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Many photovoltaic (PV) parks suffer from a decrement in their generated power capability due to a phenomenon called potential induced degradation (PID). In this paper, a regenerative system using a high step-up DC–DC converter is proposed, for regenerating PV cells that have been degraded due to the PID effect. The same device also can be used for artificially creating PID on PV panels in order to study the effects of the PID under controlled conditions. The power converter offers multiple voltage levels at the output to adapt to various voltage ratings of PV parks. The device has plug-and-play features, ultra-low cost, small size and is simple in operation. Experimental tests are conducted in real PV panels and comparative results verify the operational principles of the proposed system. The artificial creation of the PID phenomenon and the regeneration of the PV cells are successfully proven experimentally.
Alex Mirtchev; Theodoros Mouselinos; Stylianos Syrigos; Emmanuel Tatakis. Behavioral Analysis of Potential Induced Degradation on Photovoltaic Cells, Regeneration and Artificial Creation. Energies 2021, 14, 3899 .
AMA StyleAlex Mirtchev, Theodoros Mouselinos, Stylianos Syrigos, Emmanuel Tatakis. Behavioral Analysis of Potential Induced Degradation on Photovoltaic Cells, Regeneration and Artificial Creation. Energies. 2021; 14 (13):3899.
Chicago/Turabian StyleAlex Mirtchev; Theodoros Mouselinos; Stylianos Syrigos; Emmanuel Tatakis. 2021. "Behavioral Analysis of Potential Induced Degradation on Photovoltaic Cells, Regeneration and Artificial Creation." Energies 14, no. 13: 3899.
During the last decade, the technologies related to electric vehicles (EVs) have captured both scientific and industrial interest. Specifically, the subject of the smart charging of EVs has gained significant attention, as it facilitates the managed charging of EVs to reduce disturbances to the power grid. Despite the presence of an extended literature on the topic, the implementation of a framework that allows flexibility in the definition of the decision-making objectives, along with user-defined criteria is still a challenge. Towards addressing this challenge, a framework for the smart charging of EVs is presented in this paper. The framework consists of a heuristic algorithm that facilitates the charge scheduling within a charging station (CS), and the analytic hierarchy process (AHP) to support the driver of the EV selecting the most appropriate charging station based on their needs of transportation and personal preferences. The communications are facilitated by the Open Platform Communications–Unified Architecture (OPC–UA) standard. For the selection of the scheduling algorithm, the genetic algorithm and particle swarm optimisation have been evaluated, where the latter had better performance. The performance of the charge scheduling is evaluated, in various charging tasks, compared to the exhaustive search for small problems.
Nikolaos Milas; Dimitris Mourtzis; Emmanuel Tatakis. A Decision-Making Framework for the Smart Charging of Electric Vehicles Considering the Priorities of the Driver. Energies 2020, 13, 6120 .
AMA StyleNikolaos Milas, Dimitris Mourtzis, Emmanuel Tatakis. A Decision-Making Framework for the Smart Charging of Electric Vehicles Considering the Priorities of the Driver. Energies. 2020; 13 (22):6120.
Chicago/Turabian StyleNikolaos Milas; Dimitris Mourtzis; Emmanuel Tatakis. 2020. "A Decision-Making Framework for the Smart Charging of Electric Vehicles Considering the Priorities of the Driver." Energies 13, no. 22: 6120.
This paper deals with the interconnection of a small wind turbine with the low voltage distribution grid and the implementation of an improved control scheme, which also serves educational purposes. Initially the subsystems—wind turbine, rectifying bridge, interleaved boost converter, three-phase inverter, interconnection inductors, lifting transformer, filtering capacitors—are investigated, in order to explain their selection, based on the LEMEC (Laboratory of Electromechanical Energy Conversion, Department of Electrical Engineering, UoP) educational policy. Afterwards, the three-phase inverter control scheme, which is responsible for controlling its input voltage (voltage of the DC Bus) and consequently the active power, as well as the reactive power injected into the grid (VQ control) is analyzed. This is accomplished through DQ transformation and PI controllers which are responsible for generating the appropriate reference signals, to generate the required Space Vector Pulse Width Modulation (SVPWM) pulses to drive the semiconductor switches of the inverter. In addition, it is explained how this particular control method can compensate reactive power in the grid, even in apnea, by automatically charging the DC Bus. Finally, simulation and experimental results are given to prove the proposed control method effectiveness.
Theofilos Papadopoulos; Emmanuel Tatakis; Efthymios Koukoulis. Improved Active and Reactive Control of a Small Wind Turbine System Connected to the Grid. Resources 2019, 8, 54 .
AMA StyleTheofilos Papadopoulos, Emmanuel Tatakis, Efthymios Koukoulis. Improved Active and Reactive Control of a Small Wind Turbine System Connected to the Grid. Resources. 2019; 8 (1):54.
