Dead zone compensation method used in voltage space vector pulse width modulation technology

The invention relates to a dead zone compensation method used in voltage space vector pulse width modulation technology, belonging to the technical field of power electronics. The dead zone compensation method comprises the following steps of: firstly, acquiring three phases of output current IA, IB and IC of an inverter by a phase current sampling circuit, and judging polarities of the current; secondly, deducing a voltage space vector of a Td dead zone time length in a carrier period according to the polarities of the current three phases of current, wherein the voltage space vector is caused by a dead zone effect and is extra compared with that of an ideal condition; thirdly, obtaining a relationship between two effective voltage space vectors and the extra voltage space vector in the current voltage sector according to relationships of positions and sizes of six effective voltage space vectors in a 360-degree interval; and fourthly, correcting PWM (Pulse Width Modulation) pulse width output by SVPWM (Space Vector Pulse Width Modulation) according to the relationships. The method is used for correcting partial PWM pulse width in each carrier period without excessive calculations, is simple and feasible, and easy to realize, thus operation time of a CPU is greatly reduced.