Comparative study between hourly and daily generation maintenance scheduling

Abstract

This paper compares daily and hourly based generation maintenance scheduling, that both solved using mixed integer linear programming (MILP). Scheduling the maintenance based on hourly gives more advantages as compared to the daily in terms of security and operating cost. In the daily basis, the loading and unloading characteristic of a generator may not be satisfied as it neglects the ramp rates constraints on the consecutive days, while in the hourly basis, these constrains have been considered. Numerical case studies were evaluated on the 6-bus system, IEEE 118-bus system, and practical system. A comparative study is carried out between hourly and daily basis. The result shows that the operating cost obtained was lower when scheduling the maintenance based on hourly as compared to the daily. It can be summarized that a global optimal solution could be achieved using hourly instead of only local optimal achieved in the daily basis.