CONSTRUCTION OF GENERATOR CAPABILITY A CURVES
construction of generator ca atcs ca atcs capability curves
construction of generator ca atcs ca atcs capability curves
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<strong>CONSTRUCTION</strong> <strong>OF</strong> <strong>GENERATOR</strong><br />
<strong>CAPABILITY</strong> CURVE<br />
• Determination of P-Q curve by a new method<br />
• The values of excitation current (I f ) can be calculated using the following<br />
expression (which is derived from a triangle <strong>OF</strong> R F R ', Figure 3):<br />
i<br />
fR<br />
[ i + ( x − x )( s / u)(sin<br />
ϕ cos ∂ + cosϕ<br />
sin ∂)<br />
] 2 + [(<br />
x − x ) ⋅(cosϕ<br />
cos ∂ − sin sin ∂ ) ] 2<br />
= ϕ<br />
fP<br />
d<br />
P<br />
d<br />
P<br />
• For given (nominal) value of excitation current (i fn =i fR =Const.) )<br />
• Corresponding values of active power (P Gi ) are calculated,<br />
• the independent variable takes the value of reactive load Q Gi ≡ Q Gi,cosφ≈<br />
• For a given value of excitation current I f1,max<br />
= 2550A:<br />
Gi,cosφ≈0.<br />
• the series of given values of reactive and active power were obtained,<br />
• the corresponding P-Q dependence is obtained (Figure 6).
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