Abstract
In this article, an improved space vector pulsewidth modulation strategy for matrix converter is proposed under unbalanced input voltages. First, to obtain the higher output voltage, two novel space vector pulsewidth modulation strategies based on the linear superimposition principle are presented by modifying the magnitude of the reference output voltage and the reference input current vectors. Second, in order to evaluate the performance of the proposed strategy, the harmonic characteristics of the input currents and output voltages are quantitatively analyzed by employing the double Fourier integral transform method. The novelty of this article lies not only in the modification of a conventional space vector pulsewidth modulation strategy for a higher output voltage under unbalanced input voltages, but also in a quantitative analysis that accurately evaluates the overmodulation performance with input unbalance using the double Fourier integral transform approach. Finally, the performance of the proposed strategy and the correctness of the harmonic analysis method are verified by the comprehensive simulation and experimental results for matrix converters.
Highlights
Three-phase matrix converter (MC) has recently gained tremendous attention for its numerous advantages, such as sinusoidal input and output currents, unity input power factor, and compact design without dc-link energy storage [1]
In [2], the modulation index used in space vector pulsewidth modulation (SVPWM) of the MC is calculated adaptively based on the instantaneous amplitude of the input voltage
In order to evaluate the performance of the proposed strategy, the harmonic characteristics of the input currents and output voltages are quantitatively analyzed by deploying the double Fourier integral transform method [24], [25]
Summary
Three-phase matrix converter (MC) has recently gained tremendous attention for its numerous advantages, such as sinusoidal input and output currents, unity input power factor, and compact design without dc-link energy storage [1]. Due to the lack of intermediate energy storage capacitors, the voltage imbalance induced by asymmetric loads in the power grid will directly cause low-order input/output harmonic currents To solve this issue, various control methods of MCs under unbalanced input voltages have been proposed [2], [6]–[9]. In the previously mentioned researches, the maximum attainable output voltages are reduced due to the variation in magnitude of the input voltage vector caused by the negative sequence components To address this issue, in this article, an improved SVPWM strategy for MC is proposed, which operates the MC under unbalanced input voltages, with output voltage less or greater than the maximum attainable one.
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