Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) systems because they allow energy single stage operation. However, can cause system resonances and reduce damping, which may lead to instabilities. These stability problems well known grid-connected voltage source converter but not quasi-Z-source inverter (qZSI)-based PV systems. This paper...

A quasi-Z-source inverter with a novel carrier based pulse width modulation (PWM) scheme is proposed for photovoltaic power generation systems. In this new technique, a high frequency sine wave is employed as carrier waveform instead of the conventional triangular wave in the simple boost technique. This increasess the shoot-through duty cycle for the given modulation index and hence the voltag...

Quasi-Z-Source Cascaded H-bridge Multilevel inverters (qZS-CHB-MLI) have attracted much interest in recent research works due to its rewarding advantages when compared with traditional voltage source inverters and Z-source Inverters. The qZS-CHB-MLI has limited output voltage boosting capability, and requires more number of switches as the number of levels increases. This increases the volume a...

We prove that PSL2(Z[ 1 p ]) gives the first example of groups which are not quasi-isometric to each other but have the same quasi-isometry group. Namely, PSL2(Z[ 1 p ]) and PSL2(Z[ 1 q ]) are not quasi-isometric unless p = q, and, independent of p, the quasi-isometry group of PSL2(Z[ 1 p ]) is PSL2(Q). In addition, we characterize PSL2(Z[ 1 p ]) uniquely among all finitely generated groups by ...

We analyzed the recently published kHz QPO data in the neutron star low-mass X-ray binaries (LMXBs), in order to investigate the different correlations of the twin peak kilohertz quasi-periodic oscillations (kHz QPOs) in bright Z sources and in the less luminous Atoll sources. We find that a power-law relation ν1 ∼ ν 2 between the upper and the lower kHz QPOs with different indices: b ≃1.5 for ...

This paper explores Switched Inductor (SL) Quasi Z-source Inverter which has high boost factor and performance when compared to other Z-Source inverters along with three control methods: simple boost, maximum boost and maximum constant boost. The proposed inverter improves the input current, reduces the passive count and also the reliability. The simulations are done in MATLAB/Simulink environm...