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Prof. Radu Porumb
Department of Electric Power Systems, University Politehnica of Bucharest, 060042 Bucharest, Romania

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0 Distributed Generation
0 Education
0 Energy Efficiency
0 Power Quality
0 Renewable Energy

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Power Quality
Smart Grid
Distributed Generation
Renewable Energy
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Energy Storage Systems

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Review
Published: 01 May 2021 in Energies
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With the increase in the electrical load and the progressive introduction of power generation from intermittent renewable energy sources, the power line operating conditions are approaching the thermal limits. The definition of thermal limits variable in time has been addressed under the concept of dynamic thermal rating (DTR), with which it is possible to provide a more detailed assessment of the line rating and exploit the electrical system more flexibly. Most of the literature on DTR has addressed overhead lines exposed to different weather conditions. The interest in the dynamic thermal rating of power cables is increasing, considering the evolution of computational methods and advanced systems for cable monitoring. This paper contains an overview of the concepts and methods referring to dynamic cable rating (DCR). Starting from the analytical formulations developed many years ago for determining the power cable rating in steady-state conditions, also reported in International Standards, this paper considers the improvements of these formulations proposed during the years. These improvements are leading to include more specific details in the models used for DCR analysis and the computational methods used to assess the power cable’s thermal conditions buried in soil. This paper is focused on highlighting the path from the initial theories and models to the latest literature contributions. Attention is paid to thermal modelling with different levels of detail, applications of 2D and 3D solvers and simplified models, and their validation based on experimental measurements. A salient point of the overview is considering the DCR impact on reliability aspects, risk estimation, real-time calculations, forecasting, and planning with different time horizons.

ACS Style

Diana Enescu; Pietro Colella; Angela Russo; Radu Porumb; George Seritan. Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables. Energies 2021, 14, 2591 .

AMA Style

Diana Enescu, Pietro Colella, Angela Russo, Radu Porumb, George Seritan. Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables. Energies. 2021; 14 (9):2591.

Chicago/Turabian Style

Diana Enescu; Pietro Colella; Angela Russo; Radu Porumb; George Seritan. 2021. "Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables." Energies 14, no. 9: 2591.

Journal article
Published: 04 September 2020 in Energy Reports
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With the exception of Albania, the countries of South-Eastern Europe (SEE) have high shares of electricity generation from an ageing fleet of coal-fired power units with quite low efficiencies. Energy planning-related decision-making regarding whether to modernize or replace a significant share of this old generating capacity has to be fixed within a global clean energy transition context. At the same time, the SEE region has a huge potential for renewable energy deployment and energy efficiency implementation. This work presents a generic mixed integer linear programming model to determine the optimal energy scheduling of a multi-zonal power system following the roadmaps of its energy transition process. Through a detailed unit commitment model implementing a co-optimization of energy and reserves market with a cost minimization objective function, the developed approach determines the optimal annual energy mixes of the Romanian power system through the day by day iterative solution of all the dates of three specific time milestones (2020, 2030, and 2040), where the outputs of a specific date comprise the inputs of the next one. The model outputs highlight the impacts on the power system in terms of technical, economic, and environmental performance. The energy transition towards a renewables dominant capacity and production mix guarantees the system’s security of supply, and improves noticeably its environmental performance, reporting a significant decrease in the amount of resulting CO2 emissions. With regard to the economic impacts, the wholesale price follows an increasing trend due to the parallel increase of the CO2 emission pricing, on the grounds that natural gas-fired units and electricity interconnections set the system’s price during most of the hours of all dates and years. The developed optimization framework enables the provision of useful insights on the determination of the optimal energy roadmaps, by highlighting the influences and the challenges of each phase.

ACS Style

Nikolaos E. Koltsaklis; Athanasios S. Dagoumas; George Seritan; Radu Porumb. Energy transition in the South East Europe: The case of the Romanian power system. Energy Reports 2020, 6, 2376 -2393.

AMA Style

Nikolaos E. Koltsaklis, Athanasios S. Dagoumas, George Seritan, Radu Porumb. Energy transition in the South East Europe: The case of the Romanian power system. Energy Reports. 2020; 6 ():2376-2393.

