Robust estimation of fundamental frequency positive-sequence component for grid-integration applications in energy systems

Abstract

This article studies the problem of fundamental frequency positive-sequence component separation in unbalanced three-phase systems for grid-integration applications. We propose a-simple-to-implement approach involving a modified delayed signal cancellation method and moving average filtering. A delay-based linear-regression framework is considered to make the sequence component separation frequency-adaptive, providing fast and accurate frequency estimation. Comparative experimental results demonstrate the suitability of the proposed method over conventional approaches.

Keywords

• Sequence estimation
• Unbalanced voltage
• Delayed signal cancellation