Research on the Optimal Design of a New Hybrid DC Energy Dissipation Valve

Abstract

DC energy dissipation valve is the core equipment of offshore wind power flexible and direct transmission system. It is of great significance for protecting the operation safety of converter valve equipment and restraining the over-voltage of the DC bus in case of an AC fault at the receiving end. However, DC energy consumption device has many topologies and novel structure, and their equipment construction cost and operation reliability are one of the important factors limiting their engineering application. In this paper, the topological structure of a hybrid DC energy consumption device is studied, and the distributed resistance parameters of a hybrid DC energy consumption device are optimized. Based on the optimization scheme, a new switching control strategy and voltage sharing strategy are proposed, which improves the technical and economic efficiency of hybrid DC energy consumption devices. The feasibility of the proposed measures is verified through simulation and experiment, which is of engineering significance.