This page has only limited features, please log in for full access.

Dr. Mihaela Albu
Politehnica University of Bucharest

Basic Info


Research Keywords & Expertise

0 Power Quality
0 Smart Metering
0 microgrids
0 intelligent control
0 Measurements for modern power networks

Fingerprints

Power Quality
microgrids
Smart Metering
intelligent control
Measurements for modern power networks

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 07 July 2021 in IEEE Transactions on Industrial Informatics
Reads 0
Downloads 0

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: 27 March 2021 in Energies
Reads 0
Downloads 0

The electric power systems together with the entire energy sector are rapidly evolving towards a low-carbon, secure, and competitive economy facing revolutionary transformations from technical structure to economic value chain. Pathways to achieve sustainability led to the development of new technologies, accommodation of larger shares of unpredictable and stochastic electricity transfer from sources to end-users without loss of reliability, new business models and services, data management, and so on. The new technologies and incentives for local energy communities along with large development of microgrids are main forces driving the evolution of the low voltage energy sector changing the context and paradigm of rigid contractual binding between utilities and end-user customers (now progressing to flexible prosumers with generation and storage capabilities). The flexibility and operation of a prosumer can be enhanced by a non-intrusive time-frequency analysis of distorted power quality waveforms for both generation and demand at the point of common connection. Therefore, it becomes of importance to discriminate among successive quasi-steady-state operation of a given local system using only the aggregated waveforms information available in the PCC. This paper focuses on the Hilbert–Huang method with modifications such as empirical mode decomposition improved with masking signals based on the Fast Fourier Transform, Hilbert spectral analysis, and a post-processing method for separating components and their amplitudes and frequencies within distorted power signals for a low-voltage prosumer operation. The method is used for a time-frequency-magnitude representation with promising localization capabilities enabling efficient operation for prosumers.

ACS Style

Radu Plamanescu; Ana-Maria Dumitrescu; Mihaela Albu; Siddharth Suryanarayanan. A Hybrid Hilbert-Huang Method for Monitoring Distorted Time-Varying Waveforms. Energies 2021, 14, 1864 .

AMA Style

Radu Plamanescu, Ana-Maria Dumitrescu, Mihaela Albu, Siddharth Suryanarayanan. A Hybrid Hilbert-Huang Method for Monitoring Distorted Time-Varying Waveforms. Energies. 2021; 14 (7):1864.

Chicago/Turabian Style

Radu Plamanescu; Ana-Maria Dumitrescu; Mihaela Albu; Siddharth Suryanarayanan. 2021. "A Hybrid Hilbert-Huang Method for Monitoring Distorted Time-Varying Waveforms." Energies 14, no. 7: 1864.

Journal article
Published: 20 May 2019 in IEEE Transactions on Power Delivery
Reads 0
Downloads 0

This paper presents the development and validation of a new oscillatory component load (OCL) model for a measurement-based real-time estimation of dynamic load model parameters. The proposed OCL model has been derived from a second order differential equation that considers three necessary components namely static, exponential recovery and damped oscillatory components. The performance evaluation of the proposed OCL model has been demonstrated through DIgSILENT PowerFactory based dynamic power system simulations, real-time substation data captured from phasor measurement units located at the primary substations of Leadenham, Holwell and Regent Street cities and real-time transient voltage events data provided by the EirGrid. Further, the effectiveness of the proposed OCL model has been assessed by comparing its performance with that of the existing exponential recovery load model. A new flexible and efficient SynchroHub platform, developed at the University of Manchester for real-time data acquisition, processing and visualization has been used for the real-time estimation of dynamic load model parameters. The validation results revealed the efficacy of the proposed OCL model in tracking both the first as well as the subsequent oscillations of dynamic load model response of the power system for both the steady state as well as transient operating conditions, accurately.

ACS Style

E. S. N. Raju Paidi; Alexandru Nechifor; Mihaela M. Albu; James Yu; Vladimir Terzija; E S N Raju P. Development and Validation of a New Oscillatory Component Load Model For Real-Time Estimation of Dynamic Load Model Parameters. IEEE Transactions on Power Delivery 2019, 35, 618 -629.

