Average voltage regulation in droop-controlled MTDC grids

Proper voltage regulation is vital for the operation of the Multi-Terminal High Voltage Direct Current (MTDC) systems as the former parameter is a direct indicator of the power balance in such grids. This paper investigates the issues with the control of the MTDC voltage when the average voltage regulation approach is used. Specifically, the system performance is evaluated when large communication latencies are present in transferring the required voltage information. For this purpose, eigenvalue analysis is conducted in Matlabl Simulink environment. Furthermore, alternate implementations of the control approach under study are discussed and their performances are compared by means of time-domain analysis conducted using SimPowerSystem toolbox.