Michail Katsivelakis | University of Thessaly (original) (raw)

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Papers by Michail Katsivelakis

Research paper thumbnail of A Metaheuristics-Based Inputs Selection and Training Set Formation Method for Load Forecasting

Symmetry

Load forecasting is a procedure of fundamental importance in power systems operation and planning... more Load forecasting is a procedure of fundamental importance in power systems operation and planning. Many entities can benefit from accurate load forecasting such as generation companies, systems operators, retailers, prosumers, and others. A variety of models have been proposed so far in the literature. Among them, artificial neural networks are a favorable approach mainly due to their potential for capturing the relationship between load and other parameters. The forecasting performance highly depends on the number and types of inputs. The present paper presents a particle swarm optimization (PSO) two-step method for increasing the performance of short-term load forecasting (STLF). During the first step, PSO is applied to derive the optimal types of inputs for a neural network. Next, PSO is applied again so that the available training data is split into homogeneous clusters. For each cluster, a different neural network is utilized. Experimental results verify the robustness of the p...

Research paper thumbnail of Transient Stability Analysis in Power Systems Integrated with a Doubly-Fed Induction Generator Wind Farm

Renewable energy systems, especially wind turbines and farms are nowadays integrated rapidly into... more Renewable energy systems, especially wind turbines and farms are nowadays integrated rapidly into power systems and smart grids. Several technical challenges arise due to penetration of wind energy into power networks and systems. In order for system stability and steady state operation to be ensured in power systems and electric networks, steady and dynamic analysis are necessary. We study a standard IEEE 9 bus test system, which is integrated with a Doubly-Fed Induction Generator wind farm, aiming to examine its behaviour during disturbances. Steady state and transient stability configurations are proposed in order to analyze the system described. A threephase fault is suddenly applied to a load bus. Moreover, critical fault clearing time is identified for the corresponding three-phase fault and results show the maximum time for system stability during a disturbance. The influence of transient stability, including voltage stability, angle stability, active power and reactive power...

Research paper thumbnail of Techno-Economic Analysis of a Stand-Alone Hybrid System: Application in Donoussa Island, Greece

Energies

Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity i... more Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity in remote areas like islands and communities where grid extension is difficult. Hybrid systems combine renewable energy sources with conventional units and battery storage in order to provide energy in an off-grid or on-grid system. The purpose of this study is to examine the techno-economical feasibility and viability of a hybrid system in Donoussa island, Greece, in different scenarios. A techno-economic analysis was conducted for a hybrid renewable energy system in three scenarios with different percentages of adoption rate (20%, 50% and 100%)and with different system configurations. Using HOMER Pro software the optimal system configuration between the feasible configurations of each scenario was selected, based on lowest Net Present Cost (NPC), minimum Excess Electricity percentage, and Levelized Cost of Energy (LCoE). The results obtained by the simulation could offer some operationa...

Research paper thumbnail of Techno-Economic Analysis of a Stand-Alone Hybrid System: Application in Donoussa Island, Greece

Energies

Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity i... more Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity in remote areas like islands and communities where grid extension is difficult. Hybrid systems combine renewable energy sources with conventional units and battery storage in order to provide energy in an off-grid or on-grid system. The purpose of this study is to examine the techno-economical feasibility and viability of a hybrid system in Donoussa island, Greece, in different scenarios. A techno-economic analysis was conducted for a hybrid renewable energy system in three scenarios with different percentages of adoption rate (20%, 50% and 100%)and with different system configurations. Using HOMER Pro software the optimal system configuration between the feasible configurations of each scenario was selected, based on lowest Net Present Cost (NPC), minimum Excess Electricity percentage, and Levelized Cost of Energy (LCoE). The results obtained by the simulation could offer some operationa...

Research paper thumbnail of Transient Stability Analysis in IEEE 9-bus system integrated with a Doubly-Fed Induction Generator Wind Farm.

Renewable Energy Sources (RES) nowadays are integrated in a rapid way into power system and smart... more Renewable Energy Sources (RES) nowadays are integrated in a rapid way into power system and smart grids.Wind energy and in general RES penetration into power systems create several technical challenges and opportunities as well. In order the system stability and steady state operation to be ensured in power systems steady analysis and dynamic analysis are necessary. These configurations are applied in this study for load flow and transient stability analysis. IEEE 9-bus system is integrated with a Doubly-Fed Induction Generator Wind Farm and a three-phase fault is applied in a load bus. The aim and objective of this study is the behavior of IEEE 9-bus system with a DFIG Wind Farm during disturbances. Moreover critical fault clearing time is identified in this study for the corresponding three-phase fault. This study/work is conducted with the help of
PSS/E 34 software simulation tool of Siemens.

