调度自动化主站局域网冗余可靠性风险分析

电力调度依赖可靠的调度自动化主站,因此主站广泛采纳冗余技术。提出一种调度自动化主站局域网冗余可靠性测试方法。根据网卡绑定、虚拟路由器冗余协议、交换机堆叠等冗余测试结果,确定了地址解析协议轮询时间、虚拟路由器冗余协议抢占延时等配置参数的合理范围,揭示出生成树协议在链路频繁中断时对网络故障的放大作用。研究发现:在网卡主备模式下备用网卡状态难以得到实时监视,在网卡负载均衡模式下侦测不到非直连链路异常。在交换机堆叠后增加了非冗余潜在故障点,冗余多主检测机制可降低堆叠分裂风险。提出了冗余可靠性推荐方案,以指导局域网的设计、建设和运维。

Risk analysis on redundancy reliability of a local area network in the master station of a dispatching automation system

Power dispatch depends on a reliable master station of a dispatching automation system. To assit with reliability, redundancy technologies have been widely adopted. In this paper, a test method of redundancy reliability for a Local Area Network (LAN) in the master station of a dispatching automation system is proposed. From test results with such as Network Interface Card (NIC) bonding, Virtual Router Redundancy Protocol (VRRP), and switch stacking, the reasonable ranges of key parameters such as the polling period of Address Resolution Protocol (ARP) and the preemption delay of VRRP are determined. The amplification effect of the Spanning Tree Protocol (STP) on network abnormality is revealed when the link is frequently interrupted. It is found that the status of standby NIC is difficult to monitor in real time under the main-standby mode of NIC bonding, and the abnormality of non-directly connected links cannot be detected in the load-balance mode of NIC bonding. After the switches are stacked, non-redundant potential fault points are added, and redundant Multi-Active Detection (MAD) can reduce the risk of stack splitting. Redundancy reliability recommendations for different network configurations are proposed to guide the design, construction, operation and maintenance of an LAN. This work is supported by the Science and Technology Project of State Grid Corporation of China (No. 5108- 202040024A-0-0-00).