Stochastic simulation and optimization of a hybrid renewable energy system

C. Ioannou, Stochastic simulation and optimization of a hybrid renewable energy system, Diploma thesis, 122 pages, Department of Water Resources and Environmental Engineering – National Technical University of Athens, October 2012.



!n autonomous hybrid system is being analysed, which consists of photovoltaic panels, wind machines, two reservoirs with suitable height difference, and one pumpturbine. The energy is generated by wind machines and solar cells. The pump-turbine is used for the storage and utilization of energy, using wind and solar radiation as its exclusive sources. The objective of the design is to properly assess the size of the system in order to satisfy energy demands reliably at the lowest cost. The chosen approach to address the design problem is by a stochastic simulation model of system operations with a daily time step. Specifically, a synthetic time series of energy demand is created to correspond to 100 000 people, using the historical time series of energy consumption in continental Greece. The synthetic time series of wind speed and sunshine duration are also generated using a multivariable model that maintains persistence using data from a meteorological station in southern Attica (37.89N 23.71W). We analyze the methodology of converting sunshine duration to solar radiation and the way solar energy is calculated. As for the wind energy, its calculation method is analyzed by addressing the influence of the daily time step. The correlation with theoretical functions of reservoir characteristics is necessary to simulate the system. The calculation of the cost is analysed, which is the objective function introduced into the genetic algorithm in order to be minimized. The introduced restriction is that the failure is less than or equal to 100 in length simulation of 182 500 days. We apply the procedure of optimization to different angles of solar panels in order to obtain the optimum one. The results are compared with those derived from synthetic time series with the same statistical characteristics but without the Hurst dynamic. We also examine scenarios with a limited number of wind turbines and perform a sensitivity analysis to the served population.

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Our works that reference this work:

1. C. Ioannou, G. Tsekouras, A. Efstratiadis, and D. Koutsoyiannis, Stochastic analysis and simulation of hydrometeorological processes for optimizing hybrid renewable energy systems, Proceedings of the 2nd Hellenic Concerence on Dams and Reservoirs, Athens, Zappeion, doi:10.13140/RG.2.1.3787.0327, Hellenic Commission on Large Dams, 2013.
2. P. Dimas, D. Bouziotas, D. Nikolopoulos, A. Efstratiadis, and D. Koutsoyiannis, Framework for optimal management of hydroelectric reservoirs through pumped storage: Investigation of Acheloos-Thessaly and Aliakmon hydrosystems, Proceedings of 3rd Hellenic Conference on Dams and Reservoirs, Zappeion, Hellenic Commission on Large Dams, Athens, 2017.