基于SOC系统数据交互的保护装置设计

Design of protection device based on SOC system data exchange

大量数据运算和交换需要现场FPGA配合DSP进行处理,导致装置结构复杂、功耗增大,影响系统可靠运行。以片上系统芯片为基本架构,基于高速一致性接口和双倍数据率共享的数据交互机制,提出一种基于SOC系统的FPGA和ARM数据交互方法,可适用于智能变电站继电保护装置。该方法充分利用ACP接口带宽和SOC L2 Cache特性,通过ARM外挂的DDR存储器进行数据交互;同时,考虑到继电保护各种报文的优先级,对于报文采用严格优先级的调度方案,确保高优先级报文被优先传递。装置性能测试结果验证了该设计方案的可行性。

Currently, FPGA cooperated with DSP to carry out large amount of data operated and exchanged in the field protection device, and it leads to complicated structure and larger power consumption, which greatly influences the reliability operation of the protection device. Aiming at this problem, taking the SOC as the basic architecture, based on the high-speed conformance interface and data interaction mechanism of double data rate sharing, a data interactive method between FPGA and ARM was proposed for the intelligent substation protection relay in this paper. This method made full use of the ACP interface’s bandwidth and the Cache L2’s characteristic, and carried on the data exchange through the DDR store of the ARM plug-in. At the same time, considering the priority of various messages in relay protection, the scheduling scheme with a strict priority was adopted for the message, which ensured that the high priority message would be passed primarily. Finally, the performance testing proved the feasibility of the protection device.