This paper presents the design and implementation of H-bridge converter with additional switch legs (HA converter) which acts as AC-DC rectifier as well as DC-AC inverter. In this topology a solid connection is provided between the grounds of the input and output terminals, which reduces common mode noise and makes the converter suitable for PV PCS in dc distribution system or stand-alone power...

This letter presents a method of implementing the extra element theorem (EET) on the computer by using the nullor method. The EET involves the calculation of two driving-point impedances (dpi’s), namely the conventional dpi, Z $ , and the null dpi, Z / . The proposed method is used mainly for calculating Z / . The method is simplified by representing any given circuit using exclusively RC-nullo...

Renewable energy sources are being widely used for Distributed Generation (fuel cells, solar panels, Wind power generators etc..,) because of their advantages. But they produce a very low output voltage. To interconnect a low-dc-voltage to residential loads a special voltage matching converter is required. This paper presents a back to back connection of cascaded quasi-Z-source network based st...

In the paper boost converter characteristics at the steady state obtained from SPICE analysis with the use of selected kinds of MOSFET models of various complexity and accuracy are compared. The dependencies of the converter output voltage, the watt-hour efficiency and the MOSFET inner temperature on the frequency and the duty cycle of the MOSFET control signal as well as the converter load res...

I. Leššo, P. Flegner, J. Futó, Z. Sabová Technical University of Košice, BERG Faculty, Košice, Slovakia The contribution deals with some questions associated with utilization of mathematical spaces, especially Hilbert spaces, in the area of process control. The authors of the paper point out the possible method of prediction of undesirable leaks of CO gas in oxygen converter in steel production...

This paper presents a new high-power step-up DC/DC converter topology with high-frequency isolation intended for residential fuel cell power systems. In contrast to traditional voltage source converters, the proposed topology utilizes the Z-source (impedance source) network represented by a combination of two inductors and two capacitors on the input side of the DC/DC converter. Due to the spec...

When LCL filters are applied to digitally controlled grid-connected inverters, the design of controllers is usually implemented using classic average models. The accuracy of these models in s-domain is only guaranteed in low frequency range. In order to predict the dynamic behaviors, new smallsignal z-domain models are deduced for digitally controlled gridconnected inverters with converter curr...