Papers by Stefan Gheorghe
IOP Conference Series: Earth and Environmental Science
Due to the increasing complexity of the global energy system and the amount of data transmitted b... more Due to the increasing complexity of the global energy system and the amount of data transmitted by smart devices, there is an urgent need to unlock smart technologies and sendees with investments on the scalability of computational resources. This objective can be achieved by means of a standardized software platform that can support interoperability and behave as the main vehicle for the rapid implementation of innovative energy sendees. One possibility to enhance computational power on demand is cloud computing, which forms the Internet of Things (IoT). In this work, a customizable open-source IoT platform setup using the FIWARE framework is deployed, which exploits the advantages for a smart energy domain. The term platform comprehends a set of software tools that allow quick integration of various devices. This study presents the implemented platform and analyses its functionality in different use cases on the European level.
Energy Informatics, 2021
In a modern smart energy system with increased penetration of renewable energy resources, the amo... more In a modern smart energy system with increased penetration of renewable energy resources, the amount of data from various sources is growing significantly. Such systems require complex algorithms and controlling on-demand. These requirements can be addressed with on-demand scalability and a stable system. Nowadays, on-demand scalability is achieved by considering cloud computing and Internet of Things (IoT) technologies. This paper presents a cloud-based platform based on service-oriented architecture to perform analyzes on smart energy system services. It is the result of the European FISMEP (FIWARE for Smart Energy Platform) project to demonstrate an information and communication technology (ICT) architecture for the smart energy sector. The presented architecture is powered by FIWARE, open-source and customizable building blocks for future internet applications and services. Furthermore, the feasibility of the architecture is evaluated using various test cases.
CIRED - Open Access Proceedings Journal, 2017
2017 International Conference on ENERGY and ENVIRONMENT (CIEM), Oct 1, 2017
The paper analyses energy production and consumption recorded for the Romanian power system in se... more 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% CO2 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% CO2 as well as 100% RES in the Romanian power system as being possible from the energy balancing point of view.
The power flow solution is one of the more significant issues in power systems. In this article w... more The power flow solution is one of the more significant issues in power systems. In this article we will describe a comparison between using of two tools for Power flow and Voltage analysis: program 1 and program 2. Our study case includes the results in the calculation of Power Flow and Voltage analysis in the nodes of High Voltage network. The power network has 13 nodes, 11 generators (Five generating units), 27 power transformers, from which 16 transformers are used as a loads, and the network operating at 10.5 kV up to 220 kV. The loads are depending on the voltage. The total losses in this network are calculated, and the level of voltages in all of nodes, calculated with both programs. Also, we do operate the power network in the best case in terms of Reduce losses in the network, taking into account the voltages regulation. The study is focused on the voltage control in the power network. Solutions for dynamic control of the voltage in power system are proposed in the paper.
2019 International Conference on ENERGY and ENVIRONMENT (CIEM)
The power flow solution is one of the more significant issues in power systems. In this article w... more The power flow solution is one of the more significant issues in power systems. In this article we will describe a comparison between using of two tools for Power flow and Voltage analysis: program 1 and program 2. Our study case includes the results in the calculation of Power Flow and Voltage analysis in the nodes of High Voltage network. The power network has 13 nodes, 11 generators (Five generating units), 27 power transformers, from which 16 transformers are used as a loads, and the network operating at 10.5 kV up to 220 kV. The loads are depending on the voltage. The total losses in this network are calculated, and the level of voltages in all of nodes, calculated with both programs. Also, we do operate the power network in the best case in terms of Reduce losses in the network, taking into account the voltages regulation. The study is focused on the voltage control in the power network. Solutions for dynamic control of the voltage in power system are proposed in the paper.
18th International Conference and Exhibition on Electricity Distribution (CIRED 2005), 2005
Two types of Power Quality Monitoring Systems (PQMSs) - one for TSO and other for DSOs, in accord... more Two types of Power Quality Monitoring Systems (PQMSs) - one for TSO and other for DSOs, in accordance with Performance standards and Technical Codes of the Romanian Energy Regulation Authority - ANRE were published. The connection to the grid of the renewable sources could determine the increasing of the emissivity of perturbations and the necessity of the propagation study in order to determine the level of the perturbation to the superior level of the voltage of network. The concept “One system for all PQ data” is a new direction used by TSO and DSOs for increasing the efficiency of the PQMS. The results of the monitoring using PQMS for a long period of time, in this paper, validated the expectations from the feasibility study in the design stage of PQMS and allowed the authors to look at some improvement directions of the system. The integration of PQMS with other systems - DMS, SCADA, DFR has been already solved in DSO and a higher efficiency has been achieved. The whole measurement chain in power distribution and transmission activities has been taken into consideration and the results have a good accuracy. Few recommendations are included in the paper. The final part of the paper contains the authors conclusions on issues addressed in it.
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Papers by Stefan Gheorghe