This work presents a study of shunt active power filters (APFs), which are implemented by means of both fourlegs and three full-bridge voltage source inverter (VSI) topologies. These topologies are applied in three-phase four-wire systems for reactive power compensation and harmonic current suppression generated by nonlinear loads. The compensation reference currents used in both APFs are extracted from the synchronous reference frame (SRF) based controllers. A mathematical analysis of the four-legs and the three full-bridge topologies are presented in order to obtain the model in state space and the transfer functions of each system, allowing to set the proportional-integral (PI) gains used in the current controllers. Simulation results are presented in order to evaluate the performance of the APFs approaches.
Abstract-This paper presents the application of fuzzy controllers to act in the current control loop of a shunt active power filter (SAPF). The SAPF consists of a three-phase inverter with four-leg topology, and it has been used to reduce the harmonic content produced by nonlinear loads, as well as, in the reactive power compensation. The generation of the reference currents is based on the synchronous reference frame (SRF), which requires the use of a PLL (Phase Locked Loop) synchronization algorithm with the grid. The classic PI control is here replaced by a fuzzy controller that has features that allows fast convergence and robustness when there are parametric variations in the physical system. Results obtained from simulations are presented to validate the approach and to demonstrate the performance of the filter in the suppression of harmonic currents and reactive power.
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