AMA Style

E. S. N. Raju Paidi, Alexandru Nechifor, Mihaela M. Albu, James Yu, Vladimir Terzija, E S N Raju P. Development and Validation of a New Oscillatory Component Load Model For Real-Time Estimation of Dynamic Load Model Parameters. IEEE Transactions on Power Delivery. 2019; 35 (2):618-629.

Chicago/Turabian Style

E. S. N. Raju Paidi; Alexandru Nechifor; Mihaela M. Albu; James Yu; Vladimir Terzija; E S N Raju P. 2019. "Development and Validation of a New Oscillatory Component Load Model For Real-Time Estimation of Dynamic Load Model Parameters." IEEE Transactions on Power Delivery 35, no. 2: 618-629.

Conference paper
Published: 01 May 2019 in 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
Reads 0
Downloads 0

The definition and measurement of reactive power has been the subject of a sometimes acrimonious debate. In this paper, a number of factors leading to the present situation are exposed by reviewing the history of the matter. The contributions of Poynting (1884), Steinmetz (1892), Lyon (1920) and Budeanu (1927) are examined. It is shown that much of the debate about reactive power is founded on two fundamental and yet unrecognized mistakes made over a hundred years ago. Further debate is unwarranted because of those early mistakes, and because in the light of modern measurement theory, the character and meaning of the measurement is changed. Reactive power has been and continues to be a useful concept, its definition matters: the automation of the power system demands a solution. Some suggestions are offered.

ACS Style

Harold Kirkham; Alexander Emanuel; Mihaela Albu; David Laverty. Resolving the reactive power question. 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) 2019, 1 -6.

AMA Style

Harold Kirkham, Alexander Emanuel, Mihaela Albu, David Laverty. Resolving the reactive power question. 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). 2019; ():1-6.

Chicago/Turabian Style

Harold Kirkham; Alexander Emanuel; Mihaela Albu; David Laverty. 2019. "Resolving the reactive power question." 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) , no. : 1-6.

Conference paper
Published: 01 May 2019 in 2019 8th International Conference on Modern Power Systems (MPS)
Reads 0
Downloads 0

Prosumers are entities with a key role in the new smart grid paradigm, having enabled two ways active power exchange. The usual approach is to send excess energy to the main grid, with a cost of unpredictability of the reverse power flow. In order to achieve a high penetration of renewables in the distribution grid, with added contribution from prosumers, traditional grids need to be operated in states corresponding to active grids for which they have not been designed. Recently deployed solutions allow advanced prosumers to benefit from advancements in both storage and renewables technologies, changing the behavior of prosumers into controlled unidirectional power exchange (no-back generation), which translates into consumer-only behavior from the grid side. With this no-back generation paradigm, in this paper a number of comprehensive scenarios have been simulated and analyzed on a daily basis, based on real local production and consumption profiles and using key performance indexes. The paper shows the benefits of operating and customers with prosumers potential, which can bring substantial openings for a high renewables penetration agenda to address climate change related issues.

ACS Style

Mihai Sanduleac; Mihaela Albu; Dorel Stanescu; Carmen Stanescu. Prosumers optimally adapted to local load. Rationale and benefits for the grid. 2019 8th International Conference on Modern Power Systems (MPS) 2019, 1 -6.

AMA Style

Mihai Sanduleac, Mihaela Albu, Dorel Stanescu, Carmen Stanescu. Prosumers optimally adapted to local load. Rationale and benefits for the grid. 2019 8th International Conference on Modern Power Systems (MPS). 2019; ():1-6.

Chicago/Turabian Style

Mihai Sanduleac; Mihaela Albu; Dorel Stanescu; Carmen Stanescu. 2019. "Prosumers optimally adapted to local load. Rationale and benefits for the grid." 2019 8th International Conference on Modern Power Systems (MPS) , no. : 1-6.

