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Dr. Lucian Toma
University Politehnica of Bucharest

Basic Info


Research Keywords & Expertise

0 Electricity Markets
0 microgrids
0 Electric Vehicle
0 Energy Storage Systems
0 Virtual Power Plant

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Energy Storage Systems
Virtual Power Plant
FACTS devices
microgrids
Electricity Markets
voltage stability and control in power systems
Electric Vehicle
HVDC Systems
frequency stability and control in power systems

Honors and Awards

Best Poster Award, Bucharest 2018 Symposium on Microgrids

Best Poster Award, Bucharest 2018 Symposium on Microgrids, Real-time simulation of small-scale power grids with software in-the-loop and hardware in-the-loop experiments, Authors: Radu Plamanescu, Abouzar Estebsari, Edoardo Patti, Lucian Toma

2018 Symposium on Microgrids


The anniversary award „Remus Răduleț” of the Romanian Academy of Technical Sciences

The anniversary award „Remus Răduleț” of the Romanian Academy of Technical Sciences for the book „Advanced Solutions in Power Systems: HVDC, FACTS, and Artificial Intelligence”, 2017

Romanian Academy of Technical Sciences


2013 AGIR Award

2013 AGIR Award, in conjunction with the Romanian Academy for Technical Sciences for the book „Handbook of Electrical Power System Dynamics: Modeling, Stability, and Control”.

AGIR - Romania




Career Timeline

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Short Biography

Lucian Toma received the B.Sc. and Ph.D degree in electrical power engineering from the University “Politehnica” of Bucharest in 2002 and 2010, respectively. Currently he is associate professor at the same university, at the Department of Electrical Power Systems. His fields of interest include power system dynamics, computer modeling of power system components (including FACTS devices and HVDC), smart grids and electricity markets. Since 2014 he is the representative of Romania in the CIGRE B4 Study Committee on “DC systems and power electronics”. Dr. Toma is coauthor of 4 books, of which 2 published by IEEE Press and Wiley, as well as over 70 papers published in journals and conference proceedings. He was engaged in 9 international (e.g. H2020-RESERVE, H2020-Storage4Grid, H2020-NobelGrid) and 11 national research grants, and 10 consultancy projects for industry. Since 2018 he is the Vice-Chair of the IEEE Romania Section. Dr. Toma is the recipient of the 2017 anniversary award „Remus Răduleț” presented by the Romanian Academy of Technical Sciences, the 2013 year award presented by AGIR, and IEEE Outstanding Engineer Awards presented by IEEE PES Romania Chapter in 2016.

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Project

Project Goal: Industry innovators from 9 European countries will integrate multiple sources of renewable energy and excess heat at four demonstration sites across Europe to showcase solutions for 100% fossil free district heating and cooling systems.

Starting Date:01 October 2019

Current Stage: on going

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Project

Project Goal: ITCity is aimed at responding to the citizens’ needs for new information technologies applications of various energy technologies usage, integrated in an intelligent way within Platform area at City level. The general expected results are based on the design of an intelligent ICT platform that will promote energy efficiency initiative in cities and municipalities, will contribute to urban planning and environmental lifestyle, will take part in active power management of energy consumption and will support energy end users who become active market players. The creation of a platform for the direct communication with the consumer may also play an important role in the development and consolidation of smart cities, thus supporting the development of innovative services for the electricity market. Project results will also provide system users with solutions related to smart services and will ensure transparency for efficient use of the available resources related to the multienergy vectors. The newly elaborated intelligent ICT platform will contribute to city energy ecosystem, and will improve city services and quality of life at transnational level.

Starting Date:02 January 2017

Current Stage: finalised

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Project

Project Goal: Storage4Grid aims at boosting the uptake of storage technologies between the distribution grid level and the end-user level, by developing a novel, holistic methodology for modeling, planning, integrating, operating and evaluating distributed Energy Storage Systems. The Storage4Grid methodology encompasses storage at user premises and storage at substation level, Electrical Vehicles, innovative energy metering and energy routing technologies.

Starting Date:01 November 2016

Current Stage: finalised

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Project

Project Goal: RESERVE aimed to develop new techniques and solutions for the frequency and voltage control procedures as ancillary services in power systems and to adapt the pan-European unified network codes in the context or 100% share of generation from renewable energy sources. Near real-time control of the electrical network were enabled by innovative 5G based ICT. Use case scenarios were developed as the basis for analysis. Performance characteristics of the new control mechanisms were investigated through integration of energy simulations and live 5G communications.

