Abstract
Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth bridge arm uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load.
Highlights
Z-source inverter[1,2,3,4,5] with Buck-Boost characteristic can boost the low DC power to a specified high voltage, and the two switches of the same bridge arm can conduct at the same time
The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load
The traditional three-phase inverter can not provide pathways for the zero sequence current which is generated by unbalanced load, It is only suitable for balanced load
Summary
Z-source inverter[1,2,3,4,5] with Buck-Boost characteristic can boost the low DC power to a specified high voltage, and the two switches of the same bridge arm can conduct at the same time. Three-phase four-bridge arm inverter[6,7] increases a bridge arm on the basis of the traditional three-bridge arm inverter structure. This bridge arm constitutes midline and eliminates the need of the midpoint transformer when the load is unbalanced, reduces the volume and weight of the system. The paper separates the fourth bridge arm from the other control coupled bridge arm. Based on the advantages of the Z-source network and three-phase four-bridge arm inverter, this paper presents Z source three-phase four- bridge arm inverter, and it can improve the voltage pressure, under the unbalanced load it is able to maintain a good symmetrical output voltage
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