Conference paper
Published: 01 May 2019 in 2019 8th International Conference on Modern Power Systems (MPS)
Reads 0
Downloads 0

Protection system relying on SCADA information is the cornerstone of transmission system operation. Recently, phasor measurement units have been deployed on a wider scale and several applications based on the synchronized measurement information are developed. Based on the Romanian policy regarding Smart Grid deployment, in this paper a proposal for information exchange between existing SCADA and the newly deployed synchrophasor measurement system is presented. Both the physical and communication layers SCADA-PDC-PMUs are described. Data exchange protocol needs to fulfill both protection requirements for each system element and for the dispatching center, in order to achieve the EMS-SCADA functionalities. It is underlined the importance of achieving interoperability using as example the state estimation routinely performed by the TSO. It is described a platform for data and information exchange where new logical blocks are integrated for achieving fast protection functionalities using the synchronized information provided by PMUs. The paper concludes with practical recommendations and future work.

ACS Style

Hariss Nicorescu; Mihaela Albu; Mircea Eremia. Achieving interoperability of power system protection using SCADA and PMU information. 2019 8th International Conference on Modern Power Systems (MPS) 2019, 1 -4.

AMA Style

Hariss Nicorescu, Mihaela Albu, Mircea Eremia. Achieving interoperability of power system protection using SCADA and PMU information. 2019 8th International Conference on Modern Power Systems (MPS). 2019; ():1-4.

Chicago/Turabian Style

Hariss Nicorescu; Mihaela Albu; Mircea Eremia. 2019. "Achieving interoperability of power system protection using SCADA and PMU information." 2019 8th International Conference on Modern Power Systems (MPS) , no. : 1-4.

Proceedings article
Published: 01 March 2019 in 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Reads 0
Downloads 0

Operation of distribution grids undergoes dramatic changes in the era of smart grid deployment, mainly due to a higher penetration of distributed generation, which is linked to an ever-increased share of power electronics mediated energy transfer. Thanks to advancements in instrumentation, including smart metering and other high reporting rate measurements, one can unlock deployment of advanced technologies and dedicated smart grid services by means of standardized software platform able to support data interoperability and information consistency. This new measurement set-up in smart grids brings a measurement synchronization potential and, therefore, opens the way for developing applications able to analyze high amount of data. Among the most suitable measurement devices used for power system monitoring and control and having high accuracy, synchronization features and high reporting rates, one can count the Phasor Measurement Units (PMU) and the microPMUs. When deployed with the highest reporting rate (50, and up to 100 frames/s), the volume of information coming from the measurements is huge and requires solutions for data management. The Big Data Analytics (BDA) concept and technique would give us the solution to this issue. In this paper, applications developed for the FIWARE platform are presented, as developed in the frame of the ERA NET project FISMEP.

ACS Style

Radu Plamanescu; Stefan Gheorghe; Mihai Sarb; Antonia Istenes; Mihaela Albu. A Synchronized Measurements Fiware Platform for Smart Grid Applications. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) 2019, 1 -5.

AMA Style

Radu Plamanescu, Stefan Gheorghe, Mihai Sarb, Antonia Istenes, Mihaela Albu. A Synchronized Measurements Fiware Platform for Smart Grid Applications. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). 2019; ():1-5.

Chicago/Turabian Style

Radu Plamanescu; Stefan Gheorghe; Mihai Sarb; Antonia Istenes; Mihaela Albu. 2019. "A Synchronized Measurements Fiware Platform for Smart Grid Applications." 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) , no. : 1-5.

Proceedings article
Published: 01 March 2019 in 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Reads 0
Downloads 0

Monitoring and control of the energy transfer in electricity grids is performed using the information provided by complex measurement systems, most of them including voltage and current instrument transformers. Inductive current transformers have two sets of windings, one supplying information to the control and protection units, while a second one is reserved to transactions mediated by the energy meters. The advent of synchronized measurements and the need of complex, fast and accurate control algorithms in smart grids, there is less and less difference among the use of measurement information. In this paper we investigate the use of measurement data from protection windings of current instrument transformers as input for steady-state control loops. Several examples show that the quality of such measurements is compatible with that of data quality obtained from the measurement windings of same instrument transformers.

ACS Style

Hariss Nicorescu; Mircea Eremia; Mihaela Albu. On the Impact of Winding Selection of Current Instrument Transformers for PMU Measurements. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) 2019, 1 -4.

