Power System Operation and Control

1.3 OBJECTIVE FUNCTION AND CONSTRAINTS FOR THE ECONOMIC DISPATCH PROBLEM

As discussed earlier, the ED problem deals with the optimal allocation of total load demand P_D amongst n-number of units. The objective function for the ED problem is presented below.

The problem is to minimize the function Eq.(1.3) subject to the satisfaction of constraints.

 

C_Total = f (P_G1, P_G2, … , P_Gn)                    (1.3)

 

where C_Total is the total cost of generation and P_G1, P_G2,…, P_Gn are individual generations of n-number of units. The ED problem may be treated as parameter (cost) optimization subject to the satisfaction of system constraints. System constraints are of two types:

1. equality constraints,
2. inequality constraints.

Equality constraints

These constraints ...