Chicago/Turabian Style

Nikolaos E. Koltsaklis; Athanasios S. Dagoumas; George Seritan; Radu Porumb. 2020. "Energy transition in the South East Europe: The case of the Romanian power system." Energy Reports 6, no. : 2376-2393.

Review
Published: 10 January 2020 in Energies
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Thermal energy systems (TES) contribute to the on-going process that leads to higher integration among different energy systems, with the aim of reaching a cleaner, more flexible and sustainable use of the energy resources. This paper reviews the current literature that refers to the development and exploitation of TES-based solutions in systems connected to the electrical grid. These solutions facilitate the energy system integration to get additional flexibility for energy management, enable better use of variable renewable energy sources (RES), and contribute to the modernisation of the energy system infrastructures, the enhancement of the grid operation practices that include energy shifting, and the provision of cost-effective grid services. This paper offers a complementary view with respect to other reviews that deal with energy storage technologies, materials for TES applications, TES for buildings, and contributions of electrical energy storage for grid applications. The main aspects addressed are the characteristics, parameters and models of the TES systems, the deployment of TES in systems with variable RES, microgrids, and multi-energy networks, and the emerging trends for TES applications.

ACS Style

Diana Enescu; Gianfranco Chicco; Radu Porumb; George Seritan. Thermal Energy Storage for Grid Applications: Current Status and Emerging Trends. Energies 2020, 13, 340 .

AMA Style

Diana Enescu, Gianfranco Chicco, Radu Porumb, George Seritan. Thermal Energy Storage for Grid Applications: Current Status and Emerging Trends. Energies. 2020; 13 (2):340.

Chicago/Turabian Style

Diana Enescu; Gianfranco Chicco; Radu Porumb; George Seritan. 2020. "Thermal Energy Storage for Grid Applications: Current Status and Emerging Trends." Energies 13, no. 2: 340.

Book chapter
Published: 20 February 2019 in Green Energy Advances
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The current transition of electrical power systems toward smart grids is encompassing a fundamental change in their structure, as well as operation. This is setting the path to be followed by the hardware and software embedded in electrical power systems, as well as technology adaptation to the “open-source” customers’ needs and consumption patterns. This chapter is following the evolution of energy sector, accompanied by constant improvements of technology, which is providing increasingly complex hardware, which embeds power quality improvement devices, for an efficient operation of electrical power assets. This chapter presents a comprehensive survey of continuous advances of renewable energy sources and storage technology which have started the transformation of end users into energy-efficient and clean prosumers, underlining the subsequent energy markets support of peer-to-peer energy trading through novel technologies as blockchain.

ACS Style

Radu Porumb; George Serițan. Integration of Advanced Technologies for Efficient Operation of Smart Grids. Green Energy Advances 2019, 1 .

AMA Style

Radu Porumb, George Serițan. Integration of Advanced Technologies for Efficient Operation of Smart Grids. Green Energy Advances. 2019; ():1.

Chicago/Turabian Style

Radu Porumb; George Serițan. 2019. "Integration of Advanced Technologies for Efficient Operation of Smart Grids." Green Energy Advances , no. : 1.

Journal article
Published: 14 September 2017 in IEEE Transactions on Industry Applications
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In this paper, the notion of reliability assessment for distribution system applications is revisited to include a number of practices emerging in the smart grid context. The information on the variations in time of generation and demand is taken into account to establish a reference network configuration that considers the definition of an intraday reconfiguration strategy based on conventional load profiles for different categories of demand (residential, industrial, and commercial). After a fault, the service restoration process is aided by the formation of autonomous islanded subsystems (microgrids). During the restoration period, each subsystem is able to serve the local demand in a given portion of the network and to reconnect to the main network through proper synchronization. Dedicated solutions for mobile generation and storage are exploited to reach the nodes needing additional supply. A sequential Monte Carlo method is used to carry out reliability assessment. The use of this method incorporates the effects of interfering near-coincident faults and time-varying load and local generation patterns. The application on a real distribution network is presented, showing the probability distributions of the reliability indicators (power and energy not supplied), as well as the breakdown of these indicators for different demand categories.

