The application provides a T-type three-level
inverter output
voltage transient fast compensation method, and relates to the field of power electronic control, which collects three-phase output
voltage and current in real time, and obtains
voltage vector sequence in two-phase static coordinate
system through Clarke transformation. The real-
time average radius and offset vector of
voltage vector trajectory are calculated through sliding window, the
radius deviation rate and offset rate are calculated, and compensation is triggered when any index exceeds the preset threshold. According to the
distortion type, the required compensation deviation of each phase is calculated, the compensation priority is determined according to the compensation deviation absolute value, and the
single tube compensation is preferentially selected based on the compensation deviation polarity and the phase current direction. When the amplitude is insufficient or the current direction is not matched, the
double tube combination is started. The selected switch tube drive pulse is shielded, the switch function is reconstructed to execute compensation, and iteration
verification is carried out until the voltage trajectory is restored to be circular. The application is realized by pure
software, does not change the original control architecture and topology mode, guarantees the dynamic voltage transient to meet the standard, and does not deteriorate the
harmonic quality.