Máquinas Electricas

Mini Proyecto 1

Curva de Torque de Carácteristicas Externas de Generador Sincrónico

A 10.8-kVA, 208-V, Y-connected, 3-phase, synchronous generator supplies the rated load at 0.8 pf lagging. The synchronous impedance is j5 ohms/phase.

Using MATLAB

a)      Plot the external characteristics

·         Consider Ea constant and equal to the one obtained with rated load at 0.8pf lagging.

·         Use a range of current from 0 pu to 1 pu.

·         Consider power factors 0.1, 0.5, 0.8 leading and lagging, and unity.

Code to obtain External Characteristic graphic:

hold on

grid on

xlim([0 1])

ylim([0.5 3.5])

A=ezplot ('4.0625=(y*(0.1))^2+(y*(0.995)+1.25*x)^2')

set(A,'Color','y')

B=ezplot ('4.0625=(y*(0.5))^2+(y*(0.866)+1.25*x)^2')

set(B,'Color','m')

C=ezplot ('4.0625=(y*(0.8))^2+(y*(0.6)+1.25*x)^2')

set(C,'Color','c')

D=ezplot ('4.0625=(y*(1))^2+(y*(0)+1.25*x)^2')

set(D,'Color','r')

E=ezplot ('4.0625=(y*(0.8))^2+(y*(-0.6)+1.25*x)^2')

set(E,'Color','g')

F=ezplot ('4.0625=(y*(0.5))^2+(y*(-0.866)+1.25*x)^2')

set(F,'Color','b')

G=ezplot ('4.0625=(y*(0.1))^2+(y*(-0.995)+1.25*x)^2')

set(G,'Color','k')

legend ('0.1 lagging','0.5 lagging','0.8 lagging','Unity','0.8 leading','0.5 leading','0.1 leading')

xlabel('armature current [pu]')

ylabel('terminal voltage [pu]')

title('EXTERNAL CHARACTERISTICS')

External Characteristic