155-164

370

Improving the Voltage Stability of Distribution Network Using

Capacitor Banks and PV Arrays Based on Open DSS

Mohammed Qasim Majeed(1), Ali Jafer Mahdi(2), Manal Hussein Nawir(1)

1. Department of Electrical and Electronics Engineering, University of Karbala.

    Iraq

2. College of Information Technology Engineering,Al-Zahraa University for

    Women,Karbala. Iraq

Abstract

This study endeavors to enhance the voltage profile, mitigate energy losses, and narrow the gap between electricity generation and consumption in the Al-Gharab distribution network in Al-Qadisiyah, Iraq. The Al-Gharab radial distribution network is afflicted by voltage drops and fluctuations, frequent power interruptions, and power losses. The researchers are studying the potential of supporting the network with the Capacitor Banks (CBs) and incorporating Photovoltaic arrays (PV arrays) as a means of improving its performance...READ MORE

165-172

372

Measurement methods to assess conducted emissions in the

9-150 kHz range generated by photovoltaic installations

U. Txertudi, G. Txertudi, A. Gallarreta, M. Fernández, I. Fernández,

D. de la Vega

University of the Basque Country (UPV/EHU) Bilbao. Spain

Abstract

The increasing integration of inverter-based devices in the distribution grid is generating higher levels of conducted emissions in the 9-150 kHz range. The lack of standard measurement methods in this band has led to the development of new methods, which still require further evaluation. In this study, several measurement methods are analysed in the assessment of conducted emissions generated by a photovoltaic (PV) installation in the 9-150 kHz range...READ MORE

173-179

375

Short-term wind power forecasting with responses

transformation for taking into account wind turbine

operational state

D. Snegirev, A. Pazderin, V. Samoylenko, P. Bartolomey

Department of Automated Electrical Systems,

Ural Federal University, Yekaterinburg. Russia

Abstract

The amount of electricity production provided by wind farms is increasing globally. In this regard, the accurate and reliable wind power forecasting for ensuring efficient operation of wind farms as part of energy systems is becoming crucial issue. The most rarely considered among the possible methods for prediction errors reducing is changing of the prediction responses and the individual wind turbines power aggregation method: forecasting at the turbine level, at the groups of turbines and at the wind farm level...READ MORE

180-186

376

CAPEX and OPEX of floating offshore photovoltaic farms.

The case of study of the Mediterranean area of the Iberian

Peninsula

D. Cordal-Iglesias(1) , D. Fernández-Mira(2), A. Filgueira-Vizos(3),

T. Guillén-Díaz(4), I. Robalo-Cabrera(5), A. Alcayde(5), F.G. Montoya(5),

A.I. García-Diez (6), M.A. Graña-López(7), F. Puime-Guillén(8),

H. S. de Oliveira(9), L. Castro-Santos(10)

1.  Universidade da Coruña, Escola Politécnica de Enxeñaría de Ferrol. Spain

2.  Universidade da Coruña, Escola Universitaria de Deseño Industrial. Spain

3.  Universidade da Coruña. Centro de Investigación en Tecnoloxías Navais e

      Industriais (CITENI), Departamento de Química, Escola Politécnica de

      Enxeñaría de Ferrol. Spain

4.  Universidad Adolfo Ibáñez, Facultad de Ingeniería y Ciencias. Chile

5.  Universidad de Almería, Escuela Superior de Ingeniería. Spain

6.  Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

     Industriais (CITENI), Departamento de Enxeñaría

     Naval e Industrial, Escola Politécnica de Enxeñaría de Ferrol. Spain

7.  Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

      Industriais (CITENI), Departamento de Enxeñaría

     Industrial, Escola Politécnica de Enxeñaría de Ferrol, Esteiro. Spain

8.  Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

      Industriais (CITENI), Departamento de Empresa, Facultade de Economía e

      Empresa. Spain

9.   Instituto Superior de Contabilidade e Administração do Porto (ISCAP),

      CEOS.PP, University of Porto. Portugal

10. Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

      Industriais (CITENI), Departamento de Enxeñaría Naval e Industrial, Escola

      Politécnica de Enxeñaría de Ferrol. Spain

Abstract

The objective of this work is to determine the CAPEX and OPEX of a floating offshore photovoltaic farm. The case of study will analyse a particular floating offshore photovoltaic platform called Merganser and a possible location in the Mediterranean area of the Iberian Peninsula. Results will denote the best areas where this type of energy can be installed in relation to its costs...READ MORE

