  The paper proposes a synchropahsor estimation (SE) algorithm that leverages
the use of a delayed in-quadrature complex signal to mitigate the
self-interference of the fundamental tone. The estimator, which uses a
three-point IpDFT combined with a three-cycle Hanning window, incorporates a
new detection mechanism to iteratively estimate and remove the effects caused
by interfering tones within the out-of-band interference (OOBI) range. The main
feature of the method is its ability to detect interfering tones with an
amplitude lower than that adopted by the IEC/IEEE Std. 60255-118, this
detection being notably challenging. Furthermore, it simultaneously satisfies
all the accuracy requirements for the P and M phasor measurement unit (PMU)
performance classes, while offering a reduction in the total computational cost
compared to other state-of-the-art techniques. Despite an increase in total
memory requirements, a preliminary analysis reveals its suitability for
implementation on embedded devices.
