本发明涉及电力系统可靠性评估技术，具体涉及光伏直流升压汇集系统可靠性评估及灵敏度分析方法，研究影响光伏直流汇集系统可靠性指标的因素，建立考虑光伏组件、直流升压变流器和电缆故障概率的光伏直流汇集系统多阶故障模型，基于考虑电应力的元器件计数法估计直流升压变流器失效率，以1MW光伏电站直流汇集系统为例分析两种汇集拓扑的等效停运率和电量不足期望(expected energy not supplied，EENS)，对影响汇集拓扑可靠性的设备故障概率进行灵敏度分析，结果表明两种汇集拓扑的EENS均随故障率增加而变大，对汇集拓扑可靠性影响最大的是光伏组件，其次为变流器，最后为汇集电缆。
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