This paper introduces a new droop-based DC voltage control method

including the dead-band

for applications to the high-voltage direct current(HVDC)grid that utilizes the voltage-sourced converter(VSC)technology. The proposed droop-control also provides autonomous power balance for the HVDC grid. The droop-control method divides the VSC stations into four groups

activates the droop-control of each group based on a pre-specified voltage margin and uses an improved power-voltage characteristic for desirable VSC station dynamic performance. The feasibility and performance of the proposed control method are evaluated based on time-domain simulation studies on the PSCAD platform

using the IEEE 39-bus system in which a five-terminal

monopolar

VSC-HVDC grid is embedded. Each VSC station is a modular multilevel converter(MMC)with 401 levels. The study results show that the proposed droop-control method enables the HVDC-AC system to reach a new steady-state after transient events. This work is supported by State Grid Corporation of China(No. SGZJ0000BGJS1500265).