A NEW ECONOMIC-POWER DISPATCH METHOD WITH SECURITY

This paper first presents a network flow model and uses the out-of-kilter algorithm (OKA) for solving the on-line economic power dispatch with N and N - 1 security. A fast N - 1 security analysis method solved by the OKA is developed to seek out all the overconstrained cases for all possible single line outages, and then an 'N - 1 constrained zone' is formed which is coordinated with the network flow model. Based on the normal operating state, a corrective incremental network flow model of economic dispatch for the overconstrained cases is established. In consequence, the calculation burden is reduced significantly and the shortcoming of network flow programming is mitigated to some extent. The proposed model and algorithm are tested on an IEEE 30-bus system. Encouraging results are obtained.