AMA Style

Hariss Nicorescu, Mircea Eremia, Mihaela Albu. On the Impact of Winding Selection of Current Instrument Transformers for PMU Measurements. 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). 2019; ():1-4.

Chicago/Turabian Style

Hariss Nicorescu; Mircea Eremia; Mihaela Albu. 2019. "On the Impact of Winding Selection of Current Instrument Transformers for PMU Measurements." 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE) , no. : 1-4.

Journal article
Published: 03 December 2018 in Energies
Reads 0
Downloads 0

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 November 2018 in 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Reads 0
Downloads 0

While it has always been true that measurements are made to guide decision-making, there is abundant evidence that not all measurement results are meaningful. We give examples of fully-functional, tested and trusted measurement systems producing nonsensical results. A common characteristic of such systems is they are designed without a clear understanding of the purpose or context of the measurements. To help ensure measurements are designed and used fit for the intended purpose, we propose that, in addition to the appropriate instrumentation, technology, and techniques, all engineering and science students be taught the basics of measurement theory and an overview of measurement infrastructure. We estimate that this can be accomplished in a single semester course. Essential and important elements of the syllabus are considered.

ACS Style

H. Kirkham; Mihaela Albu; M. Engels; G. Frigo; A. Hedayatipour; David Laverty; A. Von Meier; A. Riepnieks; D.R. White; Z-M Yang. Teaching Measurement Fundamentals. 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) 2018, 1 -4.

AMA Style

H. Kirkham, Mihaela Albu, M. Engels, G. Frigo, A. Hedayatipour, David Laverty, A. Von Meier, A. Riepnieks, D.R. White, Z-M Yang. Teaching Measurement Fundamentals. 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON). 2018; ():1-4.

Chicago/Turabian Style

H. Kirkham; Mihaela Albu; M. Engels; G. Frigo; A. Hedayatipour; David Laverty; A. Von Meier; A. Riepnieks; D.R. White; Z-M Yang. 2018. "Teaching Measurement Fundamentals." 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) , no. : 1-4.

Journal article
Published: 26 September 2018 in IEEE Transactions on Instrumentation and Measurement
Reads 0
Downloads 0

The parameters of the transmission lines are used in several monitoring and control tools of the power system control center. An accurate knowledge of the power system model (including transmission lines impedances) impacts positively the situational awareness of the power system operators. It also improves the protection and corrective measures that may be applied in case of a disturbance. Nevertheless, line parameters that are stored in the control center database are typically subjected to errors, and therefore it is necessary to regularly refine them. The presence of a phasor measurement unit (PMU) at both ends of the transmission line allows the calculation of the transmission line parameters using synchronized current and voltage phasor measurements. Although the use of PMU measurements is a straightforward way to calculate the transmission line parameters, the uncertainty of the synchronized phasor measurements should be incorporated to the calculated transmission line parameter values. In this paper, an analytical expression for the bounds of the calculated transmission line parameters from PMU measurements is derived, considering both instrument transformers and PMU errors. The calculated bounds of uncertainty are evaluated through Monte Carlo simulations, while the importance of knowing the bounds of the calculated line parameters is underlined through the derivation of power-voltage curves considering the lower and upper bounds of the parameters. The simulation results are obtained using the IEEE 14-bus system.

ACS Style

Markos Asprou; Elias Kyriakides; Mihaela Albu. Uncertainty Bounds of Transmission Line Parameters Estimated From Synchronized Measurements. IEEE Transactions on Instrumentation and Measurement 2018, 68, 2808 -2818.

AMA Style

Markos Asprou, Elias Kyriakides, Mihaela Albu. Uncertainty Bounds of Transmission Line Parameters Estimated From Synchronized Measurements. IEEE Transactions on Instrumentation and Measurement. 2018; 68 (8):2808-2818.

Chicago/Turabian Style

Markos Asprou; Elias Kyriakides; Mihaela Albu. 2018. "Uncertainty Bounds of Transmission Line Parameters Estimated From Synchronized Measurements." IEEE Transactions on Instrumentation and Measurement 68, no. 8: 2808-2818.

