Power system security with the consideration of economic dispatch

Operation of power systems demands a high degree of security to keep the system satisfactorily operating, if it is subjected to a disturbance. On the other hand, systems operation requires attention to economy. In this work, the proposed approach reconciled the possible conflict between dynamic security and economy requirements. Firstly, the pattern recognition technique was used to assess dynamic security. Linear classifiers, that determine the stability of the electric power system were developed and presented. This set of classifiers were added to the other system stability and operational constraints, in the quadratic programming, that has been traditionally used in economic studies. The problem was then formulated to satisfy a secure-economic preventative strategy. This strategy directly presented a solution, that ensured economy and security of the power system. The method has been tested by applying it to two test systems, usually used in the literature. The technique showed ease and applicability to different areas of power system analysis