Research On Fault Behavior Of Power Network Based On Colored Stochastic Petri Net

As the size of the power grid continues to expand,the de velopment of the power system is increasingly mature,and the difficulty of safe operation of the power grid is getting higher and higher,and people have put forward higher requirements for power supply reliability.In order to improve the safety and reliability of power system operation,it is necessary to study the fault behavior of the power grid.Cascading faults in the power grid are generally simple initial faults,which are affected by different factors during the propagation process,leading to serious consequences in the end.In this paper,a random stochastic Petri net(SCPN)is used as a tool to study the effects of hidden faults in relay protection and large-scale transfer of power flow.The dissertation summarizes the internal mechanism of cascading fault transmission from previous typical major power outages,and analyzes the main factors affecting the cascading fault transmission: large-scale power grid transfer,hidden faults of relay protection devices,and finally the judgment of cascading fault termination It was given a clear explanation.When using SCPN technology to study power grid cascading faults,first PN model each device of the power grid,and classify them to get the SCPN model of the device.Then,based on the power network topology,establish a systematic SCPN model and use it to study the power grid.Influencing factors of cascading failure.In this paper,a 3-machine 9-node system is taken as an example.Based on the DC power flow,the power flow transfer after a fault is considered in the system model.The hidden faults are statistical probability model,overcurrent hidden fault probability model,and distance protection recessive.The failure probability model is researched,taking the probability of cascading failures and the system’s possible loss load as indicators,and finally the simulation curve of the probability of cascading failures and the potential loss of the system versus the hidden failure probability is obtained through simulation fitting.Based on the risk theory,four indicators of load loss risk,power supply disconnection risk,power grid decommissioning risk,and system comprehensive risk are proposed.The risk assessment of cascading failures is carried out,and the vulnerable links in the system are identified so that operators can strengthen this link.monitor.The abo ve-mentioned research on the fault behavior of power grids is based on SCPN technology,which focuses on the two influencing factors of hidden faults and power flow shifts.It also assesses the risk of cascading faults and has a guiding role in the research of power grid faults.