ACS Style

Pilar Meneses De Quevedo; Javier Contreras; Andrea Mazza; Gianfranco Chicco; Radu Porumb. Reliability Assessment of Microgrids With Local and Mobile Generation, Time-Dependent Profiles, and Intraday Reconfiguration. IEEE Transactions on Industry Applications 2017, 54, 61 -72.

AMA Style

Pilar Meneses De Quevedo, Javier Contreras, Andrea Mazza, Gianfranco Chicco, Radu Porumb. Reliability Assessment of Microgrids With Local and Mobile Generation, Time-Dependent Profiles, and Intraday Reconfiguration. IEEE Transactions on Industry Applications. 2017; 54 (1):61-72.

Chicago/Turabian Style

Pilar Meneses De Quevedo; Javier Contreras; Andrea Mazza; Gianfranco Chicco; Radu Porumb. 2017. "Reliability Assessment of Microgrids With Local and Mobile Generation, Time-Dependent Profiles, and Intraday Reconfiguration." IEEE Transactions on Industry Applications 54, no. 1: 61-72.

Journal article
Published: 01 June 2017 in Electric Power Systems Research
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This paper deals with the identification of balance, unbalance and distortion components in unbalanced three-phase systems with distorted waveforms containing harmonics and interharmonics. The analysis starts from the harmonic distortion and unbalance components found through the symmetrical component-based (SCB) approach previously defined by the authors. The SCB approach is extended in this paper by introducing an auxiliary reference frequency and identifying its consistency condition with respect to the fundamental system frequency. After defining the auxiliary reference frequency, the proposed approach directly uses the classical symmetrical component transformation matrix at any harmonic or interharmonic. Various results are presented, for conventional test cases and for measurements gathered from real systems with variable unbalanced and distorted loads. These results show that the extended SCB approach is particularly useful to analyze three-phase systems in unbalanced and distorted conditions with harmonics and interharmonics, because of its simplicity and intuitiveness compared to other approaches.

ACS Style

Gianfranco Chicco; Enrico Pons; Angela Russo; Filippo Spertino; Radu Porumb; Petru Postolache; Cornel Toader. Assessment of unbalance and distortion components in three-phase systems with harmonics and interharmonics. Electric Power Systems Research 2017, 147, 201 -212.

AMA Style

Gianfranco Chicco, Enrico Pons, Angela Russo, Filippo Spertino, Radu Porumb, Petru Postolache, Cornel Toader. Assessment of unbalance and distortion components in three-phase systems with harmonics and interharmonics. Electric Power Systems Research. 2017; 147 ():201-212.

Chicago/Turabian Style

Gianfranco Chicco; Enrico Pons; Angela Russo; Filippo Spertino; Radu Porumb; Petru Postolache; Cornel Toader. 2017. "Assessment of unbalance and distortion components in three-phase systems with harmonics and interharmonics." Electric Power Systems Research 147, no. : 201-212.

Proceedings article
Published: 01 January 2017 in 2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
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This paper concentrated on identifying the main issues raised by the adoption of new PV generation and e-cars storage technologies, and their influence on power quality parameters. The main difficulty of this paper was to create a simulation tool which replicates the actual consumption behavior of UPB electric network, and to project scenarios for PV generation and e-cars capacities. A main point in the analysis performed in this work is the characterization of the electric loads present in the upcoming smart grid. An intimate view of a PV system implemented into UPB electric distribution system was delivered, along with its operation mode and its influence on power quality. The full picture was achieved by proposing a reactive energy compensator, which proved to have significant influence in increasing the harmonic distortion indexes and increasing the possible damage hazard for the sensible electronic devices.

ACS Style

Radu Porumb; Stefan Gheorghe; George Darie; Tudor Boboc. Analysis of power quality issues raised by PV generation and e-parking storage capacities in UPB smart grid environment. 2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE) 2017, 802 -807.

