Generation Maintenance Scheduling by Security Coordination Considering Transformer Maintenance

The common maintenance scheduling problem in restructured power systems is addressed. When Independent System Operator(ISO) receives scheduling plans from multiple independent GENeration COmpanys (GENCOs), which seek to maximize their own medium-term profits, it tries to trade off the generation cost and the reliability of the system, thus reschedules the maintenance plans of the GENCOs. This paper brings in the effects of transformer maintenance, never considered in such problem before, and discovers interesting and useful phenomenons that would help us to deal with a more realistic power system. Based on the information of bus-wise unserved energy, we develop an original algorithm for ISO to send corrective signals to the GENCOs for altering their maintenance schedule. An iterative scheme is used between GENCOs and ISO until the system fulfills acceptable reliability. Finally, a case is carefully studied to show the effectiveness of our method.