Research On Short Circuit Current Limiting Scheme Of Henan Power Grid

Henan power grid has developed rapidly to meet the needs of local power users,the construction of power grid scale continues to expand,region increase installed capacity,the construction of 500 kv substation and transmission line perfected the backbone network frame,the regional power relationship between more closely.The short circuit current level of Henan power grid is increased obviously,and the blocking capacity of some plant station switch equipment can not meet the requirements of the system and restrict the further development of power system.It is urgent to restrict the short circuit current level to reasonable range.This paper puts forward the solution of overshoot of the short-circuit current of Henan power grid based on the research of short-circuit power limitation measures.Firstly,in this paper,the principle and characteristics of the short-circuit current limiting measures are studied from the space truss structure optimization,the corresponding short-circuit current limiting technology and high voltage direct current transmission technology,the application scope of different limiting measures is clarified.The overall short-circuit current level of the grid is limited by reasonable grid structure planning and optimizing operation mode.Aiming at the load concentration in the power grid and the high density of power point density,the technical measures are used to restrict the short circuit current.Secondly,this paper analyses the situation of Henan power grid,the simulation software is used to calculate the overall short circuit current of Henan power grid.The basic conditions of short-circuit current research are introduced,including calculation conditions,calculation method and stability criterion.Finally,according to the data of Henan power grid 2014-2016,this paper studies the adaptability of short-circuit current limiting measures in Henan power grid.The solution to restrict Zhengzhou,Songshan,Huojia short circuit current is replace the switch,optimize the network frame structure and install the series reactor.The optimal limit scheme is determined by the stable check and scheme comparison without operation mode.The proposed scheme provide advice and reference for the network frame planning and short-circuit current limiting current of Henan power grid,which has the practical value of engineering.