Cristian Dragoş Dumitru

"George Emil Palade" University of Medicine, Pharmacy, Sciences and Technology of Targu Mures · Electrical Engineering and Information Technology

This paper examines methodologies for monitoring energy consumption and operational parameters of an industrial assembly line, with a particular emphasis on the utilization of virtual tools, augmented reality, and real-time data visualization. The research examines the integration of an interface and the implementation of a data acquisition system,...

The management of electric car batteries has taken front stage in automotive research and development as more people choose electric vehicles (EVs). Optimal performance, safety, and lifetime of electric vehicles depend on effective battery management systems (BMS). To address this, we developed software for system functionality testing and a BMS pr...

Smart metering systems development and implementation in power distribution networks can be seen as an important factor that led to a major technological upgrade and one of the first steps in the transition to smart grids. Besides their main function of power consumption metering, as is demonstrated in this work, the extended implementation of smar...

In industrial halls where compressed air is used for series production, pneumatic equipment requires reliability challenges and extending the duration of operation. However there are major deviations from their mode of operation that require the application of new appropriate methods of tracking them. The objectives of this research are the selecti...

The aim of the paper is to investigate the opportunity of implementing and optimizing an electricity production structure from renewable sources that can be integrated into a university campus building consisting of photovoltaic solar panels, respectively their management using deep learning techniques, in particular long short-term memory (LSTM) n...

Many evolutions in current areas of daily life depend on major events occurrence. A more sensitive domain, due its cascade effects on other interconnected fields, is represented by the electricity sector. The analysis of the major COVID-19 influence on the electricity usage and its repercussion on related economic domains is highlighted in this pap...

The proper power distribution systems operation is conditioned by its response to the consumers’ energy demand. This is achieved by using predictable power sources supplemented by ancillary services. With the penetration of different alternative power sources especially the renewable ones, the grid increasingly becomes an active distribution networ...

One of the keys of enhancing the quality of electric power supply resides in the accuracy of the consumption metering. Nowadays development of the sensors, devices and systems for electricity metering offers the basis for this service. Nevertheless, this achievement in many situations is altered such that appropriate measures must be adopted even i...

Modern and larger horizontal-axis wind turbines with power capacity reaching 15 MW and rotors of more than 235-meter diameter are under continuous development for the merit of minimizing the unit cost of energy production ($/Kw.hrs). In this context, the European Wind Energy Association has set a target of installed capacity of 150 GW by 2030, whic...

The aim of the paper is to investigate and develop of a method for reducing the own technological consumption in distribution networks involving the power demand forecast. In order to solve the mentioned main objective it is proposed an optimization model that is built on the main characteristics of a medium and low voltage power distribution netwo...

This paper proposes an AAR system implemented on a power station with 2 bus bar systems that provide a minimal risk of error in maneuvers operated by exploitation personnel. The proposed AAR system is implemented on a power station equipped with two power transformers and two bus bar systems connected by a coupler circuit breaker.

The scope of this work is to analyze different time series modeling methods, reported in literature, for forecasting production of electrical energy from renewable energy sources such as wind energy. Two different models are considered: a stochastic model (ARIMA) and a model based on neural networks (FFANN or MLP). The studied time series represent...

The aim of the paper is to investigate the possibility of using artificial intelligence in photovoltaic energy production forecasting. The presented approach is conceived as a module of energy management and production planning of a photovoltaic power plant located in central part of Romania. The main goal of the research is to develop a solution t...

Efficient use of electricity could be a way by which significant savings can be achieved. One of the most important is represented by the improvement of the power supply quality through power factor correction to optimal values. This paper aims to present an implementation of a solution for power factor correction in the distribution networks of co...

This paper presents a proposal related to the wind power forecasting using artificial neural networks. An architecture based on feedforward artificial neural network is developed. The proposed solution is investigated in order to establish the optimum configuration and the performances in case of the South-East part of the Europe conditions. Conclu...

This paper explores the context of remote monitoring of parameters acquired through SCADA (Supervisory Control and Data Acquisition) systems, with particular focus on parameters that change infrequently (temperature, light levels, humidity, etc.). We aim to design a simple and cost-effective framework that allows a DAS (Data Acquisition System) wit...

The present paper deals with energy-efficient street lighting using LED technology. Depending on the voltage applied the LED luminous flux may vary. To ensure an efficient street lighting it is necessary to implement an on / off street lighting system schedule according to the geographical location by taking as a reference the times when the sun ri...

Power quality evaluation involves measurements and determinations of some power quality indicators. One of these indicators is represented by the power factor. The importance of the power factor as an indicator of power quality, both theoretical and practical, implies its determination or direct measurement as a necessity, especially in industrial...

We formulate two Intrusion Detection System (IDS) design problems for Smart Grids. The first one optimally places IDS devices on communication paths, while the second one addresses the resilient communications requirement and enhances the first problem with the provisioning of K distinct back-up paths and additional IDS devices. The developed probl...

