Modelling and Control of Multi-terminal MVDC Distribution Network

The revolution in the power industry has motivated a paradigm shift in the multi-terminal voltage source converter (VSC) medium voltage DC (MVDC) distribution network application from ship to power grid with numerous market-based applications. However, research in MVDC networks in the power grid is in its embryonic stages, hence exploring the existing primary control schemes in the well-developed VSC-HVDC systems as the benchmark for adoption remains an interesting research subject. Therefore, this paper proposes a 10kV radial multi-terminal MVDC distribution network in PSCAD/EMTDC with solar PV integrated and a preliminary study involving modelling and comparison of the master-slave, voltage margin and droop control schemes undertaken. The results show that the droop control is the most responsive and flexible achieving the best network DC voltage control and active power balance in the MVDC distribution network. The growing research interests in MVDC control provides an impetus into future study on adaptive droop control schemes..