Design and Verification of a Phasor Measurement Unit Model Using Matlab

Todays power systems are becoming more and more complex due to the continuous increase in energy demand and high proliferation of intermittent renewable resources. Therefore, the system’s control and monitoring became very challenging. The usage of highly responsive phasor measurement units (PMUs) is one of the solutions that are making possible the real-time control and monitoring of electric systems. The available PMU block in the matlab/Simulink library is designed to provide only the magnitude, phase angle, and frequency of the positive-sequence component of a three-phase signal. This is a limitation when there is a need to analyze the real-time situations in all phases considering all symmetrical components in order to get accurate results, especially in case of unsymmetrical systems and more specifically in case of faults with ground current flows. This study develops a phasor measurement unit model in Matlab/Simulink, using Fourier Transforms (FT) and phase-locked loop (PLL) as phasor magnitude, phase angle, and frequency estimation tools, and then compares the results with the real PMU measurements.