Techno-economic Feasibility of Flywheel Energy Storage System in Standalone and Hybrid Applications

  • Author / Creator
    Arshad, Muhammad Saad
  • Electrical energy storage systems are used to store electrical energy in different forms so that it can be extracted when required. For example, they are suitable for power peak shaving applications and effective integration of renewable energy into islanded microgrids. Flywheel energy storage system (FESS) is a storage technology in which electrical energy is converted and stored in the form of kinetic energy. FESS are gaining popularity due to their high-power charging capabilities and quasi-infinite charge/discharge cycles without depth of discharge limitations.
    The first part of this study involves exploring the possibility of integrating FESS as a standalone system for electric bus fleet charging, in order to achieve greatest performance and economy. A charging system with energy storage was simulated considering either FESS or electrochemical batteries. It was observed that a solution based on FESS can meet requirements and achieve peak shaving with a faster response as compared to batteries. The techno-economic performance was assessed considering net present value and internal rate of return. The results show that FESS outperformed batteries both in terms of suitability and cost effectiveness.
    The application of FESS along with electro-chemical batteries as a hybrid system was also studied to explore the benefits that both technologies may offer when combined. A standalone micro-grid was simulated with two different load profiles under different scenarios. It was observed that greenhouse gas emissions were considerably decreased for some of the modeled scenarios. It was also noted that for both the load profiles, the hybrid system was not only found to fulfil the load demand but was also the cheapest solution upon performing a lifecycle cost assessment. The levelized cost of energy and net present value of the hybrid system showed that it is the most attractive solution.

  • Subjects / Keywords
  • Graduation date
    Fall 2021
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.