A Capacity Assessment Method of Wind Farm Participating in Primary Frequency Modulation

Abstract

Wind farm participating in system frequency modulation generally ignores the influence of temporal and spatio distribution differences on wind turbine operating conditions. It is extremely unreasonable to use wind speed of the wind tower to measure wind farm frequency regulation capacity. In this paper, a capacity assessment method of wind farm participating in primary frequency modulation based on dynamic spatial-temporal distribution modeling of wind speed is proposed. Firstly, aiming at a variety of typical fan frequency control strategies, based on the advantages and disadvantages of various strategies, determine the optimal composite frequency modulation control strategy for fans at different wind speeds. Secondly, based on the study of the spatial and temporal distribution characteristics of wind speed in wind farms, a wind speed model considering the temporal and spatial characteristics of wind speed in wind farms is established. The maximum frequency modulation capacity of the entire wind farm is further determined by modeling the frequency modulation capacity of different wind speed intervals. Taking a wind farm in Hexi area of Gansu as an example, the simulation results show that the various frequency modulation strategies are complementary and can maximize the wind field frequency modulation capability of the full wind speed section. Finally, compared with the results of the direct method, the frequency modulation capacity of the wind farm can be more accurately reflected, and the effectiveness of the proposed evaluation method is verified.