Space vector PWM control algorithm of five-phase three-level inverter is studied.

As for the five-phase three-level H-bridge inverter,the number of its output voltage vectors is so large that it\'s hard to apply the traditional SVPWM algorithm method into use.

In order to improve the cost performance of the five-level inverter,a novel five-level inverter topology was presented.

First of all, after the analysis of theses five-level inverter types and the advantages and disadvantages, the diode-clamped five-level inverter is carried out for an in-depth analysis.

Research on three-level inverter based on asynchronous motor vector control;

Space vector pulse width modulation method for three-level inverter;

A novel method of DC-voltage balancing control for three-level inverter;

This thesis first introduces the operating principle of three-level inverters briefly,then it gives the modulating calculation of SVPWM,and finally it makes an analysis of the influence on(voltage) space vector exerted by the unbalance of neutral potential and advocates the(improvement) of SVPWM calculation,during which the compensation control of voltage vector is implemented.

In order to study three-level inverters using in high voltage,high power motors drive applications,the switch model and topological structure were analyzed in detail,the mathematic model of the asynchronous motor was presented,then a method that SVPWM control convert bridge was proposed.

Recently, three-level inverters have been becoming increasingly popular in medium-high voltage ac drive systems and FACTS equipments, mainly because of their high voltage-capability, high output quality, low switching losses and low EMC concerns.