1. A DC grid allows for simple connection of solar panels and storage devices such as batteries and capacitors that inherently operate with DC.
2. Direct coupling via the DC grid allows for full use of braking energy – no need for braking resistors that dissipate heat.
3. Lower infeed power since the easily integrated storage devices can supply peak power. In the model application at project partner Mercedes-Benz this led to a reduction of peak in-feed power by 80%.
This means fewer ressources (transformer, current distribution) and reduced investment expense.
4. Higher availability: storage supplies enough energy for a controlled shutdown in case of power outages. When power is restored, one can simply resume production without the need to manually reset the devices or identifying and removing defective parts.
5. Many applications are already driven by devices such as frequency converters who in-ternally use a DC link. Connecting the DC links with each other makes the many AC-to-DC conversion steps redundant and allows for direct use of braking energy.
6. Easier off-grid operation enables uninterruptible power supply without extra effort, no additional components and reduced conversion losses.
7. Using DC less copper is needed for cabling – refer to question 4: For a 7.5 kW motor this means 50% less copper. In a DC grid the lo-cal AC-DC converters are redundant.