A state-of-the-art PMU based monitoring system with Intelligent Electronic Device using microcontroller

The main objective of this paper is to monitor the phasors of voltages and currents at the sending and receiving ends of a transmission line using a microcontroller based Phasor Measurement Unit (PMU). The PMU is designed and developed to acquire the samples of voltage and current signals of the line ends in a synchronized time reference frame. The voltage and current samples from the PMUs are collected and stored in a PC using a microcontroller based Intelligent Electronic Device (IED). A MATLAB based front end graphical user interface (GUI) is developed to acquire these data using the PC´s serial port. The IED coordinates all the time synchronization pulses to the PMUs and maintains a sequential routing for the data collection from them. The overall functioning of the PMUs, IED and the GUI is tested in a laboratory model of the power system and satisfactory performance is obtained.