【作者】 王华；

【导师】 彭楚武；

【作者基本信息】 湖南大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 继电保护装置对整个电力系统的稳定运行以及被保护的电气设备都是极端重要的设施。在组成电力系统的各部分中,输电线路是联结各发电机以输送电力的设备。它们在山区、田野、地下,穿行如织网,与其他电力设备相比,因遭受雷击等而发生故障的几率要高的多,它们的继电保护装置因此也更为重要。传统的线路保护装置硬件资源及功能过于简单,运算速度慢,短引线差动保护影响差动保护的动作特性和安全性,难以满足目前对保护装置的快速性和实时性的高要求。本文针对上述问题,结合实际科研项目,研究与开发了一个基于光纤通信和DSP芯片的输电线路微机保护装置。 本文首先论述了线路微机保护装置的发展情况以及存在的问题,结合目前电力光纤网络的现状,重点对目前国内电流差动保护通信方式的不足进行了分析研究,得出应用光纤通信技术到线路微机保护装置中具有重要意义的结论;其次,对线路保护原理的几个关键问题(包括电流差动保护的判据,三段式电流保护,重合闸原理,低周减载原理)进行了深入研究,为本文线路保护装置的具体设计和实现打下了理论基础;针对光纤差动保护中数据的传输和同步问题,对比探讨了目前各厂家的几种解决方案,在此基础上提出一种新型梯形算法,并对该算法引起的误差进行分析,提出补偿办法;最后,运用上述研究成果,成功的开发了一种基于光纤通信和DSP芯片的输电线路微机保护装置。完成了硬件电路的详细设计,保护及通信模块等软件的开发工作,该装置采用Motorola公司生产的DSP56F807芯片,完成差动主保护和低周减载、三相一次重合闸等功能,保护装置与其上级监控系统间通信采用LONWORKS总线,以利于系统数据传输的高可靠性、安全性和互操作性。 对本文研发的线路保护装置进行的动态模拟试验结果表明,该装置具有可靠性高、动作正确率高、测量精度高以及抗干扰能力强等特点,证明了本文所研发的成果的有效性和实用价值。更多还原

【Abstract】 The relay protector is an extremely important installation to the stability of the operation of the whole electric power system as well as the protected electric facilities. Among all the components of the system, the transmit electricity is used to connect all generators, thus transport the electric power. Transmit electricity distributes in mountainous areas, fields and also under earth, crisscrossing as an intricate net. Compared with other electric facilities, the transmit electricity is much more probable to go wrong because of being lightning stricken or some other accidents. Therefore, the relay protector is with more significance for it. The traditional circuit protector is rather simple in its hardware resources and functions, slow-speed in its operation, and the short lead wire differential protector would have a negative impact on the operating characteristic and security of the differential protector. Thus, it is rather difficult to meet the present high requirement on speediness and real-time to the protector. This paper, aiming at the above problems and integrating with practical scientific research subjects, worked over and developed a microcomputer line protection based on optical fiber communications and DSP chip.This paper firstly gives an account of the development and existing problems of the circuit computer protector, and integrating with present situation of power fiber network, made an emphasized analysis and research on the shortages of present current differential protect communication at home, and there out made a conclusion on the significance of the application of the optical fiber communications to microcomputer line protector; Secondly, the author had a deep study on several key problems to the circuit protect theory (including current relay, three segment current protect, three phase re-close with detecting no voltage, frequency relay), and laid theoretic foundations for material design and its realization on line protector. Then, aiming at the problem of data transmission and synchronization of fiber differential protector, and making a compared discuss to several present proposals of different factories, a new echelon arithmetic was advanced on the basis of it. Furthermore, the paper made an analysis on the errors caused by this echelon arithmetic and put forward remedies. In conclusion, the author successfully applied above research achievements to, based upon optical fiber communications and DSP chip, designing a microcomputer line protector, completing hardware detail designing, as well as protection and communication module developing, which adopts the DSP56F807 CMOS chip manufactured by Motorola Inc. to realize the functions of current relay, frequency relay, and three phase re-close with detecting no voltage, etc. The communications between protector and its superior monitoring system adopt LONWORKS bus, so as to ensure and promote the high reliability, security and mutual operation of the data transmission.The dynamic simulate testing result of the protector developed in this paper indicated this line protection device is with high reliability, exactness, measure precision, and processes high anti-jamming capacity. Meanwhile, the research achievements of this paper also proved to be high in validity and applying value.更多还原