Artificial Short-circuit Test and Result Analysis of Ximeng UHV AC/DC Transmission Project

The prospect of “carbon peaking and carbon neutrality” determines the major role of power supply of renewable energy, and proposes higher requirements to the development of renewable energy as well. Due to the reverse distribution characteristics of the resource endowments and electricity load, most of the large-scale renewable energy is centrally sent out through long-distance AC/DC power systems, which makes the short-circuit ratio of multiple stations of renewable energy stations low, and the coupling characteristics of source and network complicated. Moreover, the problem of transient overvoltage caused by AC and DC faults is outstanding. Ximeng UHV AC/DC transmission project is the system with the world's largest scale of once-grid-connected wind power and the most complex wind-fire bundling transmission line. The introduced artificial short-circuit test in this paper is promoted with detailed plan, considering the actual situation of geography, wind resources, grid strength, etc., and carried out in different voltage levels and different operation modes. The multi-dimensions data such as grid voltage and wind turbine power response is recorded and analyzed comprehensively, and the characteristics of transient overvoltage and wind turbine power response of Ximeng UHV project are concluded, finally the direction of further research is discussed.