187-192

379

Methodology for Analysing the Social Cost of Energy (SCOE)

for a floating photovoltaic plant (FPV) in Spain

I. Robalo-Cabrera(1), A. Alcayde(2), A. Filgueira-Vizoso(3),

T. Guillén-Díaz(4), F.G. Montoya(2), L. Castro-Santos(1)

1. Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

    Industriais CITENI), Departamento de Enxeñaría Naval e Industrial, Escola

    Politécnica de Enxeñaría de Ferrol. Spain

2. Universidad de Almería, Escuela Superior de Ingeniería. Spain

3. Universidade da Coruña, Centro de Investigación en Tecnoloxías Navais e

    Industriais (CITENI), Departamento de Química, Escola Politécnica de

    Enxeñaría de Ferrol. Spain

4. Universidad Adolfo Ibáñez, Facultad de Ingeniería y Ciencias. Chile

Abstract

The growing need of the global society to harness renewable resources has resulted in a heightened curiosity to adopt innovative technologies in novel settings. An illustration of this phenomenon can be seen in offshore floating solar power facilities (FPV). As of August 2020, cumulative installed floating solar PV capacity was over 2 GW in 338 active projects and in 35 countries worldwide [1]. The rising interest in FPV is boosted by its decreasing LCOE (Levelized Cost of Energy), which refers to the estimated revenue required to build and operate a generator over a specified cost recovery period [2],...READ MORE

193-201

380

Five-phase Inverter Control Based on the Haar Wavelet

Transform

J. Iwaszkiewicz, A. Muc

Department of Ship Automation. Gdynia Maritime University. Poland

Abstract

The paper presents a novel five-phase cascade inverter control method based on the Haar wavelets transform. The inverter is built from two or three two level inverters in every phase. The instantaneous value of the output voltage of the cascaded inverter is composed as a synthesis of the selected Haar wavelets. An analytical system of determining the best possible set of Haar orthogonal wavelets is presented. On the basis of the applied Haar wavelets, the control signals of the inverter switches are calculated...READ MORE

202-209

385

Work accidents prevention by risks assessments to 400 kV

Tantareni power substation from Romania

Daniel N. Fîță(1), Florin Mureșan-Grecu(2), Adrian M. Schiopu(3)

1. Strategic Studies of Energy Security Research Center, University of Petrosani.

    Romania

2. Industrial Engineering Doctoral School, University of Petroșani. Romania

3. Strategic Studies of Energy Security European Center of Petrosani. Romania

Abstract

Based on the principles of prevention, the employer must seek to eliminate risk at source and, in order of priority, to replace hazards through non-dangers, to separate or isolate areas where there are hazards, ensuring adequate collective and individual protection. However, workers from high and very high voltage power substations continue to be exposed to occupational hazards, suffering accidents at work and occupational diseases with significant repercussions on their health, on colleagues or National Power System...READ MORE

210-216

386

Analysis of the National Power Grid from Romania

in the context of identifying vulnerabilities and

ensuring energy security

Daniel N. Fîță(1), Dan C. Petrilean(2), Ioan L. Diodiu(3)

1. Strategic Studies of Energy Security Research Center, University of Petrosani.

    Romania

2. Mechanical and Industrial Engineering, Transport Department, University of

    Petroșani. Romania

3. Computer Science and Electrical Engineering Department, University of Sibiu.

     Romania

Abstract

The National Power Grid is the most important national energy objective of strategic importance, having in its composition a multitude of critical infrastructures (power substations and overhead power lines of 400 kV and 220 kV) of national and european importance without which the economy and national well-being do not it could work. The proper functioning of all state mechanisms is ensured through the National Power Grid because all public systems are almost entirely dependent on electricity... READ MORE

217-224

391

Optimizing the utilisation of different computational

hardware types for real time simulation

D. Kiss, L. Stranyóczky, I. Varjasi Dr.

Department of Automation and Applied Informatics. Budapest

University of Technology and Economics. Faculty of Electrical Engineering

and Informatics. Hungary

Abstract

Development of power electronics devices have never been so widespread among different industries than today. Efficient power conversion, precise and efficient control of electrified actuator systems, and of course electric powertrains and electrical power generation is a challenge everywhere. The opportunities provided by Wide-bandgap semiconductor devices fuelling the innovation even further...READ MORE

