Abstract
This paper presents a simple space vector modulation (SVM) strategy for a three-phase indirect matrix converter (IMC) to reduce common-mode voltage (CMV) and output harmonic distortion. To suppress the CMV peak value to 57.7% of the input phase voltage, three active voltage vectors are used to generate the desired output voltage with arbitrary amplitude and frequency. However, the output waveform quality of the IMC deteriorates due to the absence of zero voltage vectors. To overcome this problem, this paper proposes to redesign control of the rectifier stage by utilizing three active current vectors instead of two, as is common. Consequently, a constant average DC-link voltage is achieved, which can improve the output performance in terms of output voltage and current harmonic distortion. Compared to the existing strategies, the proposed strategy can reduce the CMV and maintain output harmonic distortion without increasing the computation burden. Implementation of the proposed strategy is also straightforward and simple. Simulated and experimental results are provided to verify the effectiveness of the proposed strategy.
Highlights
The matrix converter (MC) technology has been discussed as an all-silicon approach for motor drive applications due to the lack of a large energy storage system [1]–[3]
The topology of MC is often classified into direct matrix converter (DMC) and indirect matrix converter (IMC), which corresponds to the one-stage and two-stage characteristics, respectively
This paper presents a simple space vector modulation (SVM) strategy that can reduce the common-mode voltage (CMV) as well as improve the output performance for a threephase IMC
Summary
The matrix converter (MC) technology has been discussed as an all-silicon approach for motor drive applications due to the lack of a large energy storage system [1]–[3]. In [18], a modulation method is proposed to both reduce the CMV and the output voltage and current harmonics distortions for a five-leg IMC fed open-end winding load. Li et al presented a new SVM method based on the concept of open-current vector to suppress the peak value of CMV without degraded the output performance [19]. The unique three-vector switching technique is realized to successfully modulate the rectifier and inverter stages of the three-phase IMC. Three active current vectors are used for the rectifier modulation to obtain the constant average dc-link voltage, which can improve the output performance. To put these in perspective, the switching pattern of the IMC is organized as shown in Fig. 4 when the reference input current and output voltage vectors are in sector 1.
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