Dynamic Frequency Response Characteristics of Large Thermal Power Generation Units

When grid splitting occurs,dynamic frequency response characteristics of large thermal power generation units are of great concern to the maintenance of security and stability of system frequency.Taking the maximum frequency deviation and the time of its occurrence as research objectives,a dynamic model of frequency regulation for large thermal power generation unit in post-splitting power grid is established,and a method to determine the maximum frequency deviation and the time of its occurrence by solving the forth-order linear time-invariant non-homogeneous state equations is proposed.On this basis and utilizing measured parameters of a 600MW thermal power generation unit,the impacts of three important parameters,namely the primary frequency regulation limits,the speed droop and the forward coefficient,on dynamic process of frequency in post-splitting power grid are analyzed in depth.