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This paper proposed two universal active power filter (UAPF) topologies for reactive power and harmonic compensation. The proposed system is a combination of series and shunt active power filters. They are suitable to improve the harmonic distortion in the grid currents and a voltage compensation. The filters are composed of three three-phase converters resulting in nine legs. The first (configuration...
This paper presents two universal active power filter (UAPF) configurations for reactive power and harmonic compensation without series isolation transformer. The proposed systems combine both series and shunt compensation, by using converters with one (configuration I) or two (configuration II) dc-links. They are suitable for applications in which size, weight and cost associated with transformers...
This paper presents a shunt active power filter based on the concept of open-end winding (OEW) transformers. The proposed configuration is constituted of two converters with three legs each series connected throughout a three-phase OEW transformer. Model PWM strategy and control scheme are presented as well. The main advantage of the proposed system lies on the multi-level waveform generation, which...
This paper presents a hybrid PWM (HPWM) strategy for a voltage source inverter used to supply open-end winding (OEW) equipment. Such equipment can be either an electrical machine in a motor drive system or a transformer in dynamic voltage restorer. The technique described in this paper combines the theory of space-vector PWM (SVPWM) with the easy implementation of a sinusoidal PWM (SPWM). Simulation...
This paper presents a dynamic voltage restorer (DVR) obtained through a series connection of two three-phase inverters. Such connection is obtained due to open-end winding arrangement of the transformer. As done in a conventional configuration, the proposed one aims to regulate the voltage at the load terminal in the case of sags/swell, distortion, or unbalance in the grid voltage. A suitable control...
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