System validation and field experience of MVDC network for linear PV power plant

Because current standards do not explicitly cover this application, the key assets were developed following technology principles of HVDC for converters and cable system, and of

MVAC for switchgear and cables. At first, system studies and simulations were performed defining transient fault withstand capabilities of the equipment. Considerable research effort has been further made to define strategy for protection, control and monitoring. It resulted in a need of common validation approach. Hardware-in-the-loop test bench was built, incorporating the controller of all AC-DC, DC-DC converters, switchgears and SCADA. Finally, validation of operational functionality and communication algorithms were completed in a full-scale laboratory setup. Installation of all equipment and site acceptance tests were finalized in 2025.

On-site measurements are now being conducted. Outlining the experiences gained during development and verification phases, the paper provides insights into the planning of MVDC distribution networks for linear PV collector use case. The results obtained through field operation of the pilot project will help to demonstrate the effectiveness and reliability of the overall system and allow its scalability for higher power.