Bidirectional charging management for electric cars: Page 2 of 3

November 08, 2019 //By Christoph Hammerschmidt
R&D project develops bidirectional charging management for e-cars
A consortium with BMW is now exploring ways to use bidirectional charging to link renewable energy networks with the traction batteries of electric vehicles

According to the research consortium, the increasing number of electric vehicles on the road will require a small increase in the amount of electrical energy required. However, there is a growing need to control energy flows intelligently in order to make optimum use of electricity from renewable sources.

BMW is contributing its experience with similar projects in California to the research project. Building on this, BMW has developed an innovative solution for use in the German energy grid in cooperation with the grid operator TenneT, with which the charging strategy of electric vehicles takes into account not only the mobility plans of the customers but also the availability of green electricity and the utilisation of the electricity grid. In response to signals from the grid operator, connected vehicles can interrupt the charging process and continue it at a later point in time. Now the project partners want to go one step further and achieve stronger control effects: Parked electric vehicles connected to a charging station or wallbox can thus be used as flexible power storage devices. In phases of particularly high demand for electrical energy, they feed additional electricity into the grid.

In contrast, their high-voltage batteries are charged primarily at times when the general energy requirement is lower. This means that electricity from renewable energy sources can be absorbed and stored exactly when it is available. And the stored energy can be used exactly when it is needed - for electric driving or to support the electricity networks. In the view of the project consortium, electromobility can help to stabilise the electricity grid, reduce the need to expand the grid and keep electricity prices stable.

At the same time, the intelligently controlled integration of e-vehicles into the power grid can further increase the share of renewable energy in total consumption. By using the storage capacities provided in the vehicle batteries, supply and demand in the area of green electricity can be better coordinated. This creates an energy buffer for wind and solar power plants.


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