scholarly journals Development and Experimental Validation of a Supercapacitor Frequency Domain Model for Industrial Energy Applications Considering Dynamic Behaviour at High Frequencies

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1156 ◽  
Author(s):  
Gustavo Navarro ◽  
Jorge Nájera ◽  
Jorge Torres ◽  
Marcos Blanco ◽  
Miguel Santos ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Frequency ◽  
Electrochemical Impedance ◽  
Storage System ◽  
Electric Circuit ◽  
Experimental Tests ◽  
Internal Resistance ◽  
Industrial Applications ◽  
Domain Model ◽  
Wide Range

Supercapacitors, one of the most promising energy storage technologies for high power density industrial applications, exchange the energy mostly through power electronic converters, operating under high frequency components due to the commutation. The high frequency produces important effects on the performance of the supercapacitors in relation to their capacitance, inductance and internal resistance (ESR). These parameters are fundamental to evaluate the efficiency of this energy storage system. The aim of the paper is to obtain an accurate model of two supercapacitors connected in series (functional and extrapolated unit) to represent the frequency effects for a wide range of frequencies. The methodology is based on the definition of an appropriate equivalent electric circuit with voltage dependance, obtaining their parameters from experimental tests, carried out by means of electrochemical impedance spectroscopy (EIS) and the use of specific software tools such as EC-Lab® and Statgraphics Centurion®. The paper concludes with a model which reproduces with accuracy both the frequency response of the model BCAP3000 supercapacitors, provided by the manufacturer, and the experimental results obtained by the authors.

Dynamic Performance Analysis of Large-Scale Packed Bed Truncated Conical Thermal Energy Storage

2019 ◽  
Author(s):  
Shobhana Singh ◽  
Kim Sørensen
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Storage System ◽  
Transient Behavior ◽  
Packed Bed ◽  
Energy Storage System ◽  
Heat Transfer Fluid ◽  
Design Parameters ◽  
Wide Range ◽  
Dynamic Performance Analysis

Abstract In the present paper, a high-temperature packed bed energy storage system of volume 175,000m3 is numerically investigated. The system is a underground packed bed of truncated conical shape, which comprises of rocks as a storage medium and air as a heat transfer fluid. A one-dimensional, two-phase model is developed to simulate the transient behavior of the storage. The developed model is used to conduct a parametric study with a wide range of design parameters to investigate the change in performance during both charging and discharging operation. Results show that the model satisfactorily predicts the dynamic behavior, and the truncated conical shaped storage with a rock diameter of 3cm, insulation thickness up to 0.6m and charging-discharging rate of 553kg/s leads to lower thermal losses and higher energy efficiencies. The paper provides useful insight into the transient performance and efficiency of a large-scale packed bed energy storage system within the range of parameters investigated.

Effect of Design Parameters on the Performance of Thermal Energy Storage Systems

Solar Energy ◽  
2004 ◽  
Author(s):  
Gregor P. Henze
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Large Scale ◽  
Control Strategies ◽  
Storage System ◽  
Operating Cost ◽  
Energy Storage System ◽  
Design Parameters ◽  
Wide Range

This paper describes simulation-based results of a large-scale investigation of a commercial cooling plant including a thermal energy storage system. A cooling plant with an ice-on-coil system with external melt and a reciprocating compressor operating in a large office building was analyzed under four different control strategies. Optimal control as the strategy that minimizes the total operating cost (demand and energy charges) served as a benchmark to assess the performance of the three conventional controls. However, all control strategies depend on properly selected design parameters. The storage and chiller capacities as the primary design parameters were varied over a wide range and the dependence of the system’s cost saving performance on these parameters was evaluated.

scholarly journals Investigation of behavior of BESS with PV using MATLAB/Simulink

2021 ◽  
Vol 9 (10) ◽  
pp. 1726-1730
Author(s):  
Yash Gupta
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Solar Photovoltaic ◽  
Distributed Energy ◽  
Distributed Energy Storage ◽  
Wide Range ◽  
Renewable Energy Generation ◽  
Distribution Grids

Abstract: As renewable energy penetration rises, integrating it will become a major issue that will necessitate new generating support infrastructure; an energy storage system is one answer to this problem. Battery technologies, in particular, have a wide range of energy and power output capabilities, making them perfect for integration. In many regions where renewable energy generation systems will be implemented, distributed energy storage on distribution grids may be required. When the sun is not shining or the weather is cloudy, an energy storage system is required for solar photovoltaic systems. For PV applications, a battery is used as an energy storage system. Keywords: Energy storage system, Battery, Simulink and modelling.

Flywheel Energy Storage System Using Magnetic Levitation

2017 ◽  
Vol 7 (8) ◽  
pp. 90 ◽  
Author(s):  
Ramya V ◽  
Naresh Kumar M ◽  
Nanthine S ◽  
Ramya Sri M
Keyword(s):  
Energy Storage ◽  
Magnetic Levitation ◽  
Storage System ◽  
Energy Storage System ◽  
Flywheel Energy Storage ◽  
Storage Mechanism ◽  
Flywheel Energy Storage System ◽  
Wide Range ◽  
Grid Applications ◽  
Intermediate Storage

This paper deals with the voltage sag compensator in a system using flywheel energy storage system technology by using partial magnetic levitation. Voltage fluctuates in a generator from second to second and due to these fluctuations, it becomes difficult to meet the consumer demand since they account to high current losses. In such a case, Flywheels are used where energy is stored mechanically and transferred to and from the flywheel by an integrated motor/generator. Today flywheels are used as supplementary UPS storage at several industries world over. Future applications span a wide range including electric vehicles, intermediate storage for renewable energy generation and direct grid applications from power quality issues to offering an alternative to strengthening transmission. One of the key advantages of flywheel is that it compensates for the losses of the system by its storage mechanism and thus high overall efficiency is attained. When voltage is increased, current losses are reduced and transformer steps become redundant. Recent progress in semi-conductor technology enables faster switching and lower costs. Flywheel with magnetic bearings using magnetic levitation has been introduced for effectiveness of the system and to overcome frictional losses. The predominant parts of prior studies have been directed towards optimizing mechanical issues whereas the electro technical part now seems to show great potential for improvement. An overview of flywheel technology and previous projects are presented and moreover a 200kW flywheel using high voltage technology is simulated.

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