Starting Date:01 October 2016

Current Stage: finalised

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Project

Project Goal: NOBEL GRID is developing, deploying and evaluating advanced tools, ICT services and business models for all actors in the smart grid and electricity market, in order to ensure shared benefits from cheaper prices, more secure and stable grids and cleaner electricity. These tools and services are enabling active consumers’ involvement and the innovative business models for new actors and facilitate the integration of distributed renewable energy production, in order to improve the quality of life of European citizens.

Starting Date:01 January 2015

Current Stage: finalised

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Journal article
Published: 07 July 2021 in IEEE Transactions on Industrial Informatics
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Capturing the dynamic behavior of the power distribution grids, especially under high penetration of renewables, is of high interest for grid operators. The distribution power grids are not fully observable due to lack of sufficient metering infrastructure, especially downstream of medium voltage substations. Therefore, fusion of data recorded at significantly different reporting rates was proposed to increase the situational awareness of the system with non-negligible effect on the accuracy of the monitoring tool. Higher reporting rates are possible for next generation smart meters, but they raise higher concerns about data privacy, already an issue for smart meters rollout. This work proposes a framework for knowledge extraction from high reporting-rate smart metering data. The process takes place at smart meter level and with low computation and communication costs and preserving user privacy, with the scope to increase the accuracy of the monitoring tools for distribution power grids. The methodology makes use of statistical metrics able to capture system dynamics relevant for network diagnosis. The proposed approach is validated on a three-phase low voltage power flow model applied to a realistic testbed microgrid and real field measurements synchronized at one second.

ACS Style

Mihai Sanduleac; Viorica Irina Ciornei; Lucian Toma; Radu Plamanescu; Ana-Maria Dumitrescu; Mihaela Albu. High reporting rate smart metering data for enhanced grid monitoring and services for energy communities. IEEE Transactions on Industrial Informatics 2021, PP, 1 -1.

AMA Style

Mihai Sanduleac, Viorica Irina Ciornei, Lucian Toma, Radu Plamanescu, Ana-Maria Dumitrescu, Mihaela Albu. High reporting rate smart metering data for enhanced grid monitoring and services for energy communities. IEEE Transactions on Industrial Informatics. 2021; PP (99):1-1.

Chicago/Turabian Style

Mihai Sanduleac; Viorica Irina Ciornei; Lucian Toma; Radu Plamanescu; Ana-Maria Dumitrescu; Mihaela Albu. 2021. "High reporting rate smart metering data for enhanced grid monitoring and services for energy communities." IEEE Transactions on Industrial Informatics PP, no. 99: 1-1.

Journal article
Published: 16 March 2021 in Energies
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The concept of high-voltage DC transmission using a multiterminal configuration is presently a central topic of research and investment due to rekindled interest in renewable energy resource integration. Moreover, great attention is given to fault analysis, which leads to the necessity of developing proper tools that enable proficient dynamic simulations. This paper leverages models and control system design techniques and demonstrates their appropriateness for scenarios in which faults are applied. Furthermore, this paper relies on full-bridge submodule topologies in order to underline the increase in resilience that such a configuration brings to the multiterminal DC network, after an unexpected disturbance. Therefore, strong focus is given to fault response, considering that converters use a full-bridge topology and that overhead power lines connect the terminals.

ACS Style

Ioan-Cătălin Damian; Mircea Eremia; Lucian Toma. Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules. Energies 2021, 14, 1653 .

AMA Style

Ioan-Cătălin Damian, Mircea Eremia, Lucian Toma. Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules. Energies. 2021; 14 (6):1653.

Chicago/Turabian Style

Ioan-Cătălin Damian; Mircea Eremia; Lucian Toma. 2021. "Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules." Energies 14, no. 6: 1653.

Conference paper
Published: 19 November 2020 in 2020 4th International Conference on Power and Energy Engineering (ICPEE)
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Present day European transmission networks are becoming increasingly congested. Furthermore, this issue limits the integration of renewable energy sources. In order to solve the problem, this paper presents a novel high voltage DC network, consisting of three modular multilevel converters, located in Eastern-Europe. For simulation purposes, detailed equivalent models are used instead of average value models, with the scope of capturing power/energy variations. Moreover, for each converter terminal, vector control is deployed, in order to properly underline the utility of this network. As such, a proper controller tuning technique is shown, that uses Modulus Optimum criterion. Simulations are performed using Matlab/Simulink.

