配电系统发展状况评估及故障诊断研究

发布时间：2018-04-20 04:23

本文选题：配电系统 + 故障诊断　；参考：《浙江大学》2017年硕士论文

【摘要】：配电系统作为社会发展和国民经济的重要基础,其发展和改造受到广泛地关注。随着能源危机和环境问题的加剧,近年来配电系统逐渐趋向智能化、信息化、多源化,其发展也面临着新的挑战和机遇。一方面,考虑到当前配电系统发展存在区域不均衡的问题,综合评估配电系统的发展状况,并以此建设和改造配电系统,是确保配电网安全稳定运行的一个重要环节。而另一方面,考虑到分布式发电技术和通信技术对配电系统的影响,发展新的故障诊断方法,辅助调度人员快速处理配电系统故障,是确保系统安全稳定运行的另一个重要环节。在上述背景下,本文对相关课题进行了初步的探讨和研究,主要完成了一下几个方面的工作:(1)概述了配电系统综合评估与故障诊断的国内外研究现状。首先,对现有的配电系统评估的指标体系和综合评估方法进行了梳理和介绍;之后,对现有的故障诊断方法进行了系统地分类分析,提出了现存配电系统故障诊断方法的问题和不足;最后,结合电力通信系统和电力系统两者的关系,比较现有电力通信网故障诊断方法的方法特点。(2)针对配电系统区域发展不均衡的问题,提出了一种综合评估配电系统发展与投资状况的新方法。首先,建立了面向对象的配电系统投资与发展状况评估指标体系;然后,采用组合权重法和自适应变权重机制确定指标体系的权重;其中,组合权重法将指标权重分解为排序权重和分类权重,以分别反映评估指标的不同属性和不同评估对象之间指标样本值的整体差异对评估结果的影响程度。之后,采用自适应变权重机制对存在指标值严重偏离正常范围的评估对象进行权重修正。最后,采用某省5个县域配电系统为例进行测试,并借助雷达图寻找建设的薄弱环节。(3)考虑配电系统发展受分布式电源的影响,提出了一种多代理框架下主动配电系统的故障诊断方法,包括多代理系统的基础架构设计、通用代理模型构建以及基于多代理系统的故障诊断策略制定。在所提出的多代理系统框架下,在各个母线/节点配置了以故障诊断解析模型为基础的母线代理,并引入关联因子来反映各代理间的耦合关系,对信息缺失和信息畸变对故障诊断正确性的影响区别分析,在此基础上重点研究了利用代理间通信和协商机制实现故障诊断的策略。最后,以32节点测试系统为例,表明了所提方法可以在相当程度上容纳警报信息缺失和畸变,并能够对保护和断路器的动作特性进行评价。(4)考虑配电系统发展趋于信息化的特征,发展了一种基于解析模型的智能变电站电力通信网故障诊断方法。首先,以现有的通信网络间信息的流通模型为基础,完善了报文链路的传输路径搜索算法;其次,构造计及虚实回路的故障假说,并利用报文信息的差异度建立故障诊断解析模型;之后,采用优化算法求解所构建的解析模型,获得最有可能的故障节点或者故障节点集;最后,以一个典型11OkV变电站的过程层网络为例,该模型能够在简单单一故障和复杂双重故障场景下均能得到有效、准确的诊断结果。最后对本章论中的初步研究进行了总结,并指出了该领域有待进一步深入研究的方向。
[Abstract]:As the important foundation of social development and national economy, distribution system is widely concerned with its development and transformation. With the energy crisis and the aggravation of environmental problems, the distribution system gradually tends to be intelligent, informational and multi-source in recent years, and its development is also facing new challenges and opportunities. On the one hand, the development of distribution system is taken into account. The problem of regional imbalance, the comprehensive evaluation of the development of distribution system and the construction and transformation of the distribution system is an important link to ensure the safe and stable operation of the distribution network. On the other hand, considering the influence of the distributed generation technology and communication technology on the distribution system, the new fault diagnosis method is developed to assist the dispatcher quickly. The failure of the power distribution system is another important link to ensure the safe and stable operation of the system. Under the above background, this paper has carried out a preliminary discussion and Research on the related topics, and mainly completed a few aspects of the work: (1) the current research status of the comprehensive evaluation and fault diagnosis of the distribution system is summarized. The index system and the comprehensive evaluation method of the distribution system evaluation are combed and introduced. After that, the existing fault diagnosis methods are systematically classified and analyzed, and the problems and shortcomings of the existing fault diagnosis methods are put forward. Finally, the existing power communication system and the power system are combined to compare the existing power communication. The method features of network fault diagnosis method. (2) in view of the unbalanced regional development of distribution system, a new method to comprehensively evaluate the development and investment status of distribution system is proposed. First, the target oriented distribution system investment and development evaluation index system is established. Then, combined weight method and adaptive variable weight machine are adopted. In order to determine the weight of the index system, the combination weight method decomposes the weight of the index into the ranking weight and the classification weight to reflect the impact of the different attributes of the evaluation index and the overall difference of the sample value of the indexes between the different evaluation objects. Finally, 5 County distribution systems in a province are used as an example to test and find the weak link of construction with the aid of radar chart. (3) considering the influence of distributed power supply system development, a fault diagnosis method of active distribution system under multi agent framework, including multi agent, is proposed. The basic architecture of the system, the general agent model construction and the fault diagnosis strategy based on the multi agent system. Under the framework of the proposed multi agent system, the bus agent based on the fault diagnosis analytical model is configured on each bus / node, and the associated factors are introduced to reflect the coupling relationship among the agents. The difference analysis of the effect of missing and information distortion on the correctness of fault diagnosis is analyzed. On this basis, the strategy of realizing fault diagnosis using inter agency communication and negotiation mechanism is emphatically studied. Finally, the 32 node test system is taken as an example to show that the proposed method can accommodate the missing and distortion of alarm information to a considerable extent, and can protect and protect the fault. The action characteristics of the circuit breaker are evaluated. (4) considering the characteristics of the development of the distribution system, an analytical model based fault diagnosis method for the intelligent substation power communication network is developed. Firstly, the transmission path search algorithm of the message link is perfected on the basis of the existing communication model of the communication network. Secondly, the structure of the transmission path search algorithm is improved. The fault hypothesis of the virtual loop is built and the fault diagnosis model is established by the difference degree of message information. After that, the optimal algorithm is used to obtain the most likely fault node or the fault node set. Finally, the model can be used as an example of the process layer network of a typical 11OkV transformer station. In the case of single fault and complex double fault, the effective and accurate diagnosis results can be obtained. Finally, the preliminary study in this chapter is summarized, and the direction of further research in this field is pointed out.

【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM72

【相似文献】