New VSC-HVDC Solution with Overhead Transmission Line for BC-SIN Project

This paper mainly research on the Mexico's± 500 kV Baja California VSC-HVDC project (BC-SIN) which connects National Interconnected System (SIN) and Baja California grid (BC). In this paper, a new VSC-HVDC solution is proposed. Firstly, the main circuit and function requirements of BC-SIN VSC system are studied carefully. Optimal design on quantity and the scheme for placement of the high voltage (HV) elements such as ground return transfer switch (GRTS), high speed grounding switch (HSGS) are demonstrated in detail. Secondly the new half-bridge and full-bridge hybrid MMC topology considering DC fault ride-through is presented. Then the parameters of the main circuit of BC-SIN VSC system are designed. What's more, the hierarchical control and protection strategy are proposed. Finally, simulations on control and protection strategy are carried out and the result illustrates the validity of it.