To further address the voltage fluctuations and limit violations caused by the grid-connection of high-penetration photovoltaic (PV) plants
a fast reactive voltage control method for photovoltaic virtual synchronous generators (VSG) based on model predictive control (MPC) is proposed. Firstly
a dynamic model of VSG-based reactive power-voltage control is established based on its reactive power-voltage characteristics. Then
a discrete reactive power-voltage state-space incremental equation is formulated using the MPC framework. This model predicts the required reactive power capacity sequence by considering the future grid voltage error over a prediction horizon
and continuously updates and tracks the optimal solution through rolling optimization and feedback correction to minimize the deviation between the future grid voltage output and the reference trajectory
and the fast reactive power-voltage control for the PV VSG system is achieved. Besides
the closed-loop system stability of this model is analyzed. Suitable weighting coefficients are determined by calculating the system eigenvalues to ensure convergence. Finally
a simulation model of a PV plant interconnected into a two-area transmission network is established to verify the correctness and effectiveness of the proposed control method.
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