| Abstract |
Grid voltage information, such as voltage amplitude, frequency, as well as phase-angle have been commonly estimated by employing phase-locked loop (PLL) schemes. However, supposing the estimated phase-angle signal is generated with some distortion, which can be caused by disturbances present in the mains voltages, very likely the control reference signals will also be distorted and can interfere in the performance of grid-connected systems.This paper evaluates the impacts caused by inaccurate detection of the utility phase-angle on the static performance of a three-phase parallel active power filter (P-APF). Taking into account that grid-connected system like P-APF uses the utility phase-angle to compute the compensation current references, inaccuracies in the phase-angle detection can cause not suitable operation and, hence, deteriorate its active filtering performance.By means of several experimental tests, which are performed under grid voltage distorted conditions, the performance of a three-phase P-APF is evaluated considering the interference of PLL schemes. |
