【作者】 朱耀麟；

【导师】 刘健；

【作者基本信息】 西安科技大学 ， 通信与信息系统， 2003， 硕士

【摘要】 分析了典型对等式远动规约DNP 3.0规约中数据传输的实时性、分层功能的透明性以及帧格式定义的科学性； 提出了一种远动信息有效分类方法和收集过程提高远动信息传输的实时性；总结了为保证遥控和遥调的可靠性在程序实现中应遵守的规则；分析了DNP规约时间同步中同步误差的产生原因，并给出了改进方法；提出一种实现远动技术中参数设置的可行方法。 根据DNP 3.0规约数据链路层类FT3帧及其校验方式，推导出帧传输失败概率(误帧率)与通道误比特率和帧长的关系，同时给出平均传输次数和重复传输次数的计算公式。在此基础上结合远动信息传输实时性的要求，分析了远动规约三种基本传输模式的实时性，并根据他们传输特点提出了设计考虑和优化方法；在问答式传输模式中，论述了在保证1类数据的实时性的情况下，主站询问子站的时间间隔的选取方法和选取范围；在循环式传输模式中，讨论了为兼顾信息传输的可靠性和有效性的情况下，子站采用重复3次传送重要信息的可行性和必要性，并确定了重复传送次数最优值的选取区间；在对等式传输模式中，指出了在具体的配置下传输速率与误比特率选取的约束关系。 设计了远动规约程序的外部接口和内部结构，并分析了程序总体设计中的三种可供选择的技术路线；讨论了程序功能有效分工的策略，提出了以透明性进行有效分工的方法；设计了主站应用层、传输层和数据链路层，并用VC++加以实现，成功地应用于工程实践中，收到良好效果，达到了预期目标。更多还原

【Abstract】 The typical peer to peer telecontrol protocol DNP 3.0 is analyzed on the real time performance of data transmission , the transparency of layered function and the scientificity of frame format definition.The valid classification method and the gathering procedure of telecontrol information are presented so as to improve real time performance of telecontrol information transmission. The rules to be obeyed in program realization are summed up in insuring the reliability of telecommand and teleadjusting. The reason of synchronized error of DNP time synchronization is analyzed, and the improved means is given. A feasible way to realize parameter setting of telecontrol technology is put forward.According to Similar FT3 frame format and its checkout mode of DNP Data Link Layer, the relationship between FER( Frame Error Rate)and BER(Bit Error Rate), frame length is deduced. The computation formulas of average transmission times and repeat transmission times guaranteeing the correct transmission of telecontrol information are given as well. On the basis of such formulas and the demand of the real time performance of information transmission, real time behavior of three basic transmission modes are analyzed. Design considerations and optimization of the three modes are proposed according to their transport characters. In polling mode, the way to determine the polling interval of a Master station to ensure the real time performance of Class 1 data is illustrated. In cyclic data transition mode, the feasibility and necessity of an Outstation keeping on transferring important information three times so as to obtain both reliability and validity of information transmission is discussed. The optimum times of transmission is also talked about. In peer to peer mode, the constraint between transmission rate and BER in the case of a certain configuration is detailed.The external interface and internal structure of telecontrol protocol program is designed, three optional route of total program design are analyzed. The tactic of effective dividing of the program function is discussed, the effective way to divide the program function is presented in term of transparency. Application , transport and data link layers of Master station is designed and realized with VC++. The developed program is successfully used in the projects of distribution automation.更多还原