Application of Frequency Estimation Techniques to Minimize Power Quality Problem

Abstract

Through the use of a technique known as frequency estimation, the objective of this study is to explore a topic that pertains to power quality and the elimination of harmonics in the power system. Under a wide range of less-than-ideal conditions, such as voltage imbalance, harmonics, dc-offset, and so on, the objective of this research is to investigate the performance of a number of different methodologies for estimating phase and frequency. The bulk of the techniques have been shown to be incapable of estimating the frequency of the grid signals when the grid signals are characterized by dc-offset. This has been demonstrated via the use of a number of different methods. An approach to frequency estimation that is referred to as modified dual second order generalized (MDSOGI) is presented in this article. Under all of the circumstances that are not perfect, this technique makes an accurate prediction as to the frequency with which it occurs. It has been shown by experiments that the results are correct. It is necessary to further integrate the control scheme with the notion of instantaneous reactive power in order to construct a control scheme for a shunt active power filter that is capable of functioning under such conditions. A prototype for the experimental system is now being developed in order to show improved performance capacity.