tailieunhanh - Annual preventive maintenance scheduling for thermal units in an electric power system

The system approach to the problem of preventive maintenance scheduling for thermal units in a large scale electric power system is considered in this paper. The maintenance scheduling program determines a set of thermal units maintenance switch off for a time period of one year. This paper considers the application of dynamic programming and successive approximations method in determination of annual thermal unit maintenance schedules. | Yugoslav Journal of Operations Research Volume 20 (2010), Number 2, 261-273 DOI: ANNUAL PREVENTIVE MAINTENANCE SCHEDULING FOR THERMAL UNITS IN AN ELECTRIC POWER SYSTEM Rodoljub TONIĆ Institute "Mihajlo Pupin" Belgrade, Serbia Milan RAKIĆ RAKING doo, Belgrade, formerly with Institut "Mihajlo Pupin". Received: March 2010 / Accepted: November 2010 Abstract: The system approach to the problem of preventive maintenance scheduling for thermal units in a large scale electric power system is considered in this paper. The maintenance scheduling program determines a set of thermal units maintenance switch off for a time period of one year. This paper considers the application of dynamic programming and successive approximations method in determination of annual thermal unit maintenance schedules. The objective function is multiple component and consists of system operation costs and system reliability indices (loss-of-load-probability and expected unserved energy). The evaluation of these costs is performed through a simulation method which uses a cumulant load model. The software package, developed in FORTRAN and integrated with an ORACLE data base, produces many useful outputs. Keywords: Preventive maintenance, maintenance programming method, successive approximations. scheduling, thermal units, dynamic AMS Subject Classification: 90C39,90B25. 1. INTRODUCTION The complexity, continuous growth and request for increase of reliability of operation of electric power systems require the introduction of a systems approach to thermal generation units and transmission lines maintenance scheduling. Maintenance costs reach considerable amounts and record annual increases of 15-20%. The electric power system maintenance scheduling problem is also very important from resource 262 R., Tonić, M., Rakić / Annual Preventive Maintenance Scheduling utilization standpoint, because an average generator maintenance switch off lasts about 45 days. This amounts to