Research Of Substation Access In Regional Power Grid

Due to the particularity of the development of Yulin regional power grid,it is different from the open-loop operation of 110 kV voltage grade power grid as the development mode of distribution network in eastern China,and the loop operation of 110 kV power grid as the backbone network.In this way,the analysis and demonstration of 110 kV substation connected to 110 kV regional 110 kV large-loop network can not be equivalent to the analysis and demonstration of general 110 kV open-loop distribution network.As the main index of open-loop distribution network access analysis,the analysis and demonstration of power balance obviously can not fully reflect the advantages and disadvantages of 110 kV substation access to the regional power grid.Substation access analysis is a kind of power grid analysis when the power grid structure,equipment parameters and system operation conditions are known,it is an important analysis method in the field of power system planning and dispatching operation.This paper will be based on the specific situation of substation access in this region,around the special 110kV multi-power ring network structure around the regional power grid,break through the simple electricity balance analysis,take grid power flow analysis and bus short-circuit current calculation methods,especially the innovative use of line loss analysis methods in access analysis,finally,ETAP PowerStation software was used to analyze and calculate the results in four modes.Based on the comprehensive analysis and comparison of the various schemes in the calculation of the bus voltage after the substation is connected,the variation of the total line loss in the local power grid,and the size of the bus short-circuit current,the Langanbao substation been accessed to the Dabianyao is preferred.