Optimisation of reference state‐of‐charge curves for the feed‐forward charge/discharge control of energy storage systems on‐board DC electric railway vehicles

2015 ◽  
Vol 5 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Ryo Takagi ◽  
Tetsuo Amano
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
State Of Charge ◽  
Reference State ◽  
Energy Storage Systems ◽  
Feed Forward ◽  
Railway Vehicles ◽  
Electric Railway ◽  
Charge Discharge

scholarly journals Electricity Cost Optimization in Energy Storage Systems by Combining a Genetic Algorithm with Dynamic Programming

Mathematics ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1526 ◽  
Author(s):  
Seung-Ju Lee ◽  
Yourim Yoon
Keyword(s):  
Genetic Algorithm ◽  
Dynamic Programming ◽  
Energy Storage ◽  
Storage Systems ◽  
Cost Optimization ◽  
Energy Storage Systems ◽  
Electricity Cost ◽  
Efficient Charge ◽  
Time Of Use Pricing ◽  
Charge Discharge

Recently, energy storage systems (ESSs) are becoming more important as renewable and microgrid technologies advance. ESSs can act as a buffer between generation and load and enable commercial and industrial end users to reduce their electricity expenses by controlling the charge/discharge amount. In this paper, to derive efficient charge/discharge schedules of ESSs based on time-of-use pricing with renewable energy, a combination of genetic algorithm and dynamic programming is proposed. The performance of the combined method is improved by adjusting the size of the base units of dynamic programming. We show the effectiveness of the proposed method by simulating experiments with load and generation profiles of various commercial electricity consumers.

scholarly journals Partial State-of-Charge Mitigation in Standalone Photovoltaic Hybrid Storage Systems

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4393 ◽  
Author(s):  
Iván Sanz-Gorrachategui ◽  
Carlos Bernal Ruiz ◽  
Estanis Oyarbide Usabiaga ◽  
Antonio Bono Nuez ◽  
Sergio Jesús Artal Sevil ◽  
...  
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Low Cost ◽  
State Of Charge ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Satisfactory Outcome ◽  
Partial State ◽  
Term Performance ◽  
The Impact

Energy Storage in photovoltaic installations has increased in popularity in recent years due to the improvement in solar panel technology and energy storage systems. In several places where the grid is not available, in remote isolated rural locations or developing countries, isolated photovoltaic installations are one of the main options to power DC micro-grids. In these scenarios, energy storage elements are mandatory due to the natural day-night cycles and low irradiation periods. Traditionally, lead-acid batteries have been responsible for this task, due to their availability and low cost. However, the intermittent features of the solar irradiance patterns and load demand, generate multiple shallow charge–discharge cycles or high power pulses, which worsen the performance of these batteries. Some Hybrid Energy Storage Systems (HESSs) have been reported in the literature to enhance the lifetime and power capabilities of these storage elements, but they are not intended to overcome the Partial State of Charge (PSoC) issue caused by daily cycles, which has an effect on the short and mid-term performance of the system. This paper studies the impact of the already proposed HESSs on PSoC operation, establishing the optimal hybrid ratios, and implementing them in a real installation with a satisfactory outcome.

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