Ioana Fagarasan

Ioana Fagarasan
Polytechnic University of Bucharest | UPB · Department of Automation and Industrial Informatics

About

97
Publications
42,501
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
542
Citations
Citations since 2016
48 Research Items
346 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (97)
Article
Collective actions in the context provided by energy communities and more sobriety from energy users could both represent a potential solution for significantly reducing carbon emissions in residential areas. However, research are needed to properly understand, model and simulate the collective behaviour of communities owning a PV plant with energy...
Article
The recent trends in designing sustainable power systems emphasize the importance of self-consumption (SC) both at individual and community level. This new paradigm changes the way in which we design photovoltaic facilities for residential houses and for various municipality services as well. In this context, the paper aims to formulate several opt...
Article
Full-text available
Future renewable energy communities will reshape the paradigm in which we design and control efficient power systems at the district level. In this manner, the focus will be fundamentally shifted towards sustainable related concepts such as self-consumption, self-sufficiency and net energy exchanged with the grid. In this context, the paper present...
Article
Full-text available
Buildings play a critical role in the stability and resilience of modern smart grids, leading to a refocusing of large-scale energy-management strategies from the supply side to the consumer side. When buildings integrate local renewable-energy generation in the form of renewable-energy resources, they become prosumers, and this adds more complexit...
Conference Paper
Through the future Smart Grid influenced by the challenges brought by distributed and unpredictable generation, limited energy storage infrastructure or shifting consumption patterns, the real-time large-scale system control becomes a necessity. When several energy concepts are translated into simulated processes, it is important to implement and t...
Conference Paper
The paper presents the demand dispatch (DD) concept and applications after a thorough analysis of the main studies in the field. From distribution system operator (DSO)/utility perspective, a main DD classification split was observed: energy price strategies and incentives strategies. On the consumer side, DD methods can be divided into two control...
Preprint
Buildings have started to play a critical role in the stability and resilience of modern smart grids, leading to a refocusing of large scale energy management strategies from the supply side to the consumer side. When the buildings integrate local renewable energy generation in the form of renewable energy resources they become prosumers and this r...
Article
Full-text available
Considering the advances in building monitoring and control through networks of interconnected devices, effective handling of the associated rich data streams is becoming an important challenge. In many situations, the application of conventional system identification or approximate grey-box models, partly theoretic and partly data driven, is eithe...
Preprint
Full-text available
Considering the advances in building monitoring and control through networks of interconnected devices, effective handling of the associated rich data streams is becoming an important challenge. In many situations the application of conventional system identification or approximate grey-box models, partly theoretic and partly data-driven, is either...
Conference Paper
As large scale energy management strategies have gradually shifted the focus from the producer to the consumer side, buildings are starting to play a critical role in the efficient management of the electrical grid. Moreover some buildings have become prosumers by integrating local generation capabilities from renewable sources thus inducing additi...
Conference Paper
The University POLITEHNICA of Bucharest enlarges the range of teaching methodologies by introducing e-learning and teaching using Web technologies. The engineering studies are the most costly direction of education system. The quality of engineering studies is strongly related to used equipments and professional training. To build new laboratories...
Conference Paper
The paper presents the system architecture, development and prototype implementation of a new integrated system for simulation of automated industrial processes using advanced technologies, in accordance with CPS/Industry 4.0 principles. The need to develop such a system is underscored by the interest of the educational stakeholders: students, facu...
Conference Paper
Water management and irrigation scheduling have become the main subjects of different studies in the last decades, due to their high influence on crop performance indicators. This study presents the most important parameters that have to be monitored in an irrigation management system and the most important ones are synthesized: air moisture and te...
Conference Paper
Real-time simulators for training purposes are very useful considering the cost and fault damage reduction comparing to practice on real equipment. Building in house equipments in the universities allows, also, having platforms more appropriated to specifically training needs. Professional training for smart specialization must consider the correla...
Conference Paper
In control engineering both practical and theoretical components of the education are very important for courses as well as laboratory work. The aspects of design and implementation of control need to be integrated in the whole process of learning and training. The paper is presenting a proposal of an architecture of a platform dedicated for resear...
Article
Full-text available
This paper presents the development of a decision support system (DSS) for a low-voltage grid with renewable energy sources (photovoltaic panels and wind turbine) which aims at achieving energy balance in a pilot microgrid with less energy consumed from the network. The DSS is based on a procedural decision algorithm that is applied on a pilot micr...
Article
The built environment, as hallmark of modern society, has become one of the key drivers of energy demand. This makes for meaningful application of novel paradigms, such as cyber-physical systems, with large scale impact for both primary energy consumption reduction as well as (micro-) grid stability problems. In a bottom-up approach we analyze the...
Conference Paper
The presence of a significant proportion of renewable power plants in the Romanian National Power System has led to the need for renewable generation to contribute more significantly to power system voltage and reactive power control. This paper has theoretical and practical contributions on the operation in a complex, interconnected power system t...
Conference Paper
A renewable technology that is gaining more and more credit and registered a fast market development during the last couple of decades is represented by photovoltaic (PV) devices. Being characterized by low energy efficiencies and high investment costs, the main interest is to exploit these equipments as productive as possible. A major problem is t...
Conference Paper
Virtual labs are more and more used and realistic. An effective virtual lab was set up for both on-campus and distance learning teaching. Practice showed that virtual labs have several advantages as reducing the time taken to complete the physical labs, it could be performed during the student's own time but it requires assistance with physical lab...
Conference Paper
Preparing and disseminating knowledge in the field of industrial automation technology for the training of future engineers and researchers poses specific challenges for leveraging cloud-based solutions in an eLearning context. This relates mainly to the need of enabling access to real or simulated hardware and processes besides courseware and hand...
