A new analogical method of voltage perturbation extraction for series active power filters

A low voltage dynamic voltage restorer with self-charging capability

“…An analogical method has been used for voltage perturbation identification of the supply voltage [7]. This method is based on using a 4 th order Band Pass analogue Filter (BPF) that passes only the first harmonic component of the perturbed supply voltage without adding any phase-shift to the fundamental component.…”

“…However, it is sensitive to the voltage phase jumps [7,12]. Therefore, in these cases another method is used for identifying voltage distortions which is based on a digital phase locked loop (DPLL) proposed in [12,13].…”

“…Among the different voltage distortions, voltage sags (dips) are the sever one in the electrical distribution systems. The principal cause of all voltage sags is a short-duration increase in current [1][2][3][4][5][6][7][8].…”