Chicago/Turabian StyleTheofilos Papadopoulos; Emmanuel Tatakis; Efthymios Koukoulis. 2019. "Improved Active and Reactive Control of a Small Wind Turbine System Connected to the Grid." Resources 8, no. 1: 54.
The issue of calculating the energy saving amount due to regenerative braking implementation in modern AC and DC drives is of great importance, since it will decide whether this feature is cost effective. Although several works have been presented in this subject, they are concentrated on the case of electric vehicles because of the higher energy amounts or the need for more extended autonomy. However, as the increase of the electric energy cost at the Hellenic industrial sector, the need for advanced energy saving techniques emerged in order to cut down operational costs. To this direction, this paper presents a theoretical, simulation and experimental investigation on the quantization of energy recovery due to regenerative braking application in industrial rotating loads. The simulation and the experimental processes evaluate the theoretical calculations, where it is highlighted that annual energy saving may become higher than 10% even for small industrial loads, making the implementation of commercial regenerative braking units rather attractive. Finally, a power electronic conversion scheme is proposed for the storage/exploitation of the recovered energy amount.
Nick Papanikolaou; John Karatzaferis; Michael Loupis; Emmanuel Tatakis. Theoretical and Experimental Investigation of Brake Energy Recovery in Industrial Loads. Energy and Power Engineering 2013, 05, 459 -473.
AMA StyleNick Papanikolaou, John Karatzaferis, Michael Loupis, Emmanuel Tatakis. Theoretical and Experimental Investigation of Brake Energy Recovery in Industrial Loads. Energy and Power Engineering. 2013; 05 (07):459-473.
Chicago/Turabian StyleNick Papanikolaou; John Karatzaferis; Michael Loupis; Emmanuel Tatakis. 2013. "Theoretical and Experimental Investigation of Brake Energy Recovery in Industrial Loads." Energy and Power Engineering 05, no. 07: 459-473.
Power factor correction is a major issue for all industries, since a typical industrial load is causing current delays, as well as higher order current harmonics. Power factor correction is often mandatory from the power companies, usually by charging the reactive power that the company consumes. Many solutions for power factor correction have been presented in the bibliography; in this paper, the most significant power factor correction topologies will be reviewed and simulated with SABER RD software. Finally, a prototype design will be presented, based on a mass/cost analysis of the selected topologies and with an aim to manufacture 10 kW modules. The main outcome of this work is the feasibility for an SME to manufacture a competitive modular power factor correction product for industrial applications.
John Karatzaferis; Nick Papanikolaou; Emmanuel Tatakis; Michael Loupis; John Spanoudakis. Comparison and Evaluation of Power Factor Correction Topologies for Industrial Applications. Energy and Power Engineering 2013, 05, 401 -410.
AMA StyleJohn Karatzaferis, Nick Papanikolaou, Emmanuel Tatakis, Michael Loupis, John Spanoudakis. Comparison and Evaluation of Power Factor Correction Topologies for Industrial Applications. Energy and Power Engineering. 2013; 05 (06):401-410.
Chicago/Turabian StyleJohn Karatzaferis; Nick Papanikolaou; Emmanuel Tatakis; Michael Loupis; John Spanoudakis. 2013. "Comparison and Evaluation of Power Factor Correction Topologies for Industrial Applications." Energy and Power Engineering 05, no. 06: 401-410.
An innovative design methodology that optimizes the weighted efficiency of a single-phase, single-stage flyback inverter for ac-photovoltaic (PV) module applications is proposed. This novel approach combines the essential advantages of the flyback topology with high-efficiency design in the direction of a reliable, cost-effective, and high-performance PV system. The proposed methodology focuses exclusively on choosing the inverter design parameters, taking into consideration the PV module characteristics and the topology operation constraints. In order to meet this goal, an analytical losses calculation should be performed. Since the problem is complicated, special effort is given to manipulate the equations and variables in such a way to minimize the number of parameters. The proposed methodology is also verified experimentally.
Anastasios C. Nanakos; Emmanuel C. Tatakis; Nick P. Papanikolaou. A Weighted-Efficiency-Oriented Design Methodology of Flyback Inverter for AC Photovoltaic Modules. IEEE Transactions on Power Electronics 2012, 27, 3221 -3233.
AMA StyleAnastasios C. Nanakos, Emmanuel C. Tatakis, Nick P. Papanikolaou. A Weighted-Efficiency-Oriented Design Methodology of Flyback Inverter for AC Photovoltaic Modules. IEEE Transactions on Power Electronics. 2012; 27 (7):3221-3233.
Chicago/Turabian StyleAnastasios C. Nanakos; Emmanuel C. Tatakis; Nick P. Papanikolaou. 2012. "A Weighted-Efficiency-Oriented Design Methodology of Flyback Inverter for AC Photovoltaic Modules." IEEE Transactions on Power Electronics 27, no. 7: 3221-3233.