Long Term Coordinated Generation and Transmission Maintenance Scheduling Considering Network Constraints and System Reserve

Generation or transmission maintenance scheduling packages provide preventive or corrective maintenance scheduling over a certain period in order to minimize system costs while fulfilling relative requirements. In advanced power systems inclusion of network constraints and increasing rate of electricity demand may result in higher number of generators and transmission lines and hence lower system reserve. In order to avoid this and make the maximum use of power system capacities periodic system maintenance programs should be implemented. This paper proposes a security constrained model for long-term Generation and Transmission Maintenance Scheduling (GTMS) problem. Since generation scheduling and transmission scheduling are in interrelation with each other, here a coordinated GTMS is proposed in which unit and transmission maintenance scheduling are modeled simultaneously. For more study, that is realistic network operation and security constraints as well as power system reserve are taken into account. Impact of load curve on the GTMS problem is investigated by a proposed penalty factor. Unlike some previous studies that consider a fixed period for all unit maintenance windows, here various maintenance windows are considered for the system that is more realistic. Furthermore, a one-year time horizon is considered for the study that is more practical. Considering problem, Mixed Integer Programming (MIP) is employed to obtain most accurate results. An IEEE 24-bus Reliability Test System is utilized for simulation and show the accuracy of results.