Design of Transient Energy Regulation and Reuse Device of Flexible HVDC Transmission for Offshore Wind Power

The increasing significance of regulating transient energy and efficiently clearing DC short-circuit faults accompanies the rapid growth of offshore wind power. To address limitations such as single functionality and low device utilization in DC energy dissipation devices in flexible HVDC transmission systems for offshore wind power, this paper researches the technology of transient energy regulation and reuse, and a hybrid chopper topology with fault energy absorption and reuse function is proposed. The topology's structure, control strategy, and design methodology for electrical parameters are defined. Simulation is employed to verify the electrical characteristics of the hybrid chopper topology and its performance in an offshore wind power grid-connected system. When compared to traditional regulation methods, the proposed topology-based approach offers the advantages of energy absorption and fault location function for various DC faults. This method effectively maximizes the utilization of DC fault energy, resulting in higher device utilization rates and a broader range of functionalities.