The application discloses a
hybrid system network converter long-
time domain prediction control and non-disturbance switching method, and belongs to the technical field of power
system control. In view of the problems of poor dynamic performance of a
hybrid system of a
network construction / following network converter under high proportion of
new energy grid connection and easy
impact of
mode switching, the method is as follows: a long-
time domain model is constructed to predict current control, a traditional PI current inner ring is replaced, a dq coordinate system is discretized to model, double-step length prediction is compensated to
delay, a Lagrange extrapolation is used to update a
reference current, current tracking accuracy and
harmonic suppression capability are improved; a non-disturbance switching strategy is designed, an alpha-beta coordinate system and a current control ring are unified, a switching angle is locked and an initial value of an
integrator is synchronized, a reference
voltage is dynamically adjusted to guarantee variable continuity; the two strategies are integrated into a
hybrid framework, stable operation and smooth switching under strong / weak
power grid and transition working conditions are realized. The application reduces grid-connected current
total harmonic distortion rate to below 0.85%, has no
voltage and current
impact in switching, and has the advantages of enhancing power
system stability and flexibility.