scholarly journals Scheduling of energy storage

Author(s):  
Stan Zachary ◽  
Simon H. Tindemans ◽  
Michael P. Evans ◽  
James R. Cruise ◽  
David Angeli

The increasing reliance on renewable energy generation means that storage may well play a much greater role in the balancing of future electricity systems. We show how heterogeneous stores, differing in capacity and rate constraints, may be optimally, or nearly optimally, scheduled to assist in such balancing, with the aim of minimizing the total imbalance (unserved energy) over any given period of time. It further turns out that in many cases the optimal policies are such that the optimal decision at each point in time is independent of the future evolution of the supply–demand balance in the system, so that these policies remain optimal in a stochastic environment. This article is part of the theme issue ‘The mathematics of energy systems’.

2021 ◽  
Author(s):  
K.S.L. Mendis ◽  
◽  
K.G.A.S. Waidyasekara ◽  
S.S.C. Ginthotavidana ◽  
◽  
...  

The escalation of global energy demand has enhanced the interest on renewable energy technologies worldwide. The reliance of a single energy source has become problematic, and hybrid renewable energy technology has been identified as a feasible solution. Producing energy to limitless increasing demand is a challenging issue faced by Sri Lanka nowadays. Although, there are some studies carried out for renewable energy systems, solar-wind based hybrid renewable systems is an understudied area in Sri Lankan context. Hence, this paper aims to explore the applicability of hybrid solar-wind renewable energy generation approach for Sri Lanka. The study follows a qualitative approach with semi structured interviews from eight industrial experts, and manual content analysis technique was used for data analysis. The paper discussed the current installation practices of solar and wind technologies, applicability of hybrid solar and wind renewable energy systems and national level contribution for hybrid systems. Finally, a validated model was proposed to implement hybrid renewable energy generation systems for Sri Lanka.


Author(s):  
Pedro Mendoza G. ◽  
Maximiliano Arroyo U. ◽  
Wilson Jime´nez

The rural electrification program initiated in Peru in order to achieve the 2012 rural electrification target was developed to forecast energy systems from both conventional and renewable resources. This program has proposed three scenarios for gradual increasing of the amount of renewable energy generation (36% of the 2012 target). However, it’s necessary to analyze the situation because the renewable energy rural market shows a low income for private investors although it has a high social impact. So, there is still significant risk for the development of renewable energy systems that could be minimized by using decentralized biomass energy systems with the application of small-scale-technologies.


2019 ◽  
Vol 11 (5) ◽  
pp. 1471 ◽  
Author(s):  
Seung Baek ◽  
Byung Lee

Renewable energy systems (RES) in buildings should be designed carefully, not only because of the need for an optimal design, but also to comply with related laws. Therefore, the design of RES in the buildings requires close collaboration between architects and engineers from the beginning of the design process. To support such collaboration, this study proposes a simplified design method for RES in buildings during the early design stage. By using the proposed design method, design alternatives that meet the required energy standards as suggested by law are first generated. Further designs are made to evaluate the performance and cost of the design alternatives and to find the optimal types of RES for the building. The study also uses a case study to verify the applicability of the design method to the early design stage. Although the performance and cost of the different design alternatives are similar, the implementation of each type of RES in each design alternative is different. Nonetheless, by analyzing performance patterns and the cost ratio of each type of RES in each design alternative, the study allows the most suitable type of RES to be chosen for the building.


Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6202
Author(s):  
Lynne L. Kiesling ◽  
Leonardo Meeus ◽  
Michael G. Pollitt

The rise of intermittent renewable energy generation, the coming mass penetration of electric vehicles and moves to decarbonise the gas grid are leading to widespread innovation experiments within electricity systems and their associated markets[...]


Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5602
Author(s):  
Charles Newbold ◽  
Mohammad Akrami ◽  
Mahdieh Dibaj

Decarbonisation is becoming a central aim of countries around the globe, ensuring the effects of climate change do not increase exponentially in the coming years. Renewable energy generation is at the core of this decarbonisation process, enabling economies to divorce themselves from a reliance on oil and coal. Hybrid energy systems can utilise multiple generation methods to supply electrical demand best. This paper investigates the use of localised hybrid energy systems around the UK, comparing the financial viability of solar, wind and hydrokinetic generation methods both as a hybrid system and individually in different scenarios. The significance of having localised hybrid energy systems is that they address two large problems within renewable energy generation, that of storage issues and also generating the electricity far away from where it is actually used, requiring extensive infrastructure. The microgrid optimisation software HOMER was used to simulate each of the generation methods alongside the national grid, including lithium ion batteries and converters to create a comprehensive hybrid system. Net Present Cost, which is the current value of all the costs of installing and operating the system over the project lifetime, was considered as the metric. The analysis finds that for each modelled location, wind turbines in combination with lithium ion batteries and a converter is the system with the lowest Net Present Cost, with the exception of Bristol, which also uses hydrokinetic turbines within the system. The findings indicate the extensive wind resources available within the UK, along with identifying that certain locations around the country also have very high potential for tidal power generation.


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