusoidal.…”

Integration of CFA 2 FB control scheme with modified shunt active line conditioner ( MSALC ) connected distribution system for mitigation of harmonics

“…The MSALC using CFA 2 FB technique is proposed, designed and simulated using MATLAB simulation tool to eliminate existing harmonics along with reactive power compensation based achieve unity power factor in the distribution line. 40 High lightly, all the power system perturbations such as system uncertainties, load constant variations and other perturbations like harmonics, unbalances in load might retard the dynamic performance of the SALC are considered. In the earlier research, time delay presence makes the system slow to respond at the remarked tracking point.…”