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在基于数字信号处理器(DSP)和高速AVR系列单片机的双CPU协调工作的同步相量测量单元(PMU)研究开发的基础上,进行了其通信方式的研究。PMU内部DSP与AVR单片机之间采用串行外围接口(SPI)实现高速可靠通信,以便AVR单片机完成瞬时数据和相量数据的记录、显示和通信,实现PMU独立运行;PMU与现场工控机之间采用通用串行总线(USB)接口传送瞬时数据和相量数据,实现局域分析和控制;以控制器局域网(CAN)总线和工业以太网技术相结合的通信方式把相量数据传送至测量中心实现全网分析和控制。
Based on the research and development of the synchronous phasor measurement unit (PMU) based on the double CPU coordination of digital signal processor (DSP) and high speed AVR series microcontrollers, the communication methods are studied. The serial peripheral interface (SPI) between the PMU and the AVR microcontroller realizes high-speed and reliable communication so that the AVR MCU can record, display and communicate instantaneous data and phasor data to realize the independent operation of the PMU. Between the PMU and the field IPC Transient data and phasor data are transmitted through a universal serial bus (USB) interface for local analysis and control. Phasor data is transmitted to a measurement center by way of a combination of a controller area network (CAN) bus and industrial Ethernet technology Realize the whole network analysis and control.