scholarly journals Sizing and operation of a pure renewable energy based electric system through hydrogen

2022 ◽  
Vol 8 ◽  
pp. 1391-1403
Author(s):  
Bei Li ◽  
Jiangchen Li
Keyword(s):  
Renewable Energy ◽  
Electric System

scholarly journals Holistic simulation of wind turbines with fully aero-elastic and electrical model

2021 ◽  
Author(s):  
Marcus Wiens ◽  
Sebastian Frahm ◽  
Philipp Thomas ◽  
Shoaib Kahn
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Elastic Model ◽  
Electrical Model ◽  
Holistic Model ◽  
Electric System ◽  
Electrical Components

AbstractRequirements for the design of wind turbines advance facing the challenges of a high content of renewable energy sources in the public grid. A high percentage of renewable energy weaken the grid and grid faults become more likely, which add additional loads on the wind turbine. Load calculations with aero-elastic models are standard for the design of wind turbines. Components of the electric system are usually roughly modeled in aero-elastic models and therefore the effect of detailed electrical models on the load calculations is unclear. A holistic wind turbine model is obtained, by combining an aero-elastic model and detailed electrical model into one co-simulation. The holistic model, representing a DFIG turbine is compared to a standard aero-elastic model for load calculations. It is shown that a detailed modelling of the electrical components e.g., generator, converter, and grid, have an influence on the results of load calculations. An analysis of low-voltage-ride-trough events during turbulent wind shows massive increase of loads on the drive train and effects the tower loads. Furthermore, the presented holistic model could be used to investigate different control approaches on the wind turbine dynamics and loads. This approach is applicable to the modelling of a holistic wind park to investigate interaction on the electrical level and simultaneously evaluate the loads on the wind turbine.

scholarly journals The Why of Adaptive Protections in Modern Electrical Networks

2019 ◽  
Vol 39 (2) ◽  
Author(s):  
Juan Martín Guardiola Montenegro ◽  
Eduardo Gómez Luna ◽  
Eduardo Marlés Sáenz ◽  
Jorge Armando De la Cruz Saavedra
Keyword(s):  
Renewable Energy ◽  
Distributed Generation ◽  
Renewable Resources ◽  
Harmonic Distortion ◽  
Distribution Networks ◽  
Electrical Networks ◽  
Dynamic Changes ◽  
Interconnected System ◽  
Electric System ◽  
Micro Grids

Electrical networks are evolving and taking on more challenges as the inclusion of renewable energy and distributed generation units increase, specially at distribution levels. Big trends of generating electricity with alternative and renewable resources has promoted the formation of distribution networks subsystems or micro grids, capable of supplying their own electric demand and to export energy to the interconnected system, if necessary. However, the effects of these generation units into the network and into the microgrid as well are many, as harmonic distortion, voltage flickers and especially in electrical protections.This paper provides an overview about implementation of renewable energy and distributed generation worldwide, as well as an introduction to microgrids concept and its main impacts and challenges into the electric systems. Finally, the main impacts of microgrid on protection equipments are presented at a distribution level, being adaptive protections one of the solutions to the dynamic changes of the electric system.

scholarly journals Design and Implementation of Probabilistic Transient Stability Approach to Assess the High Penetration of Renewable Energy in Korea

2021 ◽  
Vol 13 (8) ◽  
pp. 4205
Author(s):  
Young-Been Cho ◽  
Yun-Sung Cho ◽  
Jae-Gul Lee ◽  
Seung-Chan Oh
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Transient Stability ◽  
Stability Index ◽  
Energy Output ◽  
Effective Capacity ◽  
Stability Assessment ◽  
Energy Capacity ◽  
Electric System ◽  
The Many

Recently, because of the many environmental problems worldwide, Korea is moving to increase its renewable energy output due to the Renewable 3020 Policy. Renewable energy output can change depending on environmental factors. It is for this reason that institutions should consider the instability of renewables when linked to the electric system. This paper describes the methodology of renewable energy capacity calculation based on probabilistic transient stability assessment. Probabilistic transient stability assessment consists of four algorithms: first, to create probabilistic scenarios based on the effective capacity history of renewable energy; second, to evaluate probabilistic transient stability based on transient stability index, interpolation-based transient stability index estimation, reduction-based transient stability index calculation, etc.; third, to implement multiple scenarios to calculate renewable energy capacity using probabilistic evaluation index; and finally, to create a probabilistic transient stability assessment simulator based on Python. This paper calculated renewable energy capacity based on large-scale power system to validate consistency of the proposed paper.

