Most of the rechargeable batteries in the equipment can only use a dedicated charger, and it is impossible to determine the charging parameters and the remaining charging time. In order to solve this problem, we design a digital charger, single-chip microcomputer control as the core, to real time control of rechargeable batteries, can real time collection and rechargeable battery voltage, current, the rest of the parameters such as charging time, can also by serial port and PC communication, and through the display device according to the necessary information to users.
Large scale of electric vehicles integration will pose inevitable impacts on the planning and operation of power system in the future. Considering electric vehicles as movable and distributed storage units, a cluster model, in which the electric vehicles participate load response of power grid, is built. In this paper, coordinated charging modes and charging time of different kinds of EVs are proposed. The Monte Carlo simulation is applied to determine the starting state of charge(SOC) and the initial charging time, etc. Taking the daily load curve in a certain day for example, the impacts of power demand of EVs in different scales on original load curve are calculated. The results show that the natural charging-discharging characteristic of EVs can be controlled to discharge during the peak load time and charge during the load valley.
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