一种基于FPGA技术的电子式互感器接口实现新方法

电子式互感器的应用对提高电力系统尤其是继电保护的可靠性具有重要的创新意义，与保护、测量装置的接口是需要重点研究及解决的问题。文中介绍了连接电子式互感器与保护、测量设备的合并单元及其功能模型，分析了合并单元与电子式互感器接口通信具有多任务并行处理等特点，提出一种基于现场可编程门阵列(FPGA)技术实现此接口的新方法。利用FPGA可完成合并单元对多路电子式互感器数字化输出进行接收和循环冗余校验的并行处理功能，通过调用FPGA的先进先出(FIF0)库能实现发送报文前对各路数据的正确排序。这种方法对于推动电子式互感器在厂站自动化中的应用，具有工程实用价值。

A NEW FPGA-BASED METHOD FOR REALIZING THE INTERFACE TO ELECTRONIC TRANSDUCER

The application of electronic current/voltage transducers is of great significance in improving the reliability of power system and especially protection relays. However, the interface between the electronic transducer and bay device is the focus of the successful application. The merging unit, the key element of the interface, is introduced and its function model is also discussed. Considering the communication characteristic of the interface, i.e. the multi-task has to be dealt with in parallel, a new FPGA-based method for realizing the interface to electronic transducers is also proposed. By using FPGA, the merging unit can receive the sampled values from several electronic transducers and check the corresponding validity by means of cyclic redundancy code (CRC) checker simultaneously. Moreover, these sampled values can be ordered correctly via FPGA FIFO before they are transmitted. The suggested method has practical values for promoting the application of electronic transducer into the automation system of power plants and substations.