Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 3, Pages 3085-3098Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3114322
Keywords
Inverters; Silicon carbide; Topology; Switches; Power harmonic filters; Harmonic analysis; Hybrid power systems; Hybrid silicon carbide (SiC)-silicon (Si) dc-ac converter; multi-quasi-proportional-resonance (QPR) control; partial power conversion; selective harmonic elimination pulsewidth modulation (SHEPWM); Si-IGBT master unit (MU); SiC-MOSFET slave unit (SU)
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Funding
- National Natural Science Foundation of China [51877035]
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Based on the concept of partial power conversion, this article proposes a hybrid silicon carbide-silicon DC-AC topology to improve performance in high power applications. By connecting SiC-MOSFET in series with a silicon IGBT working at low frequency, and using hybrid modulation strategy and quasi-proportional-resonance control, the performance of the proposed topology is verified through simulation and experimentation.
Based on partial power conversion concept, this article proposes a hybrid silicon carbide (SiC)-silicon (Si) dc-ac topology to improve performance in high power application. First, master unit (MU) uses Si-IGBT working in low frequency to handle main high power because of its high rated current capacity and high switching loss, whereas the low power quality of MU is induced by the low switching frequency. And SiC-MOSFET suffers from high cost and high conduction loss at high power level. To solve these problems, the partial-power slave unit (SU) based on SiC-MOSFET is connected with MU in series through line-frequency transformer, whereas SU works in high frequency to compensate the harmonic of MU and adjusts the total output voltage. In this new topology, the corresponding hybrid modulation strategy and multiple quasi-proportional-resonance control for single-phase system are introduced in detail to ensure the reliable operation. In the end, a 4.5-kW converter prototype was implemented and tested. Simulation and experiment results are given to verify the performance of the proposed hybrid dc-ac topology.
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