This paper presents a new concept for a power electronic converter - the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide-semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.
If the inline PDF is not rendering correctly, you can download the PDF file here.
Abu-Rub H. Malinowski M. and Al-Haddad H. (2014). Power Electronics for Renewable Energy Systems Transportation and Industrial Applications. Hoboken NJ: Wiley.
Anthon A. Zhang Z. Andersen M. Holmes G. McGrath B. and Teixeira C. A. (2016a). Comparative Evaluation of the Loss and Thermal Performance of Advanced Three-Level Inverter Topologies. IEEE Transactions on Industry Applications 53(2) pp. 1381-1389.
Anthon A. Zhang Z. Andersen M. Holmes G. McGrath B. and Teixeira C. A. (2016b). The Benefits of SiC mMosfets in a T-Type Inverter for Grid-Tie Applications. IEEE Transactions on Power Electronics 32(4) pp. 2808-2821.
Furusho Y. and Fuji K. (2016). 1-MW solar power conditioning system with boost converter using all-SiC power module. In: Proceedings of 9th International Conference on Integrated Power Electronics Systems CIPS 2016 Nuremberg Germany: VDE pp. 1-5.
Grbovic P. Delaure P. Le Moigne P. and Bartholomeus P. (2012). A Three-Terminal Ultracapacitor-Based Energy Storage and PFC Device for Regenerative Controlled Electric Drives. IEEE Transactions on Industrial Electronics 59(1) pp. 301-316.
Gu M. Xu P. Zhang L. and Sun K (2015). A SiCbased T-type three-phase three-level grid tied inverter. In: Proceedings of 10th Conference on Industrial Electronics and Applications (ICIEA) Auckland: IEEE pp. 1116-1121.
Gurpinar E. and Castelazzi A. (2015). Single-Phase T-Type Inverter Performance Benchmark Using Si IGBTs SiC MOSFETs and GaN HEMTs. IEEE Transactions on Power Electronics 31(10) pp. 7148-7160.
Rąbkowski J. Barlik R. Matulka J. and Nowak M. (2002). An extended structure of NPC three level converter as a universal power compensator. In: Proceedings of the EPE-PEMEC Conference Dubrovnik-Cavtat: PEMC pp. 1-8.
Rąbkowski J. Sak T. Strzelecki R. and Grabarek M. (2017). SiC-based T-type modules for multi-pulse inverter with coupled inductors. In: Proceedings of 11th IEEE International Conference on Compatibility Power Electronics and Power Engineering (CPE-POWERENG) Cadiz: IEEE pp. 568-572.
Schweizer M. and Kolar J. W. (2013). Design and Implementation of a Hybrid Efficient Three-Level T-Type Converter for Low-Voltage Applications. IEEE Transactions on Power Electronics 28(2) pp. 899-907.
Shi Y. Shi Y. Wang L. Xie R. and Li. H. (2016). A 50kW high power density paralleled-five-level PV converter based on SiC T-type MOSFET modules. In: Proceedings of Energy Conversion Congress and Exposition (ECCE) Milwaukee: IEEE pp. 1-8.
Shi Y. Xie R. Wang L. Shi Y. and Li. H. (2017). Switching Characterization and Short-Circuit Protection of 1200 V SiC MOSFET T-Type Module in PV Inverter Application. IEEE Transactions on Industrial Electronics 64(11) pp. 9135-9143.
Uemura H. Krismer F. and Kolar J. W. (2013). Comparative evaluation of T-type topologies comprising standard and reverse-blocking IGBTs. In: Proceedings of 39th IECON 2013 Conference 10-14 November 2013 Vienna: Austria Center Vienna pp. 1288-1295.