ACS Style

Ioan Catalin Damian; Mircea Eremia; Lucian Toma. Modelling and Control of a Novel East-European Multiterminal High Voltage DC Network. 2020 4th International Conference on Power and Energy Engineering (ICPEE) 2020, 151 -156.

AMA Style

Ioan Catalin Damian, Mircea Eremia, Lucian Toma. Modelling and Control of a Novel East-European Multiterminal High Voltage DC Network. 2020 4th International Conference on Power and Energy Engineering (ICPEE). 2020; ():151-156.

Chicago/Turabian Style

Ioan Catalin Damian; Mircea Eremia; Lucian Toma. 2020. "Modelling and Control of a Novel East-European Multiterminal High Voltage DC Network." 2020 4th International Conference on Power and Energy Engineering (ICPEE) , no. : 151-156.

Conference paper
Published: 01 September 2020 in 2020 55th International Universities Power Engineering Conference (UPEC)
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Presently, there is a rising interest towards multiterminal high voltage direct current networks which use multilevel converters. Furthermore, even though full-bridge submodule topologies have some advantages over half-bridge, there is less research regarding simulation and control of multiterminal networks with such topology. The goal of this paper is to bring forward a detailed modelling method for modular multilevel converters, which use full-bridge submodules, in the context of multiterminal networks. Moreover, great attention is given to the process of converter controller tuning. The simulation and control method are demonstrated using Matlab/Simulink.

ACS Style

Ioan-Catalin Damian; Mircea Eremia; Lucian Toma. Detailed Modelling and Control of a Modular Multilevel Converter with Full-Bridge Submodules in a Multi-Terminal High Voltage DC Network. 2020 55th International Universities Power Engineering Conference (UPEC) 2020, 1 -6.

AMA Style

Ioan-Catalin Damian, Mircea Eremia, Lucian Toma. Detailed Modelling and Control of a Modular Multilevel Converter with Full-Bridge Submodules in a Multi-Terminal High Voltage DC Network. 2020 55th International Universities Power Engineering Conference (UPEC). 2020; ():1-6.

Chicago/Turabian Style

Ioan-Catalin Damian; Mircea Eremia; Lucian Toma. 2020. "Detailed Modelling and Control of a Modular Multilevel Converter with Full-Bridge Submodules in a Multi-Terminal High Voltage DC Network." 2020 55th International Universities Power Engineering Conference (UPEC) , no. : 1-6.

Conference paper
Published: 01 September 2020 in 2020 55th International Universities Power Engineering Conference (UPEC)
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This paper aims to analyze the frequency behavior of the Romanian power system under various severe operating conditions. These conditions are referring to large unbalances of active power, sudden and slow, and short circuits. Our analysis includes results from PMU measurements that have been performed by Romanian TSO Transelectrica S.A. using the wide area measurement system (WAMS) implemented in the Romanian Transmission Network (RTN) and by the MicroDERlab group from University Politehnica of Bucharest.

ACS Style

Lucian Toma; Mihai Sanduleac; Dorian-Octavian Sidea; Carmen Stanescu; Ciprian Diaconu; Mihaela Albu; Ana-Maria Dumitrescu. Frequency Dynamics in the Romanian Power System under Large Perturbations. 2020 55th International Universities Power Engineering Conference (UPEC) 2020, 1 -6.

AMA Style

Lucian Toma, Mihai Sanduleac, Dorian-Octavian Sidea, Carmen Stanescu, Ciprian Diaconu, Mihaela Albu, Ana-Maria Dumitrescu. Frequency Dynamics in the Romanian Power System under Large Perturbations. 2020 55th International Universities Power Engineering Conference (UPEC). 2020; ():1-6.

Chicago/Turabian Style

Lucian Toma; Mihai Sanduleac; Dorian-Octavian Sidea; Carmen Stanescu; Ciprian Diaconu; Mihaela Albu; Ana-Maria Dumitrescu. 2020. "Frequency Dynamics in the Romanian Power System under Large Perturbations." 2020 55th International Universities Power Engineering Conference (UPEC) , no. : 1-6.

