Decoupled recursive-least-squares technique for extraction of instantaneous synchronized symmetrical components under fault conditions

This paper presents the decoupled recursive-least-squares (DRLS) technique for extraction of instantaneous synchronized symmetrical components under fault conditions in power grids. The proposed DRLS technique demonstrates outstanding robustness during faults, subsequent circuit breakers operation, and transmission line reclosing. The proposed DRLS technique also significantly reduces the computational burden of the conventional RLS technique for implementation on digital signal processors (DSPs). The performance of the proposed DRLS technique has been evaluated through presetting selected simulation results in MATLAB-Simulink software. DSP implementation of the DRLS technique also confirms considerable computational efficiency improvement in comparison with that of the conventional RLS technique. The DRLS technique also shows better efficiency in comparison with the enhanced phase-locked loop (EPLL) technique under highly distorted power system due to harmonics according to our implementation on two different R&D DSP platforms.