Research on Transmission Scheme for Important Transmission Sections by Changing Original AC Lines into DC Lines

Affected by geographical conditions and construction conditions, the number and capacity of transmission lines connecting different regions are limited. Meanwhile, the power on each transmission line does not reach the rated capacity and the power flow distribution is uneven due to the grid structure in traditional power systems. Changing original AC lines into DC lines is provided for improving power transmission. DC system-based MMC is also discussed and designed. Simulation results demonstrate the feasibility and performance of the proposed transmission scheme.