Modeling Analysis Of Power System Cascading Failure Considering Typhoon And Communication Factors

The power industry is a basic industry supporting China's economic development.With the construction of smart grids,new uncertainties have also been added to the grid,threatening the safe and stable operation of the grid.In recent years,internal and external factors caused major power outages caused by cascading failure,which caused inconvenience to people's lives and huge economic losses.Therefore,this thesis builds a cascading failure prediction model under different scenarios based on the fault chain theory,and predicts a cascading failure path that is more in line with the actual grid,and provides a reference for decision makers.First,the causes and losses of major power outages worldwide since 2000 are summarized,and the research background and significance of this article are elaborated.The research status of typhoon and information network impact on power system and the cascading failure model of the cyber physical power system are summarized.Secondly,based on the accident chain theory,the power system cascading failure prediction model considering typhoon and communication failure is established respectively.Consider the time characteristics of the typhoon's influence on the lines and divide it into an appropriate time scale.Consider the influence of the typhoon in the prediction of the initial fault and the next fault branches,and predict the accident chains in combination with the operating state of the system.The risk element transfer model is established according to the characteristics of the interactive impact of the cyber physical power system's cascading failure.The risk element transfer functions of power line fault,communication fault,and cascading failure are established respectively.The initial failures include communication network and power network failure,and subsequent failures need to be predicted based on the operating status of the system.Finally,we get the cascading failure path transmitted across space.Through the above cascading failure prediction models,an accident chain more in line with reality can be obtained.Thirdly,the thesis proposes a coordinated control scheme for generator scheduling and load-shedding based on load flow tracking to control general overloaded lines in a multi-timescale cascading failure prediction model under typhoon conditions.In a short period of time,the load shedding amount can be corrected by increasing the output of the generator.The IEEE39 system has verified that the typhoon can change the direction of the cascading failure path,and adopting a coordinated control scheme during the cascading failure can reduce the economic loss caused by the cascading failure to a certain extent.It provides an economically feasible solution for the control of cascading failure.Finally,the community partition and the Prim algorithm partition are used to obtain the actual grid partition.Regional dispatch centers are set up for each area to form the backbone layer,which forms the information network with the access layer and core layer.The access layer node corresponds to the power node,and finally forms a part of the one-on-one power cyber physical system.Based on the established cyber physical power system's cascading failure prediction model,the corresponding cyber physical power system is established with the IEEE 39 system to predict the cascading failure path.Analyze the impact of communication factors in the development of cascading failure,and improve Information systems provide the theoretical basis.