发电系统可靠性随负荷率变化规律研究

Study on the Power System Reliability Variation with Load Rate

摘要: 基于削峰填谷和等比例调整等负荷率调整策略，提出调整策略对应的负荷调整算法；基于此，建立系统可靠性指标随系统负荷率变化的样条插值模型。两种负荷率调整策略均针对给定时段(如一年或一天)内，在满足负荷电能需求下，调整负荷谷峰差及负荷曲线，即在系统平均负荷不变的前提下改变系统最大负荷及其他时段负荷，以达到提高负荷率的目的。应用IEEE-RTS 79系统验证了模型的有效性。算例表明：随着系统负荷率的提高，系统可靠性呈非线性上升规律，即提高系统负荷率可提高系统可靠性；但是，当负荷率提高到一定程度时，系统可靠性的提高会出现明显的饱和现象。

Abstract: 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 rela-tionship 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 peak-valley difference and the load curve satisfying load demand in a given period of time; that is, the maximum load and the load in other times of the system are changed with the same average load in order to improve load rate. The validity of the model is verified using the IEEE-RTS 79 system. Results indicate that with the increase of the system load rate, the system reliability increases in a non-linear way, which also means the reliability performance of the system can be improved by increasing the system load rate; however, when the loading rate increases to a certain extent, saturation will arise in the sys-tem reliability.