Abstract
With the increasing proportion of renewable energy and power electronic equipment, the characteristics of traditional power system have changed greatly. Virtual synchronous generator (VSG) is a control strategy that simulates the rotor motion and provides voltage and frequency support for power system. Although virtual synchronous generator can solve the low inertia and weak damping problem caused by high permeability of renewable energy, the influence of harmonic dynamic characteristics on VSG can not be ignored. In order to study the harmonic dynamic characteristics of virtual synchronous generator, it is necessary to establish a model to describe the multi-frequency dynamic characteristics. Based on the theory of harmonic state space (HSS), a small signal model of virtual synchronous generator is established in dq frame. Finally, the HSS model calculation results and MATLAB/Simulink simulation results are provided to validate the proposed model.
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