422 / 2022-03-15 21:36:58

Application of a FEM based network model for transient analysis of a 12 kV high voltage battery energy storage

high voltage, battery storage, network model

Purpose / Aim

The increasing integration of fluctuation renewable energies tends to the need of storage systems, e.g. battery energy storage systems (BESS) with high power requirements. The operating voltage of today’s conventional BESS ranges up to 1.8 kV with specified current up to several kilo ampere and corresponding losses in the conductors and power electronics.



Experimental / Modeling methods

A FEM simulation of the complete large-scale BESS with thousands of individual cells is impossible due to limitations in computing capacity. Nevertheless, the potential distribution inside battery modules as well as between the individual high voltage battery modules has to be determined for an efficient isolation coordination. To overcome this issue a network model of the identical modules based on FEM is created. Afterwards the propagation of transient voltages is simulated with this network model, which lumped parameters are determined with FEM. The resulting voltage distribution at the network nodes is transferred back to the geometrical FEM model, where the resulting potential distribution is calculated.



Results / Discussion

The analysis of the resulting transient voltage distribution allows the evaluation of a geometric layout concerning transients in the isolation coordination of high voltage BESS.