Conference Papers
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Item Transient behavioural modelling of Battery Energy Storage System supporting Microgrid(Institute of Electrical and Electronics Engineers Inc., 2020) Joshua, A.M.; Vittal, K.P.Energy storage is a vital component for a resilient microgrid. The high investment cost associated with storage is the major deterrent for its integration in a microgrid. But with the advent of Electric Vehicles and Smart Grids, battery technology and its mass production have got a huge thrust. Cost of the battery is anticipated to come down in future and battery storage customary in microgrids. Though storage will solve all problems related to power mismatches between generation and loads, it brings some additional challenges. Due to the bidirectional power flows, control and protection become complicated. For an effective microgrid protection design, there is a need to study the transient behaviour of its components. In this paper, a microgrid model with a centralised Battery Energy Storage System (BESS) is built. The control strategies automatically switch between grid connected and standalone modes of operation. The model is verified using PSCAD simulations for various operating scenarios. This paper emphasises the role of BESS in a microgrid and investigates the transient behaviour of Distributed Generators (DGs) under various faults in grid connected and islanded operation modes. © 2020 IEEE.Item Control of CLLC Resonant Converter in Grid Connected Electric Bus charging station(Institute of Electrical and Electronics Engineers Inc., 2022) Bhanja, S.; Joshua, A.M.; Vittal K, K.Battery Energy Storage System(BESS) is essential for a resilient microgrid. Electric vehicle charging stations operating in vehicle to grid(V2G) can act as a portable power source in the microgrid. To regulate the power flow for both BESS and electric vehicle charging stations, a bi-directional converter is necessary. This paper presents a test case where the BESS system and electric bus(EB) charging station are connected in parallel with the utility grid and loads. The Capacitor- Inductor-Capacitor (CLLC) converter is utilized as a bi-directional DC-DC converter. The CLLC converter is widely used due to its simple symmetrical design and ability to achieve soft switching. A novel dual hysteresis band logic along with variable frequency control method has been implemented for the CLLC converter. The DC link voltage, battery current, ZVS, and ZCS operations have all been examined in MATLAB/SIMULINK environment with an appropriate controller. Findings show that the BESS and EB charging station works satisfactorily in both forward and reverse modes. © 2022 IEEE.