Conference paper
Published: 01 June 2018 in 2018 IEEE International Energy Conference (ENERGYCON)
Reads 0
Downloads 0

The last decade marked an exponential increase in photovoltaic (PV) systems installed on the rooftop of domestic residences within Europe. This situation was basically favored by generous financial schemes such as Feed-in-Tariff and the market of green certificates. However, such governmental incentives drastically reduced, or they were already replaced with net-metering schemes which favor different scenarios: increase of self-consumption and decrease of grid-back injections. This unstable regulatory environment puts both new and old owners of PV systems under a regulatory financial risk. Recently, a regulatory resilient architecture, called UniRCon, was proposed, to overcome both financial and technical regulation uncertainties, where local battery energy storage system plays a key role. Besides the architecture we propose a real-time energy management system (EMS) that could be used for the daily operation of such systems. The real-time EMS is needed to prove the feasibility of this solution in short and long run and it could be also used as the main subroutine in the financial risk analysis. The EMS is based on a mixed-integer linear programming energy management tool that considers possible arbitrage benefits due to price difference in the energy purchased from the grid, while explicitly considering the efficiency of the power electronic interfaces (converters) according to the operation point. We prove our approach using a lab-scale experimental setup of a DC residential microgrid. The results are analyzed under realistic operation scenarios derived from one-year load and PV power output measurements.

ACS Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Enrique Rodriguez Diaz; Josep Guerrero; Juan C. Vasquez. Real-time optimal scheduling for prosumers resilient to regulatory changes. 2018 IEEE International Energy Conference (ENERGYCON) 2018, 1 -6.

AMA Style

Irina Ciornei, Mihaela Albu, Mihai Sanduleac, Enrique Rodriguez Diaz, Josep Guerrero, Juan C. Vasquez. Real-time optimal scheduling for prosumers resilient to regulatory changes. 2018 IEEE International Energy Conference (ENERGYCON). 2018; ():1-6.

Chicago/Turabian Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Enrique Rodriguez Diaz; Josep Guerrero; Juan C. Vasquez. 2018. "Real-time optimal scheduling for prosumers resilient to regulatory changes." 2018 IEEE International Energy Conference (ENERGYCON) , no. : 1-6.

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)
Reads 0
Downloads 0

Microgrids, storage technologies and renewables are cited as viable options to address resilience challenges faced by the power grids due to natural or man-made disasters. They are also cited as enablers for the recent research interest in low voltage DC microgrids. In this work, an architecture of a resilient small community of microgrids is presented. Furthermore, a distributed and adaptive energy management system is proposed for the tertiary power flow control of a small cluster of DC microgrids, that operate in a cooperative manner to achieve a high level of independence and resilience. To do this, each microgrid accepts to share its storage and generation resources either for economic reasons or for security in case of emergency situations. The proposed EMS replaces the conventional tertiary control that adjusts the power set points of the microgrids' cluster with a cooperative-based power exchange regulator. The model is based on a general-consensus problem and by making use of modern stochastic optimization techniques, such as stochastic-adaptive mixed integer programming. On the physical layer, where the actual commands are sent from the EMS layer to each power flow converter, an exchange of data occurs only with its neighboring converters (adjacent nodes). This is modeled as a sparse communication graph spanned across the microgrids' cluster.

ACS Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Enrique Rodriguez-Diaz; Remus Teodorescu; Josep Guerrero. Adaptive Distributed EMS for Small Clusters of Resilient LVDC Microgrids. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2018, 1 -6.

AMA Style

Irina Ciornei, Mihaela Albu, Mihai Sanduleac, Enrique Rodriguez-Diaz, Remus Teodorescu, Josep Guerrero. Adaptive Distributed EMS for Small Clusters of Resilient LVDC Microgrids. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). 2018; ():1-6.

Chicago/Turabian Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Enrique Rodriguez-Diaz; Remus Teodorescu; Josep Guerrero. 2018. "Adaptive Distributed EMS for Small Clusters of Resilient LVDC Microgrids." 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) , no. : 1-6.

