Frequency adaptive control method for inverter based on model predictive virtual synchronous generator

A model predictive virtual synchronous generator inverter control system considering a frequency-movement direction, comprising

• a frequency-movement state determination module configured to obtain a current frequency absolute value based on fundamental frequency of an inverter and a steadystate absolute value based on the fundamental frequency of the inverter;
• determine a frequency-movement state by comparing the above two absolute values:
• in a state of deviating from the fundamental frequency or a state of regressing to the fundamental frequency;
• a frequency-adjustment module configured to set a corresponding prediction output horizon according to the frequency-movement state, and construct a cost function considering the frequency-movement state;
• and
• calculate an optimal virtual power increment value based on the cost function, then calculate an optimal virtual power, input the optimal virtual power to a swing equation of a virtual synchronous generator, and perform frequency adjustment according to an output value based on the swing equation.