scholarly journals Integration of Photovoltaic Plants and Supercapacitors in Tramway Power Systems

2018 ◽  
Author(s):  
Flavio Ciccarelli ◽  
Luigi Pio Di Noia ◽  
Renato Rizzo
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Power Systems ◽  
Storage System ◽  
Energy Storage System ◽  
Storage Devices ◽  
Electric System ◽  
Supercapacitor Energy Storage ◽  
Photovoltaic Plants ◽  
Renewable Energy Generation

The growing interest in the use of energy storage systems to improve the performance of tramways has prompted the development of control techniques and optimal storage devices, displacement, and sizing to obtain the maximum profit and reduce the total installation cost. Recently, the rapid diffusion of renewable energy generation from photovoltaic panels has also created a large interest in coupling renewable energy and storage units. This study analyzed the integration of a photovoltaic power plant, supercapacitor energy storage system, and railway power system. Random optimization was used to verify the feasibility of this integration in a real tramway electric system operating in the city of Naples, and the benefits and total cost of this integration were evaluated.

scholarly journals Smart Grids for the City of Praia: Benefits and Challenges

2018 ◽  
Vol 3 (2) ◽  
pp. 36
Author(s):  
Claudino F. Pereira Mendes ◽  
José L. Bernal-Agustín ◽  
Álvaro Elgueta-Ruiz ◽  
Rodolfo Dufo-López
Keyword(s):  
Renewable Energy ◽  
Smart Grids ◽  
Cape Verde ◽  
Investment Policy ◽  
Capital City ◽  
Electric System ◽  
Current State ◽  
Photo Voltaic ◽  
The City ◽  
Social And Environmental Impacts

The current state of the electrical sector in Praia (Cape Verde capital city) is characterized by the high cost of electricity and high levels of technical and commercial losses which is caused by the lack of resources of fossil origin. It is also aggravated by an inadequate investment policy forcing a deep restructuring of the entire sector. In order to take advantage of the existing local natural resources and to have a more efficient, robust, and a fair electric system, it seems inevitable to bet on innovative, intelligent, and secure technology which allows tight integration of renewable energy –mainly wind and photo-voltaic energy. In this regard, the present article discusses the economic, social, and environmental impacts of a smart grid for Praia city. Based on a proposed SG architecture that integrates the existing endogenous resources and technologies, it was possible to identify the main advantages and challenges that the implementation of SG technologies would have for the city.

scholarly journals Photovoltaic Plant Optimization to Leverage Electric Self Consumption by Harnessing Building Thermal Mass

2020 ◽  
Vol 12 (2) ◽  
pp. 553 ◽  
Author(s):  
Carlos Fernández Bandera ◽  
Jose Pachano ◽  
Jaume Salom ◽  
Antonis Peppas ◽  
Germán Ramos Ruiz
Keyword(s):  
Renewable Energy ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Thermal Mass ◽  
Air Conditioner ◽  
Mass Storage ◽  
Electric System ◽  
Plant Optimization ◽  
Photovoltaic Plant

The self-consumption without surplus to the grid is one of the aspects of the new Spanish law for prosumers. Increasing the share of renewable energy sources into the grid inherently leads to several constraints. The mismatch between the energy demand and the renewable energy production, which is intermittent in nature, is one of those challenges. Storage offers the possibility to decouple demand and supply, and therefore, it adds flexibility to the electric system. This research evaluates expanding electricity self-consumption without surplus to the grid by harnessing thermal mass storage in the residential sector. The methodology is investigated by using a variable refrigerant flow air conditioner system. Because there is no option to export the excess capacity to the grid, this research proposes an approach to profiting from this surplus energy by activating structural thermal mass, which is quantified from the information acquired using a building energy model. For this purpose, an EnergyPlus model of a flat in Pamplona (Spain) was used. The optimization analysis was based on a set-point modulation control strategy. Results show that under adequate climatological circumstances, the proposed methodology can reduce the total electric energy from the grid between by 60– 80 % .

Sign in / Sign up

Export Citation Format

Share Document