EV-based voltage regulation in line distribution grid

A large number of electric vehicles (EVs) connected to the grid increase the load of the grid, which may lead to the problems, such as overload, frequency violation and voltage violation. However, the EVs have potential for providing services for the grid, such as voltage regulation and frequency regulation. In this paper, we use the EVs to regulate the voltage of the smart grid and propose an algorithm to maximize the revenue of the parking lot in a line distribution grid considering the EV users' charging demand and the voltage fluctuations, where the voltage is calculated by distribution power flow method. Simulation results show that voltage of the grid can be regulated into a safe range through our method. At the same time, the revenue of the parking lot can be increased by about 19% compared with the situation where the EVs are only allowed to be charged from the grid.