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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。
How to transmit the status data of field devices to the monitoring center for analysis in a smart substation through the wireless sensor network (WSN) in a safe, reliable and low-cost manner is an important issue in this field. First of all, through the experimental research, it is found that the WSN communication link has the characteristics of high loss rate and asymmetry. Therefore, the routing metric algorithm based on link quality, RETX (Received Signal Strength Indicator (RSSI) + Expectation Number of packets (ETX) algorithm. The core idea of this algorithm is to calculate the RSSI value of forward link and reverse link by means of exponential weighted moving average algorithm, and then calculate the minimum energy needed to successfully send a packet. The algorithm is applied to the intelligent substation on-line monitoring system, which prolongs the service life of the network under the premise of ensuring the end-to-end reliability and provides a reference for the application of WSN in the intelligent substation on-line monitoring system.