Webinar ID4Mobility: grid code and vehicle-to-grid

During 2026, ID4Mobility organised several webinars on electromobility, including one on charging infrastructure and vehicle interactions, in which Acsystème took part.

Raphaël Turquetil, an engineer at Acsystème, took part in the third instalment of ID4Mobility’s series of webinars on electromobility, which aimed to explore the interconnections between mobility, energy and infrastructure. Discussions on the day centred on the link between electric vehicles and charging infrastructure, drawing on practical feedback from demonstration projects and examining the technical and regulatory conditions for scaling up V2X technology.

The programme features four presentations:

• Infrastructure adaptation and large-scale V2X, by Anthony BURON (E-trucks expert),
• Developments in charging infrastructure: NF EN 50549-1, from standard to practice, by Raphael TURQUETIL (Acsystème),
• Optimising charging for large fleets of electric vehicles, by Juan CUENCA (IETR Laboratory/Centrale Supélec),
• Feedback on energy flexibility, by Sébastien NEAUD (Drop’n Plug).

Please find below the link to the webinar and the transcript of Raphaël Turquetil’s presentation.

The scope of the project

Our involvement related exclusively to the software module responsible for ensuring compliance with requirements necessitating software testing. The other elements — the vehicle, the charging point and the hardware components — were developed by other teams within the manufacturer.

In other words, Acsystème developed only part of the overall system. However, it is the ‘vehicle + terminal’ assembly as a whole that must pass the certification tests.

A two-shift system

To meet the client’s needs, we organised the project around two teams.

The first was responsible for software development:

• implementing the standard’s requirements in Simulink,
• developing interfaces with the rest of the terminal,
• automatically generating C code,
• and drafting documentation to ensure traceability of requirements and facilitate future updates.

The second team was responsible for validating the complete system. It developed a model representing the entire system (software module, terminal and vehicle), then designed the tests defined by the EN 50549-10 standard to verify that all requirements were met.

A comprehensive simulation environment

The validation model comprises:

• the grid code module developed by Acsystème,
• the voltage and frequency sensors,
• the relays,
• the vehicle’s on-board charging system.

The electricity grid, meanwhile, is represented as an external environment.

This platform enables compliance tests to be carried out automatically even before validation on actual hardware.

A continuous improvement approach

Development follows an iterative cycle. The code developed in Simulink is integrated into the simulation model and then subjected to the various tests specified in the standard. Where discrepancies are observed, these lead either to the model being refined or to the Simulink code being modified, with a view to continuous improvement.

Once compliant results have been obtained in simulation, the C code is generated and then tested on the actual vehicle.

This approach offers a major advantage: the iterations carried out in simulation are much faster and much less costly than physical testing.

To gradually develop the model

This method also enabled us to gradually refine our model.

At the start of the project, the vehicle was considered to be perfect: it responded instantly to commands.

As more information became available, we introduced response times and the vehicle’s actual dynamics. These new tests highlighted the need to add a controller to the grid code module in order to meet the dynamic requirements of the standard.

Finally, bench tests revealed certain non-linearities that were not represented in the model. We therefore proposed a specific identification process for each type of vehicle in order to further improve the accuracy of the simulations.

Prospects for future development

The immediate objective of the project is to bring to market the first charging point/vehicle combination that complies with regulatory requirements.

The modular architecture developed will then make it easy to integrate:

• new vehicles,
• new charging points,
• future updates to the EN 50549 standard.

This modularity will also facilitate the addition of new features such as:

• V2G (Vehicle-to-Grid – e.g. storing and reselling electricity generated),
• V2H (Vehicle-to-Home – e.g. supplying power in the event of a mains power cut),
• V2B (Vehicle-to-Building – e.g. supplying power to a business).

Capitalise on this expertise

The experience gained during this project can be applied to support other players in the mobility sector – whether in the automotive, construction or agricultural sectors – in the development of V2G or, more broadly, V2X solutions.

It will also help network operators and energy sector stakeholders to facilitate the roll-out of these new capabilities across Europe.

Finally, grid code issues do not concern electric vehicles alone. They also apply to numerous means of energy generation and storage, such as photovoltaic installations, wind turbines and generator sets, for which the development and validation methods implemented are directly transferable.

In summary, this project illustrates how Acsystème supports its clients in integrating regulatory requirements to ensure the safe development and certification of bidirectional charging solutions.