Real-time implementation of a novel vector-locked loop for synchronous extraction of harmonics in power systems

Abstract

The extraction of the harmonics and or the fundamental from a distorted waveform is an important process in the implementation of custom power devices. Several schemes have been proposed in the past towards this. In this paper the principle of operation, performance, and design aspects of a novel scheme of a vector-locked loop (VLL) for synchronous extraction of the harmonics and or the fundamental from a distorted periodic waveform is briefly described and real-time hardware emulation results are presented. Main features of the VLL are: simplicity, excellent insensitivity to harmonics, noise rejection, availability of both fundamental and harmonics without additional processing, and the good speed of operation. Some results from the real-time hardware emulation of the scheme on a dSPACE-Modular system are presented and compared with the results from MATLAB®/Simulink®.