Alternative grid connection agreements for integrating fast-charging stations in the distribution system
Challenge and objective
Integrating fast-charging stations (FCS) in the distribution system using traditional grid connection agreements often requires grid reinforcement to avoid overloading and undervoltage problems. This leads to delays and additional costs for deploying charging infrastructure to support the rapid increase in adoption of electrical vehicles.
The potential of alternative connection agreements between FCS operators and DSOs is explored.
Work performed
A methodology is developed that models active load curtailment and reactive power provision from FCSs as active measures to avoid undervoltage, using load and grid data available to DSOs as inputs.
Significant results
Applying the methodology to the CINELDI reference system, it is found that a 2 MW FCS can be connected with the condition of active measures activated for just around 4% of the year.
For the rest of the year the FCS can consume power at full capacity without triggering voltage problems.
Impact for distribution system innovation
Alternative connection agreements have great potential but requires additional analyses and communication between the DSO and the FCS operator. This work gives an example of analysis results that can support the DSO in designing the conditions of the connection agreements.
