Engineering, Energy, Renewable Energy, Sustainability and the Environment
8
Scopus Publications
Scopus Publications
Low-Voltage ac and Low-Voltage dc Distribution Systems: An Assessment of Losses and Power Capacity considering the Penetration of Renewable Energy Sources Leonardo Nozari da Silva, Gustavo Scherer Djambolakdjian, Bruno Alves de Andrade, Cassiano Souza Krenn, Larissa Ananda Hansen, Daniel da Silva Gazzana, Renato Gonçalves Ferraz, Fábio Fedrizzi Vidor IEEE Industry Applications Magazine, 2024 The arguments regarding the usage of dc instead of its counterpart in ac have been discussed for a long time. Aiming for an efficient connection interface for the insertion of renewable energy sources (RESs) on the grid and the reduction of distribution losses, the employment of a low-voltage dc (LVdc) distribution system is considered in this study. For this purpose, the modification of an original low-voltage ac (LVac) distribution system to a dc one, without network rerouting and with minimal adaptations, is proposed. Both systems were implemented in the electric power open source distribution system simulator OpenDSS (open source code) and compared regarding their losses, energy transferred to the loads, voltage drops along the line as well as the number of conductors required for their operation. Moreover, different dc/ac conversion efficiency levels required by the penetration of solar photovoltaic (PV) systems as a RES on the grid were investigated, highlighting the discussion regarding the performance of operation modes.
Conversion of Wind Power Plants to Hybrid Power Plants Leonardo Nozari da Silva, Gustavo Scherer Djambolakdjian, Daniel da Silva Gazzana Proceedings 24th Eeeic International Conference on Environment and Electrical Engineering and 8th I and Cps Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2024, 2024 In recent years, the energy transition has imposed a diversity of energy generation sources on electrical systems, significantly expanding the role of renewable energy sources such as solar, wind, and hydroelectric power. However, the intermittent nature of these sources, reliant on external factors, poses challenges to their efficient integration into the grid. Consequently, there is often underutilization of the infrastructure installed for energy transmission. This research aims to address this challenge by evaluating the technical feasibility of repurposing existing wind power plants into hybrid facilities. By combining different energy sources at a single location, hybrid plants can potentially mitigate the intermittency issues associated with individual renewable sources. The proposed methodology involves the analysis of operational projects in Brazil, assessing their capacity for integrating complementary energy sources. Through this evaluation, this work seeks to identify opportunities for optimizing resource utilization and enhancing the overall efficiency of energy infrastructure. The findings reveal significant potential for the development of hybrid plants, indicating a promising avenue for maximizing renewable energy utilization and ensuring a more resilient and sustainable energy grid.
Techincal-Financial Assessentment of Offshore Wind Farm in Southern Brazil Gustavo Scherer Djambolakdjian, Leonardo Nozari da Silva, Daniel da Silva Gazzana Proceedings 24th Eeeic International Conference on Environment and Electrical Engineering and 8th I and Cps Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2024, 2024 Offshore wind energy has become a prominent contender in the global landscape of renewable energy generation. The increase in its penetration can be attributed to various factors, including the implementation of supportive energy policies, heightened environmental awareness, and remarkable technological progress. In this context, the paper aims to evaluate the wind potential in the southern region of Brazil based on a technical-financial analysis of an offshore wind farm project. The applied methodology is supported by a survey of wind data for the region, including the selection of wind turbine models and the estimation of the project costs, such as the capital expenditure (CAPEX) and operational expenditure (OPEX). The study is focused on the evaluation of different energy transmission technologies. The assessment reinforces that the region has significant potential for energy production. The methodology can serve as a basis for implementing future projects.
Impact of Distributed Energy Resources on Power Distribution Systems: A Simulation Study on Energy Transition Leonardo Nozari da Silva, Gustavo Scherer Djambolakdjian, Daniel da Silva Gazzana, Renato Gonçalves Ferraz, Fábio Fedrizzi Vidor Proceedings 2023 IEEE International Conference on Environment and Electrical Engineering and 2023 IEEE Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2023, 2023 Over the last years, the global electricity sector is facing an energy transition. This transformation deal with climate change, using low-carbon sources, electrification, and digitalization. In this context, the proposed study focuses on the impact of distributed energy resources (DERs), particularly renewable energy sources and storage, on power distribution systems. The computer simulation is a remarkable tool to understand the integration of DERs in the power system, mitigating the impacts of energy transition. The results of a trust and faithful simulation procedure can lead to more reliable, robust, and efficient systems, even for networks not originally designed for the consideration of technologies based on sustainable energy resources.
