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An HVDC system based on a Cockcroft-Walton (CW-HVDC) topology is presented and a novel strategy is proposed to analyze and control the converter. In the connection to the grid the CW-HVDC uses a 3×2 matrix converter. The CW-HVDC voltage state-space vectors are derived and used to control the AC currents, guaranteeing nearly unitary power factor in the connection to the grid. Sliding mode controllers...
HVDC transmission systems based on voltage source converters have lately emerged as a good alternative to conventional AC transmission. In these transmission systems multilevel converters have become a promising energy conversion technology. The reliability of the power converters are extremely important since a fault in these equipments may lead to an unavailability for a long period of the transmission...
Several multilevel inverters have been proposed and extensively studied. The main topologies are the neutral point clamped inverter, the flying capacitor inverter and the cascaded connection of bridge inverters. A modular recently proposed alternative is the dual inverter configuration. This topology requires only two classical three phase voltage source inverters. One of the characteristics of this...
The three-level active neutral point clamped converter (ANPC) allows to overcame the problem of unequal loss distribution among semiconductor devices that appears in the classical neutral point clamped converter NPC. Another advantage of this power converter is that it can operate under faulty conditions. In this paper the study of the ANPC using a voltage sliding mode controller for a vector modulator...
This paper describes a new resonant converter topology, using a solid-state asymmetric bridge to increase the energy efficiency of the solid-state switching circuit being designed to replace the actual pulse transformer and thyratron based resonant modulator that supplies the 60 kV target potential for the ion acceleration of the On-Line Isotope Mass Separator ISOLDE accelerator. The preliminary results...
A new filter topology and control system to improve input current waveforms of Sparse Matrix Converters (SMC) is presented. The topology is based on an Indirect Sparse Matrix Converter fitted with input ac filter, aided by a small dc link 2nd order filter, with smaller parameters compared to the ac input filter. The control system is designed to regulate the input current and dc link capacitor voltage,...
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