Study on the relationship between the power system reliability and load rate

Load rate adjustment strategies based on reducing peak and filling valley and the proportion of load shifting are presented, and the algorithm for the load adjustment is also presented. The relationship between the system reliability and the load rate is modeled using the spline interpolation method. Both the two load rate adjustment strategies can adjust the load demand between the peak and valley periods, the system load curve on the premise of satisfying the electricity demand for the peak load. In this way the system load rate can be decreased. The proposed model and method are used to the IEEE-RTS 79, and results indicate that with the increase of the system load rates, the system reliability increase in a non-linear way, which also means the reliability performance of power systems can be improved by increase the system load rate. However, when the loading rate increased to a certain extent, saturation will arise in the system reliability.