Conference paper
Published: 01 October 2019 in 2019 Electric Vehicles International Conference (EV)
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In the context of the massive increase in share of generation from renewable energy sources (RES), the network operators face increasing challenges related to the reliable and stable operation of the power system, at the same time with ensuring the balancing between generation and load. Electric Vehicles (EVs) can support RES integration by appropriate design of the electricity markets, allowing their owner of the aggregators to use their energy storage capability to balance the load. In this paper, we propose an optimization model aiming to determine the available power reserved that allow the EVs to participate in the balancing market. The aim is also to maximize the expected revenue of the aggregator and minimize the imbalances between the forecasted and the real load.

ACS Style

Adrian-Toni Radu; Mircea Eremia; Lucian Toma. Participation of the Electric Vehicles in the Balancing Market. 2019 Electric Vehicles International Conference (EV) 2019, 1 -6.

AMA Style

Adrian-Toni Radu, Mircea Eremia, Lucian Toma. Participation of the Electric Vehicles in the Balancing Market. 2019 Electric Vehicles International Conference (EV). 2019; ():1-6.

Chicago/Turabian Style

Adrian-Toni Radu; Mircea Eremia; Lucian Toma. 2019. "Participation of the Electric Vehicles in the Balancing Market." 2019 Electric Vehicles International Conference (EV) , no. : 1-6.

Conference paper
Published: 01 September 2019 in 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
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The integration of Grid Interactive Battery Energy Storage Systems (GI-BESSs) in energy services, such as peak shaving and load balancing, is a common practice in the modern-day electric power system. However, it is essential to ensure their economic feasibility, such as through their incorporation in Power Oscillation Damping (POD). This paper proposes an optimized control algorithm for a GI-BESS to mitigate low-frequency oscillations by utilizing synchrophasor measurements gathered by the Wide Area Measurement System (WAMS). The proposed algorithm enables the GI-BESS to mitigate inter-area active power oscillation by altering the exchange of reactive power between the grid and the GI-BESS. Thus, by using the proposed algorithm, the GI-BESS can provide power and energy services, simultaneously. Moreover, the effects of this controller on State of Charge (SoC) and dispatched power are assessed. The algorithm is tested on an IEEE 39-bus system and demonstrates that the proposed algorithm improves the damping of inter-area oscillations.

ACS Style

Roozbeh Torkzadeh; Harold R. Chamorro; Rebecca Rye; Mojtaba Eliassi; Lucian Toma; Francisco Gonzalez-Longatt. Reactive Power Control of Grid Interactive Battery Energy Storage System for WADC. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Roozbeh Torkzadeh, Harold R. Chamorro, Rebecca Rye, Mojtaba Eliassi, Lucian Toma, Francisco Gonzalez-Longatt. Reactive Power Control of Grid Interactive Battery Energy Storage System for WADC. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Roozbeh Torkzadeh; Harold R. Chamorro; Rebecca Rye; Mojtaba Eliassi; Lucian Toma; Francisco Gonzalez-Longatt. 2019. "Reactive Power Control of Grid Interactive Battery Energy Storage System for WADC." 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) , no. : 1-5.

Conference paper
Published: 01 September 2019 in 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
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Hybrid HVDC links incorporate both Line Commutated Converters (LCC) and Voltage Source Converters (VSC) systems, thereby gathering the benefits of both technologies. Supplementary Power Oscillation Damping (POD) controllers can be added to both LCCs and VSCs to help enhance the power system stability against disturbances, such as short circuits. However POD controller tuning can be a delicate process, due to the highly non-linear and complex nature of the involved power system, which might induce adverse interactions leading to a reduced damping. This paper proposes the application of the Simulated Annealing Algorithm (SAA) for tuning the POD controllers parameters, with the purpose of optimizing the performance of POD controllers in the power system. The damping performance is evaluated in case of multiple disturbances in a test power system. The results show the ability of the proposed technique to enhance the performance of the POD controllers under various operating conditions.

ACS Style

Harold R. Chamorro; Roozbeh Torkzadeh; Omar Kotb; Kumars Rouzbehi; Juan Manuel Escaño; Francisco Gonzalez-Longatt; Oriol Gomis Bellmunt; Lucian Toma; Vijay K. Sood. On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019, 1 -5.