The present paper deals with the simulation of a solar photovoltaic MPPT controller used for the supply of a power consumer. The power system contains a photovoltaic generator, MPPT controllers, batteries, power consumers and the connection to a local grid. The solar photovoltaic MPPT controller is implemented by using the “perturb and observe” (P&...

The management of renewable energy resources plays an important role in the availability, stability and energy quality in the modern power systems. A key role of the energy management policies is played by the primary resource availability adjustment to the required consumption. As the renewable energy resources are variable in time their forecast...

This paper presents the design and technical-economic analysis of a solar power system for a residential consumer. One of the main objectives is to design an optimal power system based on solar energy resources for a chosen power consumer. The power consumer represents the starting point of the analysis, contains both AC and DC users and, before th...

This paper presents the approach and study of an intelligent electrical consumer, in the analyzed case a road lighting system, powered by renewable energy sources, to achieve energy efficiency. The consumer is equipped with sensors, controlled by a microcontroller unit and can autonomously working. If one of the main objectives is to achieve a bett...

The paper presents the steps and the algorithm used to create a software for designing a solar photovoltaic application by using a programming environment in an accessible way, which provides after some calculations of all the checking required an accurate information regarding the number of series and parallel solar photovoltaic panels, currents a...

This paper presents the monitoring and control processes as an important part of a renewable energy management system. The main purpose of the work is to build a management system for a commercial consumer (hydroponic greenhouse) that uses solar and biomass energy and to present the monitoring and control processes of this system. The proposed meth...

The paper presents an approach and a study of hydroponic greenhouses energy supply based on renewable energy sources and independent from the national electric power grid and from the conventional gas heating system. The study presents the hydroponic greenhouse main elements, the technological process, proposed solutions based on renewable energy s...

The present paper proposes and analyzes the methodology and the adequate educational solution for training students following a form of technical education in general or a particular specialization in the field of electrical engineering. The structure of the theoretical and practical training material are considered to achieve this goal.

The paper presents software and hardware developments for power systems based on renewable energy and their management system. The main purpose is to present the advantage of combined technologies, different solutions for control, communication and data monitoring systems, all of this implemented to develop an efficient energy management system bas...

A multitude of factors, from the technological ones to the availability of primary resources and not least the current trend of electricity production at small capacities, led to a significant development of distributed generation. The problems they bring requires a special attention provided by supervisory control and data acquisition (SCADA) solu...

The present paper represents a part of a research study performed by authors in the field of energy management systems based on independent or connected to public supply network renewable energy systems. The main objective deals with the design and implementation of such management system so as to facilitate decision-making role in providing manage...

The paper presents the modeling of a solar-wind-hydroelectric hybrid system in Matlab/Simulink environment. The application is useful for analysis and simulation of a real hybrid solar-wind-hydroelectric system connected to a public grid. Application is built on modular architecture to facilitate easy study of each component module influence. Block...

The goal of this paper is to describe the development of an extension, such as markup language based on XML standard, called VIML-Virtual Instruments Markup Language. Therefore, author proposes to extend the XML standard for use in the field of virtual instrumentation. The paper intends to present a framework for generating and managing virtual ins...

This paper presents an architecture and design of a solution for virtual instrumentation in SCADA systems. The aim of this approach is to propose a way to design virtual instrumentation based on software components, which ensures uniform, consistent and extensible access to the functions of the SCADA hardware components. Based on the proposed solut...

Nowadays, the electric lighting is an important part of our lives and also represents a significant part of the electric power consumption. Alternative solutions such as renewable energy applied in this domain are thus welcomed. This paper presents a workstation conceived for the study of photovoltaic solar energy for lighting systems by students o...

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Recent developments and trends in the electric power consumption indicate an increasing use of renewable energy. Renewable energy technologies offer the promise of clean, abundant energy gathered from self-renewing resources such as the sun, wind, earth and plants. Virtually all regions of the world have renewable resources of one type or another....

Solar energy is one of the renewable energies on which nowadays scientists interested in energy sources are focused. A problem that appears is their output which is intermittent and therefore storage, careful control and parameter monitoring are required. This paper presents a workstation conceived for the study of photovoltaic solar energy. Beside...

Renewable energy technologies offer the promise of clean, abundant energy gathered from self-renewing resources such as the sun, wind, earth, and plants. Virtually all regions of the world have renewable resources of one type or another. This paper deals with the identifying, analysis and modeling of a system supplied with energy provided by renewa...

The promotion of energy production from renewable resources represents an imperative objective in present times justified by environmental issues, the increase of energetic independence by avoiding imports, supplying a diversity of sources and of course economical and social cohesion reasons. Management and supervising schemes for the systems based...

This paper deals with the analysis, modelling, control and development of electrical local networks supplied with energy provided by renewable resources. Different types of local DC and AC networks are investigated but also the management and use of produced energy in those networks. Another important analysis is the penetration of DC consumers in...