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As PV modules show low voltage outputs, in grid connected applications a converter with high voltage gain is needed. Standard PV conversion systems, addressing PV field composed by a large number of panels, show efficiency values up to 95-96%. Such a high efficiency is hard to reach in small power DC/DC converters with high input to output voltage ratio as those used in AC Modules. In this paper,...
In grid-connected application of distributed generation sets, accurate estimation of the phase of the grid voltage is a fundamental task for developing reliable control algorithms, especially in single-phase systems. Many algorithms have been proposed for estimation of the phase of the voltage grid based on Phased-Locked Loop (PLL) techniques. In this paper, in order to evaluate the performance in...
This paper presents an overview of the power converters that are adopted in PhotoVoltaic generation systems in the power range till 20 kW. For this type of renewable energy applications a double trend can be identified according to power conversion systems below few kW and higher than 3-5 kW. The paper deeply analyses both converter configurations also taking into consideration the control aspects...
Well established in low-voltage low- medium- power applications for their high efficiency, DC-DC converters are also widely used in high-voltage high-power Telecom and Industrial applications which are always demanding for higher and higher efficiency. 1200 V State-of-the-Art IGBTs are the best choice in the field of high Current and Three-phase DC-DC converter working at a switching frequency up...
In this paper an experimental investigation of the performances of a cascode monolithic device in a half bridge configuration is carried out, and a comparison is performed in the same converter in case IGBT devices are used. The device behavior during the reverse current conduction in the inverter leg is investigated and discussed. The experimental evidence shows that the cascode suffers the same...
Recently available on the market the emitter switched bipolar transistor (ESBT) having high voltage breakdown, low voltage drop, and low switching losses as well, represents an interesting alternative to other power transistors thus giving a new chance to further improve the system efficiency. This paper deals with a new silicon technology used to produce a high voltage monolithic cascode and gives...
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