Design and Realization of Feeder Terminal Unit Based on DSP

Distribution automation is an effective means to improve the reliability and energy quality of power supply. Feeder automation (FA) is one of the important contents in the distribution automation, and feeder terminal unit (FTU) is the key intelligent equipment and basic control unit of feeder automation. In recent years, with the rapid development of detection and embedded technology, higher request on reliability and accuracy of FTU is put forward. In this paper, based on the design schemes of lots of manufacturers, a FTU using DSP as the hardware core is designed. It uses AC sampling theory to measure electrical network´s voltage and current, uses AC sampling value to calculate virtual value of voltage and current, power, power factor and other electrical parameters, and has several wave record functions. The software is based on uC/OS-II, enhances the system´s modularization and expansibility.