Modified PDPWM control with MPPT algorithm for equal power sharing in cascaded multilevel inverter for standalone PV system under partial shading

In this paper, a modified particle swarm optimization (MPSO) based maximum power point tracking (MPPT) controller is used to track the maximum power of a PV system using DC-DC boost converter technology. To raise the PV module's input DC voltage, a DC-DC boost converter was employed. The boost converter powered the DC-AC multilevel PWM inverter, which then delivered the output AC voltage to a solitary inductive load. Cascaded multilevel inverters are often used to condition power in renewable energy applications because they are easy to use and have few parts. Ripples in the voltage of DC link capacitors cause low order harmonics and inter harmonics in the multilevel inverter's output voltage. Phase disposition pulse width modulation (PDPWM) has the fewest harmonics. The inverter cells' power delivery is not equal in this manner. In the present paper, a strategy for improving sharing of power PDPWM for photovoltaic applications is proposed. The modified PDPWM is used on a 9-level inverter where each cell is connected to a PV array running at maximum power point tracking MPPT and under partial shadowing for single phase multilevel inverters. The MATLAB/SIMULINK software was used to do simulations, and the findings demonstrate that the method presented is effective at balancing the way power is shared between different inverter cells and reducing the voltage ripple of the DC link capacitor

Modeling and simulation of building energy consumption

Building energy consumption represents much of the total energy consumed in advanced countries. For this reason, the aim of this paper is to study the energy consumption profile by day for each domestic appliance: controllable appliances (heating, ventilation and air conditioning, electric water heater, dishwasher, washing machine) and non-controllable appliances (oven, TV, PC, iron, refrigerator and freezer) where the modeling and the simulation based on MATLAB/Simulink software are presented

Investigation of dynamic behavior and process stability at turning of thin-walled tubular workpieces made of 42CrMo4 steel alloy

During machining, the surface of the machined materials is damaged and tool wear occurs, sometimes even to complete failure. Machining of thin-walled parts is generally cumbersome due to their low structural rigidity. The study deals with the effect of the feed rate and the thickness of the thin-walled part on the dynamic behavior and stability of the turning process during the roughing and finishing of thin-walled tubular workpieces made of steel alloy 42CrMo4. At the same time, the cutting forces and deformations of the workpiece were also evaluated via numerical and experimental approaches. The numerical study is based on a three-dimensional (3D) finite element model (FEM) developed using the ABAQUS/Explicit frame. In the model, the workpiece material is governed by the behavior law of Johnson–Cook. Numerical and experimental results show that the cutting forces and the quality of the machined surface depend not only on the choice of cutting parameters but also on the dynamic behavior of thin-walled parts due to their low rigidity and low structural damping during the machining operation. Cutting forces are proportional to the feed rate and inversely proportional to the thickness of the part. Their variations around the average values are low for roughing tests where the wall-part thickness is higher or equal to 3.5 mm. However, these variations intensify for finishing tests where the wall thickness is less or equal to 1.5 mm. Indeed, the recorded FFT spectra for a finishing operation show several harmonics that occurred at around 550 Hz, and the amplitude of the peaks, which describes the level of power contained in the signals, shows an increase similar to that of the amplitudes of the temporal signal. The flexibility of the part generates instability in the cutting process, but the frequencies of the vibrations are higher than the frequency of rotation of the part.Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky, (APVV-19-0550); Ministry of Higher Education and Scientific Research, Republic of Sudan, MHESRMinistry of Higher Education and Scientific Research of the Tunisia Republic; Ministry of Education, Science, Research, and Sport of the Slovak Republic [APVV-19-0550

Modified PDPWM control with MPPT algorithm for equal power sharing in cascaded multilevel inverter for standalone PV system under partial shading

