Abstract
During the past few decades, there has been significant growth in the renewable energy market because of increased concern over global warming and the continuous depletion of fossil fuel resources. There is a promising solar thermal technology that utilizes low-temperature heat to generate electricity. The conversion process of thermal energy to electricity is based on the principle of an organic Rankine cycle (ORC). This study investigated a novel islanded hybrid power system consisting of an ORC low temperature solar thermal system, wind (WTG), diesel generation (DEG) set, and combined application of an energy storage system (ESS), such as a battery (BESS), super magnetic energy storage (SMES), and an ultracapacitor (UC) unit. Furthermore, the hybrid system was employed with a single controller (one of proportional-integral (PI), PI with derivative (PID), two-degree-of-freedom (2DOF) PI, and 2DOF PID controllers) with proportionate gains to the DEG, and the ESS, which is another unique aspect of this work. Moreover, a comparative performance assessment of the flower pollination algorithm (FPA) to tune the PI, PID, 2DOF PI, and 2DOF PID controllers was carried out. Finally, the performance of the above hybrid system was compared with different ESS combinations, namely, (i) only BESS, (ii) BESS + UC, and (iii) BESS + SMES. The simulation results indicated that a renewable integrated isolated power system with BESS + SMES provided a better response than the other ESS combinations. In fact, the presence of comparative dynamic responses verified the superiority of an FPA-tuned 2DOF PID compared with other FPA-tuned controllers.
Highlights
Over the past few decades, there has been significant growth in the solar thermal market because of increased concern over global warming and the continuous depletion of fossil fuel resources [1].solar thermal generating systems usually use a steam cycle with a high absorber temperature, and to reduce the cost of generation to a reasonable value, the capacity should be in the megawatt range [2]
An islanded hybrid power system consisting of an organic Rankine cycle (ORC) low-temperature solar thermal system, windAn turbine generator, diesel engine and combined application of thermal various system, energy islanded hybrid power system generator, consisting of anthe low-temperature solar storage systems was investigated for the first time.and
With proportionate storage systems was investigated for the first time
Summary
Over the past few decades, there has been significant growth in the solar thermal market because of increased concern over global warming and the continuous depletion of fossil fuel resources [1]. An ORC-based solar thermal–wind generation (WTG)–diesel generation (DEG) autonomous hybrid power network was considered Despite their abundance and relative ease of access, wind and low temperature solar thermal energy have intermittency issues and require a sufficient backup for power quality improvement. The key objectives of this research are summarized below: disturbances of the sub-components, i.e., load, renewable power generations, or all of the (a) To investigate the dynamic behavior of PI, PID, 2DOF PI, and 2DOF PID controllers in above cases.time-domain simulations of a WTG-STPG-DEG-based autonomous hybrid energy system with. To comparethe thefollowing performance of the (i)hybrid system in(iii) terms the frequency deviation (b) To optimize the gains of the PI, PID, 2DOF PI, and 2DOF PID controllers using the heuristic in two different energy storage combinations, i.e., UC.
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