Research on the Topology of a Custom Power Device for Electric Vehicle Charging Station

As a result of large-scale electric vehicles starting charging at a station, power quality problems, such as voltage sags, will occur in the power grid. Based on this, a custom power device called Dynamic Voltage Restorer (DVR) is proposed to be connected to the electric vehicle charging station to deal with power quality problems. Considering that the filter capacitor can be set at different locations of DVR, i.e. parallel connection at converter side, line side and load side, this paper compares and analyses the mathematical models of three different topologies of DVR, and points out that the disturbance suppression ability of the topology of filter capacitor parallel on load side is relatively strongest, which is more suitable for the application of electric vehicle charging station.