Design of a power electronic device for vanadium redox flow battery in a hybrid energy storage system

• Main Author: Ramesh, Sanjana
• Other Authors: Amer M. Y. M. Ghias
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Electrical and electronic engineering::Power electronics
• Online Access: https://hdl.handle.net/10356/169500
• Institution: Nanyang Technological University

One of the foremost prominent problems faced by the renewable energy industry is intermittency in power generation. Traditional power generation using fossil fuels remains unaffected by intermittency. They are, in contrast, able to provide a constant source of energy. The issue here, however, lies in the pollution they cause in the environment. A shift towards renewable power generation is therefore recommended; while their sources are inexhaustible, their growth is limited by their intermittency. The pursuit of integrating more renewables in power systems can be bolstered by using technologies like energy storage systems (ESSs). ESSs have thus played a crucial role in promoting renewables. This report aims to bolster the continued proliferation of renewables by supporting the Vanadium Redox Flow Battery (VRFB) in a Hybrid Energy Storage System (HESS) setup with a Lithium-Ion Battery. This report is focused on the Power Electronic Device (PED) of the VRFB system, i.e., a DC-DC converter and a 3-phase inverter. The topology of the DC-DC converter selected for this application is a Cascaded Buck Boost (CBB) converter that operates with droop control. The inverter selected is a three-leg three-phase inverter implemented with dq control. The two systems are integrated to form a single bidirectional system to aid in the charge and discharge of the VRFB. Its results are simulated and studied.