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Influence Mechanism Analysis of Wind Power Integration on Ultra-low Frequency Oscillation Based on Comprehensive Inertial Control

For the purpose of improving the stability of the primary frequency modulation of power systems with renewable energy integration, wind power should provide frequency support service to participate in primary frequency modulation. However, the detailed of influence of wind power on grid frequency stability is not clear. As a result, this paper is motivated to investigate the influence mechanism of wind power on ULFO (Ultra-low Frequency Oscillation) based on comprehensive inertial control. Firstly, the renewable energy wind power system, which adopts the comprehensive inertial control strategy, is divided into five major components according to the electrical characteristics. And the small-signal model method is used to establish a linear model of wind power when participating in the power system response. Furthermore, a linearized model of primary frequency modulation response for power generation systems with three forms of energy is established by combining thermal power and hydropower systems, and setting corresponding state variables. Finally, it is simulated and analyzed in MATLAB/Simulink to infer the impact of wind power parameters on frequency modulation performance of power systems, and basic conclusions are drawn through the root locus characteristics of the above model.