Abstract
When a single Virtual Synchronous Generator (VSG) is connected to the grid, the output voltage amplitude and frequency are significantly different from the grid voltage, which will impact the power grid. In order to solve this problem, the paper proposes a grid-connected pre-synchronization control method. By controlling the virtual synchronous generator based on the Phase Locked Loop (PLL) pre-synchronization unit, the voltage amplitude, frequency and phase of the VSG output before the grid connection can be consistent with the grid side, reducing the instantaneous impact of the grid. At the same time of the current, the output voltage of the virtual synchronous generator is stabilized. The single-machine VSG grid-connected model was built on the MATLAB/Simulink simulation platform and the effectiveness of the method was verified.
Published Version
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