Using wide bandgap (WBG) devices has been a promising solution to improve the efficiency of power inverters for photovoltaic (PV) applications. However, for multilevel inverters, using WBG devices to improve the inverter efficiency can increase the system cost dramatically due to the high price of WBG devices in the present market as well as the large number of power devices typically required in multilevel inverter topologies. In this paper, a five-level transistor clamped H-bridge (TCHB) inverter will be further investigated. This inverter requires much lower number of semiconductor switches and fewer isolated dc sources than the conventional cascaded H-bridge inverter. To improve the inverter efficiency, semiconductor switches operating at carrier frequency will be configured by Silicon Carbide (SiC) devices to reduce the dominant switching losses, while the switches operating at fundamental output frequency (i.e., grid frequency) will be constituted by Silicon (Si) devices. As a result, both of the peak efficiency and California Energy Commission (CEC) efficiency of the TCHB inverter are significantly improved and dramatic system cost increase is avoided. In addition, due to the faster saturation characteristic of the IGBT devices, the large short-circuit current in SiC MOSFETs is constrained under the condition of load short-circuit faults. In other words, this proposed 'SiC+Si' hybrid TCHB inverter can ride through a load short-circuit fault. Simulation and experimental results are presented to confirm the benefits of this proposed hybrid TCHB inverter.
|Title of host publication||2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018|
|Number of pages||7|
|State||Published - Dec 3 2018|
|Event||10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States|
Duration: Sep 23 2018 → Sep 27 2018
|Name||2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018|
|Conference||10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018|
|Period||9/23/18 → 9/27/18|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT The support of University of Kentucky, the L. Stanley Pigman endowment and the SPARK program, and ANSYS Inc. is gratefully acknowledged.
© 2018 IEEE.
- High efficiency
- Hybrid configuration
- Multilevel inverter
- Photovoltaic applications
- Silicon Carbide
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Renewable Energy, Sustainability and the Environment
- Control and Optimization
- Computer Networks and Communications
- Hardware and Architecture
- Information Systems and Management