嵌入式以太网在变电站自动化系统中的实现

Implementation of Embedded Ethernet in Substation Automation System

以太网已成为变电站自动化系统通信的发展趋势。低压变电站自动化系统的间隔层设备硬件平台配置较低,通常难以引入实时操作系统(RTOS)及其TCP／IP协议栈。文中研究了在低硬件配置平台上实现嵌入式以太网通信软件的若干关键问题,提出了一种多任务分时、分层的以太网通信软件结构;对内存采用实时性较好的空间表进行管理,对报文采用动态的组织和管理方式;对间隔层设备的路由和地址解析问题,间隔层设备只实现地址解析功能,变电站的外出网关设定地址解析协议(ARP)代理功能,从而大大降低了系统的复杂性。另外,还针对以太网实现中的其他问题进行了讨论。

Applying Ethernet technology as the communication mode in the substation automation system （SAS） is a new trend. For the equipment located in the bay level of low voltage SAS is arranged low, and it is generally difficult to download the real-time operation system （RTOS） and its implementation of Ethernet communication protocols. This paper studies some key issues in the implementation of embedded Ethernet software, and puts forward an embedded Ethernet software implementation structure characterized by multi-task, time-sharing and layering. The space table method of fairly good real-time character is adopted to manage the memory, and message is organized in the dynamic mode. For the route and address resolution in the equipment located in the bay level of the substation, the equipment just supports the function of address resolution, and the gateway in substation is provided with the address resolution protocol （ARP） proxy, the implementation mode greatly reducing the complexity of the system. In addition, some other issues of the implementation of Ethernet are also discussed.