Traditional Intrusion Detection System （IDS） based on hosts or networks no longer meets the security requirements in today＇s network environment due to the increasing complexity and distributivity. A multi-agent di...Traditional Intrusion Detection System （IDS） based on hosts or networks no longer meets the security requirements in today＇s network environment due to the increasing complexity and distributivity. A multi-agent distributed IDS model, enhanced with a method of computing its statistical values of performance is presented. This model can accomplish not only distributed information collection, but also distributed intrusion detection and real-time reaction. Owing to prompt reaction and openness, it can detect intrusion behavior of both known and unknown sources. According to preliminary tests, the accuracy ratio of intrusion detection is higher than 92% on the average.展开更多
有源电力滤波器(active power filter,APF)是电力系统中实现谐波治理功能的一种新型变流设备。谐波检测作为APF的关键技术之一,直接决定了其整体性能。针对近来出现的一类基于直接交交变换技术的APF,提出一种新的谐波检测算法。该算法...有源电力滤波器(active power filter,APF)是电力系统中实现谐波治理功能的一种新型变流设备。谐波检测作为APF的关键技术之一,直接决定了其整体性能。针对近来出现的一类基于直接交交变换技术的APF,提出一种新的谐波检测算法。该算法结合改进的滑窗离散傅里叶变换法以及对称分量法,实现对三相电网各次谐波的各序分量的独立的快速检测。新算法与传统方法相比具有简单快速的优势。尤其是当系统不平衡时,需要在每个谐波频率上对正序与负序分量分别检测的应用场合。此外,该算法同样可用于传统的APF中以实现快速的谐波检测。首先对新型直接交交型APF进行简要的介绍,再详细推导新的谐波检测算法的原理,并将该算法与传统算法进行比较研究。然后基于新的谐波检测算法针,对新型APF提出一整套滤波控制解决方案。最后对新的谐波检测算法进行仿真验证,并在一台3k W新型APF样机上对其进行实验验证,仿真与实验结果证明了新算法的正确性与实用性。展开更多
基金Supported by the Key Program of Natural Science Foundation of China(050335020)
文摘Traditional Intrusion Detection System （IDS） based on hosts or networks no longer meets the security requirements in today＇s network environment due to the increasing complexity and distributivity. A multi-agent distributed IDS model, enhanced with a method of computing its statistical values of performance is presented. This model can accomplish not only distributed information collection, but also distributed intrusion detection and real-time reaction. Owing to prompt reaction and openness, it can detect intrusion behavior of both known and unknown sources. According to preliminary tests, the accuracy ratio of intrusion detection is higher than 92% on the average.
文摘有源电力滤波器(active power filter,APF)是电力系统中实现谐波治理功能的一种新型变流设备。谐波检测作为APF的关键技术之一,直接决定了其整体性能。针对近来出现的一类基于直接交交变换技术的APF,提出一种新的谐波检测算法。该算法结合改进的滑窗离散傅里叶变换法以及对称分量法,实现对三相电网各次谐波的各序分量的独立的快速检测。新算法与传统方法相比具有简单快速的优势。尤其是当系统不平衡时,需要在每个谐波频率上对正序与负序分量分别检测的应用场合。此外,该算法同样可用于传统的APF中以实现快速的谐波检测。首先对新型直接交交型APF进行简要的介绍,再详细推导新的谐波检测算法的原理,并将该算法与传统算法进行比较研究。然后基于新的谐波检测算法针,对新型APF提出一整套滤波控制解决方案。最后对新的谐波检测算法进行仿真验证,并在一台3k W新型APF样机上对其进行实验验证,仿真与实验结果证明了新算法的正确性与实用性。
