Single-phase space vector modulation method for five-level active neutral-point clamped H-bridge frequency converter

The invention discloses a single-phase space vector modulation method for a five-level active neutral-point clamped H-bridge frequency converter. The switching state of the frequency converter is screened according to the frequency converter common-mode voltage minimum principle and the switching state switching constraint to determine a basic voltage vector adopted in a vector interval where an expected output voltage vector is located; the action time of the basic voltage vector is calculated according to the volt-second balance principle; according to the action time of the basic voltage vector,the fed-back neutral point potential deviation and suspension capacitor voltage deviation, the action time of each switching state is calculated; a switching state sequence in a control period is determined according to the principle that the switching action frequency is minimum; and a pulse is generated according to the switching state sequence in the control period and the action time of each switching state and