Design of the small microstrip antenna based on the WLAN/UWB wireless communication system

The antenna,as the component of receiving and sending signals in the front end of the wireless communication system,plays an important role in the communication quality,and is often the main obstacle to the development of the miniaturization of the wireless communication system.The microstrip antenna is composed of a metal radiation patch which can be pasted on the dielectric substrate.The choice of the shape of the metal patch can be arbitrary.The conventional shape is usually chosen as the metal patch to simplify the analysis and prediction of its performance.The dielectric constant of the microstrip antenna substrate is relatively low in order to enhance the field intensity of the edge radiation field.However,the dielectric constant of the substrate needs to be greater than 5 in order to meet the needs of other performance of the microstrip antenna,so that the radiation edge effect cannot be enhanced,resulting in the greater contradictions.

Information acquisition technology for small hydropower stations in remote areas based on high-and low-orbit satellites

With a lack of coverage in private and public power communication networks,especially for collection of information from hydropower stations in remote areas,communication coverage is a significant issue.Satellite communication provides a large coverage area suitable for a variety of services and is less affected by geographical factors;moreover,the costs are independent of the communication distance.This study investigates information acquisition technology for small hydropower stations in remote areas using high-and low-orbit satellites.The information collection needs of small hydropower stations in remote areas are analyzed,and an information acquisition system is designed using high-and low-orbit satellites.For network security protection,network anomaly detection technology based on a support vector machine algorithm is proposed.The effectiveness of information collection was evaluated and verified for small hydropower plants in remote areas.The system provides technical support for“full coverage,full collection,and full monitoring”of the measurement automation information acquisition system.

基于无线传感网的中小型水电站泄水闸门自动控制方法

为解决现有控制方法在中小型水电站泄水闸门控制中剩余水量超出安全范围且流量较大的问题,本文提出一种基于无线传感网的中小型水电站泄水闸门自动控制方法。采用无线传感器网络采集实时水位数据,使用簇首节点对簇群中的所有边缘节点进行数据融合,将这些数据传送给协调器。利用小波包分解法提取闸门异常的特征,获得信号的子空间信号能量。计算信号子空间的异常值,确定需要控制的目标。运用PID法调整控制参数,获得最优指标参数。根据规则进行修正完成自动调节闸门控制。实验结果表明,实验组的剩余水量在安全范围10~20t之间;编号E1~E8的阀门随着开度值的变化,其流量均在65t之内,达到了预期目标。能够精准控制阀门开度,合理调整水流通过阀门的流量,使其能够达到安全目标。

基于Android平台的小水电信息管理系统

针对我国小水电点多、面广、分散,科学管理受制约的特点,开发了基于Android平台的小水电信息管理系统,从系统结构、框架和功能方面详细阐述了系统设计构建方法,该系统具有交互方便、可扩展性强、网络通信方便、运行稳定、消息推送丰富等特点,系统在云南省小水电管理中的成功应用验证了系统设计的合理性和实用性。

规模化小水电群电站快速调节系统远动通道的实现及应用

为实现规模化小水电群与风、光、水、气多种能源联合运行,平抑风电、光伏等新能源并网给电网造成的波动,针对规模化小水电群稳定、可调且调节快速的特点,开发了水电站侧集水电站有功功率和无功功率快速调节功能为一体的嵌入式控制器,使参与调节的各个小水电站具备功率快速协调控制的能力。为实现规模化小水电群按照远方控制策略进行闭环控制,需建立远程主站与水电站间闭环控制的远动通道,针对小水电站的实际特点,提出了利用调度数据网及无线通信两种方案。工程示范应用表明,实现了水电站功率快速调节系统与远方电站快速调节主站的闭环、协调控制。

电力线与无线融合技术在江西中小水电信息采集中的应用

为了解决江西省中小水电由于地处偏远山区并网管理难度大的问题,文章提出了电力线与无线融合新技术,该技术通过载波+无线的方式为中小水电的信息采集提供了有效的传输通道。通过载波机、柱上控制器和一体化电容耦合器实现远程监测,通过无线和公网GPRS实现用电信息的采集,从而解决了单一通信方式无法解决的通信可靠性问题。最后给出了具体的组网方案和实施结果,测试结果表明最大包长为250 B时,时延300 ms,正确率达100%,满足配用电业务需求。文章的成功试验对中小水电的开发具有促进作用。

小水电运行数据调度自动化主站接入系统研究

针对小水电站信息难以上传调度自动化系统,无法实现集群调控的问题,采用无线公网信息安全接入技术,利用微型纵向加密装置建立三层安全接入防护体系,将小水电站信息连通调度自动化系统。结果表明,该方法解决了小水电站信息接入问题,不仅突破了地域、光缆资源等限制,还有效降低了维护总成本,极大提高了电力系统运行管理水平,保证了电力系统安全稳定运行。