Conference paper
Published: 01 May 2018 in 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
Reads 0
Downloads 0

The words “true value” assume an existential relationship with the thing being measured. There is assumed (by the speaker of the words) to exist some aspect of the thing being measured that is independent of its relationship to the person who is interested in the result of the measurement. Yet measurement is a response to the need of an observer to know something about the real world. There is therefore an epistemological aspect to measurement. Some aspect of measurement has to do with the observer as a knower of the result of the measurement. The paper considers electrical measurement. It proposes that these relationships correspond to two distinct kinds of measurement: one has the characteristic that there does exist such a thing as a true value, though it cannot be known: in the other kind, no such thing as true value even exists. The notion of true value is very useful, and for the kind of measurement where such a thing does not exist, the paper defines an alternative that has the advantage that it can actually be known under some circumstances in calibration.

ACS Style

H. Kirkham; A. Riepnieks; Mihaela Albu; David Laverty. The nature of measurement, and the true value of a measured quantity. 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) 2018, 1 -6.

AMA Style

H. Kirkham, A. Riepnieks, Mihaela Albu, David Laverty. The nature of measurement, and the true value of a measured quantity. 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). 2018; ():1-6.

Chicago/Turabian Style

H. Kirkham; A. Riepnieks; Mihaela Albu; David Laverty. 2018. "The nature of measurement, and the true value of a measured quantity." 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) , no. : 1-6.

Journal article
Published: 23 November 2017 in Energies
Reads 0
Downloads 0

Technological developments are pushing for new solutions based upon massive integration of renewable electricity generation in networks already facing many challenges. This paper presents a novel approach to managing the energy transfer towards prosumers making use of smart management of local energy storage. The proposed design (including storage dimensioning) is based on several operating scenarios in which the prosumer might operate as: (i) a “load only” entity (from a grid perspective), thus exhibiting investment resiliency against regulatory changes and high energy efficiency; or (ii) a prosumer, in case regulatory opportunistic profit might be available. This can be realized within a newly proposed Uni-directional Resilient Consumer (UniRCon) architecture. The major aim of the proposed architecture is to achieve optimal self-consumption while avoiding curtailment even in a changing regulatory environment like, for example, the total lack of incentives for generation based on renewable energy sources (RES). One of the major advantages of the proposed architecture consists in the adaptability to changes in the regulatory and market environment. The term resilience is used with multiple meanings: (a) the prosumer’s financial resilience against regulatory changes when investment calculations assume no-grid injections; (b) the prosumer’s technical resilience, with electrical design based on standalone operation; (c) the resilience of clusters of interconnected end-user installations with enabled community-level electricity exchange, independent of the existing main grid supply; (d) the contribution to grid resilience, by enabling AC microgrid (MG) operation in island mode when large portions of the grid are formed by clusters of UniRCon prosumers (the ease of islanding segmentation of the local grid in case of emergencies). For proof of concept, three use-cases are detailed: (i) photovoltaic (PV) installations connected behind the meter; (ii) PV and storage available and controllable behind the meter; and (iii) the UniRCon architecture. The three use-cases are then compared and assessed for four near-future timelines as starting points for the investment. Numerical simulations show the attractiveness of the UniRCon solution in what concerns both system operation costs and supply resilience. Savings are expressed as opportunity savings arising from difference in tariffs while charging and discharging the storage unit and due to the avoidance of curtailment, as well as special taxes for the connection of PV (depending on regulatory environment). An extension of the UniRCon concept is presented also at community scale, with neighbourhood energy exchange inside a resilient cluster.

ACS Style

Mihai Sanduleac; Irina Ciornei; Mihaela Albu; Lucian Toma; Marta Sturzeanu; João F. Martins. Resilient Prosumer Scenario in a Changing Regulatory Environment—The UniRCon Solution. Energies 2017, 10, 1941 .

AMA Style

Mihai Sanduleac, Irina Ciornei, Mihaela Albu, Lucian Toma, Marta Sturzeanu, João F. Martins. Resilient Prosumer Scenario in a Changing Regulatory Environment—The UniRCon Solution. Energies. 2017; 10 (12):1941.

