Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 7, Pages 6320-6331Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2874036
Keywords
Space vector pulsewidth modulation (SVPWM); three-phase voltage source inverter (VSI); variable switching frequency control; zero voltage switching (ZVS)
Categories
Funding
- National Natural Science Foundation of China [51577012]
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources [LATS17019]
- Key Laboratory of Solar Thermal Energy and Photovoltaic System of the Chinese Academy of Sciences
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In this paper, a variable switching frequency space vector pulsewidth modulation control is proposed. It is used to achieve zero voltage switching (ZVS) for a three-phase grid-connected voltage source inverter with unity power factor. A wide range of ZVS can be realized without any additional sensors, auxiliary circuits, or current zero crossing detection circuits. The switching frequency can be easily calculated by a digital controller. The frequency variation range in a line cycle is only about 1.5 times at any specific load. An LCL filter is used to attenuate the high current ripples at the inverter side, and active damping is adopted to avoid the resonance and reduce the filter power loss. The switching loss can be significantly reduced by using silicon carbide MOSFETs so that the conversion efficiency is high. The power density can also he improved due to the high switching frequency and the low inductance value of the filter. The operating principle, design considerations, and loss analyses are discussed in detail. A 3.5-kW simulation and experimental prototype interfacing a 350-400-V dc with a three-phase 110-V ac grid is developed to verify the performance of the proposed control strategy.
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