【作者】 黄鹏；

【导师】 颜钢锋；

【作者基本信息】 浙江大学 ， 电气工程， 2019， 硕士

【摘要】 现代电网配备了先进的控制器与传感器,信息系统和电网系统的关系更加紧密,已经演变为电网物理信息系统。在电网运行过程中,一旦发生初始故障,继电保护设备将切除故障设备来维持电网的安全稳定运行。在这个过程中如果故障影响较大、切除的设备较多,可能会出现解列的情况。为了预防解列引发的电网事故,电网的脆弱性分析就显得极其重要。传统的分析方法没有考虑通信网络故障对电网的影响,没有考虑电网自身的继电保护功能与自我调整功能,更没有考虑这个过程中的经济成本。本文搭建了电网物理信息系统仿真平台并提出了相应的脆弱性评估指标,基于平台的仿真结果对脆弱性评估指标的合理性进行验证。本文所做的研究工作主要包括如下四个方面:(1)阐述了电网物理信息系统基本结构,搭建了电网物理信息系统仿真平台为后续电网脆弱性分析研究提供支撑。(2)对平台中涉及的拓扑查找选取算法与发电机出力调整算法进行了详细介绍。介绍了弗洛伊德最短距离算法,并基于此算法介绍电网新主区域的选取方法。针对不平衡情况下的发电机出力调整,分别介绍了基于平均策略、线路负载率和电气距离的发电机出力调整算法。(3)结合电气距离、度数与发电机净输出功率等因素提出了电网脆弱性分析的评估指标,基于该指标对IEEE标准39节点系统的支路进行脆弱性评估。(4)对仿真平台在不同故障情况下得到的最终结果进行分析,比较不同故障、不同发电机调整方法带来的影响。结合仿真结果验证所提出的脆弱性评估指标的合理性。更多还原

【Abstract】 Modern power grids are equipped with advanced controllers and sensors.The relationship between information system and power grid system has become closer,and has evolved into a cyber physical system.During the operation of the power system,once the initial fault occurs,the relay protection device will cut off the faulty equipment to maintain the safe and stable operation of the grid.In this process,if the fault has a large impact and there is much more equipment to be removed,the splitting may occur.In order to prevent accidents caused by splitting,the vulnerability analysis of the grid is extremely important.The traditional analysis method does not include the impact of communication network failure,the grid’s own relay protection function and the economic cost in this process.In this research an electrical cyber physical system simulation platform is built,and the corresponding vulnerability assessment index is proposed.The platform-based simulation results verify the rationality of the vulnerability assessment index.The research work done in this paper mainly includes the following four aspects:(1)The basic structure of the electrical cyber physical system is expounded,and simulation platform is built to provide support for the subsequent vulnerability analysis of the grid.(2)The topology search selection algorithm and generator output adjustment algorithm involved in the platform are introduced in detail.The Floyd shortest distance algorithm is introduced,and the selection method of the new main area of the grid is introduced based on this algorithm.In view of the generator output adjustment under unbalanced conditions,three generator output adjustment algorithms based on different critical quantities are introduced.(3)Based on the factors of electrical quantity,degree and net output of generator,the evaluation index of vulnerability analysis is proposed.Based on the index,the vulnerability of the IEEE standard 39-node system is evaluated.(4)The final results obtained by the simulation platform under different fault conditions are analyzed to compare the effects of different faults and different generator adjustment methods.The simulation results are used to verify the rationality of the proposed vulnerability assessment index.更多还原