Underground Substation Grounding Evaluation Using the Average Potential Method Leonardo Nozari da Silva, Gustavo Scherer Djambolakdjian, Daniel da Silva Gazzana, Renato Goncalves Ferraz, Fabio Fedrizzi Vidor 2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2022, 2022 Electricity is an essential resource of modern life. The commitment to guarantee the supply of electricity to the populations, as well as the lack of space for the allocation of new substations in urban areas are challenges faced by the electricity distribution sector. In order to expand the number of substations to attend the demand, the solution has been to make them underground. For this purpose, this paper aims at evaluating the grounding system for an underground distribution substation using a modified average potential method to ensure the energy supply during faults, as well as to guarantee safety of people in the surroundings. The simulation results show that using the envelope of the substation as a grounding structure should be a promising alternative to dissipate short-circuit currents.
Assessment on Technical Impacts Regarding the Massive Penetration of Nanogrids in Electric Power Distribution Systems Daniel K. Oliveira, Gustavo S. Djambolakdjian, Leonardo N. Silva, Renato G. Ferraz, Fabio F. Vidor, Daniel S. Gazzana 2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2022, 2022 The adoption of nanogrids by electricity consumers has been increasing in many countries. Consumer units have been deploying small-scale renewable energy generation with or without energy storage systems (ESS). Electrical distribution system (EDS) operators will have to adapt their networks in order to fulfill the needs regarding a rising insertion of grids in nano scale. In this context, knowing the effects of a massive nanogrid penetration is fundamental for proper power system planning and operation. In the light of such need, this paper presents a methodology to model the massive integration of different nanogrid topologies into distribution systems. Considering seasonality and different penetration scenarios, nanogrids are allocated on a secondary distribution system which are connected to a primary system. Results show that the primary feeder may have a daily consumption reduction of up to 15% while its technical losses may decrease by 23 %.
A Numerical Comparative Study on Losses and Power Capacity in Low Voltage AC/DC Systems: a Philosophy Focused on Distributed Energy Resources Gustavo Scherer Djambolakdjian, Leonardo Nozari da Silva, Vanessa Dias de Moura, Arthur Luiz Klein, Renato Goncalves Ferraz, Daniel da Silva Gazzana, Fabio Fedrizzi Vidor 2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Systems Europe Eeeic I and Cps Europe 2022, 2022 This paper investigates the converting feasibility of low voltage alternating current (LVAC) networks into low voltage direct current (LVDC) counterpart. Addressing the insertion of distributed energy resources (DER) in the grid, in terms of electrical losses and power capacity, the work proposes a methodology supported by computational simulation aiming at the increase of the system efficiency. The study is conducted on a low voltage European residential network model, where the conventional LVAC and an equivalent LVDC topologies are confronted. Based on several scenarios, with and without the presence of DER in different penetration levels and also considering unbalanced loads, the DC configuration demonstrates to be an adequate interface for the insertion of DER, reducing losses and facilitating the integration of new resources. Corroborating with the well-known benefits assigned to the high voltage direct current systems (HVDC), the relevance of the investigation can be highlighted by the advantages observed also in low voltage level.
Line Losses and Power Capacity in Low Voltage AC and DC Distribution Systems: A Numerical Comparative Study Leonardo Nozari da Silva, Gustavo Scherer Djambolakdjian, Bruno Alves de Andrade, Cassiano Souza Krenn, Larissa Ananda Hansen, Daniel da Silva Gazzana, Renato Goncalves Ferraz, Fabio Fedrizzi Vidor 21st IEEE International Conference on Environment and Electrical Engineering and 2021 5th IEEE Industrial and Commercial Power System Europe Eeeic I and Cps Europe 2021 Proceedings, 2021 The insertion of renewable and distributed energy resources and the use reduction of fossil-fuel-based ones have been in the spotlight of studies of the scientific community in general. Aiming at an efficient connection interface for these resources and at the reduction of distribution losses, the employment of a Low Voltage Direct Current distribution system (LVDC) is considered in this study. For this purpose, the modification of a pristine Low Voltage Alternate Current distribution system (LVAC) to a DC one is proposed without network’s rerouting and with minimal adaptations. Both systems were implemented in the electric power distribution system simulator, OpenDSS (open-source code), and compared to their losses, energy transferred to the loads, voltage drops along the line, as well as number of conductors required for their operation.
