Power Flow Analysis (using Gauss Seidel method) for 'n' buses

this code help to solve power flow problems using Gauss-Seidel method for any number of buses

this code help to solve power flow problems using Gauss-Seidel method for any number of buses.
the code contain data of 14 buses system written in the attached Excel file .
the program is not complete for all planed features like: ( adding capacitors at certain buses or fault calculation )
program calculations consider :
1- Ybus formation taking into account the mutual couplings and transformer ratio of elements
2- making iterations till the error become lower than .00001 per unit
3- u can activate the acceleration input factor
Note : system values (in per unit) must be entered in the excel sheet before the program run.