Voltages with all emfs shorted   

 V1 = 0.13 /_-11.97 per unit
 V2 = 0.13 /_-11.97 per unit
 V3 = 0.13 /_-11.97 per unit 
 V4 = 0.15 /_-11.97 per unit 

 
 Resulting voltages are determined by superposition of voltages caused by injected current and emfs shorted to the node vo 
      ltage                                                                                                                

 V1 = 1.57 /_-10.81 per unit
 V2 = 1.56 /_-14.04 per unit
 V3 = 1.57 /_-11.41 per unit 
 V4 = 1.58 /_-11.97 per unit