09/19/2023
Source: Energy & Management Powernews
In a two-and-a-half-year field test, the municipal utility association examined the effects of e-car charging behavior on the power grid.
"The field test has shown that the control of private charging is grid-serving, sensible and feasible and is supported by citizens," summarizes Volker Lang, member of the board of BS Energy, the results of the project, which the energy service provider has now completed together with the municipal utility association Thüga. For two and a half years, the partners had tested the grid-friendly control of the charging processes of the participating e-car drivers in two test areas of Braunschweig.
The test areas were located in the historically grown district of Dibbesdorf with old buildings and in a new development area in the district of Waggum, where many heat pumps place additional demands on the grid and PV systems feed in electricity.
The charging processes had been controlled depending on different criteria. One steered the loading achievement if possible into time windows, in which the current offer is high and the demand in the net is low, is called it in a communication of the Thüga. Moreover, the charging power was shifted in such a way that simultaneous charging was avoided. In individual test phases, different incentives for charging control were coupled: For the basic measurement, there was a phase with a constant tariff. In addition, the test tried out a fixed two-stage tariff and a variable three-stage tariff based on network utilization. Participants were also able to decide whether they wanted cost-optimized or low-emission charging.
Positive effects on network load
The project partners were satisfied with the results: "The results show that the basis for the expansion of climate-friendly electromobility is solid and that we are well positioned for the resulting increase in consumption in Braunschweig," said Lang. We have been able to prove that the security of supply is also guaranteed in the future, and have created a data basis for possible, cost-optimized adjustments in our energy supply and networks," adds Jan Gasten, Managing Director of BS Netz.
Also, the majority of the test chargers did not feel restricted in their mobility by the flexible use of the energy supply. An important condition from view of the test persons was however the option of the Sofortladens of their vehicles: They were even prepared to pay a surcharge for this.
The project partners also rated the impact on the environment as positive: the CO2 emissions generated for the production of the charging current had fallen by 124 g/kWh. Transferred to the total stock of electric vehicles in Germany, this could mean savings of 334,800 tons of CO2 per year.
The project was funded by the German Federal Ministry of Economics. In addition to BS Energy and Thüga, the grid operator BS Netz, the digitization agency Kom Dia, the University of Kassel and the Fraunhofer Institute for Energy Economics and Energy System Technology IEE were also involved in the implementation.
Author: Katia Meyer-Tien
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