The strong increase in the number of installed photovoltaic (PV) production plants has slowly changed assets and operating conditions electricity power system. In this context, supply control reactive from renewable generation are becoming an important issue to be exploited that can facilitate integration PV wind grids. aim paper is propose optimized strategy manage resource generated by order improve quality low/medium voltage distribution network meet latest technical requirements listed...

In this paper, we develop a mathematical model of blood circulation in the liver lobule. We aim to find pressure and flux distributions within also investigate effects changes that occur following resection part liver, which often leads high portal vein. The can be divided into functional units called lobules. Each lobule has hexagonal cross-section, assume its longitudinal extent is large compared with width. consider an infinite lattice identical lobules study two-dimensional flow...

The needs to actuate a sustainable energy transition is pushing the electricity system and its operators define new strategies solutions make more flexible resilient, include bigger share of renewable sources. This paper proposes novel flexibilization service for distribution exploiting capabilities Renewable Energy Communities through concept Virtual Islanding operation. paradigm can ease system, making them keener accommodate larger shares sources in grid. described methodology assess...

One of the main challenges in future power systems is enormous integration generation units using high converters as interface, it decouples new sources from AC grid, incapacitating a natural frequency response. This situation decreases total system inertia affecting ability to overcome frequency's disturbances. paper evaluates two inertial controller for full-rated converter wind turbines, Type 4: (A) releasing "hidden" and (B) fast reserve emulation. Simulations over test are used...

The large-scale spread of hybrid electric vehicles (HEVs) in the automotive industry is dominated today by continuous variable transmission parallel powertrain as far medium size car are concerned. As a matter fact, tendency this sector to design architectures that they have provided until now higher overall efficiency. However, technological improvements many components and their increased efficiency can reshape vision give new outlines on HEV structure design. This paper aims show...

The increasing penetration of Renewable Energy Sources (RES) and, more in general, converter connected power generation is progressively reducing the overall inertia electricity system introducing new challenges network Frequency Support (FS). Therefore, FS strategies for RES are becoming an important aspect to be developed order ensure secure operation grid. aim present article propose innovative approach inertial emulation Wind Turbine Generators (WTGs) a positive effect on frequency...

This paper proposes a novel methodology for emergency control acting on the mechanical power in grid containing steam generators that experiences contingency. The strategy is based model-predictive (MPC), model-based widely adopted regulation of linear and nonlinear dynamical systems various fields application. MPC applied decentralized formulation, where only local measurements are necessary. performances proposed assessed by means simulations Western Electricity Coordinating Council test...

Gas turbines are raising nowadays growing interest in the power generation industry. Being able to regulate their production faster than any other form of conventional source, they extremely valuable compensating stochastic fluctuations deriving from renewable energy sources large-scale electrical grids, preserving grid stability, etc. In this context, gas turbines' dynamic performance plays a key role and it needs be enhanced (however machine lifetime at same time). Nonlinear model based...

This paper proposes the design of a comprehensive inverter-BESS primary control capable providing satisfactory performances both in grid-connected and islanded configurations as required by international standards grid codes, such IEEE Std. 1547. Such guarantees smooth fast dynamic behavior converter configuration well power voltage-frequency support mode. The proposed are assessed means EMT (ElectroMagnetic Transients) simulations dedicated software DIgSILENT PowerFactory® (Germany,...

During eye rotations the vitreous humour moves with respect to globe. This relative motion has been suggested possibly have an important role in inducing degradation of gel structure, which might lead liquefaction and/or posterior detachment. Aim present work is study characteristics induced by rotations.We use experimental setup, consisting a Perspex model chamber that, for simplicity, taken spherical shape. The filled artificial humour, prepared as solution agar powder and hyaluronic acid...

Inverter based islanded MicroGrids (MGs) are very fascinating but challenging ways to integrate Distributed Energy Resources (DERs) in electric networks. Active and reactive power regulation is a major issue due the necessity of optimally exploiting sources characteristics controlling voltage frequency. Focusing attention on control, main needs regulate at suitable values ensure proper sharing among energy sources. The conventional control for presents relevant drawbacks so an Advanced Droop...

The aim of this paper is to describe the Smart Polygeneration Microgrid (SPM), which going be constructed at Savona Campus Genoa University, also thanks funding from Italian Ministry Education, University and Research. Besides producing renewable high efficiency energy for Campus, SPM will constitute a test-bed facility research, development testing management strategies, devices components smart grid applications. main features infrastructure outlined, pointing out its peculiarities, such...

AbstractThis article proposes an advanced non-linear control algorithm to manage active power and voltage provided by a synchronous generator. The is based on the so-called feedback linearization theory, which relies central concept algebraically transform systems dynamics into fully or partly linear ones, so that techniques can be applied. Starting from basic (electrical, magnetic, mechanical) machine equations, suitable state transformation introduced in order apply block generator model....

Intravitreal drug delivery is a commonly used treatment for several retinal diseases. The objective of this research to characterize and quantify the role vitreous humor motion, induced by saccadic movements, on transport processes in chamber. A Perspex model human chamber was created, filled with purely viscous fluid, representing eyes liquefied or those containing tamponade fluids. Periodic movements were applied resulting three-dimensional (3D) flow fields measured. Drug within...

The aim of the present article is to propose an innovative simplified approach for evaluation active and reactive power losses large photovoltaic plants. This methodology can be then employed in design phase plants order have a preliminary system efficiency capability exchange with electricity operators (TSOs DSOs). necessity strictly related increasing number TSOs DSOs that require provide ancillary services, such as supply participation voltage regulation.