Analysis and Assessment of Frequency Regulation Characteristics of Joint Wind-Storage System Based on Predicted Wind Speed and Load

With the aggravation of environmental pollution, the wind power gradually replaces traditional thermal power, which makes the electric system develop towards the new electric system with renewable energy sources operating as the essential body. However, under high penetration of wind power, the stability of the system cannot be guaranteed, and the fluctuation of wind speed and load, as well as the weak inertia of the wind turbines, bring great challenges to the frequency of the grid. Therefore, this paper uses the Double Fed Induction Generator (DFIG) and battery energy storage (BES) to support the frequency, and puts forward the frequency regulation strategy of the combined wind-storage system with different wind speeds. At the same time, considering the uncertainty of wind speed and load, Monte Carlo and k-means clustering reduction scenarios are used to predict wind speed and load for a period of time, and the comprehensive index system is established to evaluate the frequency regulation ability of the combined wind-storage system when wind speed and load fluctuations occur. Finally, simulink was used to build the joint wind-storage system model and an example of frequency regulation control strategy. The simulation and assessment were carried out when three kinds of disturbances occurred, respectively, to verify the feasibility and effectiveness of the combined wind-storage frequency regulation scheme, so as to better adapt to the challenges of wind speed fluctuations and load changes.