Chicago/Turabian Style

Mihai Sanduleac; Irina Ciornei; Mihaela Albu; Lucian Toma; Marta Sturzeanu; João F. Martins. 2017. "Resilient Prosumer Scenario in a Changing Regulatory Environment—The UniRCon Solution." Energies 10, no. 12: 1941.

Conference paper
Published: 01 October 2017 in CIRED - Open Access Proceedings Journal
Reads 0
Downloads 0

Full text loading... /deliver/fulltext/oap-cired/2017/1/OAP-CIRED.2017.0791.html;jsessionid=4d5ioiaodau1w.x-iet-live-01?itemId=%2fcontent%2fjournals%2f10.1049%2foap-cired.2017.0791&mimeType=html&fmt=ahah

ACS Style

Dorel Stanescu; Dumitru Federenciuc; Mihaela Albu; Stefan Gheorghe; Doina Ilisiu; Carmen Stanescu. Performance standards applied to Romanian TSO and DSO. CIRED - Open Access Proceedings Journal 2017, 2017, 796 -799.

AMA Style

Dorel Stanescu, Dumitru Federenciuc, Mihaela Albu, Stefan Gheorghe, Doina Ilisiu, Carmen Stanescu. Performance standards applied to Romanian TSO and DSO. CIRED - Open Access Proceedings Journal. 2017; 2017 (1):796-799.

Chicago/Turabian Style

Dorel Stanescu; Dumitru Federenciuc; Mihaela Albu; Stefan Gheorghe; Doina Ilisiu; Carmen Stanescu. 2017. "Performance standards applied to Romanian TSO and DSO." CIRED - Open Access Proceedings Journal 2017, no. 1: 796-799.

Conference paper
Published: 01 October 2017 in 2017 International Conference on ENERGY and ENVIRONMENT (CIEM)
Reads 0
Downloads 0

The paper analyses energy production and consumption recorded for the Romanian power system in selected days and shows how storage resources can mitigate situations with 100% CO 2 free and 100% RES respectively, by simulating through scaling the production based on these new scenarios. The study assumes a similar power exchange with neighbors, to avoid drastic network reinforcement and to improve regional auto-consumption, thus improving resilience. Based on the studied days, the storage level, needed to maintain acceptable tie-lines cumulated power exchanges, is analyzed in terms of KPIs such as the total need of storage capacity in GWh, the power to energy ratio, and PV power to storage energy ratio. The results suggest similar requirements with the today trends in PV and storage pairing, thus inferring the feasibility of 100% CO 2 as well as 100% RES in the Romanian power system as being possible from the energy balancing point of view.

ACS Style

Mihai Sanduleac; Lucian Toma; Constantin Bulac; Mircea Eremia; Nicolae Golovanov; Radu Porumb; Mihaela Albu; Stefan Gheorghe; Catalin Chimirel. Energy storage for reaching 100% CO2 free and 100% RES — preliminary case study for Romania. 2017 International Conference on ENERGY and ENVIRONMENT (CIEM) 2017, 16 -20.

AMA Style

Mihai Sanduleac, Lucian Toma, Constantin Bulac, Mircea Eremia, Nicolae Golovanov, Radu Porumb, Mihaela Albu, Stefan Gheorghe, Catalin Chimirel. Energy storage for reaching 100% CO2 free and 100% RES — preliminary case study for Romania. 2017 International Conference on ENERGY and ENVIRONMENT (CIEM). 2017; ():16-20.

Chicago/Turabian Style

Mihai Sanduleac; Lucian Toma; Constantin Bulac; Mircea Eremia; Nicolae Golovanov; Radu Porumb; Mihaela Albu; Stefan Gheorghe; Catalin Chimirel. 2017. "Energy storage for reaching 100% CO2 free and 100% RES — preliminary case study for Romania." 2017 International Conference on ENERGY and ENVIRONMENT (CIEM) , no. : 16-20.