AMA Style

Harold R. Chamorro, Roozbeh Torkzadeh, Omar Kotb, Kumars Rouzbehi, Juan Manuel Escaño, Francisco Gonzalez-Longatt, Oriol Gomis Bellmunt, Lucian Toma, Vijay K. Sood. On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link. 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). 2019; ():1-5.

Chicago/Turabian Style

Harold R. Chamorro; Roozbeh Torkzadeh; Omar Kotb; Kumars Rouzbehi; Juan Manuel Escaño; Francisco Gonzalez-Longatt; Oriol Gomis Bellmunt; Lucian Toma; Vijay K. Sood. 2019. "On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link." 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) , no. : 1-5.

Journal article
Published: 26 August 2019 in Energies
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Microgrids are about to change the architecture and the operation principles of the future power systems towards smartness and resiliency. Power electronics technologies are key enablers for novel solutions. In this paper we analyze the benefits of a “microgrid by design” architecture (MDA), using a solid-state transformer (SST) as a low-voltage grid-former and inverter-based generation only. In this context, the microgrid stability is maintained with the help of “electrostatic energy inertia” that can be provided by the capacitor connected to the DC busbar behind the SST inverter topology. This happens in a natural way, alike the mechanical inertia in power systems with synchronous machines, however without depending on frequency and without the need of a rotational inertia. This type of microgrid always operates (both fully connected to the main grid or in islanding mode) with all the necessary mechanisms needed to maintain the microgrid stable—no matter of the perturbations in the upstream of the point of common coupling (PCC). In the case of microgrids with inverter-based generation only (including the energy storage systems), there is no mechanical inertia and different stability mechanisms need to be applied compared to the stability principle of the classical power systems. Our proposed mechanism differentiates from the recently proposed stability assessments of microgrids based on virtual synchronous generators from the control theory perspective. This paper is a continuation of our previous work where the MDA was first introduced. The use-cases and scenarios are based on realistic and yet reasonable complexities, by coupling the disturbance magnitude with the voltage stability limit in power grids. The paper finds meaningful disturbances to test the electrostatic energy inertia at the boundaries of grid stability, as guidance to understand the range of voltage variation for extreme conditions. The results show that in microgrids with inverter-based generation only and passive loads (RLC type) the operation is no longer frequency dependent. The energy of the DC busbar capacitor as electrostatic energy inertia of the MDA has a role similar to that of the rotational machines in classical grids in terms of maintaining dynamic stability, however impacting two different types of stability.

ACS Style

Mihai Sanduleac; Lucian Toma; Mircea Eremia; Irina Ciornei; Constantin Bulac; Ion Triștiu; Andreea Iantoc; João F. Martins; Vitor F. Pires. On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability. Energies 2019, 12, 3274 .

AMA Style

Mihai Sanduleac, Lucian Toma, Mircea Eremia, Irina Ciornei, Constantin Bulac, Ion Triștiu, Andreea Iantoc, João F. Martins, Vitor F. Pires. On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability. Energies. 2019; 12 (17):3274.

Chicago/Turabian Style

Mihai Sanduleac; Lucian Toma; Mircea Eremia; Irina Ciornei; Constantin Bulac; Ion Triștiu; Andreea Iantoc; João F. Martins; Vitor F. Pires. 2019. "On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability." Energies 12, no. 17: 3274.

Proceedings article
Published: 01 June 2019 in 2019 IEEE Milan PowerTech
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This paper presents a charging management strategy of the Electric Vehicles to support the integration of renewable energy sources and distributed generation, according to users preferences (drivers), and aims at achieving a scheduled aggregated power profile in order to minimize the effects of intermittency of the energy sources, such as wind and photovoltaics. The excess energy is planned to be stored in electrical vehicles batteries so that to improve the stability of the electrical network as a whole, and to meet the technical constraints to allow large-scale integration of distributed energy resources (DER). The proposed control approach allows “flexible” EV users to participate in demand response programs, which may play a crucial role in improving stability and efficiency of future smart grids.

ACS Style

Adrian-Toni Radu; Mircea Eremia; Lucian Toma. Optimal charging coordination of electric vehicles considering distributed energy resources. 2019 IEEE Milan PowerTech 2019, 1 -6.

AMA Style

Adrian-Toni Radu, Mircea Eremia, Lucian Toma. Optimal charging coordination of electric vehicles considering distributed energy resources. 2019 IEEE Milan PowerTech. 2019; ():1-6.

