Abstract
The active power-frequency control of the traditional virtual synchronous generator (VSG) will produce out power error from the droop control due to the introduction of damping, so VSG would not meet the requirements of dynamic active power damping and the primary frequency modulation of the power grid at the same time. By analyzing the principles of VSG control, the virtual synchronous control strategy is applied to the modular multilevel converter (MMC), and the VSG control strategy is improved, and a high-pass filter is introduced into the damping loop, and the damping loop signal is set to zero when the system is stable, thus active power deviation due to introduced damping is eliminated. The optimal control strategy can dynamically adjust the damping coefficient to ensure the necessary damping of the power system and increase the effectiveness of the droop control. Finally, the feasibility and effectiveness of the improving strategy are verified by MATLAB/Simulink simulation.
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