共查询到20条相似文献,搜索用时 156 毫秒
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在孤岛直流微电网中,母线电压是判断其稳定性和衡量电能质量的唯一指标。针对这一现象,在孤岛直流微电网中加入了由蓄电池-超级电容组成的混合储能单元来平抑微电网系统中出现的波动功率,同时对于超级电容控制器添加了补偿电流来提升控制精度,差额功率经过低通滤波器后,高频分量经超级电容器平抑,低频分量经蓄电池平抑,对于母线电压不论是瞬时恢复还是长期的稳定性都得到了保障。试验结果表明,不论是光照强度变化还是负载功率变化,含混合储能系统的微电网母线电压都能快速恢复至额定值,无论是电能质量,还是系统稳定性都具有一定的提升。 相似文献
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随着新能源发电技术的不断发展,接纳这些分布式电源的微电网也日益壮大,但分布式电源的输出功率具有间歇性且随机性强,影响微电网的运行及电能质量等。为了增强微电网的运行稳定性及供电质量,将储能系统应用到微电网结构中。而单一的储能系统已经不能满足微电网的需求,因此采用超级电容器和多硫化物溴电池(PSB)混合储能系统,利用超级电容的快速响应和功率密度大等特性快速填补微电网的功率缺失,当需要长时间提供电能时则由PSB来填补。超级电容器与PSB组成的混合储能系统兼具功率型和能量型储能元件的优点,可以更好的发挥储能系统在微电网中的作用。 相似文献
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高密度封装技术在近些年迅猛发展,同时也给失效分析过程带来新的挑战.常规的失效分析手段难以满足结构复杂、线宽微小的高密度封装分析需求,需要针对具体分析对象对分析手法进行调整和改进.介绍了X射线、计算机辅助层析成像(CT)技术、微探针和多方法联用等失效分析技术,分析了其原理和适用于高密度封装的优势.并结合两个高密度封装失效分析案例,具体介绍了其在案例中的使用阶段和应用方法,成功找到失效原因.最后总结了各方法在高密度封装失效分析中应用的优势、不足和适用范围. 相似文献
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《Circuits and Devices Magazine, IEEE》1997,13(3):24-26
A new 16Mb 3DM module has been developed that satisfies the requirements of high packaging density, high memory capacity, and low fabrication cost. The package density is four times that of TSOP. The module is fabricated by using four 4Mb-DRAM chips at low cost, and it is almost the same size as the single 4Mb-DRAM package (TSOP) currently in use. We also developed a new fabrication process for the module. A 3DM module has advantages in its size, high package density, and electrical performance. Applications that can utilize these advantages include supercomputers, workstations, memory cards, and space equipment 相似文献
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V. E. Ustimchik S. A. Nikitov Yu. K. Chamorovskii 《Journal of Communications Technology and Electronics》2011,56(10):1249-1255
A model of radiation generation process in active tapered double-clad optical fibers based on rate equations in the adiabatic
approximation is developed. The generation process in active tapered fibers with different geometric profiles and mirrors
at both ends alloyed with ytterbium is numerically simulated. The advantages of tapered fibers over cylindrical fibers are
demonstrated; these advantages include low power density, high output power, higher power slope efficiency, and smaller length
required for achieving similar output power. 相似文献
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This paper presents a new zero-voltage-switching (ZVS) bidirectional dc-dc converter. Compared to the traditional full and half bridge bidirectional dc-dc converters for the similar applications, the new topology has the advantages of simple circuit topology with no total device rating (TDR) penalty, soft-switching implementation without additional devices, high efficiency and simple control. These advantages make the new converter promising for medium and high power applications especially for auxiliary power supply in fuel cell vehicles and power generation where the high power density, low cost, lightweight and high reliability power converters are required. The operating principle, theoretical analysis, and design guidelines are provided in this paper. The simulation and the experimental verifications are also presented. 相似文献