Chicago/Turabian Style

Adrian-Toni Radu; Mircea Eremia; Lucian Toma. 2019. "Optimal charging coordination of electric vehicles considering distributed energy resources." 2019 IEEE Milan PowerTech , no. : 1-6.

Conference paper
Published: 01 June 2019 in 2019 IEEE Milan PowerTech
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Microgrids represent a promising concept able to solve numerous problems of traditional power systems, such as reliability and environmental issues, through a multi-sources coordination, including renewable energy integration and storage devices. In order to overcome the challenges of variation in load and generation, microgrids need efficient operation and control. The paper proposes a scheduling framework for the microgrid operation considering renewable sources generation and battery energy storage system (BESS), using a modified genetic algorithm. For a better understanding of the microgrid operation, numerous generation and storage scenarios were investigated in this paper, in order to minimize the energy imbalance in the analyzed system.

ACS Style

Dorian-Octavian Sidea; Lucian Toma; Mihai Sanduleac; Irina-Ioana Picioroaga; Valentin-Adrian Boicea. Optimal BESS Scheduling Strategy in Microgrids Based on Genetic Algorithms. 2019 IEEE Milan PowerTech 2019, 1 -6.

AMA Style

Dorian-Octavian Sidea, Lucian Toma, Mihai Sanduleac, Irina-Ioana Picioroaga, Valentin-Adrian Boicea. Optimal BESS Scheduling Strategy in Microgrids Based on Genetic Algorithms. 2019 IEEE Milan PowerTech. 2019; ():1-6.

Chicago/Turabian Style

Dorian-Octavian Sidea; Lucian Toma; Mihai Sanduleac; Irina-Ioana Picioroaga; Valentin-Adrian Boicea. 2019. "Optimal BESS Scheduling Strategy in Microgrids Based on Genetic Algorithms." 2019 IEEE Milan PowerTech , no. : 1-6.

Conference paper
Published: 01 March 2019 in 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
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A new methodology for fast detection of power grid faults is proposed in this paper based on synchronized measurements. The methodology is based on real data recorded during a fault that occurred on a 400 kV transmission line. The data were processed and analyzed using Excel. The results are intended to guide the authors in defining a new strategy for fast detection of power systems faults, eventually by developing new protection functions to be included in adaptive protection equipment. The intention is to change the philosophy of the transmission line protection by using the rate of change of voltage angle, rate of change of current angle and other information provided by synchronized and high sampling intervals instead of using current amplitude derivatives.

ACS Style

Hariss Nicorescu; Lucian Toma; Mircea Eremia. Fast Detection of Grid Faults using Synchronized Measurements. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) 2019, 1 -6.

AMA Style

Hariss Nicorescu, Lucian Toma, Mircea Eremia. Fast Detection of Grid Faults using Synchronized Measurements. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). 2019; ():1-6.

Chicago/Turabian Style

Hariss Nicorescu; Lucian Toma; Mircea Eremia. 2019. "Fast Detection of Grid Faults using Synchronized Measurements." 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) , no. : 1-6.

Journal article
Published: 03 December 2018 in Energies
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Solid State Transformers (SST) may become, in the near future, key technological enablers for decentralized energy supply systems. They have the potential to unleash new technologies and operation strategies of microgrids and prosumers to move faster towards a low carbon-based economy. This work proposes a paradigm change in the hierarchically and distributed operated power systems where SSTs are used to asynchronously connect the many small low voltage (LV) distribution networks, such as clusters of prosumers or LV microgrids, to the bulk power system. The need for asynchronously coupled microgrids requires a design that allows the LV system to operate independently from the bulk grid and to rely on its own control systems. The purpose of this new approach is to achieve immune and resilient by design configurations that allow maximizing the integration of Local Renewable Energy Resources (L-RES). The paper analyses from the stability point of view, through simplified numerical simulations, the way in which SST-interconnected microgrids can become immune to disturbances that occur in the bulk power system and how sudden changes in the microgrid can damp out at the Point of Common Coupling (PCC), thus achieving better reliability and predictability in both systems and enabling strong and healthy distributed energy storage systems (DESSs). Moreover, it is shown that in a fully inverter-based microgrid there is no need for mechanical or synthetic inertia to stabilize the microgrid during power unbalances. This happens because the electrostatic energy stored in the capacitors connected behind the SST inverter can be used for a brief time interval, until automation is activated to address the power unbalance for a longer term.

