Attenuated Self-Interference Synchrophasor Estimation: The Sogi Interpolated Dft

In this paper, a synchrophasor estimation (SE) algorithm is presented to simultaneously comply with the requirements for the P and M phasor measurement unit (PMU) performance classes. The method employs a second-order generalized integrator (SOGI) quadrature signal generator (QSG) filter to attenuate the self-interference of the fundamental tone. Inspired by other static state-of-the-art SE methods, the algorithm combines a three-point IpDFT with a three-cycle Hanning window, while delivering a reduction in the total computational cost in return for higher memory requirements. Its performance with respect to all the operating conditions defined by the IEC/IEEE Std. 60255-118 is assessed and compared with another state-of-the-art technique. Furthermore, a computational complexity analysis is performed to assess the potential viability of the proposed SE algorithm for its implementation in embedded devices.