Vulnerability Analysis Of Electrical Cyber Physical Systems Based On MATLAB Simulation

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.