Application of Dynamic Phasor Model as an Alternative to DFT in Phasor Measurement

Abstract

This paper presents the application of dynamic phasor based models as an alternative to the Discrete Fourier Transform (DFT) commonly used in the Phasor Measurement Units (PMU). The paper demonstrates that the computation of a phasor using DFT in discrete time domain is equivalent to the computation of phasor (Dynamic Phasor) in continuous time domain. This paper proposes the application of dynamic phasor based models to simulate a Wide Area Measurement System (WAMS) without DFT. The potential application of this work is for the analysis of WAMS. A wide area controller can be tuned with dynamic phasor based model. In addition to this, dynamic phasor based simulation for a WAMS runs faster compared to that with a DFT algorithm as we can select larger step size. In order to verify the proposed concept, a case study of two area system is considered in this paper. The transients captured for different disturbances with a dynamic phasor model and the conventional model with a DFT algorithm closely match each other.

Keywords: Dynamic phasor model, phasor measurement unit, discrete Fourier transform, wide area measurement system

Cite this Article
Siddh MG, Chudasama MC. Application of Dynamic Phasor Model as an Alternative to DFT in Phasor Measurement. Journal of Power Electronics & Power Systems. 2018; 8(1): 46–52p.