resumo
- In this work, control strategies for active filters are presented. They are based on the set of active and non-active power definitions proposed by Fryze in the 30’s of the last century and extended to power electronics applications in the 80’s. Basically three control algorithms are described, which are the Sinusoidal Fryze Currents, the Sinusoidal Fryze Voltages, and a Damping Controller. By using these control algorithms it is possible to verify that, in a three-phase three-wire system, the source currents, drained from the network, and the load voltages, delivered to the load, are pure sinusoidal waveforms, in phase with the fundamental positive sequence component of the system voltage. Simulation results of the UPQC conditioner (Unified Power Quality Conditioner) are shown in order to validate the proposed control strategies.