Approach to design of a PID controller for an AVR system and stability analysis through co-simulation using MATLAB and DIgSILENT PowerFactory

Abstract

Nowadays we are observing day by day the exponential growth of the power network and the different subsystems that this involves, therefore, it is necessary to model or simulate those systems trying to emulate their actual behavior accurately, some of these systems require modeling physical, mechanical, or electrical variables at the same time; considering this, a multidomain analysis is necessary. There is specialized software according to those domains or the specific task required like MATLAB / Simulink, which is a great tool for analyzing control systems, as well as DIgSILENT PowerFactory for modeling electrical power systems. That is why it is intended to get the best from both application software in a co-simulation to accomplish the objectives of this study. This document presents the design and tuning of a PID controller for the excitation system AVR using the Control System Designer toolbox from MATLAB; this system is subsequently tested under load with the synchronous machine running online with the power system, this is done through a co-simulation, interfacing MATLAB and DIgSILENT PowerFactory. Then we analyze the behavior of the system when is subjected to small signal disturbances to evaluate the performance of the controller and the voltage stability behavior of the power system. Finally,the reached Co-Simulation study proves to be a useful and powerful methodology to study the dynamics of the power system in this case, and it is presented as a possible solution for the simulation of future energy systems that integrate multiple domains. For the full-length paper go to https://www.ripublication.com/adsa22/v17n2p02.pdf