دانلود رایگان مقاله A Variable Switching Frequency Space Vector Modulation Technique for Zero Voltage Switching in Two Parallel Interleaved Three-Phase Inverters

دانلود رایگان مقاله A Variable Switching Frequency Space Vector Modulation Technique for Zero Voltage Switching in Two Parallel Interleaved Three-Phase Inverters

IEEE Transactions on Power Electronics, Volume: 34, 2019

A Variable Switching Frequency Space Vector Modulation Technique for Zero Voltage Switching in Two Parallel Interleaved Three-Phase Inverters

Abstract

A variable switching frequency space vector modulation control method is proposed in this paper. It is used to achieve zero voltage switching (ZVS) for two parallel 180° interleaved three-phase grid-connected voltage source inverters (VSI) at unity power factor. A wide range of ZVS can be achieved without any additional sensor, auxiliary circuit, or current zero crossing detection circuit. The carrier wave frequency is easy to be calculated and updated with digital control. The current ripple is precisely predicted and controlled to minimize unnecessary circulation loss. The high current ripple at the inverter side can be considerably canceled by the parallel interleaved configuration. LCL filter is used to further attenuate the current ripple and improve the power quality at the grid side. The switching loss can be significantly reduced especially by using wide band-gap device with low turn-off loss. The power density is greatly improved owing to high switching frequency and low component parameters of the filter. A 4.5 kW simulation and experimental prototype interfacing 400 V DC with three-phase 110 V AC grid are developed to verify the performance of the proposed control strategy.

Index Terms—Parallel interleaved three-phase VSI, zero voltage switching, variable switching frequency control, space vector modulation

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