Abstract
In order to eliminate narrow pulses completely, this paper presents a novel carrier-based pulse width modulation (CBPWM) strategy applying to high-frequency link matrix converter (HFL-MC). Following the De-Re-couple idea, a single-phase to three-phase MC is equivalent to two full-bridge inverters according to the polarity of input voltage. The voltage of switches in two full-bridge inverters is analyzed and derived the duty cycles of switches according to the relationship between the state and the voltage of the switch. The duty cycles of three phases in the two inverters are integrated into a unified expression to generate the final modulation waves. A dual modulation strategy is proposed to compare modulation waves and a triangular carrier, which can achieve almost constant duty cycle of gating signals regardless of output voltage change. Therefore, the narrow pulses are eliminated fundamentally. Finally, the experimental results are given to show the advantages and the effectiveness of the proposed modulation strategy.
Highlights
Traditional inverters realize electrical isolation through a line-frequency transformer (LFT)
In [8] and [9], high-frequency link matrix converter (HFL-MC) is divided into two full-bridge inverters based on De-Re-coupling idea and a novel integration Sinusoidal pulse width modulation (SPWM) strategy is proposed, which achieved high-frequency link (HFL)-MC adaptive one-step commutation
In [10], a new PWM switching technique for three-phase grid-tie HFL-MC is proposed. This special SPWM strategy minimizes the number of switching transitions of the MC, and has the merits of high-power density and high efficiency compared with the conventional one
Summary
Traditional inverters realize electrical isolation through a line-frequency transformer (LFT). The primary side of the high-frequency transformer is a basic Hbridge with 4 basic IGBT devices Sl (l∈{1, 2, 3, 4}) for generating high-frequency square waves and the secondary side is a MC with single-phase input and three-phase output This single-phase to three-phase MC consists of six bidirectional switches, and each bidirectional switch cell is made up of two common IGBT devices controlled independently. The analysis method of switches Sbp and Scp is the same as that of Sap, and the duty cycles of the other two legs db and dc can be derived in the same way. In the first half cycle, the switch Sap plays the main role, and the state of Sap has little effect on the current, but they are opposite in the second. Use the same method to distribute the duty cycle of each switch of the other two legs
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