中文摘要：

最大功率点跟踪（MPPT）技术是太阳能光伏发电系统的核心技术,如何进行快速、准确地跟踪,直接影响到整个光伏发电系统的性能。提出一种简单易行、快速、准确的最大功率点跟踪技术,并进行了仿真研究。最后对直流升压-逆变的两级拓扑结构设计的光伏逆变系统,进行了直流升压电路及其功率开关管IGBT驱动的硬件电路设计。驱动电路的测试结果表明,该驱动电路响应快、性能好、设计简洁,为MPPT技术的动态跟踪提供了有效的硬件基础。

英文摘要：

The Josang＇ s subjective trust model is studied. An evidence data preprocessing algorithm against mali- cious behavior is presented, experimental results indicate that trust can exponentially decrease with the increasing of the negative evidences so that malicious behavior is punished. An optimistic factor associated with entity subjectivi- ty and system state is constructed, and transitivity operator based on the optimistic factor is presented. Theoretical analysis shows that the new transitivity operator can adapt to the system state changes. Based on evidence data nor- malization, new consensus operators applied to conflicting opinion are proposed. Theoretical analysis and compari- son with other trust models show that these operators can improve the precision and robustness of the model, reduce the computational complexity.