【作者】 郭彬；

【导师】 肖昌炎；

【作者基本信息】 湖南大学 ， 控制科学与工程， 2010， 硕士

【摘要】 现代电力系统覆盖范围广，各种系统和自动化装置如调度自动化系统、微机继电保护装置、事件顺序记录装置、远动装置、计算机数据交换网等都要求严格的时间同步。目前应用于我国电网中的时间同步技术主要是基于美国全球定位系统(GPS)的卫星授时，对于电力系统这样关系到国计民生的分布式网络采用GPS作为授时基准是存在安全隐患的。从电网的安全性、稳定性出发，本文根据电力系统时间同步技术规范，对基于北斗/GPS双模授时的电力系统时间同步技术进行了研究。本文首先阐述了卫星双模授时技术的原理，并对北斗和GPS系统的授时精度进行了测试。通过分析测试数据，验证了北斗和GPS系统的时钟用作电力系统和自动化装置时间同步源的可行性。接着，本文利用北斗接收机、GPS接收机和外部IRIG-B码作为系统的外同步信号，互为热备用。采用多同步源自适应同步技术，保证了北斗/GPS双模同步系统的可靠性和稳定性。然后，本文采用了基于数字移相技术的时间间隔测量方法和PI控制算法，完成了本地晶振的频率校准。通过对IRIG-B码编码方式的研究，完成了IRIG-B码的解码与编码。采用模块化设计，实现了可满足IEEE STD 1344-1995标准的IRIG-B (DC)码、时间报文(RS-232)、SNTP网络授时、光纤和告警等多种信息的输出接口。研制的北斗/GPS双模同步系统已经通过“国家电网公司自动化设备电磁兼容实验室”和“电力工业电力系统自动化设备质量检验测试中心”的检验，表明系统的时间同步精度优于±0.1μs，守时精度优于1μs/min,符合电网时间同步系统技术要求，具有一定的实用价值和推广应用价值。更多还原

【Abstract】 With comprehensive application of modern electrical power system, a strict clock synchronization is required various systems and automation devices, such as dispatching automation systems, microcomputer relay protection devices, sequence of events recording devices, remote devices, computer data exchanging network. Currently, the time synchronization technology used in electrical power system of China is mainly based on the satellite timing of the American Global Positioning System (GPS). The electrical power system using GPS timing reference, which a distributed network relates to people’s livelihood, is a potential safety hazard. Considering the security and stability of the electrical power system, we studies the electrical power system clock synchronization technology which is based on the Bei-dou and GPS dual-mode timing, accord with the electrical Power systems time synchronization of the technical specification in the paper.At first, the principle of the satellite dual-mode timing service technology is explained, and the precision of time service of Bei-dou and GPS system has been tested. By analyzing the test data, we verify the feasibility that the clock of GPS and Bei-dou system is used as time synchronization source of the electrical power system and automation devices. Then, Bei-dou receiver, GPS receiver and external IRIG-B code use as the external sync signal, hot spare of each other. The adaptation technologies of Multi-Sync Source is adopt the system, to ensure the reliability and stability of Bei-dou and GPS dual-mode synchronous system. The system adopts a measurement method of the time interval based on digital phase-shifting technique and PI control algorithm for adjustment, completing the frequency calibration of local oscillator. By a study of the IRIG-B code encoding, the system implements the IRIG-B code decoding and encoding. With the modular design, it realizes the IRIG-B (DC) Code, the time packet information (RS-232), SNTP network time service, fiber and alarm information and other output interfaces, to satisfy the IEEE STD 1344-1995 standard.Bei-dou and GPS dual-mode synchronization system has been tested by the "Automation Equipment EMC Lab. of State Grid Co." and "The Quality Inspection & Test Center of Power Industry for Automation Equipment". The time synchronization accuracy of the system is improved up to±0.1μs and punctual accuracy is better than 1μs/min. The device satisfies the technical requirements for electrical power system time synchronization, which has practical application value.更多还原