AMA Style

Radu Porumb, Stefan Gheorghe, George Darie, Tudor Boboc. Analysis of power quality issues raised by PV generation and e-parking storage capacities in UPB smart grid environment. 2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE). 2017; ():802-807.

Chicago/Turabian Style

Radu Porumb; Stefan Gheorghe; George Darie; Tudor Boboc. 2017. "Analysis of power quality issues raised by PV generation and e-parking storage capacities in UPB smart grid environment." 2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE) , no. : 802-807.

Conference paper
Published: 12 December 2016 in 2016 International Conference and Exposition on Electrical and Power Engineering (EPE)
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This paper addresses the issue of information management and knowledge-based decisions which are paramount for an efficient operation of smart grids. The ever-growing presence of new technologies, which are supporting novel operation strategies for users and utilities is investigated, based on data provided by real-life electrical power systems actors. Thus, consumption curves from a large customer were used, along with generation profiles for photovoltaic (PV), wind generation and electrode-boiler sources. The smart generation environment assessment will then be performed by taking into account various generation and consumption characteristics, designed to cover the majority of cases. The paper addressed the impact of distributed generation on both distribution systems operation and energy management systems.

ACS Style

Radu Porumb; Dan Apetrei; Elena Macsim. Knowledge-based decisions in smart grids. 2016 International Conference and Exposition on Electrical and Power Engineering (EPE) 2016, 733 -737.

AMA Style

Radu Porumb, Dan Apetrei, Elena Macsim. Knowledge-based decisions in smart grids. 2016 International Conference and Exposition on Electrical and Power Engineering (EPE). 2016; ():733-737.

Chicago/Turabian Style

Radu Porumb; Dan Apetrei; Elena Macsim. 2016. "Knowledge-based decisions in smart grids." 2016 International Conference and Exposition on Electrical and Power Engineering (EPE) , no. : 733-737.

Conference paper
Published: 24 November 2016 in 2016 International Conference on Applied and Theoretical Electricity (ICATE)
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In low voltage distribution electricity grids is important to examine how to protect against hazardous voltages and currents that can occur with insulation degradation. It was found that the treatment of neutral defect is important in those regimes, the present paper aim to analyze the networks with isolated neutral. Describing phenomena circuitry directly affected by faulty depend on the network parameters Ciz, Cp and R which are variable in time. Touch voltage and electric currents of earthing in case of failure constitutes selection criteria for the protection system. This is chosen depending on the size of the neutral displacement voltage, fault current and how is the variation of these parameters over time. It is also shows the calculation of the total leakage current, variation of the neutral point and its consequences. The phenomena occurring in the network are identical in the powered equipment ones, they directly influencing the security of the personnel and also of the facilities. The paper also presents how to determine the equations that allow the geometric place plotting of curves for different voltages and network parameters. It is analyzed and the situation when the earthing is done by human body, which passes an electric current whose value, depends directly on resistance Rh of the body. As a conclusion it is found that the leakage current values in the networks with isolated neutral are lower compared to the values that appear in the case of networks with neutral connected directly to the ground, resulting that networks with isolated neutral can be used better in the hazardous environments.

ACS Style

Radu Porumb; Paul-Mihai Mircea; Cornel Toader; Georgiana Buica; Constantin Beiu; Ion Mircea. Neutral point potential variation from the low voltage distribution electricity grids. 2016 International Conference on Applied and Theoretical Electricity (ICATE) 2016, 1 -5.

AMA Style

Radu Porumb, Paul-Mihai Mircea, Cornel Toader, Georgiana Buica, Constantin Beiu, Ion Mircea. Neutral point potential variation from the low voltage distribution electricity grids. 2016 International Conference on Applied and Theoretical Electricity (ICATE). 2016; ():1-5.

Chicago/Turabian Style

Radu Porumb; Paul-Mihai Mircea; Cornel Toader; Georgiana Buica; Constantin Beiu; Ion Mircea. 2016. "Neutral point potential variation from the low voltage distribution electricity grids." 2016 International Conference on Applied and Theoretical Electricity (ICATE) , no. : 1-5.

