The Research Of Control Strategy Of Virtual Synchronous Generator Based On Hamiltonian Theory

As more and more countries realizing the advantages of renewable energy,a large number of renewable energy are applied to transmission and distributed power grids.However,most of renewable resources require power electronic equipments to complete the rectification and inverter.The high response speed of power electronic equipments may lead to the lack of inertia and damping,which have great impacts on the stability of the power grid.So with the continuing expand of the renewable energy penetration,improving the inertia and damping has a very important research significance.Virtual Synchronous Generator technology is designed to control power electronic devices to make the system’s output present the characteristics of the synchronous generator.In this paper,a new VSG control algorithm based on Hamiltonian system is proposed with the consideration of excitation and opening degree of the valve;Utilizing the Parker transform,there exists couplings of the current and voltage and adopts the Auto Disturbance Rejection Control to eliminate the coupling effects;Finally,the limit of energy storage equipments is taken into account and an improved energy control module is designed to ensure the output of storage system within the limitation by adjusting the parameters of the VSG control system.This paper used DIgSILENT/PowerFactory to verify that the proposed algorithm can effectively improve the robustness and stability of the system and can adjust the inertia and damping to ensure that the energy storage’s output doesn’t beyond the limits.The proposed VSG control algorithm in this paper can improve the system stability and suppress the perturbation of the parameters.Considering the capacity limitation of the energy storage system makes the VSG control algorithm has certain theoretical and practical value.