Aplicação do método de otimização metaheurístico evolução diferencial para a sintonia de controladores de corrente e de tensão em um condicionador unificado de qualidade de energia

Abstract

Parallel to the increase in demand for electricity, the concern with power quality has intensified over the years, due to losses and damages to equipment connected to the distribution system. In this scenario, there are studies in the field of power electronics on Unified Power Quality Conditioners (UPQC), devices that aim to mitigate power quality disturbances related to voltage and current quantities. The internal control structure of UPQC has the objective of generating compensation components that mitigate the mentioned problems. Proportional- Integral controllers are present in this structure in the voltage and current control loops of the series and parallel converters, where the tuning of these controllers is essential for the correct functioning of the system. To adjust the gains of these controllers, classical methods of control theory can be applied, however, when using such methods, numerous tests are needed, generally empirical, which take time. Thus, the present work proposes the application of the Differential Evolution metaheuristic method in the tuning of PI controllers of voltage and current control loops of an Unified Power Quality Conditioner through computer simulations. The algorithm will be applied considering the minimization of cost functions related to the dynamic performance of the involved control loops, such as total harmonic distortion rates (THD) of the quantities involved and loop error internal controls.