柔性直流电网故障电流抑制关键技术与展望

Energy crisis and reform bring great challenges to the traditional power transmission mode, and flexible DC power grid have become one of the new power transmission modes because of its flexibility, controllability, and high efficiency. However, there are still many problems to be solved in the key technologies and equipment. In this paper, the problem of fault current suppression in flexible DC power grids is taken as the research object. Firstly, the technical requirements of the fault current suppression in flexible DC power grids and the state of the art at home and abroad are analyzed. On this basis, the key technical problems to be solved and research ideas are proposed from the aspects of fault current distribution characteristics and evolution laws, fault current limiting principles and the multi-dimensional collaborative suppression, and digital physical dynamic simulation, etc. Finally, some important issues that still need to be solved in the research of flexible DC power grids are summarized and prospected.