Research On Voltage Safety And Stability Of Beijing Electric Network Based On BPA

With economic developing rapidly, power load increases fast, the connection of the electric network becomes more and more closely recent years,power is transmitted to each other among big electric power system, the research on voltage stability has practice signification for the safety and stability of electric network. In term of the trait of Beijing grid,this paper used BPA as analysis tool,combine with sensitivity analysis method , limited power analysis method ,bifurcation analysis method analyze the steady state voltage stability of Beijing grid . Simulate the model of the practice system operation based on Beijing grid and the trait of BPA. Get the margin from the operation status to voltage instability and the situation of reactive power by PV curve and VQ curve. Use bifurcation curve and analyze the effect on voltage stability by static load model,propose that critical voltage decrease with the constant impedance ratio increasing.