&lt;span lang="EN-US"&gt;In this paper, a modified particle swarm optimization (MPSO) based maximum power point tracking (MPPT) controller is used to track the maximum power of a PV system using DC-DC boost converter technology. &lt;/span&gt;&lt;span lang="EN-GB"&gt;To raise the PV module's input DC voltage, a DC-DC boost converter was employed. The boost converter powered the DC-AC multilevel PWM inverter, which then delivered the output AC voltage to a solitary inductive load. Cascaded multilevel inverters are often used to condition power in renewable energy applications because they are easy to use and have few parts. Ripples in the voltage of DC link capacitors cause low order harmonics and inter harmonics in the multilevel inverter's output voltage. Phase disposition pulse width modulation (PDPWM) has the fewest harmonics. The inverter cells' power delivery is not equal in this manner. In the present paper, a strategy for improving sharing of power PDPWM for photovoltaic applications is proposed. The modified PDPWM is used on a 9-level inverter where each cell is connected to a PV array running at maximum power point tracking MPPT and under partial shadowing for single phase multilevel inverters. The MATLAB/SIMULINK software was used to do simulations, and the findings demonstrate that the method presented is effective at balancing the way power is shared between different inverter cells and reducing the voltage ripple of the DC link capacitor.&lt;/span&gt;</jats:p

Digitalization in the context of electricity market reforms and liberalization; Overview of opportunities and threats

Digitalisation enabled by advances in technology has an enormous potential to create value for electricity market reforms by helping promote competition, security of supply, and sustainability. It contributes to the growth of the electricity sector and changes the electricity market and the way consumers can engage in it. However, besides the opportunities emerging with digitalisation, the threats of emerging digital technologies are increasing. While digitalisation can bring many positive benefits, it can also make electricity systems more vulnerable to cyberattacks. This chapter investigates digitalisation in electricity market reforms and liberalisation worldwide, specifically in ASEAN. It also discusses the potential opportunities and threats of digitalisation for electricity market reforms.</p

CONTRIBUTION A LA CONCEPTION ET L'OPTIMISATION D'UN SYSTEME D'AIDE A LA GESTION DES URGENCES

Emergency management is one of the principal hospital missions. Since the 90s, hospitals have answered, through the emergency structure, an exponential request for not programmed care, which posed the problem of the dimensioning of the structure and its means. This situation provoked enormous organisational problems. In front of this situation, the hospital decision-makers miss tools witch are indispensable to re-size the emergency resources and to choose the new emergency organization. They shall also allow the planning of the emergency management as well as human and material resources allocation. In response to these needs, this thesis proposes an approach of assistance to the management of emergency systems. This approach tackles three principal problems. At first, we focus our attention on the modelling of emergency processes and its main paths. This modelling, coupled with patients flow simulation, will enable us to analyze the functioning of the emergency structure and to determine the parameters which influences the emergency process. We are interested, secondly, in the nursing staff's allocation by taking into account their profile of competence evolution using the linear programming. In the third time, we shall study the problem of in hospital vital emergencies management. By means of a process modelling combined with a simulation, we proceed to an approach of conception and evaluation of in hospital survival chain. We tackle, in this last stage, the question of appointment of mobile resuscitation emergency team as well as the positioning of semi automatic defibrillator.La prise en charge des urgences est l'une des missions principales des établissements de santé. Ces derniers, au travers de la structure d'urgence, ont du depuis les années 90, répondre à une demande exponentielle de soins non programmés, ce qui a posé le problème du dimensionnement de la structure et de ses moyens. Cette situation a provoqué des problèmes organisationels énormes. Face à cette situation, les décideurs hospitaliers manquent d'outils qui sont indispensables pour redimensionner les ressources humaines et matérielles et pour planifier la prise en charge des urgences. En réponse à ces besoins, cette thèse propose une démarche d'aide à la gestion des systèmes de prise en charge des urgences. Cette démarche aborde trois principaux problèmes. Dans un premier temps, nous nous focalisons sur la modélisation des processus de prise en charge des urgences et ses principales filières. Cette modélisation, couplée à la simulation de flux, nous permettra d'analyser le fonctionnement de la structure et de déterminer les paramètres influents la prise en charge des urgences. Nous nous intéressons, dans un second temps, à l'affectation des personnels infirmiers en tenant compte de leur profil de compétence à l'aide de la programmation linéaire. Enfin, nous étudierons le problème de prise en charge des urgences vitales intrahospitalières. A l'aide d'une modélisation réunie avec une simulation, nous procédons à une démarche de conception et d'évaluation de la chaine de survie intrahospitalière. Nous abordons, dans cette dernière étape, la question de d'affectation de l'équipe mobile de réanimation d'urgence ainsi que le positionnement des défibrillateurs semi automatiques

