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Image Quality Assessment (IQA) remains a complex and challenging problem that has garnered great interest by the research community as well as industry. A majority of no-reference IQA metrics leverage handcrafted features which discriminates distortions from true image structures. Recently, deep neural networks (DNN) has been successfully applied on local image patches to estimate image quality, However,...
In this paper, first, a novel accurate small-signal model of a three-phase current source inverter (CSI)-based grid-connected photovoltaic (PV) system is derived. The model takes into account the nonlinear characteristics of PV arrays, as well as the controller and grid-side dynamics. Then, the developed small-signal model is employed to investigate the impact of different parameters on the stability...
Multilevel inverters have received considerable attention for their capability to realize high power ratings and high-quality waveforms, at low switch stress and losses. Multilevel inverter based on Voltage-Source Inverter (VSI) topology is more thoroughly researched when compared to Current-Source Inverter (CSI)-based multilevel inverter. In this paper, a multilevel structure based on CSI topology...
This paper proposes a grid-connected Photovoltaic (PV) system based on a multilevel Current Source Inverter (CSI) topology. The topology proposed here consists of parallel-connected CSI modules operating at a very low switching frequency. For n number of inverter modules, 2n+1 current levels are resulted in the output. In the multilevel inverter topology, each inverter module has its own PV source,...
Voltage-source inverter (VSI) topology is widely used for grid interfacing of distributed generation (DG) systems. However, when employed as the power conditioning unit in photovoltaic (PV) systems, VSI normally requires another power electronic converter stage to step up the voltage, thus adding to the cost and complexity of the system. To make the proliferation of grid-connected PV systems a successful...
One of the main issues related to the integration of Distributed Generation (DG) in the utility grid is safety. The protection schemes of distribution systems are usually designed under the assumption that power flows from distribution system to end users. If a fault takes place and a breaker opens, all circuits downstream will be deenergized. However, this is not the case when a DG is used, and it...
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