학술논문
High-Frequency Pulsating DC-Link Three-Phase Multilevel NPC Inverter Without Electrolytic Capacitor
Document Type
Conference
Author
Source
2018 IEEE Energy Conversion Congress and Exposition (ECCE) Energy Conversion Congress and Exposition (ECCE), 2018 IEEE. :1348-1355 Sep, 2018
Subject
Language
ISSN
2329-3748
Abstract
In this work it is proposed a multilevel NPC configuration for a high-frequency pulsating DC-link inverter for three-phase applications. The configuration consists of two DC/DC-pulsating converters cascaded with a DC-link capacitorless three-phase three-level NPC inverter. Due to the absence of DC-link electrolytic capacitors, the proposed inverter guarantees a long lifetime and high power density. The DC/DC-pulsating converters aim to generate the high-frequency pulsating DC-link waveform profiles which have to be synchronized with the three-phase inverter PWM. Comparing to the conventional PWM, the three-phase multilevel NPC inverter presents reduced switching losses due to the fact only one leg commutes during a switching period while the other two legs keep clamped in high or low impedance. Details of control strategy and modulation are explained. Experimental results for a 2kW setup are presented to validate the theoretical approach.