Conference paper
Published: 01 September 2016 in 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)
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This paper presents a sequential Monte Carlo (MC) method for the evaluation of the distribution network reliability, by considering the formation of microgrids supplying different portions of the network. The MC technique considers interfering near-coincident faults, as well as a mix of load profiles (residential, industrial and commercial) and renewable generation patterns (wind, photovoltaic, geothermal and waste-to-energy). Unavailability of distributed generators as well as mobile generation systems is checked in the model. In addition to this, the model takes into account two initial configurations (covering peak and off-peak hours, respectively), for getting information about the variation of the reliability when the network is operated with an intraday reconfiguration strategy. In this framework, the main challenge is the improvement of the continuity of supply level in distribution systems, allowing autonomous and intentional islanded subsystems (e.g., microgrids). The effectiveness of the proposed method is shown in a real network.

ACS Style

Pilar Meneses De Quevedo; Javier Contreras; Andrea Mazza; Gianfranco Chicco; Radu Porumb. Modeling and reliability assessment of microgrids including renewable distributed generation. 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC) 2016, 1 -6.

AMA Style

Pilar Meneses De Quevedo, Javier Contreras, Andrea Mazza, Gianfranco Chicco, Radu Porumb. Modeling and reliability assessment of microgrids including renewable distributed generation. 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC). 2016; ():1-6.

Chicago/Turabian Style

Pilar Meneses De Quevedo; Javier Contreras; Andrea Mazza; Gianfranco Chicco; Radu Porumb. 2016. "Modeling and reliability assessment of microgrids including renewable distributed generation." 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC) , no. : 1-6.

Book chapter
Published: 02 March 2016 in Electricity Distribution
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Current paper deals with three main issues, regarding the operation of the electric power systems in the presence of distributed generation. The first issue regards the assessment of the main continuity of supply parameters, such as frequency of interruptions, duration of interruption, power not served and energy no served. This issues are the base guidelines for the network system operators’ decision of building new distributed generation capacities which might be able to mitigate the electric network loss of operation. The second issue addressed was the consume variability of the various low-voltage consumers. This particularity, in conjunction with the sheer number of consumers leads to the creation of serious unbalance for the daily curve. This means that if the network system operator cannot contain the load variability, it must buy energy from intraday energy market, with a price decisively higher than the one of the reserved capacity. This issue leads to a two-fold necessity: implementing a better know-how system in order to better contain the customers load fluctuation and the necessity of distributed generation implementation, in order to help load shedding. The third issue regards general technical aspects with respect to the electrical distribution systems operation in the presence of distributed generation.

ACS Style

George Serițan; Radu Porumb; Costin Cepișcă; Sorin Grigorescu. Integration of Dispersed Power Generation. Electricity Distribution 2016, 27 -61.

AMA Style

George Serițan, Radu Porumb, Costin Cepișcă, Sorin Grigorescu. Integration of Dispersed Power Generation. Electricity Distribution. 2016; ():27-61.

Chicago/Turabian Style

George Serițan; Radu Porumb; Costin Cepișcă; Sorin Grigorescu. 2016. "Integration of Dispersed Power Generation." Electricity Distribution , no. : 27-61.

Conference paper
Published: 01 September 2015 in 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION)
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This paper presents a mathematical model used to calculate the symmetrical components depending on load current (actual values and phases) in low voltage electrical distribution networks. Based on the mathematical model proposed, transformer losses were evaluated for two windings transformers. Case studies dealt with non-symmetric mode due to load unbalance in the low voltage distribution network. Analysis of case studies was performed by modifying the actual value of the phase currents and differences related. The important assumption made was that the distribution network has symmetrical phase voltages.

ACS Style

R. Porumb; C. Toader; N. Golovanov; T. Leonida; G. Seritan. Energy efficiency rating of transformers under unbalanced linear regime. 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION) 2015, 538 -544.

AMA Style

R. Porumb, C. Toader, N. Golovanov, T. Leonida, G. Seritan. Energy efficiency rating of transformers under unbalanced linear regime. 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION). 2015; ():538-544.

