Study On Voltage Stability Analysis And Control Strategy Of Beijing Power Grid

Beijing power grid,an important part and a load center of the North China Power Grid, is a typical receiving power system.Its secure and stable production affects directly security and stability of the entire North China Power Grid.Over 75%of power demands in Beijing during peak periods depends on incoming power from outside power grid.The high proportion of incoming power from outside is makin.g the voltage stability worse.In this paper,voltage stability problem of Beijing power grid is studied in normal and contingency conditions,the nodes and areas which may cause voltage instability are distinguished and the control strategy to prevent system voltage instability is present.By using the present algorithm and software,the reactive power sources in several operational conditions are analyzed in static and dynamic ways,to find out the fault set which make the network voltage instability and the weak nodes,pivotal branches and important generators. Further more,the control strategies against the problem are present,which can be used as a voltage stability criterion to make sure that the power network in Beijing is operated safely and economically.