E4102- DC MOTOR CONTROL (ANSWER) - Tutorial 4

 E4102- DC MOTOR CONTROL (ANSWER)  

Tutorial 4

1.                   Supply voltage = 450V dengan circulating current= 1550 A. I_d1= 1850 A, I_d2= 350 A. If line voltage =357V for both converter, calculate:

                                 i.            Power for converter 1 and 2.    

P₁        =             E_d1I_d1

                                 =             450 x 1850

                                 =             832500 W

P₂    =              450 x 350

                                =              157500 W.

(2 marks)

                                ii.            Input active power.

P      =              P1 – P2

                                =              832500– 157500

                                =              675000W

(2 marks)

                              iii.            Triggering angle for converter 1 and 2.

                   E_d1             =  1.35E cos a₁

   450        = 1.35 x 357  cos a₁

   cos a₁   = 0. 0,9337

                        a₁     =  20.98°

                       a₂      =  180° - a₁  

               =  180° - 20.98 °

                                =  159.02°

(2 marks)

                              iv.            Input reactive power.

           Q₁                 =  P₁tan a₁    

                                = 832500 tan 12.61°

                                = 319 230 var

Q₂            =  P₂tan a₂    

                                = - 157500 tan 159.02°

                                =  -60 396 var       

                Q             = Q₁ + Q₂  =  379626 var

(4 marks)