Advanced Battery Management System and Power Electronics
The Advanced Battery Management System (ABMS) and its related power electronics will be software solution that will be interfaced with the EMS in order to obtain all the HESS operation data and to provide relevant information on HESS state through both alarms/early warnings and continuously updated HESS battery models.
It is a well known fact that battery performances degradation increases their cost of operation and decrease their reliability. It also introduces under performance of their operation, especially in the case of hybridization where optimal dispatch is crucial, relying on a perfect knowledge on each battery technology behaviour and status at each moment of the lifetime of the HESS. Therefore, battery diagnostic tools, prognostics and health management are major solutions to meet HESS functional requirements and optimise their operation.
Implemented in a server in the cloud, the Advanced BMS solution will benefit from more computational resources with the possibility to develop further complex storage system models. In addition, these diagnostic tools will advantageously help the HESS to detect potential BMS failures or errors. Moreover, in case of large HESS, the ABMS will be able to aggregate monitoring data from different BMS and thus achieve better battery state estimations.
On the other side, to allow connection to the grid a conversion step is required, given that ESS operate in DC and the electrical network is AC. This is why batteries require of a DC/DC and a DC/AC for internal balance and control and deploying an optimal power converter is a key enabling technology within the whole integrated system of the Hybrid Energy Storage (HESS).
In this regard, there is the need to maximize the efficiency of the power converter since it has a direct impact on the round trip efficiency of the HESS. Taking the battery requirements and existing challenges, the innovative power converter will consider an interleaved architecture, which allows to select which level is better to use depending on the power required. The interleaved converter includes redundant elements that allows to modify the power flow through the different equal elements on the power electronics. This will account for an increased efficiency and life extension of about 20%.”