Many commercial phasor measurement units (PMUs) extract phasors using the standard discrete Fourier transform (DFT) that has some inherent drawbacks such as leakage and picket fence effects. The standard DFT based PMUs employ additional filtering to overcome these effects, but the smart DFT (SDFT) algorithm is capable achieving the required accuracy with minimum or no additional filtering. The benefits of SDFT can outweigh the additional computational complexity in real-time implementation. This paper investigates the implementation of a SDFT based PMU model in a real-time simulator. Various aspects relevant to real-time implementation such as data sampling, time synchronization, and measurement streaming according to C37.118 format are addressed. Performances of the developed SDFT PMU model are evaluated according to the latest IEEE synchrophasor standard and compared with the reference M-Class algorithm.
D. R. Gurusinghe, D. Ouellette, and A. D. Rajapakse, in Proc. The International Conference on Power Systems Transients (IPST), Seoul, Republic of Korea, June 2017.
KEYWORDS: Discrete Fourier Transform (DFT), Smart DFT, Phasor Estimation, Phasor Measurement Unit, Real-time Digital Simulator.