Abstract
This paper studies four voltage dependent solutions for modulating the charging of multiple Electric Vehicles (EVs) in a real Danish network. Uncontrolled EV charging, especially in grid with high EV penetration, can result in overloaded lines and transformers, low-voltages and other performance degradations which lead to poor quality of supply. Therefore, a decentralized control for modulating the EVs' charging current is developed, which sets the EV reference current based on the phase-to-neutral voltage at the EV connection node. Due to the controller's decentralised feature, EVs plugged-in on phases with lower voltages are constrained during the charging period. In order to solve instability issues which may occur due to lack of communication between the controllers, several improvements are applied to the aforementioned droop control. Simulation results demonstrate the performance of the voltage dependent controls for a real Danish distribution grid.
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