Conference Paper
This paper presents the design and implementation of a control algorithm in order to command the photovoltaic panel movement to improve the availability of solar energy and the system's total efficiency. The designed algorithm is implemented on a solar tracking experimental platform using a model predictive control algorithm. It makes use of measur...
Article
The aim of this work is to compute a level backstepping control strategy for a coupled tanks system. The coupled tanks plant is a component included in the water treatment system of power plants. The nonlinear-model of the process was designed and implemented in Matlab- Simulink. The advantages of the control method proposed is that it takes into c...
Article
The paper carries out a review of the main functional aspects of an electro-energetic system, principles which lead to an evolution or even to a paradigm change the the control of such complex systems. The repositioning of the physical and information systems, mainly through the development of the computing and communication distributed entities, l...
Conference Paper
This paper presents the design and implementation of a fuzzy decision support system for control of photovoltaic panel movement in order to improve the availability of solar energy and the system's total efficiency. The designed algorithm is implemented on a solar tracking experimental platform using a fuzzy logic control strategy. It makes use of...
Conference Paper
Energy storage plays an important role in managing effectively the integration of distributed renewable energy generation within the electrical networks of the future. Pervasive monitoring and control of these systems makes growing use of information and communication technologies, which aim at secure and economic operation at various scales from m...
Article
In ours days data centers provide the global community an indispensable service: nearly unlimited access to almost any kind of information we can imagine by supporting most Internet services such as: Web hosting and E-commerce services. Because of their capacity and their work, data centers have various impacts on the environment, but those related...
Data
Full-text available
The paper presents several improvements to our synthesis platform Xsynth that was developed targeting advanced logic synthesis and technological mapping for k-LUT based FPGAs. Having implemented an efficient exhaustive k-feasible cone generator it was targeted delay optimum mapping and optimal area. Implemented algorithm can use common unit-delay m...
Conference Paper
The prediction of software reliability can determine the current reliability of a product, using statistical techniques based on the failures data, obtained during testing or system usability. The major problem in predicting software reliability is their high complexity, as well as the excessive limitations of existing models. Therefore, choosing t...
Conference Paper
Data centers provide the global community with an indispensable service: nearly unlimited access to almost any kind of information we can imagine. With the increasing demand of information, the high energy costs has raised the issue of power consumption. The main goal in achieving data center energy efficiency can be translated into the ensuring th...
Conference Paper
The prediction of software reliability can determine the current reliability of a product, using statistical techniques based on the failures data, obtained during testing or system usability. Software reliability growth models attempt to predict the number of defect using a correlation between exponential function and defect data. The purpose of t...
Conference Paper
This paper presents a case study on a practical implementation of a fuzzy-PLC system for a servomechanism. The method presented achieves smooth fuzzy control, that can be easily implemented in a PLC system. The speed of the servomechanism is controlled.
Conference Paper
The simulation and the optimisation of some industrial processes represents a modern and efficient direction for multifunctional testing platforms. These platforms are designed for complex developments of technologic scenarios in order to improve and implement the control schemes with the help of modern technologies. The cost and the amount of time...
Conference Paper
This paper focuses on load frequency regulation, as a major function of automatic generation control (AGC) in the context of a versatile power system structure, environmental constrains and emerging new uncertainties. Generation units models are determined in order to build a control diagram used for load dispatch. The optimal parameters for the se...
Article
Full-text available
The simulation of physical processes represents a modern and efficient direction for multifunctional testing plat-forms. This paper will present a Process Control Simulator and its applications in system simulation. The Process Control Simulator can be used for students training as well as for the conception, simulation and improvement of control s...
Article
Full-text available
The implementation and the achievement of a Process Simulator can replace a vast number of expensive system or function models. The simulation and automation of physical processes reduce the costs and the amount of time needed for deployment. The designed system can be used to simulate, project and train the programming of programmable logical cont...
Article
This paper presents aspects regarding Load Frequency Control (LFC) in the Romanian Power System, which, considering its characteristics, is a large system. Load Frequency Control keeps the balance of the power generation and consumption in a control area in order to maintain an acceptable system frequency. Time models for hydro and thermal generati...
Conference Paper
Full-text available
Physical faults include bridging fault, break (open) fault, transistor stuck-on and transistor stuck-off Compared to traditional gate-level stuck-at faults, physical faults more closely represent realistic faults appearing at the gate level and switch level. Analytical modeling for such faults, used for design and testability, is still a new and em...
Article
Full-text available
A Modular Process Simulator can replace a vast number of expensive systems or function models used to simulate, to project and to train the programming of programmable logical controller (PLC) systems, graphically and practically. The simulation of physical processes reduces the costs and the amount of time needed for deploying the system. Differen...
Conference Paper
Underlining first the principle of Load Frequency Control (LFC) according to the UCTE regulations this paper also presents simple continuous time models identified for the main hydro and thermal power generation units used by the LFC in Romanian Power System. Different models were proposed in previous articles but they are very complex for LFC stud...
Article
Full-text available
A modular system for processes simulator and control diagram implementation can replace a vast number of expensive systems used to simulate, to design and to test the programming of programmable logical control (PLC) systems graphically and practically. Different processes are simulated and associated with different types of control application and...
Chapter
Full-text available
Wind Power Plants (WPP) is the fastest growing energy sector. WPP consisting from a single turbine to as many as several hundred turbines. The acceptance of wind-generated power by the financial and developer communities from Romania as a viable enterprise is influenced by the risk associated with the capital equipment reliability. Increased risk...
Article
Full-text available
Considering the need for greenhouse gas emissions reduction, the power system is facing the additional variability and uncertainty introduced by the generation of renewable energy. Wind farms are important power generation units that produce "clean" energy and induce disturbances to the power system according to the fluctuating nature of the wind t...