Chicago/Turabian Style

R. Porumb; C. Toader; N. Golovanov; T. Leonida; G. Seritan. 2015. "Energy efficiency rating of transformers under unbalanced linear regime." 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION) , no. : 538-544.

Conference paper
Published: 01 September 2015 in 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION)
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The integration of renewables in the distribution grid has come to play an important role during the last decade. One of the ways to do it efficient is through grid reconfiguration for power loss reduction since reconfigurable networks with low resistive losses accept more intermittent renewable generation than static ones. Thus, in this paper two reconfiguration methods for a distribution network with 4 supply nodes are studied: The Deterministic Iterative Improvement and The Simulated Annealing.

ACS Style

Valentin A. Boicea; Radu Porumb; Tudor Leonida. Loss minimum reconfiguration through Deterministic Iterative Improvement and Simulated Annealing. 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION) 2015, 552 -557.

AMA Style

Valentin A. Boicea, Radu Porumb, Tudor Leonida. Loss minimum reconfiguration through Deterministic Iterative Improvement and Simulated Annealing. 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION). 2015; ():552-557.

Chicago/Turabian Style

Valentin A. Boicea; Radu Porumb; Tudor Leonida. 2015. "Loss minimum reconfiguration through Deterministic Iterative Improvement and Simulated Annealing." 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Electrical & Electronic Equipment (OPTIM) & 2015 Intl Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION) , no. : 552-557.

Conference paper
Published: 01 September 2015 in 2015 50th International Universities Power Engineering Conference (UPEC)
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The constant evolution of electricity grids towards smart grids is changing the paradigm. The intelligent layer which is added over the physical one is bringing a change in the mode in which the electricity is provided. Hence, the electricity providers are shifting their business from product-centered to service-centered ones, change that ensure a better use of their resources and a much wider acceptance from their customers. The wave of changes has reached the construction domain, and therefore the buildings have evolved into smart buildings, concept which offers a greater elasticity for both energy providers and end-users. Current paper deals with the Romanian framework for smart buildings, presenting comprehensively the drivers of change, as well as a very useful set of real-data simulations and smart solutions deployment, which will help complete the image of nowadays technological trends and future technical expectations for smart buildings.

ACS Style

Monica Mancasi; Ramona Vatu; Oana Ceaki; Radu Porumb; George Serițan. Evolution of smart buildings. A Romanian case. 2015 50th International Universities Power Engineering Conference (UPEC) 2015, 1 -4.

AMA Style

Monica Mancasi, Ramona Vatu, Oana Ceaki, Radu Porumb, George Serițan. Evolution of smart buildings. A Romanian case. 2015 50th International Universities Power Engineering Conference (UPEC). 2015; ():1-4.

Chicago/Turabian Style

Monica Mancasi; Ramona Vatu; Oana Ceaki; Radu Porumb; George Serițan. 2015. "Evolution of smart buildings. A Romanian case." 2015 50th International Universities Power Engineering Conference (UPEC) , no. : 1-4.

Conference paper
Published: 01 September 2015 in 2015 50th International Universities Power Engineering Conference (UPEC)
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Considering that the electrical power system is designed to operate in sinusoidal mode, the waveforms of voltage and current shows distortion compared to sinusoidal wave. For allowing limitation of all kinds of disturbance an effective technical solution is based on power electronics. The smart grid paradigm is encompassing an increasingly adoption of distributed generation all over the world. The flexible alternative current transmission systems (FACTS) devices, can be used to increase transmission capacity, improving stability and dynamic behavior, and ensure a better power quality at distribution level by controlling several key-parameters. The purpose of this paper is to deal with issue of power quality alteration, by assessing the power electronics equipment behavior on a real-network example, in order to create a general image of issues and solutions. The first section identifies the current state-of-the art of FACTS technologies and their influence on power quality. An example was designed in ETAP software, starting from a real electric distribution system using PV generation in order to create a general image of issues and solutions. After the SVC device connection to the system, an analysis over voltage variation was performed and interesting conclusions have been drawn.