Research paper thumbnail of A Metaheuristics-Based Inputs Selection and Training Set Formation Method for Load Forecasting

Symmetry

Load forecasting is a procedure of fundamental importance in power systems operation and planning... more Load forecasting is a procedure of fundamental importance in power systems operation and planning. Many entities can benefit from accurate load forecasting such as generation companies, systems operators, retailers, prosumers, and others. A variety of models have been proposed so far in the literature. Among them, artificial neural networks are a favorable approach mainly due to their potential for capturing the relationship between load and other parameters. The forecasting performance highly depends on the number and types of inputs. The present paper presents a particle swarm optimization (PSO) two-step method for increasing the performance of short-term load forecasting (STLF). During the first step, PSO is applied to derive the optimal types of inputs for a neural network. Next, PSO is applied again so that the available training data is split into homogeneous clusters. For each cluster, a different neural network is utilized. Experimental results verify the robustness of the p...

Research paper thumbnail of Transient Stability Analysis in Power Systems Integrated with a Doubly-Fed Induction Generator Wind Farm

Renewable energy systems, especially wind turbines and farms are nowadays integrated rapidly into... more Renewable energy systems, especially wind turbines and farms are nowadays integrated rapidly into power systems and smart grids. Several technical challenges arise due to penetration of wind energy into power networks and systems. In order for system stability and steady state operation to be ensured in power systems and electric networks, steady and dynamic analysis are necessary. We study a standard IEEE 9 bus test system, which is integrated with a Doubly-Fed Induction Generator wind farm, aiming to examine its behaviour during disturbances. Steady state and transient stability configurations are proposed in order to analyze the system described. A threephase fault is suddenly applied to a load bus. Moreover, critical fault clearing time is identified for the corresponding three-phase fault and results show the maximum time for system stability during a disturbance. The influence of transient stability, including voltage stability, angle stability, active power and reactive power...

Research paper thumbnail of Techno-Economic Analysis of a Stand-Alone Hybrid System: Application in Donoussa Island, Greece

Energies

Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity i... more Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity in remote areas like islands and communities where grid extension is difficult. Hybrid systems combine renewable energy sources with conventional units and battery storage in order to provide energy in an off-grid or on-grid system. The purpose of this study is to examine the techno-economical feasibility and viability of a hybrid system in Donoussa island, Greece, in different scenarios. A techno-economic analysis was conducted for a hybrid renewable energy system in three scenarios with different percentages of adoption rate (20%, 50% and 100%)and with different system configurations. Using HOMER Pro software the optimal system configuration between the feasible configurations of each scenario was selected, based on lowest Net Present Cost (NPC), minimum Excess Electricity percentage, and Levelized Cost of Energy (LCoE). The results obtained by the simulation could offer some operationa...

Research paper thumbnail of Techno-Economic Analysis of a Stand-Alone Hybrid System: Application in Donoussa Island, Greece

Energies

Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity i... more Hybrid Renewable Energy Systems (HRES) are an attractive solution for the supply of electricity in remote areas like islands and communities where grid extension is difficult. Hybrid systems combine renewable energy sources with conventional units and battery storage in order to provide energy in an off-grid or on-grid system. The purpose of this study is to examine the techno-economical feasibility and viability of a hybrid system in Donoussa island, Greece, in different scenarios. A techno-economic analysis was conducted for a hybrid renewable energy system in three scenarios with different percentages of adoption rate (20%, 50% and 100%)and with different system configurations. Using HOMER Pro software the optimal system configuration between the feasible configurations of each scenario was selected, based on lowest Net Present Cost (NPC), minimum Excess Electricity percentage, and Levelized Cost of Energy (LCoE). The results obtained by the simulation could offer some operationa...

Research paper thumbnail of Transient Stability Analysis in IEEE 9-bus system integrated with a Doubly-Fed Induction Generator Wind Farm.

Renewable Energy Sources (RES) nowadays are integrated in a rapid way into power system and smart... more Renewable Energy Sources (RES) nowadays are integrated in a rapid way into power system and smart grids.Wind energy and in general RES penetration into power systems create several technical challenges and opportunities as well. In order the system stability and steady state operation to be ensured in power systems steady analysis and dynamic analysis are necessary. These configurations are applied in this study for load flow and transient stability analysis. IEEE 9-bus system is integrated with a Doubly-Fed Induction Generator Wind Farm and a three-phase fault is applied in a load bus. The aim and objective of this study is the behavior of IEEE 9-bus system with a DFIG Wind Farm during disturbances. Moreover critical fault clearing time is identified in this study for the corresponding three-phase fault. This study/work is conducted with the help of
PSS/E 34 software simulation tool of Siemens.