Study on Frequency Probability Distribution Characteristics of Power System with Wind Power

The large amount of new energy makes the frequency fluctuation characteristics of the power system more complex. The traditional analysis method takes a long time, which makes the optimization analysis of power system frequency control not flexible enough. To solve these problems, this paper establishes the primary frequency regulation model of the wind power system, obtains the FPK equation about the frequency probability distribution density function of the system, and uses a double grid numerical algorithm. By relaxing in the fine grid region and modifying in the coarse grid region, combining the advantages of the finite element method and the finite difference method, the probability distribution function of the system frequency is obtained, which is effective. This method is compared with the traditional Monte Carlo simulation method and finite element method. Through this method, the influence of the proportion of wind power output and various frequency regulation parameters on the frequency probability distribution is analyzed. The simulation example also verifies the rationality of the analysis and the accuracy of the algorithm.