Research On Partition Power Supply Scheme Of 220kV Grid Of Jibei Tangchengqin Area

With the rapid growth of China's economy,the power grid develops rapidly.With the continuous improvement of the network structure,the electric magnetic ring network as the periodic product in the development of the power system is becoming less and less suitable for the further expansion and development of the power grid.The 500kV/220 kV electromagnetic ring network is the most common form of high and low voltage electromagnetic ring network.It is the main trend of the development of the power grid to carry out the loop network and realize partition power supply.This paper analyzes the 500kV/220 kV electromagnetic ring network of Tangchengqin power grid.It is concluded that the partition power supply scheme of 220 kV power grid is used to guide the planning and construction of the actual power grid,which has certain practical significance.Firstly,in this paper,the concept of electric magnetic ring network and partition power supply is analyzed,and the key problem of electromagnetic ring network is clarified.The electric magnetic ring network mainly includes four forms,namely,high and low voltage electromagnetism ring network,two main transformer parallel operation,multistage double loop feed supply and power plant incorporation into two power operation modes.In the process of electric magnetic ring network,the demand is considered in four aspects: safety and stability of power grid,system short-circuit current level,power balance in partition and operation economy,this paper introduces the timing,principle and procedure of the power grid.After the annulus,the power supply structure is formed,which has many advantages such as reasonable flow distribution and low short circuit current.And then this paper introduces the general situation of Hebei power grid,including the overall structure of the system,substation and power supply information,load level and other key information.The power transmission level of the main contact line in Tang ChengQin area is obtained through tidal current calculation.The short-circuit current in the region is calculated by short-circuit current,and the site with short circuit current limitation is clearly defined.The load rate of the main transformer substation in the region is calculated by simulation,and n-1 scanning is performed on the whole network.Finally,the power supply scheme of 220 kV power grid in Tangchengqin area was developed.Tangshan,Qinhuangdao power network analyses,Tangshan-Chengde power network analysis and internal power network analysis of electromagnetic loop network,formed the Qinhuangdao partition,partition of Chengde,Tangshan partition,partition in the northeast,northwest central partition and partition,a total of six partition in the south.The stability checking and tidal current calculation of the power grid after the partition is carried out,and the power balance and the main variable load rate are evaluated.