Research on the full DC collection and transmission scheme for the photovoltaic base in Southeast Tibet and its control strategy

Abstract

Southeast Tibet is rich in photovoltaic energy， and its large-scale utilization is in line with China's carbon peaking and carbon neutrality goals. Thus， it is urgent to choose an appropriate collection and transmission method. Limited by the natural environment and power grid construction conditions in southeast Tibet， the full DC collection and transmission scheme with the advantages of long transmission distance， no reactive power problems， and high efficiency is superior to the traditional AC scheme. Firstly， a recommended networking mode for a full DC collection and transmission scheme is proposed in view of the collection and transmission scenarios of a photovoltaic base in southeast Tibet. Secondly， the topology of the key equipment， such as DC transformers and energy dissipation devices， the system grounding scheme and its control and protection strategies are discussed. Finally， a simulation model of a 10， 000 MW photovoltaic full DC collection and transmission system is built in PSCAD/EMTDC， and the feasibility of the proposed scheme for the photovoltaic in southeast Tibet is verified.

Keywords

• southeast tibet
• photovoltaic base
• full dc networking
• dc transformer
• control and protection