Practical pilot tests by Porsche, grid operator TransnetBW and consultancy Intelligent Energy System Services (IE2S) have shown that electrically balanced electricity can be stored in the high-voltage batteries of a fleet of smart electric vehicles. Both at home and in the laboratory, five production Taycans are connected to the network via the Porsche Home Energy Manager (HEM).
The software of these control centers has already been tested in advance by experts from Porsche Engineering.
Porsche Home Energy Manager monitors energy and consumption. It protects home communications from overload (“power outage protection”) and provides smart charging.
The charging technology for the Porsche Taycan as well as our products for home energy management and mobile chargers have great potential for the future: pilot tests prove it. Balancing electricity markets is not the only place where such pooling systems can be useful. Advanced solutions for green charging and other car-to-grid applications are also possible. And that’s not all: if in the future electric vehicles return electricity to the grid, for example, through private photovoltaic systems, which will contribute to the spread of renewable energy sources, this will further increase the popularity of electric vehicles.
As renewable energy sources expand, balancing power will become even more important for the safe operation of the grid in the future. The grid must always be stable, even if the wind and sun do not always produce stable energy. If the network cannot be stabilized at a constant frequency, there is a risk of a power outage. Until now, the damping of these oscillations was, in particular, the responsibility of conventional power plants. Using a high-voltage battery as a buffer would be a win-win situation: EV drivers could be financially compensated for their contribution to balancing electricity.
The aggregation system controls and coordinates the charging process in real time. The key data transfer element used in the pilot test is the cloud aggregation system developed by IE2S. This coordinates and controls the charging process of the electric vehicle in real time, translating the grid operator’s balance power setpoint into a vehicle-specific signal.
The combining system also controls high frequency synchronous bidirectional data transmission. For testing, the aggregation system was connected to TransnetBW’s main control center in Wendlingen near Stuttgart.
The project team successfully implemented a complex communication infrastructure between our control system and several electric vehicles. At the same time, stringent requirements for the storage and delivery of balanced power are met. This will allow us to integrate electric vehicles into future smart grids.
For safety reasons, symmetrical power supplies are subject to strict German standards. During pilot tests, detailed measurements showed that the target values of the network management system were achieved. This applies to primary (FCR: frequency control reserve) and secondary (aFRR: automatic frequency recovery reserve) symmetrical power. FCR is needed to quickly stabilize the network, while aFRR has five minutes to be fully available.
Measurements are made in the control system, assets (Taycan, mobile charger and HEM) and pool system. For FCR, the HEM functionality has been extended to include local frequency measurements.
TransnetBW GmbH operates the transmission network in Baden-Württemberg. Through this transmission network, the company provides electricity to the region, Germany and Europe. He manages and controls the power flow in the network and is responsible for the stability of the system in Baden-Württemberg. To this end, it also researches future-oriented technologies and develops new processes.
Intelligent Energy System Services is a joint venture between TransnetBW and MHP, a management and IT consulting subsidiary of Porsche. His mission is to use his combined expertise to advise companies whose business models have changed as a result of the transition to energy and mobility.
Posted on April 10, 2022 in Electrics (battery), Smart charging, Smart grid, V2X | Permalink | Comments (0)
Post time: Mar-25-2023
