Fault Ride-through Demand of Large-scale Islanded Renewable Energy Connected to VSC-HVDC System and Its Key Technologies

The adaptability of renewable energy connected to the VSC-HVDC grid will become an important issue affecting grid operation. In particular, the complex interaction between renewable power generation and the power grid brings new challenges to the renewable power generation and VSC-HVDC grid to achieve fault ride-through. Therefore, it is necessary to study the fault ride-through strategies of the VSC-HVDC grid-renewable power generation combined system. According to the operating characteristics and adaptability of renewable energy clusters connected to the VSC-HVDC grid under different faults, this paper proposes technical requirements for high- / low-voltage fault ride-through of renewable power plants that are connected to the grid in island operation, and analyzes key technologies for renewable power generation dealing with AC faults at the sending end of the grid in island integration mode. It is expected to realize joint fault ride-through of renewable energy and VSC-HVDC, thereby increasing the availability of the system, contributing to the safe and stable operation of renewable energy and VSC-HVDC grid, providing technical support for the planning of large-scale renewable energy delivery methods, and effectively guiding the planning and design of renewable energy and VSC-HVDC grid