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This paper presents a universal active filter for harmonic and reactive power compensation with UPS (uninterruptible power supplies) features. The configurations does not use transformer in the series part. Transformerless modern UPS systems have been rapidly replacing the old technology due to their performance and size attributes. Reducing the numbers of passive elements and/or switches in active...
This paper proposes a multimotor drive based on a commercial three-leg converter. The topology is composed by a standard three-leg converter supplying two machines in a parallel connection. A Permanent-magnet synchronous motor (PMSM) and Single-phase induction motor (SPIM) are used in this work. The configuration is suitable for applications which is required independent control of two machines from...
This paper proposes a speed sensorless control for PMSM motor drive system. The sensorless strategy is based on back-emf estimation of the motor, suited for applications at high speed. The drive system uses a four-switches three-phase inverter. This topology is attractive specially in fault conditions in one leg of the conventional three-phase converter. The speed sensorless vector control based on...
This paper proposes some topologies of universal active power filter for single-phase applications with reduced number of components. Three topologies with transformer connected in parallel side are proposed: one in which both input and output converters are connected in half-bridge and the others two share a common leg, with one leg connected as half-bridge and the other one as a full-bridge. All...
This paper presents an universal active filter for harmonic and reactive power compensation in single-phase system. It is a combined system of a series active filter and a shunt active filter without use of transformer. The proposed system is suitable for applications where the size is a critical factor. The model of the system is derived and it is shown that the circulating current is an important...
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