With the deep application of high power and remote UHV AC and DC transmission technology

the optimization allocation ability of grid resources in Jiangsu has made remarkable improvement

the proportion of receiving electricity in Jiangsu power grid has improved gradually and become into typical receiving grid

therefore the problem of insufficient dynamic reactive power compensation of system and voltage stability are becoming prominent. As for the problem existed in Jiangsu power grid

the adaptation study of phase modifier after connecting to Jiangsu grid is developed on the technology principle of arranging phase modifier at the receiving end grid and the solution to the short circuit current improvement after arranging the phase modifier in the Jiangsu power grid is proposed. It is shown by the simulation calculation analysis that phase modifier

after reasonable arrangement in Jiangsu power grid and during the fault period

plays the role of reactive power support

reduces locking probability due to failure of DC commutation so to solve the HV problem of south Jiangsu area in low load time such as Spring Festival. As for the short circuit current rise after connection of the phase modifier

it can be solved by way of adjusting grid structure at the premise of not reducing safety of grid supply.