Power System Operation and Control

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2.4 SOLUTION OF THE ECONOMIC SCHEDULING PROBLEM – CONSIDERING TRANSMISSION LINE LOSSES

For optimal power dispatch, the incremental fuel cost of each plant multiplied by its penalty factor should be equal to Lagrangian multiplier λ.

(IC)_i L_i = λ for i = 1, 2, …, n_g

where images = pentaly factor of i^th unit.

The incremental transmission loss can be obtained by differentiating the total loss equation P_L. The equation for P_L interms of B-coefficients has been developed earlier.

Recall the incremental cost of the i^th unit.

The incremental transmission ...

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