DC separation /
Common Mode Filter
The 2nd generation of the WSTECH APS Series for ESS is available with separated DC Inputs (DC split version). This option offers several advantages like higher DC-side short circuit level of 4x140kA covering the demand for long duration Energy storage systems, 4 completely independent controllable power units in one inverter block of up to 5MVA and an integrated common mode filtering for the DC inputs.
The common mode voltage (=high voltage against earth) on battery side appears with the separation of the DC inputs of two AC-side parallelized inverters. The included common filter protects the connected battery system against high voltages against earth and therewith against possible damages and reduced lifetime due to that effect.
The APS standard version (DC coupled) does not have relevant common mode voltages.
Want to learn more? Please refer also to the technical documents in section Media.