【摘要】 智能变电站中如何通过无线传感器网络(WSN)将现场设备状态数据安全、可靠、低成本地传送到监控中心进行分析,是该领域的一个重要课题。首先通过实验研究,发现了WSN的通信链路存在高丢失率、非对称性等特点,由此提出了基于链路质量的路由量度算法———RETX(接收信号强度显示(RSSI)值+期望发包数(ETX))算法。该算法的核心思想是通过指数加权移动平均算法求得正向链路和反向链路的RSSI值,进而计算出成功发送一个包所需要的最小能量。将该算法应用于智能变电站在线监测系统中,在保证端到端可靠性的前提下延长了网络的使用寿命,为将WSN应用于智能变电站在线监测系统提供参考。更多还原

【Abstract】 In smart substation,it is an important topic that how to send device status data to the monitoring center securely,reliably and cost-effectively through wireless sensitive network(WSN).At first,it is found through experiment that several shortcomings of WSN communication link such as high loss rate,obvious asymmetry,etc.Then a RETX route metric algorithm based on link quality and containing received signal strength indication(RSSI) value and expected transmission count(ETX) is proposed.The RSSI value is calculated through an algorithm of forward link and reverse link,and furthermore the minimum energy needed for success sending a packet is also calculated.By using this algorithm to online monitor system of smart substation,the network duration of service may be extended,which offers valuable reference to the application of WSN in intelligent online monitoring system for smart substations.更多还原