计及风电和小水电的发电系统可靠性评估研究

Research on reliability evaluation of power generation system considering wind power and small hydropower

根据分布式电源随机输出功率的特点,利用集群技术,将较多的机组出力状态集合成较少的组群,建立了风电多容量机组可靠性模型和小水电机组改进的双状态模型。针对现有发电系统停运容量模型存在计算繁琐的问题,运用停运容量预备表优化排序,减省计算步骤和时间。将容量模型和日尖峰负荷模型结合,形成新型发电系统的裕度评估体系,采用某含多风电场和遍布小水电的地区的发电系统作为算例,编制MATLAB程序计算了一系列可靠性指标,定量分析了分布式电源对发电系统可靠性的影响。

A reliability model of multiple capacity units and an improved dual state model of small hydropower are established, which synthesizes more states of unit＇s output power to less groups by clustering technology according to the random characteristics of DG power output. The outage capacity preliminary sorting table is created instead of the cumbersome calculation of outage capacity probability model to reduce the calculation steps and save time. The capacity model and daily peak load model are combined to a new power generation system margin assessment system. Taking an actual power generation system with many wind farms and small hydropower stations as an example, influence of DG on power generation system is analyzed by reliability indexes calculated by MATLAB program.