scholarly journals A Photovoltaic-Based DC Microgrid System: Analysis, Design and Experimental Results

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 941 ◽  
Author(s):  
Xiaoling Xiong ◽  
Yuchen Yang
Keyword(s):  
Renewable Energy ◽  
Stability Analysis ◽  
Nonlinear Analysis ◽  
Control Strategy ◽  
Closed Loop ◽  
Boost Converter ◽  
Energy Resources ◽  
Analysis Method ◽  
Renewable Energy Resources ◽  
Dc Microgrid

Due to the exhaustion of fossil energy, the utilization of renewable energy resources is developing quickly. Due to the intermittent nature of the renewable energy resources, the energy storage devices are usually adopted in renewable power generation system to enhance the system reliability. In this paper, the photovoltaic-based DC microgrid (PVDCM) system is designed, which is composed of a solar power system and a battery connected to the common bus via a boost converter and a bidirectional buck/boost converter, respectively. As the photovoltaic (PV) panels might operate in a maximum power point tracking (MPPT) mode or constant voltage mode, meanwhile, the power can flow between the battery and the load bidirectionally. Therefore, for the sake of optimizing power utilization in the PVDCM system, a control strategy making the system able to switch from one operating mode to another smoothly and automatically is proposed in this paper. Moreover, the small-signal modeling method based on averaged state-space is no more applicable in this study, thus the nonlinear analysis method with discrete-time mapping model is adopted for stability analysis. Based on the stability analysis, the closed-loop parameters are designed to make sure the whole system can operate properly in all operating modes. The control strategy and stability analysis based on the nonlinear analysis method in the closed-loop design are verified by experiment results.

scholarly journals Microgrid: Innovation, Challenges and Prospects

2021 ◽  
Vol 9 (10) ◽  
pp. 484-489
Author(s):  
Zaineb Nisar Jan
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Distributed Energy ◽  
Energy Storage Devices ◽  
Dc Microgrid ◽  
Storage Devices ◽  
Microgrid Energy Management ◽  
Present World

Abstract: In the present world where environmental issues are posing a great threat to the survival of mankind a better yet effective way of reducing carbon emissions and improving the environment by less usage of fossil fuels was suggested. This approach was called microgrid (MG). Renewable energy resources could be used effectively to produce electricity and can be easily integrated with the conventional grid. This paper elaborates on the basic concept of microgrid, and then describes the challenges and future prospects of the microgrid. Distribution generators along with energy storage devices and proper interfacing power electronic devices are used. Working on the basis of the type of microgrid is also discussed in this paper. Keywords: Renewable energy resources, distributed energy, AC microgrid, DC microgrid, energy management.

Fault Analysis and Protection of Low-Voltage DC Microgrid Equipped by Renewable Energy Resources

2022 ◽  
pp. 978-1012
Author(s):  
Navid Bayati ◽  
Amin Hajizadeh ◽  
Mohsen Soltani
Keyword(s):  
Renewable Energy ◽  
Low Voltage ◽  
Fault Analysis ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Ring Configuration ◽  
Protection Method ◽  
And Mathematics

This chapter consists of two sections, ‘Modelling of DC Microgrids' and ‘Protection of DC Microgrids'. In the first section, the new developments in DC Microgrids are discussed. Then, the Modelling of renewable energy resources-based DC Microgrid using characteristics and mathematics equations of each component are presented and then they are simulated by MATLAB. Afterward, the fault analysis and fault current behavior of the studied DC Microgrid are investigated. In the second section, a method of protecting the DC Microgrid and locating the fault in different parts of the system is proposed. The proposed method protects DC Microgrid using localized protection devices. And, the effectiveness of the proposed protection method is validated in a DC Microgrid with ring configuration.

scholarly journals Control Strategy of Hybrid AC/DC Microgrid in Standalone Mode

2020 ◽  
Vol 9 (2) ◽  
pp. 295-301
Author(s):  
Nabil Qachchachi ◽  
Hassane Mahmoudi ◽  
Abdennebi El Hassnaoui
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Residential Buildings ◽  
Storage System ◽  
Energy Resources ◽  
Mixed Integer ◽  
Renewable Energy Resources ◽  
Dc Microgrid ◽  
Power System Control ◽  
Time Operation

The fluctuation of production of renewable energy resources (RESs) is a big problem for its installation and integration in isolated residential buildings. A hybrid AC/DC microgrid facilitates the good operation of RESs with a storage system in standalone mode and the possibilities of smart energy management. In this paper optimization research of the hybrid ac/dc microgrid in isolated mode of operation is presented. The power system is supplied by various Renewable Energy Resources (RESs), Photovoltaic arrays (PVA), a Wind Turbine Generator (WTG), Diesel Generator (DG) and supported by Batteries Storage System (BSS) for short term storage. The main objective of this study is to optimize power flow within a hybrid ac/dc microgrid with regards to reliability in islanded mode. First a mathematical model optimized by mixed integer linear programming and solved by CPLEX solver with JAVA language is developed for an islanded RES system and then, based on the developed model, the power system control is simulated for different cases of off-grid mode. Simulation results have shown that the management strategy can maintain power balancing while performing optimized control and give a controllable loads and batteries charging/discharging powers, even with unpredictability of RESs powers outputs and arbitrary energy tariffs. Finally, the proposed algorithm respects the optimization in real-time operation under various constraints.%.©2020. CBIORE-IJRED. All rights reserved

Damping-Based Droop Control Strategy Allowing an Increased Penetration of Renewable Energy Resources in Low-Voltage Grids

2016 ◽  
Vol 31 (4) ◽  
pp. 1447-1455 ◽  
Author(s):  
Dimitar V. Bozalakov ◽  
Tine L. Vandoorn ◽  
Bart Meersman ◽  
Grigoris K. Papagiannis ◽  
Andreas I. Chrysochos ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Control Strategy ◽  
Low Voltage ◽  
Energy Resources ◽  
Droop Control ◽  
Renewable Energy Resources
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