Voltage Stability Analysis of Hunan Power Grid with Ningxiang UHVCD Fed into

In order to promote the cross-regional and cross-provincial consumption of new energy in Ningxia and enhance the ability of Hunan province's power security, the NX UHVDC project will be put into operation by the end of the 14th Five-Year Plan. It will be fed into Hengyang, Hunan Province, which will lead major changes to the stability characteristics of Hunan power grid . To improve the power transmission capacity of NX UHVDC, this paper analyzes the strength of Hunan receiving power grid by using indicators such as MISCR and MIIF. Then several simulations have been done to study to the transient voltage stability characteristics of Hunan power grid under different operation modes. In the end, 4 compensators are suggested to be installed in AC power grid at the receiving end to approve the stability of Hunan power grid.