scholarly journals Analysis of thermochemical energy storage in an elemental configuration

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexandre Malley-Ernewein ◽  
Sylvie Lorente
Keyword(s):  
Energy Storage ◽  
Numerical Experiments ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Fast Response ◽  
Fluid Volume ◽  
Humid Air ◽  
Constructal Law ◽  
Overall Performance

Abstract Here we show theoretically that the design of a thermochemical energy storage system for fast response and high thermal power can be predicted in accord with the constructal law of design. In this fundamental configuration, the walls of the elemental cylinder are impregnated with salt, while humid air is blown through the tube. Cases with constant salt volume or constant fluid volume or both are considered. It is shown that the best design in each case meets the equipartition of imperfections principle. The predictions are confirmed by full numerical experiments, allowing to consider various shape ratios and study their impact on the overall performance.

scholarly journals Evaluation of a 1 MW, 250 kW-hr Battery Energy Storage System for Grid Services for the Island of Hawaii

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3367 ◽  
Author(s):  
Karl Stein ◽  
Moe Tun ◽  
Keith Musser ◽  
Richard Rocheleau
Keyword(s):  
Energy Storage ◽  
Data Collection ◽  
Storage System ◽  
Energy Storage System ◽  
Fast Response ◽  
Lessons Learned ◽  
Battery Energy Storage ◽  
Utility Company ◽  
Battery Energy ◽  
The Impact

Battery energy storage systems (BESSs) are being deployed on electrical grids in significant numbers to provide fast-response services. These systems are normally procured by the end user, such as a utility grid owner or independent power producer. This paper introduces a novel research project in which a research institution has purchased a 1 MW BESS and turned ownership over to a utility company under an agreement that allowed the institution to perform experimentation and data collection on the grid for a multi-year period. This arrangement, along with protocols governing experimentation, has created a unique research opportunity to actively and systematically test the impact of a BESS on a live island grid. The 2012 installation and commissioning of the BESS was facilitated by a partnership between the Hawaii Natural Energy Institute (HNEI) and the utility owner, the Hawaiian Electric and Light Company (HELCO). After the test period ended, HELCO continued to allow data collection (including health testing). In 2018, after 8500 equivalent cycles, the BESS continues to operate within specifications. HNEI continues to provide HELCO with expertise to aid with diagnostics as needed. Details about the BESS design, installation, experimental protocols, initial results, and lessons learned are presented in this paper.

An Optimum Sizing Methodology for Combined Photovoltaic-Energy Storage Electricity Generation Configurations

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
J. K. Kaldellis ◽  
D. Zafirakis ◽  
K. Kavadias ◽  
E. Kondili
Keyword(s):  
Energy Storage ◽  
Electricity Generation ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Local Network ◽  
Electrical Networks ◽  
Power Stations ◽  
Generation Cost

The electrification of autonomous electrical networks is in most cases described by low quality of electricity available at very high production cost. Furthermore, autonomous electrical networks are subject to strict constraints posing serious limitations on the absorption of renewable energy sources (RES)-based electricity generation. To bypass these constraints and also to secure a more sustainable electricity supply status, the concept of combining photovoltaic (PV) power stations and energy storage systems comprises a promising solution for small scaled autonomous electrical networks, increasing the reliability of the local network as well. In this context, the present study is devoted in developing a complete methodology, able to define the size of an autonomous electricity generation system, based on the maximum available solar potential exploitation at minimum electricity generation cost. In addition special emphasis is given in order to select the most cost-efficient energy storage configuration available. According to the calculation results obtained, one may clearly state that an optimum sizing combination of a PV generator along with an appropriate energy storage system may significantly contribute on reducing the electricity generation cost in several island electrical systems, providing also abundant and high quality electricity without the environmental and macro-economic impacts of the oil-based thermal power stations.

Maximizing Thermal Power Output of an Ammonia Synthesis Reactor for a Solar Thermochemical Energy Storage System

2000 ◽  
Vol 123 (2) ◽  
pp. 75-82 ◽  
Author(s):  
H. Kreetz ◽  
K. Lovegrove ◽  
A. Luzzi
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Storage System ◽  
Thermal Power ◽  
Recovery Process ◽  
Energy Storage System ◽  
Reactor Wall ◽  
Reversible Dissociation ◽  
Thermal Output ◽  
National University

Solar energy storage using a closed loop thermochemical system based on the reversible dissociation of ammonia, has been investigated at the Australian National University for over two decades. Theoretical and system studies have indicated that large scale systems offer reasonable thermodynamic and economic performance. Experimental investigation has confirmed the technical viability of the concept. This investigation has looked at the effect of operating parameters on the thermal output achievable from the heat recovery process. Pressure, massflow and inlet gas composition were all found to have significant effects on the output achievable. Maximizing the thermal output via adjustment of reactor wall temperature profiles indicates that the average temperature of the reactor walls is more significant than the shape of the profile. This investigation has indicated the potential and provided the foundations for future exergo-economic optimizations of the system.

scholarly journals Control Strategies and Economic Analysis of an LTO Battery Energy Storage System for AGC Ancillary Service

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 505 ◽  
Author(s):  
Bingxiang Sun ◽  
Xitian He ◽  
Weige Zhang ◽  
Yangxi Li ◽  
Minming Gong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Unit ◽  
Control Strategies ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Automatic Generation ◽  
Utilization Rate ◽  
Frequency Regulation ◽  
Ancillary Service

With the rapid growth of renewable energy and the DC fast charge pile of the electric vehicle, their inherent volatility and randomness increase a power system’s unbalance of instantaneous power. The need for power grid frequency regulation is increasing. The energy storage system (ESS) can be used to assist the thermal power unit so that a better frequency regulation result is obtained without changing the original operating mode of the unit. In this paper, a set of different charging/discharging control strategies of the lithium titanate battery (LTO) is proposed, which are chosen according to the interval of the State of energy (SOE) to improve the utilization rate of the ESS. Finally, the cost-benefit model of the ESS participating in automatic generation control ancillary service is established. Case analysis proves that after a 1.75 MWh ESS is configured for a 600 MW thermal power unit, Kp and D is increased from 1.42 to 6.38 and 2857 to 6895 MW. The net daily income is increased from 20,284 yuan to 199,900 yuan with a repayment period of 93 days. The results show that the control strategies and the energy configuration method can improve the performance and economic return of the system.

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