Abstract
A hybrid microgrid-powered charging station reduces transmission losses with better power flow control in the modern power system. However, the uncoordinated charging of battery electric vehicles (BEVs) with the hybrid microgrid results in ineffective utilization of the renewable energy sources connected to the charging station. Furthermore, planned development of upcoming charging stations includes a multiport charging facility, which will cause overloading of the utility grid. The paper analyzes the following technical issues: (1) the energy management strategy and converter control of multiport BEV charging from a photovoltaic (PV) source and its effective utilization; (2) maintenance of the DC bus voltage irrespective of the utility grid overloading, which is caused by either local load or the meagerness of PV power through its energy storage unit (ESU). In addition, the charge controller provides closed loop charging through constant current and voltage, and this reduces the charging time. The aim of an energy management strategy is to minimize the usage of utility grid power and store PV power when the vehicle is not connected for charging. The proposed energy management strategy (EMS) was modeled and simulated using MATLAB/Simulink, and its different modes of operation were verified. A laboratory-scale experimental prototype was also developed, and the performance of the proposed charging station was investigated.
Highlights
The road transportation sector (RTS) utilizes a substantial proportion of oil and gas resources, produces carbon emissions, and pollutes the environment [1]
With the above condition, only one battery electric vehicles (BEVs) is available at the charging terminal (Mode-2); DC grid power is maintained at 1425 W, which is sufficient to charge a particular BEV without receiving power from the energy storage unit (ESU)
W,modes with various conditions the is ESU, two modes, Mode-2 is taken into consideration to demonstrate the charging current and input power
Summary
The road transportation sector (RTS) utilizes a substantial proportion of oil and gas resources, produces carbon emissions, and pollutes the environment [1]. The strategy proposed here effectively utilizes available energy sources using EMS algorithms by meeting the demand can bring down the investment cost and maintains the DC bus voltage. Based on the above discussion, it is observed that a proper EMS algorithm is required for multiport charging stations to obtain efficient power flow. Eleven different modes of energy management strategies are developed for the proposed microgrid to provide continuous power to the BEV charging point. When the utility grid is fully loaded and irradiation for PV energy production is low, BEV charging is delayed or temporarily interrupted, and the ESU and vehicle-to-vehicle charging manage the power demand. Symbols and abbreviations are given in the list titled Abbreviations
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