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提出了一套新型的农乡配电网远程数据采集系统。分析农村地区传统通信方式所具有的建设成本高、数据丢失严重、抗干扰能力差等缺点。结合现代通信技术的发展现状,提出了以通用分组数据业务(GPRS)为数据传输平台,结合虚拟专网的隧道传输技术(VPN)的远程数据采集系统,克服了农村传统通信方式所具有的缺点。并针对数据通信的准确性进行了实验,实验表明,GPRS+VPN的通信方式可以在混乱的公共网络中架设一条独立、安全、稳定的通信隧道,从而实现分布式的RTU与监控中心之间稳定的无线通信,大幅度提高了数据传输的可靠性和安全性。同时,结合上位机软件程序的开发,整个系统能够实现农村地区无人值守、低成本、低维修费用的配电网数据采集与通信系统。 相似文献
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介绍了有关配电自动化的几个概念,对银河电力自动化公司配电自动化的项目技术从六个方面进行了 综述,指出了我国今后配电网的发展应注重的几个问题。 相似文献
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东深供水改造工程分水点的监控 总被引:5,自引:0,他引:5
徐文元 《中国农村水利水电》2003,(9):34-36
东深供水改造工程分水点共有30个,分属于3个子网;分水点的监控信息主要包括数字量、语音、图像等;每个量水闸RTU监控对象是分水点环网供电柜,分水流量计设备,流量调节阀,UPS供电设备等。 相似文献
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任凯 《辽宁农业职业技术学院学报》2013,(4):11-13
介绍了采用信息安全终端芯片SSX1014作为远程测控终端安全通信部分的设计方案。该方案实现了分散式采集与控制系统(SCADA)数据服务器和远程测控终端(RTU)之间的安全通信机制,并设计了RTU端的软硬件通信接口。 相似文献
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Loredana Lunadei Belén DiezmaLourdes Lleó Luis Ruiz-GarciaSusana Cantalapiedra Margarita Ruiz-Altisent 《Postharvest Biology and Technology》2012,63(1):74-84
This paper reports the development of image processing methods for the detection of superficial changes related to quality deterioration in ready-to-use (RTU) leafy spinach during storage. The experiment was performed on spinach leaves stored at 4.5 °C for 21 days (Set 1) and at 10 °C for 9 days (Set 2). Regarding Set 1, 75 units were evaluated beginning at time zero and after 7, 14, and 21 days of storage (treatments t1.0, t1.1, t1.2, and t1.3, respectively). In the case of Set 2, 24 samples were measured at time zero and after 3, 6, and 9 days (treatments t2.0, t2.1, t2.2, and t2.3, respectively). Multispectral images were acquired using a 3-CCD camera centered at the infrared (IR), red (R), and blue (B) wavelengths. Opportune combinations of these bands were calculated using virtual images, and a non-supervised classification was performed. A large number of spinach leaves belonging to Set 2 showed injuries due to the effects of in-pack condensation; thus, an image algorithm was developed to separate these defective leaves before applying the classification. For Set 1, Set 2 and all the calculated virtual images, the classification procedure yielded two image-based deterioration reference classes (DRCs): Class A, including the majority of the samples belonging to t1.0 and t1.1 (Set 1) and to t2.0 and t2.1 (Set 2) treatments and Class B, which comprised mainly the samples belonging to t1.2 and t1.3 (Set 1) and to t2.2 and t2.3 (Set 2) treatments. An internal validation was performed, and the best classification was obtained with the virtual images based on R and B bands. For each sample, camera classification was evaluated according to reference measurements (visible (VIS) reflectance spectra and CIE L*a*b* coordinates); in all cases, VIS reflectance values corresponded well with storage days, and Classes A and B could be considered homogenous with regards to L* and a* values. Taken together, these results confirmed that a vision system based on R and B spectral ranges could constitute an easy and fast method to detect deteriorating RTU packed spinach leaves under different refrigeration conditions. 相似文献
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介绍基于CAN总线的棉花膜下滴灌自动化监控系统中远程终端控制器的设计,详细阐述其硬件和软件的设计思路和程序流程图。系统选用的远程终端控制器(RTU)结构简单,工作可靠,已经成功应用于棉田滴灌控制系统。 相似文献
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借鉴SCADA系统结构,讨论了一种温室环境监控系统,系统采用CAN/1-Wire分级网络,布线方便,运行可靠;RTU以基于ARM CORTEX-M3核的STM32处理器为核心,外围模块丰富,数据处理能力强;HMI采用CAN TO USB模块,软件设计灵活,安装使用方便,同时给出了系统结构和实现关键细节。 相似文献