Energy Management System for Photovoltaic Fed Hybrid Electric Vehicle Charging Stations

Recently, Electric Vehicles are attracting significant attention as an environmental friendly, sustainable and economical substitute for vehicles with a conventional engine. It addresses the concerns associated with petroleum fuels, global climate change, and pollution control. In this paper, the design and development of a Photovoltaic (PV) and grid fed Hybrid charging station for electric vehicles is discussed, and the new control strategy is proposed for energy management under different operating conditions. The proposed control ensures the system working in an integrated manner to optimize the energy use from the grid. The system shares power between PV and grid, and directly charge the EV when solar energy is available using Maximum Power Point Tracking (MPPT) and automatically changes modes of operation when solar energy is not available. In addition, the system also delivers the solar power to the grid when solar power is available, but the station is not charging the EV. Reverse power feeding provision is also adapted for the futuristic smart-EV-grid concept where EV shares the grid load. The proposed control strategy can be easily adapted to even for the conventional EV charging stations. This paper provides the detailed modelling and controller design of various power electronics converter used in the system and under varying ambient condition. © 2021 IEEE

Efficiency Assessment of BLDC type Solar Water Pumping System fed by Photovoltaic and Grid

This paper optimizes the operation of Brushless DC motor (BLDC) operated solar water pumping system. The proposed system is assisted with single phase supply to ensure the system operation in the high efficiency zone which is governed by the pump. In conventional systems consisting of either AC supply or PV leads to low reliable and inconsistent operation of the motor for water pumping applications. The proposed system consists of Power Factor Correction (PFC) converter for grid input, DC-DC converter as MPPT channel for PV, and three phase inverter to control BLDC type motor-pump set. The entire system is equipped with the control strategy which has multiple modes of operation based on availability of sources. The modelling of all the power converters and their compensator design are provided in this paper. Performance of the system is investigated using developed test-bed with water-pump, tank, power conditioning unit, solar PV simulator, and grid supply. The control strategy and overall system efficiency is verified by simulation and experimental results. © 2021 IEEE