ACS Style

Mihai Sanduleac; João F. Martins; Irina Ciornei; Mihaela Albu; Lucian Toma; Vitor Fernão Pires; Lenos Hadjidemetriou; Rooktabir Sauba. Resilient and Immune by Design Microgrids Using Solid State Transformers. Energies 2018, 11, 3377 .

AMA Style

Mihai Sanduleac, João F. Martins, Irina Ciornei, Mihaela Albu, Lucian Toma, Vitor Fernão Pires, Lenos Hadjidemetriou, Rooktabir Sauba. Resilient and Immune by Design Microgrids Using Solid State Transformers. Energies. 2018; 11 (12):3377.

Chicago/Turabian Style

Mihai Sanduleac; João F. Martins; Irina Ciornei; Mihaela Albu; Lucian Toma; Vitor Fernão Pires; Lenos Hadjidemetriou; Rooktabir Sauba. 2018. "Resilient and Immune by Design Microgrids Using Solid State Transformers." Energies 11, no. 12: 3377.

Conference paper
Published: 01 June 2018 in 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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This paper addresses the feasibility of a battery energy storage system (BESS) contribution to primary frequency control by simulating its state of charge over several days and by using frequency measurements in the Romanian power system. A BESS correction algorithm has been developed to overcome the average frequency asymmetry which may bring the state of charge to zero or 100%, thus not allowing further primary frequency control due to total discharge or total charge of the storage resource. It is demonstrated that for a number of selected days the algorithm provides good results, the primary frequency control is delivered over entire days, and that a reserve of energy remains in the battery for eventual disturbances in the system, for both over and under frequency needs.

ACS Style

Mihai Sanduleac; Lucian Toma; Mircea Eremia; Valentin A. Boicea; Dorian Sidea; Alexandru Mandis. Primary Frequency Control in a Power System with Battery Energy Storage Systems. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2018, 1 -5.

AMA Style

Mihai Sanduleac, Lucian Toma, Mircea Eremia, Valentin A. Boicea, Dorian Sidea, Alexandru Mandis. Primary Frequency Control in a Power System with Battery Energy Storage Systems. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). 2018; ():1-5.

Chicago/Turabian Style

Mihai Sanduleac; Lucian Toma; Mircea Eremia; Valentin A. Boicea; Dorian Sidea; Alexandru Mandis. 2018. "Primary Frequency Control in a Power System with Battery Energy Storage Systems." 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) , no. : 1-5.

Conference paper
Published: 01 June 2018 in 2018 IEEE International Energy Conference (ENERGYCON)
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This paper emphasizes the importance of battery energy storage systems (BESS) for frequency stability in low inertia power systems. A mixed input signal is considered for the BESS control, consisting of the frequency variation and the rate of change of frequency, as a solution to deploy the BESS for providing both inertia and primary frequency control. A sensitivity analysis on the influence of each input signal and the reaction time of the BESS on the frequency control, as well as on the frequency stabilization was performed. Simulation are conducted on a two-area interconnected power system to study and validate the capability of BESS to provide virtual inertia and contribute to system frequency regulation.

ACS Style

Lucian Toma; Mihai Sanduleac; Stefan Andrei Baltac; Francesco Arrigo; Andrea Mazza; Ettore Bompard; Aysar Musa; Antonello Monti. On the virtual inertia provision by BESS in low inertia power systems. 2018 IEEE International Energy Conference (ENERGYCON) 2018, 1 -6.

AMA Style

Lucian Toma, Mihai Sanduleac, Stefan Andrei Baltac, Francesco Arrigo, Andrea Mazza, Ettore Bompard, Aysar Musa, Antonello Monti. On the virtual inertia provision by BESS in low inertia power systems. 2018 IEEE International Energy Conference (ENERGYCON). 2018; ():1-6.

Chicago/Turabian Style

Lucian Toma; Mihai Sanduleac; Stefan Andrei Baltac; Francesco Arrigo; Andrea Mazza; Ettore Bompard; Aysar Musa; Antonello Monti. 2018. "On the virtual inertia provision by BESS in low inertia power systems." 2018 IEEE International Energy Conference (ENERGYCON) , no. : 1-6.