225-232

394

Stable hydrogen generation by wind power, grid and battery

Rodolfo Dufo-López, Juan M. Lujano-Rojas, José L. Bernal-Agustín,

Jesús S. Artal-Sevil, Ángel A.Bayod-Rújula

Department of Electrical Engineering E.I.N.A., Zaragoza University. Spain

Abstract

In this work, we study the stable generation of hydrogen by means of the electrolyzer fed by renewable sources, battery and grid. Due to the intermittent nature of the renewable sources (PV, wind), the hydrogen generation by the electrolyzer cannot be stable during the time except if there is another electricity source to fulfil the difference between the electrolyzer nominal power and the renewable power. The AC electrical grid will supply that difference during hours when the electricity price is low, while the batteries will supply the difference when the electricity price is high...READ MORE

233-239

395

Short term energy management in stand-alone

PV-battery-diesel systems

Rodolfo Dufo-López, Juan M. Lujano-Rojas, José L. Bernal-Agustín,

Jesús S. Artal-Sevil, Ángel A. Bayod-Rújula, Juan A. Tejero-Gómez

Department of Electrical Engineering. E.I.N.A., Zaragoza University. Spain

Abstract

In this work, the short term (daily) operation of an off-grid hybrid PV-diesel-battery system is optimized by genetic algorithms. An integer variable (0, 1 or 2) for each hour of the day decides the way the battery works. With the forecast of the hourly irradiation, temperature and load consumption for the next day, and estimating the state of charge of the battery (SOC) at the first hour of the day, we perform the optimization of the integer variables for the 24 hours of next day...READ MORE

240-250

404

Wave power in the Mediterranean Sea

T. Soukissian(1), A. Lutard(2), N.E. Koutri(3)

1. Hellenic Centre of Marine Research – Institute of Oceanography Athens. Greece

2. University of Toulon. France

3. National Technical University of Athens – School of Naval Architecture and

    Marine Engineering. Greece

Abstract

In this work, the analysis of the wave energy flux and the identification of potential sites for future development of wave energy converters in the Mediterranean Sea, is presented. The most recent reanalysis wave dataset (MEDSEA_MULTIYEAR _WAV_006_012), from the platform of Copernicus Marine Service was used, featuring high spatial and temporal resolution (~3.5 km and 1 h, respectively). The study considered a time series of wave spectral parameters (significant wave height and mean energy period) of 27 – years (1993 – 2020) length, in order to estimate the trends and the variability of the wave energy flux in the Mediterranean basin...READ MORE

251-259

410

Conditions for the optimality of the criterion programming

problem and determination of basic parameters

of community power generation

Milan Belik(1),  Oleksandr Rubanenko(2)

1. Department of Power engineering, University of West Bohemia. Plzen.

Czech  Republic

2. Department of electric station and system, Vinnytsia. Ukraine

Abstract

The paper presents the application of the criterion programming problem and determination of its basic parameters to predict the behavior of an energy community in Ukraine during the war and post war restructure process.The main problem of the criterion programming is the implementation of renewable energy sources – especially grid-on photovoltaic hybrid system. The theoretical method starts from the basic equation of the criterion programing problem. The model is than developed with continuous indexing resulting to orthonormal equations. Next, the convexity of the function is analyzed and system of nonlinear equations is generated...READ MORE

411

260-268

Determination of conditions for the optimal power generation

PV system for energy community and citizen’s energy

in Ukraine by criterion programming method

Olena Rubanenko(1,2,3)

1. Research and Innovation Centre for Electrical Engineering, University of West

    Bohemia, Plzen. Czech Republic

2. Department of electric station and system, Vinnytsia. Ukraine

3. Department of Wind Energy, Institut of Renewable Energy, Kyiv, Ukraine.

Abstract

The paper presents the main benefits of the implementation of energy community, for example, Ukraine. The main expected issues of the creation of renewable energy sources for Ukrainian energy communities are highlighted. For finding of optimal condition of photovoltaic (PV) system operation is used criteria method. Design, simulation and improving of PV system and householder was in PV*SOL Premium. The paper considers the features of mathematical modeling of the optimal decision-making process in PV complex dynamical systems in terms of analysis and evaluation of their sensitivity. The perspective of the application of criterion modeling in problems of optimal control, in particular for the analysis of the sensitivity of optimal decisions, is shown...READ MORE

269-275

419

Virtualization in substations. Technologies and applications

E. Torres, P. Eguia, O. Abarrategi, D.M. Larruskain, V. Valverde, G. Buigues

Department of Electrical Engineering, School of Engineering of Bilbao,

University of the Basque Country UPV/EHU. Spain

Abstract

The application of digital technologies in electric substations will be a key driver to develop the green transition and leverage the benefits from a smarter power grid. One of those technologies is virtualization, widely used in IT. Substation virtualization will allow the development of more flexible and agile substations and will contribute to a more resilient grid. However, its application in substations poses several issues, as they are critical facilities with real time and high reliability operation requirements...READ MORE

