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级联多电平技术在动态电压恢复器中的研究 被引量:8
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作者 周雪松 何杰 +1 位作者 马幼捷 张智勇 《高电压技术》 EI CAS CSCD 北大核心 2008年第6期1189-1194,共6页
为了改善电压跌落引起的电能质量降低,分析了电压移位脉宽调制技术后,设计了一种应用十一电平级联逆变结构的无串联变压器的动态电压恢复器(DVR)。该技术基于同相位(IPD)电压移位调制方式对级联逆变结构进行调制,系统采用了改进的"... 为了改善电压跌落引起的电能质量降低,分析了电压移位脉宽调制技术后,设计了一种应用十一电平级联逆变结构的无串联变压器的动态电压恢复器(DVR)。该技术基于同相位(IPD)电压移位调制方式对级联逆变结构进行调制,系统采用了改进的"abc-dq"变换检测算法准确、快速检测系统电压的幅值和相位准确,并采用最小电压补偿策略补偿电压跌落。仿真结果表明,该技术提高了逆变器的开关频率,谐波失真小、电压变化率低,完全满足DVR对高电压质量要求的需要。 展开更多
关键词 级联多电平结构 动态电压恢复器 电压跌落 电压移位调制 同相位排列 “abc-dq”变换 最小电压补偿策略
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Synchronization of Chaotic Intensities and Phases in an Array of N Lasers 被引量:5
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作者 SUNJian ZHUShi-Qun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2期233-239,共7页
A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic syn... A linear array of N mutually coupled single-mode lasers is investigated. It is shown that the intensities of N lasers are chaotically synchronized when the coupling between lasers is relatively strong. The chaotic synchronization of intensities depends on the location of the lasers in the array. The chaotic synchronization appears between two outmost lasers, the second two outmost lasers, etc. There is no synchronization between nearest neighbors of the lasers. If the number of N is odd, the middle laser is never synchronized between any lasers. The chaotic synchronization of phases between nearest lasers in the array is examined by using the analytic signal and the Gaussian filter methods based on the peak of the power spectrum of the intensity. It can be seen that the message of chaotic intensity synchronization is conveyed through the phase synchronization. 展开更多
关键词 chaotic synchronization intensity phase linear array solid state lasers
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