1. (55/100) Design using the DigSilent power systems software a 12 busbars transmission and distribution grid interconnected system (it should not be in a radial connection) with no less than three generators and three transformers. Elements specifications can be user defined. Perform: • A load flow calculation study • A single phase short circuit calculation study for at least 3 busbars • A three phase short circuit calculation study for at least 3 busbars • A multiple busbars and lines short circuit calculation study Provide description of your system, comments on the specifications of the elements used and comments on the obtained results. 2. (15/100) Add Static VAR compensators or Shunt capacitors/series capacitors to different busbars of your system and briefly describe the changes on the grid when you run a Load Flow Calculation. What are the main reasons for using these devices? 3. (10/100) Briefly describe how Generator's Primary and Secondary controller work? 4. (20/100) Describe how is controlled the reactive power and active flow direction in a grid system? Justify your answer through simulations on the designed grid. Use reference and no plagarisim 1500 words