Topical day | Fast charging at high power: how to mitigate risks for power grids

Opportunity charging of electric buses can have a big impact on power grids, overloading transformers and cables, and causing power quality issues. The workshop is an opportunity to discuss and evaluate mitigation strategies with DSOs and is organized by ENGIE Laborelec as part of the EU co-funded ASSURED project.

Mitigating the risks to the POWER GRID: DSO perspective
ENGIE Laborelec, Linkebeek, Belgium
Wednesday 6 February 2020
09:00 am - 05:00 pm

Bloomberg (1) estimates there are currently 2,400 electric buses on European roads and this figure is expected to rise to 12,000 by 2025 and 52,000 by 2030.

There are two main charging strategies: slow overnight charging at bus terminals or depots or opportunity charging which involves fast charging at high power, typically from under a 60 seconds to ~10 minutes, and at 150-600 kW per charging point, often out on the road.

The opportunity charging (2) method represents the preferred solution for 60% of buses ordered in 2017. However, it can impact the local grid by for example overloading transformers and cables, causing power quality issues such as voltage drops.
As part of its contribution to the ASSURED project, this is a unique workshop organized by ENGIE Laborelec inviting European DSOs and other stakeholders to join the discussion with ASSURED project partners to devise and evaluate mitigation strategies for opportunity charging of electric buses.
ASSURED is an EU co-funded Horizon 2020 project, with 39 partners, drawn from OEMs, academia, research centers and other stakeholders, including ENGIE Laborelec. The project is tasked with overcoming the main barriers to large-scale deployment of heavy-duty and medium-duty electric vehicles in European cities through testing and verifying high power charging infrastructures in real operational environments.

Provisional programme

  • Introduction to the ASSURED Project.

  • Adverse effects and risks associated with opportunity charging.

    • Adverse effects and risks associated with opportunity charging identified in the project;

    • Interactive discussion and feedback from DSOs, including similarities and differences across Europe.

  • Laboratory visitsElectric Mobility Lab, Home Lab, Batteries Lab.

  • Mitigating the effects of opportunity charging

    • Tackling the risk elements identified;

    • Addressing possible mitigation measures.

  • Wrap-up

What comes next?

The conclusions of the workshops will become part of a publicly available document to be distributed among relevant stakeholders including DSOs, industrial partners and the EC. Workshop participants will also:

  • Gain a better understanding of potential issues in grids Europe-wide and solutions proposed by other grid operators;
  • Gain a better understanding of which solutions to deploy and which are less promising;
  • Understand the position and constraints of other DSOs regarding market rules;
  • Help shape the recommendations of European DSOs to be included in a public document.