276-282

422

Balcony solar photovoltaic plug-and-play systems

S. Seme(1,2), L. Strojanšek(1), E. Simonič(1), K. Sredenšek(1)

1. Faculty of Energy Technology, University of Maribor. Slovenia

2. Faculty of Electrical Engineering and Computer Science,

University of Maribor. Slovenia

Abstract

The paper presents balcony solar photovoltaic plug-and-play systems with a capacity of up to 600 W. Balcony solar photovoltaic plug-and-play systems up to 600 W are categorized under plug-in renewable energy production devices. The feasibility of investing in a balcony solar photovoltaic plug-and-play system was analyzed using 15-minute data on electricity consumption for various household consumers. Data on the power density of solar radiation obtained from the online archive of automatic weather stations of the Slovenian Environment Agency were used to calculate the anticipated electricity production of the balcony solar photovoltaic plug-and-play systems...READ MORE

283-291

431

Off-grid system using a converter with multiple DC inputs

and three-phase, multi-level AC output

Adam Muc

Department of Ship Automation, Gdynia Maritime University. Poland

Abstract

This paper describes the possibility of interfacing a three-phase voltage converter with a configurable DC input and a multi-level AC output with an on-grid system. The described converter uses magnetically coupled reactors. The multilevel output voltage of the converter is characterized by a favorable value of the THD coefficient. With the ability to configure DC inputs, the proposed converter allows easier integration of renewable energy installations, such as PV. A control strategy for the voltage inverter has been developed...READ MORE

292-299

434

Energy storage possibility for Energy Community

Péter Kádár, Norbert Boross

Óbuda University.  KVK Dept. of Power Systems, Alternative Energy

Sources Knowledge Centre. Budapest. Hungary

Abstract

Pilisszentlászló is a settlement of 1000 inhabitants in the Budapest agglomeration, in a hilly environment in Hungary. The municipality is committed to sustainability, including energy management. The village intends to establish an Energy Community, installing as many local small Photo Voltaic generation units as possible. Increasing the security of energy availability and energy storage were considered viable options. In this paper we investigate three possible and sustainable energy storage methods. We have also assessed the solutions by the life cycle analysis (LCA) approach, which examines the overall environmental impact instead of short-term financial aspects...READ MORE

300-307

435

Analysis of the operation of a Fresnel solar plant through

experimental tests: Energy production and efficiency

D. Larra, M.T. Miranda, I. Montero, F.J. Sepúlveda, J.I. Arranz

Departamento de Ingeniería Mecánica, Energética y de los Materiales,

Escuela de Ingenierías Industriales, Universidad de Extremadura. Badajoz. Spain

Abstract

There is currently a lack of information on the real performance of concentrating solar systems using Fresnel collectors. In order to promote the penetration of this technology in industrial facilities with thermal demand, numerous daily operational tests have been carried out in a 105.6 m2 Fresnel solar plant in southwest Spain. An analysis has been conducted covering all months of the year and including real direct radiation data...READ MORE

308-319

438

Efficiency Analysis of an Interleaved Converter as Power Interface

between a PEM Electrolyzer and a Photovoltaic Source

Gianpaolo Vitale

ICAR, Institute for high performance computing and networking,

National Research Council (CNR), Palermo. Italy

Abstract

This paper deals with the conversion efficiency of an interleaved six-legs DC/DC converter used as an interface between a photovoltaic source and an electrolyzer. Different configurations of the photovoltaic sources are analysed, varying the numbers of the operated legs of the converters. The efficiency is affected by the high current required by the electrolyzer; however, the analysis shows that the optimal configuration of the PV source and of the number of the converter’s operated legs can improve performance...READ MORE

320-325

442

Impact analysis of photovoltaic systems and energy

storage systems on a low-voltage distribution grid

E. Simonič(1), S. Seme(1,2), K. Zupanc(3), K. Sredenšek(1)

1. Faculty of Energy Technology, University of Maribor, Krško, Slovenia

2. Faculty of Electrical Engineering and Computer Science, University of Maribor,

    Maribor, Slovenia

3. Elektro Gorenjska, Slovenia

Abstract

The aim of this paper is to present an impact analysis of photovoltaic systems on a low-voltage distribution grid. It introduces simulation methodology of photovoltaic systems integration and their influence on grid voltage. Simulation results are given for a real low-voltage distribution grid feeder model. Furthermore, the study explores updating photovoltaic systems with energy storage systems, revealing beneficial effects of electricity storage...READ MORE