ACS Style

Oana Ceaki; Ramona Vatu; Monica Mancasi; Radu Porumb; George Serițan. Analysis of electromagnetic disturbances with or without SVC device. 2015 50th International Universities Power Engineering Conference (UPEC) 2015, 1 -5.

AMA Style

Oana Ceaki, Ramona Vatu, Monica Mancasi, Radu Porumb, George Serițan. Analysis of electromagnetic disturbances with or without SVC device. 2015 50th International Universities Power Engineering Conference (UPEC). 2015; ():1-5.

Chicago/Turabian Style

Oana Ceaki; Ramona Vatu; Monica Mancasi; Radu Porumb; George Serițan. 2015. "Analysis of electromagnetic disturbances with or without SVC device." 2015 50th International Universities Power Engineering Conference (UPEC) , no. : 1-5.

Proceedings article
Published: 01 July 2015 in 2015 Modern Electric Power Systems (MEPS)
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As a result of the changes that occur in the electrical distribution networks, there is guidance tendency toward users, not only to power systems. This is a feature of the smart grid that will ensure safety operational and power quality, and also facilitates network connection of renewable source. Smart grid can intelligently integrate the behavior of all users connected to this network - electricity producers, users and prosumers, in order to ensure efficient delivery, sustainable, economically and with security conditions of electricity. The power balance and ancillary services provided by the storage systems in distribution network represent two aspects of one problem that must be treated properly, with in an appropriate manner, taking into account the parameters of typical distribution network. Current limits of energy storage force production to correspond to the energy used in any moment. Using storage systems is a necessity for the power system, considering the current tendency to grow of renewable sources penetration, the requirements for reliability and power quality improvement and also the implementation of smart grid. Storage systems have an important role in increasing the system efficiency and ensuring stable operation of the system by contributing to secondary and fast tertiary control. In the first section, a general analysis was performed, in order to identify the current state-of-art of energy storage systems. An example was designed, starting from a real electric distribution system, in order to create an arrangement of possible issues and solutions for electricity storage systems which provide ancillary services.

ACS Style

Ramona Vatu; Oana Ceaki; Monica Mancasi; Radu Porumb; George Seritan. Analysis of ancillary services within smart grid framework. 2015 Modern Electric Power Systems (MEPS) 2015, 1 -5.

AMA Style

Ramona Vatu, Oana Ceaki, Monica Mancasi, Radu Porumb, George Seritan. Analysis of ancillary services within smart grid framework. 2015 Modern Electric Power Systems (MEPS). 2015; ():1-5.

Chicago/Turabian Style

Ramona Vatu; Oana Ceaki; Monica Mancasi; Radu Porumb; George Seritan. 2015. "Analysis of ancillary services within smart grid framework." 2015 Modern Electric Power Systems (MEPS) , no. : 1-5.

Conference paper
Published: 01 July 2015 in 2015 Modern Electric Power Systems (MEPS)
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The expansion of the electricity grid connected photovoltaic sources requires the development of solutions for solving problems caused by disturbances in the electrical network due to their strong variable character of energy sources. The power generation of grid-connected photovoltaic plants is increasing all over the world and these plants a crucial part of the future electric energy system. To restrict the level of electromagnetic disturbance, currently effective technical solutions are based on power electronics. This paper deals with the issue of power quality alteration, by assessing the power electronics equipment operation mode on the grid-connected PV plants both on normal and restricted conditions operation. A general analysis was performed in the first section, to identifying the current state-of-the art of photovoltaic plants and their influence on power quality and an example was designed, starting from a real electric distribution system in order to create a general image of issues and solutions.

ACS Style

Oana Ceaki; Ramona Vatu; Monica Mancasi; Radu Porumb; George Seritan. Analysis of electromagnetic disturbances for grid-connected PV plants. 2015 Modern Electric Power Systems (MEPS) 2015, 1 -5.

AMA Style

Oana Ceaki, Ramona Vatu, Monica Mancasi, Radu Porumb, George Seritan. Analysis of electromagnetic disturbances for grid-connected PV plants. 2015 Modern Electric Power Systems (MEPS). 2015; ():1-5.

