基于自适应采样算法及数据处理的过程层设备时延优化设计

智能变电站与传统变电站相比,二次保护系统中增加了过程层设备合并单元及智能终端,引起了保护设备动作时间变慢。提出将合并单元的单一插值采样算法改为同步采样算法与插值算法相结合,基于同步状态自适应调整采样算法,减小了合并单元内部采样数据的处理时延。针对智能终端的CPU插件进行了改进,由FPGA完成GOOSE组播过滤、网络风暴功能,CPU负责处理GOOSE的接收与发送,同时采用MOSFET光电耦合继电器作为启动继电器,通过优化设计减少了智能终端的出口时间。基于上述设计,研制了新型过程层装置,并对比开展了动模仿真及静模仿真验证。仿真试验结果表明,新研制的过程层装置配合线路保护装置的整体动作时间相比优化前减少3 ms,能够满足GB/T-14285标准对继电保护装置整组动作时间的要求。

Optimal design of process level device delay based on self-adaption sampling algorithm and data processing

Compared with the traditional substation, the system has added the process layer equipment merging unit and the intelligent terminal, which causes the time of the protection equipment to move slowly. In this paper, a single interpolation sampling algorithm is proposed to combine the synchronous sampling algorithm with the interpolation algorithm. Based on synchronous state adaptive adjustment sampling algorithm, the processing delay of the internal sampling data is reduced. The CPU plug-in of the intelligent terminal is improved and the GOOSE multicast filtering and network is completed by FPGA. The function of the winding storm, CPU is responsible for the reception and transmission of GOOSE, and the MOSFET photoelectric coupling relay is used as the starting relay, and the exit time of the intelligent terminal is reduced by the optimization design. On this basis, a new process layer device is developed, and the dynamic model simulation and static model simulation are compared. The simulation test results show that the newly developed process layer device can reduce the 3 ms before optimizing the whole action time of the line protection device, and can meet the whole group action time of the GB/T-14285 standard for the relay protection device. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 52020116000L).