An Approach to Re-dispatch Generators Based on the Modified Power Flow Jacobian Matrix

This paper focuses on the problem of re-dispatching the active power generation in order to increase the loadability of the power system. The continuation power flow is used to provide a sequence of solutions from a base case to the maximum power demand. The power flow problem solved through Newton-Raphson during the application of the continuation method is modified to include an additional equation relating the active power transmission loss and the active power generation of a critical area. This modification allows to re-dispatch the active power generation in order to reduce the transmission loss, which is shown to increase the power system loadability. The generators available to re-dispatch are identified by using sensitivity relationships, obtained as a sub-product of the continuation method. Numerical results obtained with the IEEE 57-bus test system are used to show the performance of the proposed approach.