Chicago/Turabian Style

Oana Ceaki; Ramona Vatu; Monica Mancasi; Radu Porumb; George Seritan. 2015. "Analysis of electromagnetic disturbances for grid-connected PV plants." 2015 Modern Electric Power Systems (MEPS) , no. : 1-5.

Book chapter
Published: 17 June 2015 in Smart and Sustainable Power Systems
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ACS Style

Miguel Asensio; Pilar De Quevedo; Javier Contreras; Cláudio Monteiro; Radu Porumb; Ion Tristiu; George Serițan. Electric Price Signals, Economic Operation, and Risk Analysis. Smart and Sustainable Power Systems 2015, 285 -344.

AMA Style

Miguel Asensio, Pilar De Quevedo, Javier Contreras, Cláudio Monteiro, Radu Porumb, Ion Tristiu, George Serițan. Electric Price Signals, Economic Operation, and Risk Analysis. Smart and Sustainable Power Systems. 2015; ():285-344.

Chicago/Turabian Style

Miguel Asensio; Pilar De Quevedo; Javier Contreras; Cláudio Monteiro; Radu Porumb; Ion Tristiu; George Serițan. 2015. "Electric Price Signals, Economic Operation, and Risk Analysis." Smart and Sustainable Power Systems , no. : 285-344.

Conference paper
Published: 01 May 2015 in 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
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This paper presents a mathematical model used to calculate the symmetrical components of the load current in electrical distribution networks of low voltage. Based on the mathematical model proposed power lines were calculated tasks under sinusoidal. Case studies dealt with non-symmetric mode due to load imbalance on the distribution network of low voltage. Analysis of case studies was done by modifying the actual values of the phase currents and differences related. Important assumption is that the distribution network is symmetrical phase voltages.

ACS Style

Cornel Toader; Radu Porumb; Constantin Bulac; Ion Tristiu. A perspective on current unbalance in low voltage distribution networks. 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE) 2015, 741 -746.

AMA Style

Cornel Toader, Radu Porumb, Constantin Bulac, Ion Tristiu. A perspective on current unbalance in low voltage distribution networks. 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE). 2015; ():741-746.

Chicago/Turabian Style

Cornel Toader; Radu Porumb; Constantin Bulac; Ion Tristiu. 2015. "A perspective on current unbalance in low voltage distribution networks." 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE) , no. : 741-746.

Conference paper
Published: 01 November 2014 in 2014 International Symposium on Fundamentals of Electrical Engineering (ISFEE)
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The smart grid paradigm for the electric power systems is encompassing an increasingly adoption of distributed generation all over the world. This trend requires the input from flexible alternative current transmission systems (FACTS) devices, which can be used to increase transmission capacity, improving stability and dynamic behavior, and ensure a better quality of energy by controlling several parameters. Current paper deals with the issue of power quality influence, by assessing the static VAR compensator (SVC) operation mode on the grid-connected PV plants in order to assess the power quality limitations imposed by PV plants operation on sensible loads. In the first section, a general analysis was performed, aimed at identifying the current state-of-the art of FACTS technologies and their influence on power quality. An example was designed, starting from a real electric distribution system to which a generic SVC device was added, in order to create a general image of issues and solutions.

ACS Style

Oana Ceaki; Ramona Vatu; Nicolae Golovanov; Radu Porumb; George Serițan. Analysis of SVC influence on the power quality for grid-connected PV plants. 2014 International Symposium on Fundamentals of Electrical Engineering (ISFEE) 2014, 1 -5.

AMA Style

Oana Ceaki, Ramona Vatu, Nicolae Golovanov, Radu Porumb, George Serițan. Analysis of SVC influence on the power quality for grid-connected PV plants. 2014 International Symposium on Fundamentals of Electrical Engineering (ISFEE). 2014; ():1-5.

Chicago/Turabian Style

Oana Ceaki; Ramona Vatu; Nicolae Golovanov; Radu Porumb; George Serițan. 2014. "Analysis of SVC influence on the power quality for grid-connected PV plants." 2014 International Symposium on Fundamentals of Electrical Engineering (ISFEE) , no. : 1-5.