Single-phase inverters are widely employed in renewable energy applications. However, their inherent 2ω-ripple power can substantially affect system performance, leading to fluctuations the maximum points (MPP) of photovoltaic (PV) systems and shortening lifespans fuel cell (FC) systems. To alleviate input ripple, a three-leg quasi-Z-source inverter (QZSI) its associated control strategy propos...

Photovoltaic power generation systems are one of the main renewable sources, and quasi-Z-source inverters becoming powerful devices to integrate these in AC grids. However, stability issues due damping behaviour converters must be considered. There several studies this direction but instability concerns not completely solved yet. This paper contributes with a procedure for assessment photovolta...

This paper proposes an optimized harmonic reduction pulse width modulation (HRPWM) control strategy for three-phase quasi Z-source inverter (qZSI). In traditional sinusoidal or space vector techniques, the flexibility in adjustment of individual switching angles is not possible and thus, these techniques are optimum choices low frequency operations high/medium power qZSI. proposed technique, ad...

Compared with the traditional converter, switching inductance quasi-Z source DC-DC boost converter has characteristics of wide output voltage, small capacitor size and more reliable circuit. However, in process DC voltage boost, system is prone to high startup impulse fluctuation, other problems. Therefore, a double integral sliding mode control (DISMC) method proposed. The takes capacitance er...

This paper proposes a new topology of quasiZ-source inverter(qZSI) which is used as step-up isolated dc/dc converter for residential fuel cell (FC) power systems .The proposed topology used is cascaded quasi Z source inverter and implemented using induction motor. The cascaded qZSI is derived by the adding of one diode, one inductor and two capacitors to the traditional qZSI. The proposed two-s...

Recent discussions of observational constraints on the standard hot big bang model are reviewed and it is argued that now there is room for considering alternative cosmologies. The quasi-steady state cosmology is brieey described. This model seems to explain most of the observed features of the universe, including the m-z relation, radio source count, the light nuclear abundances and the microw...