Title:Cyclic Digital Transmission Communication Software Design and Realization
VOLUME: 9 ISSUE: 2
Author(s):Teng Gao, Ji-Yan Zou, Jin-Yan Song, Jin-Hua Ding, De-Quan Wang and Zhen-Yuan Si
Affiliation:School of Mechanical Engineering & Automation, Dalian Polytechnic University, Dalian, China.
Keywords:Cyclic digital transmission protocol, communication, serial port, smart grid, switchgear.
Abstract:The devices in the intelligent substation are required to transmit and
process information in Smart Grids. On account of the modular design technology,
serial port communication becomes the main technique used to connect intelligent
modules as its high reliability, flexibility, and ease-of-use features, which is also
used in the communication of the data collection board and the conversion board of
the three-phase circuit breaker. Cyclic Digital Transmission (CDT) protocol, which
is issued by the Ministry of Energy of China, is widely used in the communication
of the power system in China. The framework of CDT protocol is composed of the
function, the information word, the transfer rules and the frame structure. The CDT
protocol that adopts STM32 as the CPU is developed in this paper, so as to achieve
highly automated grid scheduling and reliable and stable communication. Some functions and
technologies of STM32 such as Timer, USART, DMA, etc., are described in detail. The test results
indicate that the serial port reliable communication based on CDT protocol can be realized, which also
shows that the data collection board can communicate with the dispatch center via the protocol
conversion board.
