配电网故障诊断的Petri网建模与仿真研究

发布时间：2018-09-01 09:27

【摘要】：随着科技的进步和社会的发展,各类行业对电力系统的依赖程度日渐增加,电网规模不断扩大。由于人为破坏或自然不可抗拒力等原因,电网故障引起大规模停电事故的概率亦有所增加,将造成供电质量的下降,甚至损坏电气设备等后果。显而易见,亟需一套比较完备的故障诊断系统,为电力人员分析决策提供可靠的技术支持,减少故障的蔓延,保证优质稳定的电能供应。首先,在现有的研究成果前提下,研究了基于时序颜色Petri网的故障诊断方法,并完善了模型,通过时序公式充分利用远后备保护信息,使其即使在主保护信息缺失的情况下仍可继续进行故障诊断。同时用软件MATLAB编程实现诊断过程以确定故障元件。然后,通过将与或树元素融入到颜色Petri网中,利用与或树突出的容错性及逻辑表达能力和颜色Petri网的折叠功能,形成二者优点结合的诊断模型,不仅诊断过程比较简单,具有较好的处理不完备信息的能力,而且具有规模较小、简易清晰的优势,可避免组合爆炸,通用性和适应性较好。最后,利用仿真软件MATLAB GUI对故障诊断进行了界面的设计与实现,并用算例进行验证。通过MATLAB GUI将系统的拓扑结构图与故障诊断功能集成到一起,既可以形象地展现出系统各元件的连接关系,又可以使用户清晰地看到故障信息和诊断结果,方便操作与分析、增强了人机互动。
[Abstract]:With the progress of science and technology and the development of society, the dependence of various industries on power system is increasing day by day, and the scale of power grid is expanding. As a result of artificial destruction or natural irresistible force, the probability of large-scale power outages caused by power grid failures has also increased, which will lead to the decline of power supply quality and even the damage of electrical equipment and other consequences. It is obvious that there is an urgent need for a complete fault diagnosis system to provide reliable technical support for the analysis and decision of power personnel, to reduce the spread of the fault and to ensure the high quality and stable power supply. First of all, based on the existing research results, the fault diagnosis method based on temporal color Petri nets is studied, and the model is improved, and the remote backup protection information is fully utilized by time series formula. The fault diagnosis can be continued even if the primary protection information is missing. At the same time, the software MATLAB is used to realize the diagnosis process to determine the fault components. Then, by integrating the and or tree elements into the color Petri net, using the fault tolerance and logic expression ability of the and or tree and the folding function of the color Petri net, the diagnostic model combining the advantages of the two is formed, and the diagnosis process is not only simple, but also simple. It has the ability to deal with incomplete information, and has the advantages of small scale, simple and clear, can avoid combination explosion, good versatility and adaptability. Finally, the interface of fault diagnosis is designed and implemented by using the simulation software MATLAB GUI, and an example is used to verify it. By integrating the topological structure diagram of the system with the function of fault diagnosis through MATLAB GUI, the connection relationship of each component of the system can be displayed vividly, and the user can see the fault information and diagnosis result clearly, which is convenient for operation and analysis. Enhanced man-machine interaction.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711

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