A fast, accurate and robust algorithm to detect fundamental and harmonic sequences

This paper proposes a modified weighted least square estimation (WLSE) technique used in combination with a phase locked loop for fast and accurate reference generation, a key part in the control of ac power converters. Simulation and real-time implementation (dSpace DS1103) tests emulating realistic (distorted) environments have been performed. These results prove the excellent behavior and robustness of the WLSE employed as a specific sequence detector. A comparison in terms of transient response with other high performance methods is also contributed. The computational burden of the proposed WLSE is assessed.