Resonant Current Controllers Design Methods for Active Power Filters

Power quality evaluation is one of the always present topics in electrical engineering. Among the issues related to this, some are related more to the production and distribution of electrical energy and others related to the consumption. When dealing with the consumption of electrical energy, at any level, the most important factor is the harmonic pollution. As such, mitigating the effects of the current harmonics, and even more, compensating them is an important subject. For this, active filters are generally used, and their control structure is subject to many research initiatives. In this paper, different design methods for the harmonic controllers often used in medium level active filters are compared based on their dynamic behavior when faced with a reference very similar to the one obtained when mitigating the harmonic content of an electrical drive.