Characteristic Analysis of Primary Frequency Modulation in Power System Under Different Types of Active Disturbance

With the large scale accessing of wind power to the grid, the power system will withstand different types of active disturbances. In other words, in addition to the traditional step change of the active power caused by the generator outages or sudden change of load, the random fluctuation of the wind power will also cause a distinct deviation of the system frequency. Since different types of disturbances will cause different frequency response characteristics, it inevitably puts forward higher requirements for the optimal configuration of the primary frequency modulation capacity and governor parameters to synchronous generators in the system. For this reason, based on the electromechanical dynamic model which equivalent to the single machine, this paper analyzes the different characteristics of the primary frequency modulation under the step type likes generator outages or sudden change of load and the sinusoidal form likes wind power fluctuation. At the same time, the simulation results of the IEEE 3-machine 9-bus system based on the DIgSILENT further show that the governor aimed at single type active disturbance can not better adapt to other types. This paper will lay the foundation for the primary frequency optimizing configuration of the power system which considering multiple types of active disturbances.