基于FPGA的线路光纤纵差成套保护硬件设计

The Hardware Design of Fiber-optical Vertical-differential Line Protection Based on FPGA

针对现有光纤纵差保护装置中处理器性能不佳的问题,提出了以FPGA为核心的双CPU结构的光纤纵差成套保护硬件设计方案,并详细介绍了同步串行通信、数据采集部分的实现方法。该方案充分利用FPGA片内资源,实现光纤通信、GPS校时、实时时钟管理、A/D同步采样、通过内部双口RAM与其他CPU进行信息交互、I/O操作等功能。整个硬件方案配置精简、性价比高、电磁兼容能力强,基于该方案的实际装置已在工程中得到了应用。

Due to the bad performance of processor in fiber- optical vertical-differential protection device, the hardware design of fiber-optical vertical-differential protection based on FPGA and dual-CPU architecture is proposed in this pa- per. In addition, the design method of main parts, such as synchronous serial communication and data synchronization acquisition, is introduced in detail, in which the FPGA on- chip resource is fully utilized. Furthermore, such functions as optical fiber communications, GPS timing, real-time clock management, AD synchronous sampling, information exchanging between internal dual-port RAM and other CPUs, and I/O operations are realized. The entire hard- ware scheme has the characteristics of configuration simpli- fication, high performance price ratio and strong electro- magnetic compatibility. The actual devices based on pro- posed scheme have been applied to projects.