A New Modulation Method for a Bidirectional Isolated Three-Phase AC/DC Dual-Active-Bridge Converter to Realize Higher Efficiency in Wide Output Voltage Range

A Novel Control Method to Improve Efficiency in Wide Output Voltage Range for Bidirectional Isolated Three-Phase AC/DC Converter Based on Matrix Converter

“…In this subsection, the modulation methods of Ref. (7) and (8) In this paper, Mode I is defined as an operation when 𝛿, 𝑑 m , 𝑑 z1 are manipulated with 𝑑 z2 = 0, that is, zero voltage period is not introduced in the INV output voltage. On the other hand, Mode II is defined as an operation when 𝛿, 𝑑 m , 𝑑 z2 are manipulated with 𝑑 z1 = 0, that is, zero voltage is not introduced in the MC output voltage.…”

“…However, the number of switching in one carrier period increases and the switching loss increases. The RMS value of high frequency current is reduced by introducing zero voltage period in the output of MC (7) or INV (8) . These methods are used for buck operation and for boost operation, respectively.…”

Surge voltage reduction method for dual active bridge matrix converter using circulating current

“…On the other hand, circuits using matrix converters were proposed to convert three-phase AC to high-frequency AC. [3][4][5] With direct conversion from three-phase AC to high-frequency AC, no capacitors or initial charging cir-cuits are needed in DC module. Particularly, in case of DAB matrix converters with full-bridge inverter on one side of DAB converter replaced by three-phase matrix converter, no smoothing inductors are needed on grid side and DC side, thus promising a compact design.…”

“…Particularly, in case of DAB matrix converters with full-bridge inverter on one side of DAB converter replaced by three-phase matrix converter, no smoothing inductors are needed on grid side and DC side, thus promising a compact design. 4,5 A number of soft switching techniques were proposed for DAB converters. 6 However, DAB matrix converters are different in that voltage applied at one end of inductor is not constant, and grid frequency fluctuates; besides, grid current is controlled to a sine wave.…”