CONTRIBUTION A LA CONCEPTION ET L'OPTIMISATION D'UN SYSTEME D'AIDE A LA GESTION DES URGENCES

Emergency management is one of the principal hospital missions. Since the 90s, hospitals have answered, through the emergency structure, an exponential request for not programmed care, which posed the problem of the dimensioning of the structure and its means. This situation provoked enormous organisational problems. In front of this situation, the hospital decision-makers miss tools witch are indispensable to re-size the emergency resources and to choose the new emergency organization. They shall also allow the planning of the emergency management as well as human and material resources allocation. In response to these needs, this thesis proposes an approach of assistance to the management of emergency systems. This approach tackles three principal problems. At first, we focus our attention on the modelling of emergency processes and its main paths. This modelling, coupled with patients flow simulation, will enable us to analyze the functioning of the emergency structure and to determine the parameters which influences the emergency process. We are interested, secondly, in the nursing staff's allocation by taking into account their profile of competence evolution using the linear programming. In the third time, we shall study the problem of in hospital vital emergencies management. By means of a process modelling combined with a simulation, we proceed to an approach of conception and evaluation of in hospital survival chain. We tackle, in this last stage, the question of appointment of mobile resuscitation emergency team as well as the positioning of semi automatic defibrillator.La prise en charge des urgences est l'une des missions principales des établissements de santé. Ces derniers, au travers de la structure d'urgence, ont du depuis les années 90, répondre à une demande exponentielle de soins non programmés, ce qui a posé le problème du dimensionnement de la structure et de ses moyens. Cette situation a provoqué des problèmes organisationels énormes. Face à cette situation, les décideurs hospitaliers manquent d'outils qui sont indispensables pour redimensionner les ressources humaines et matérielles et pour planifier la prise en charge des urgences. En réponse à ces besoins, cette thèse propose une démarche d'aide à la gestion des systèmes de prise en charge des urgences. Cette démarche aborde trois principaux problèmes. Dans un premier temps, nous nous focalisons sur la modélisation des processus de prise en charge des urgences et ses principales filières. Cette modélisation, couplée à la simulation de flux, nous permettra d'analyser le fonctionnement de la structure et de déterminer les paramètres influents la prise en charge des urgences. Nous nous intéressons, dans un second temps, à l'affectation des personnels infirmiers en tenant compte de leur profil de compétence à l'aide de la programmation linéaire. Enfin, nous étudierons le problème de prise en charge des urgences vitales intrahospitalières. A l'aide d'une modélisation réunie avec une simulation, nous procédons à une démarche de conception et d'évaluation de la chaine de survie intrahospitalière. Nous abordons, dans cette dernière étape, la question de d'affectation de l'équipe mobile de réanimation d'urgence ainsi que le positionnement des défibrillateurs semi automatiques

Public Intermediaries as KeyFacilitators of Diffusion : The Case of Renewable Energy in Sweden

Diusion of renewable energy technologies(RETs) is an important challengeof the current century. Much of the existing research has put a focus on understandingthe diusion of RETs through the perspective of systems of innovation. However, two recent studies highlight the importance of the actors in the process- those who adopt the RETs. With the current study we continue thisactor perspective by focusing on the adoption process as the driver of the massdiusion. We bring together the two streams of diusion of innovation and innovationintermediaries in a thesis that aims to show how comprehending thesingle adoption process and providing support to the adopters at every singlephase of it can facilitate diusion. Our focus is fully on public intermediaries. We show that public innovationintermediaries known in research for their support for the innovation systemhave an unexplored facet i.e. that of supporters at the adopter level. The thesiscontributes to previous literature showing that public intermediaries are thesupporters of adopters of RETs at the very beginning of the process which wascurrently unexplored. Moreover, we demonstrate that public intermediaries arepresent in the later phases of the adoption process as well being their impartialitya main advantage in comparison to private intermediaries. The study revealstwo key roles of public intermediaries in the pre-adoption phase of the processand four roles in the implementation phase. To complete the research we use qualitative methods and particularly groundedtheory methodology for data collection and analysis. Data is collected throughface-to-face long interviews with six public and/or non-prot intermediaries locatedin the Swedish county, Ostergotland. The study brings about the recognitionof public intermediaries as direct supporters of adopters of RETs in practice,oers ways of rethinking the existing policies in order to speed up diusion ofRETs and expands the arena for further research with focus on the interactionbetween intermediaries and adopters