Voltage regulation method for three-phase four-bridge-arm three-level inverter

Abstract

The present invention provides a voltage regulation method for a three-phase four-bridge-arm three-level inverter. The method includes: determining a voltage vector corresponding to a three-phase voltage; constructing a controllable spatial polyhedral region on the basis of an abc three-dimensional coordinate system and the voltage vector; positioning preset reference vectors in a plurality of sub-regions of the controllable spatial polyhedral region, so as to generate reference voltage vectors corresponding to the reference vectors, wherein the reference voltage vectors are used for controlling output states of corresponding four bridge arms; sorting the reference voltage vectors with a modulation strategy in which a zero-level output state is reduced; and generating a switching pulse sequence of the bridge arms according to the sorted reference voltage vectors and a corresponding action time, so as to regulate a midpoint voltage of the three-phase four-bridge-arm three-level inverter. In this way, the midpoint voltage of the inverter can be balanced.

Dependencies are inferred from the claim text.