Conference paper
Published: 01 September 2017 in 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)
Reads 0
Downloads 0

The Network Code on Requirements for Generators, known also as RfG, is the most recent document approved by the European Commission that recommends the technical conditions for connection and operation of all types of generators in the ENTSO-E zone. Although RfG was published in the Official EU Journal in 2016, each EU member country is responsible to adopt it in the form that best suits to its characteristics. Therefore, the latest achievements in deployment of storage and renewables technologies should be also considered. Moreover, the new concepts included in the EU winter package (2016) for empowering the citizen and encouraging prosumer's self-consumption, resilience and efficiency requires careful analysis of the document. This paper aims at identifying some shortcomings of the proposed document, based on latest technology advancements and societal aspirations, and proposes a new approach that allows synchronizing the new network codes with the smart grids paradigm shift.

ACS Style

Mihai Sanduleac; Lucian Toma; Gianfranco Chicco; Mihaela Albu. Network code on requirements for generators — A discussion. Resynchronizing with paradigm shifts. 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) 2017, 1 -6.

AMA Style

Mihai Sanduleac, Lucian Toma, Gianfranco Chicco, Mihaela Albu. Network code on requirements for generators — A discussion. Resynchronizing with paradigm shifts. 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). 2017; ():1-6.

Chicago/Turabian Style

Mihai Sanduleac; Lucian Toma; Gianfranco Chicco; Mihaela Albu. 2017. "Network code on requirements for generators — A discussion. Resynchronizing with paradigm shifts." 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) , no. : 1-6.

Conference paper
Published: 01 June 2017 in 2017 IEEE Manchester PowerTech
Reads 0
Downloads 0

Power quality related to DC microgrids is still on virgin grounds of research. However, it may play an important role both in the design stage and on the DC microgrid control scheme to be adopted. Currently there is no comprehensive, quantitative and qualitative analysis on which of the power quality features are the most stringent constraints to be taken into account. This work is an attempt of defining and quantifying a set of power quality indices for DC microgrids. We relate our analysis on the design aspects of DC/DC power converters that are the most critical elements interfacing sources and loads in a stand-alone low voltage DC microgrid.

ACS Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Lenos Hadjidemetriou; Elias Kyriakides. Analytical derivation of PQ indicators compatible with control strategies for DC microgrids. 2017 IEEE Manchester PowerTech 2017, 1 -6.

AMA Style

Irina Ciornei, Mihaela Albu, Mihai Sanduleac, Lenos Hadjidemetriou, Elias Kyriakides. Analytical derivation of PQ indicators compatible with control strategies for DC microgrids. 2017 IEEE Manchester PowerTech. 2017; ():1-6.

Chicago/Turabian Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Lenos Hadjidemetriou; Elias Kyriakides. 2017. "Analytical derivation of PQ indicators compatible with control strategies for DC microgrids." 2017 IEEE Manchester PowerTech , no. : 1-6.

Conference paper
Published: 01 June 2017 in 2017 IEEE Second International Conference on DC Microgrids (ICDCM)
Reads 0
Downloads 0

Low voltage direct current microgrids are seen as key components of the future smart grids together with their AC counterparts. In the analysis of such microgrids the loads are modelled most of the times as constant power loads (CPL). This paper proposes a quantification of the flexibility introduced by several DC loads, generally available in low voltage DC microgrids as in-use appliances. The analysis is based on a power flow formulation that takes into account the droop control coefficients and that includes the actual non-linear characteristics of such loads. The models we use for the flexible DC loads were experimentally derived through a measurement scenario built on steady-state time intervals of 10s.

ACS Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Andres Felipe Martinez Palomino. Power flow formulation for LVDC microgrids with nonlinear load models. 2017 IEEE Second International Conference on DC Microgrids (ICDCM) 2017, 445 -451.

AMA Style

Irina Ciornei, Mihaela Albu, Mihai Sanduleac, Andres Felipe Martinez Palomino. Power flow formulation for LVDC microgrids with nonlinear load models. 2017 IEEE Second International Conference on DC Microgrids (ICDCM). 2017; ():445-451.

Chicago/Turabian Style

Irina Ciornei; Mihaela Albu; Mihai Sanduleac; Andres Felipe Martinez Palomino. 2017. "Power flow formulation for LVDC microgrids with nonlinear load models." 2017 IEEE Second International Conference on DC Microgrids (ICDCM) , no. : 445-451.