电力系统故障诊断研究（本科）毕业设计论文.doc

摘 要 随着经济的快速发展，优质、可靠、稳定的电力供应己成为电能用户的普遍需求。然而由于自然、人为等多种因素的影响，电力系统的故障是不可避免的。特别是电力网络，由于输配电线路长期暴露在自然环境中，更是容易引发各种各样的故障，一旦电网发生故障，将会造成对用户供电的中断或供电质量的下降，甚至损坏电气设备。另一方面，在电网的规模和复杂程度不断增加的同时，自动化水平也在不断加强，越来越多的自动装置应用到电力系统中，当电网发生故障时，各级自动装置会产生大量的报警信息。这些信息不加选择地涌入控制中心，特别是同时出现多种故障信息并伴随有保护和断路器的拒动以及误动时，故障诊断问题将会变得异常复杂。 本文通过对电力系统故障诊断的一些研究，主要完成了下面一些研究及分析的工作：首先是了解了电力系统故障诊断的原理及各种类型，并说明了部分解决方法；然后简要的阐述了各种方法的原理，特别是遗传算法。最后，研究基于遗传算法的故障诊断，通过保护与断路器规则建模解析并求得最优解，又通过实际案例来证明了其有效性与准确性。 关键词：电力系统，故障诊断，遗传算法，目标函数，解析模型。 Abstract With the rapidly development of economy, high quality, reliable, stable power resource supply is needed widely. The power system faults are inevitable because of the influence of natural or artificial reasons. Particularly, the faults occur easily in power network as the electricity transmission and distribution lines are exposed in the natural environment. The faults will cause interruption of power supply or the quality descend, and even lead the equipment to be destroyed. On the other hand, the scale and complexity of power system are increasing, the level of automation is improving together with more and more automatic devices put into application. When the fault occurs, the automatic devices of the power system would produce a mass of alarm information and bring much difficulty to the operators for fault diagnosis, especially when the circuit breakers and relay protections have unwanted operation or fail to operate, the fault diagnosis becomes extraordinarily complex. This article based on the power system fault diagnosis some research, mainly to complete the research and analysis of some of the following tasks: First, to understand the power system fault diagnosis principle and types, and describes some of the solutions; then briefly describes each the principle method, in particular genetic algorithms. Finally, the study of fault diagnosis based on genetic algorithm, through the protection and circuit breaker rules modeling analysis and optimal solutions, but also through the