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An improved automatic voltage coordination control strategy(AVCCS) based on automatic voltage control(AVC) and battery energy storage control(BESC) is proposed for photovoltaic grid-connected system(PVGS) to mitigate the voltage fluctuations caused by environmental disturbances.Only AVC is used when small environmental disturbances happen,while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen.An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process.A benchmark low voltage distribution system including PVGS is established by using the commercial software DIg SILENT.Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547,and the installed battery capacity is also reduced.Meanwhile,the battery’s service life is extended by avoiding frequent charges/discharges in the control process. 相似文献
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闫五中 《初中生学习(中考新概念)》2014,(10)
正20世纪60年代开始,美国麻省理工学院媒体实验室便率先提出"可穿戴技术"的概念。顾名思义,利用可穿戴技术生产出来的可穿戴设备,是指可以直接穿在身上,或者整合到人的衣服或配件里的一种便携式设备。设想中的可穿戴设备不仅能独立成为一种硬件设备,而且能够通过软件支持、数据交互以及云端交互实现各种强大的功能。有人预言,可穿戴设备将为人们的生活、感知带来巨大的转变。 相似文献
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<正>OPPO N1 mini现身FCC新浪手机讯5月21日上午消息,日前OPPO新机OPPO N1 mini现身FCC,该机将延续N1经典的旋转镜头设计,也是OPPO产品中首款衍生mini机型。根据FCC的显示,OPPO N1 mini正式型号为OPPO N5116,采用了5.0英寸720P屏幕,相比N1的5.9寸1080P屏幕缩水不少。电池容量也将为2140毫安时,没有缩水的只有,N1 mini也采用了可以206°旋转的1300万像素堆栈式镜头,仅用一颗摄像头就同时具备了前后摄像头的功能。芯片方面未公布,但普遍猜测为联发科MT6592及三星Exynos 5422两个版本。 相似文献
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Recently, the multi-hop cellular networks have been widely studied in order to enhance the cell performances such as the cell
capacity. While most of these works merely use the multi-hop methods instead of direct transmission without considering the
co-channel inter-cell interference, signal transmission mode and the effects of the number of antennas. With the consideration
of above important elements, this paper proposed an improved cellular system with multi-relay amplifies-and-forward (AF) cooperative
transmission scheme and the corresponding capacity expression is derived under the corresponding environment. By using the
potential space diversity and selecting relays based on maximizing the capacity, the cellular system capacity can be improved
effectively. The simulation results show that with the assistance of optimal selected relays, the improved cooperative cellular
system capacity with multi-relay AF transmission scheme performs better than single-hop cellular system. 相似文献
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主要介绍了智能微电网系统,以及蓄电池在智能微电网系统中容量的选取和蓄电池组的设计方法,蓄电池的容量和电池组的设计同时要符合双向变流器的要求。 相似文献
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随着调度自动化、通信技术水平的不断发展,厂站端采用无人值班的运行方式已逐渐普及,但直流系统的运行状况,始终制约着最后厂站端是否撤人的关键因素之一,从选型配置、优化功能入手,进一步提出改进的建议。 相似文献
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