During the DC-INDUSTRIE2 research project, a system concept was established that describes an open system for the efficient integration of renewable energies with reduced energy requirements for sustainable production. "With direct current technology, we were able to achieve a 50 percent reduction in copper use and power loss in cables in existing systems," says Hartwig Stammberger from Eaton, coordinator of the project and chair of the board of the successor organization Open DC Alliance. In addition, complete recovery of braking energy and a significant reduction in peak power demand has been achieved.
The previously published 2022 version has been extensively reviewed and now also deals with the parallel connection and grid serviceability of active infeed converters (AIC), changes to the grid shape in the event of islanding and decentralized power generation systems. Furthermore, the chapters on grid control and grid stability as well as overcurrent and overvoltage protection have been revised and clarified. An appendix has been added including test results, planning and design examples and information on operation and safety. "Thanks to the revision, the planning of our own systems can be carried out even more precisely and the system concept can be used as a basis for future standardization," Stammberger continues.
The system concept is the basis for the implementation of several model applications with direct current, one of the largest examples being the NExT-Factory as a new location for production, logistics and development of Schaltbau, one of the founding members of ODCA. By implementing the DC-INDUSTRIE concept, the infeed power of the high-bay warehouse was reduced by 85%. This reduces the load on the supply network and lowers running costs. The DC-INDUSTRIE system concept is also used in other applications and serves as the basis for future standards. Thanks to the active involvement of ODCA members, the content is incorporated into IEC technical report TR 63282 “Assessment of standard voltages and power quality requirements for LVDC systems”, for example.