PWM Method without Dead-Time-Error for a Voltage-Fed Three-Level Converter

Abstract

Voltage-fed converters have dead-time to protect the short-phenomenon of the DC-link voltage. However, this dead-time distorts the AC-output voltage and decreases the DC-link voltage utilization. To overcome these problems, the authors propose a PWM method without voltage error caused by the dead-time for a voltage-fed three-level converter. In this letter, the principle and theoretical operation of the proposed PWM method are described in detail and the theory is confirmed through experiments.