Hybrid Indirect Matrix Converter Immune to Unbalanced Voltage Supply, with Reduced Switching Losses and Improved Voltage Transfer Ratio

Abstract

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Control method for the two‐stage matrix converter to enhance the linear voltage transfer ratio

“…As can be seen from Table 3, the theoretical maximum VTR in [7,11,15,17] and this study are 0.955, ∞, 0.928, 0.97 and ∞, respectively. On the other hand, the required semiconductor switches in [7,11,15,17] are 22 and 18, respectively, while the number of the switches in this study is 20. However, it should be noted that the comparison of the number of the switches only gives a first overview of the performance of the topologies, because the current/voltage stress and the losses of the switches for each topology are quite different.…”

“…Regarding the input waveforms quality, 3TSMC has a superior performance than the others in terms of the total harmonic distortion (THD) of the input current because of the pre‐filtering effect of the third‐harmonic injection inductor [20], while [7, 17] have the inferior input current THD performance among the five methods due to the low‐order current harmonics caused by the fluctuant input power and over‐modulation, respectively. For the comparison of the output waveforms quality, in [15] the 3TSMC have the best output voltage THD performance, and the output voltage THD performance in [7, 11] is a little bit worse because of the higher inverter side DC link voltage, while the over‐modulation in [17] results in the worst output voltage THD performance.…”

“…However, the relatively low voltage transfer ratio (VTR) is one of the major drawbacks of the three-phase-to-threephase TSMCs, especially when TSMCs are applied in AC adjustable speed drives (ASDs), power supplies, and power systems and so on. Usually, there are two solutions to improve the VTR: one is altering the topology of TSMCs to boost the output voltage [7][8][9][10][11][12][13]; the other is applying modulation strategy to enhance the VTR [14][15][16][17][18][19].…”

“…For the first solution, extra circuits have to be added and merged into the conventional TSMCs. In [7, 8], two hybrid TSMC topologies with significant improvement of VTR have been proposed, which are formed by integrating an H‐bridge inverter and an auxiliary boost converter in the DC link of TSMC, respectively. In [9], the voltage boosting and unity VTR of TSMC was achieved by adding four extra switches to construct an equivalent AC–AC boost topology.…”

A Current Control Approach for an Abnormal Grid Supplied Ultra Sparse Z-Source Matrix Converter with a Particle Swarm Optimization Proportional-Integral Induction Motor Drive Controller

“…Table 2 shows a comparison between the results of this work and the other Z-source matrix converters in different reports in terms of quantity of elements in topology, maximum voltage transfer ratio, the quantity and values of Z-source elements, switching frequency, output current THD and maximum tolerated abnormality of input voltage. The proposed strategy drives an IM under 40% abnormal input voltage, while [27][28][29][30] have launched the static RL load. In the recommended topology, the overall volume and weight of the system is 2.3 L which is considerably lower than the conventional back-to-back converter with a volume of 4.6 L for the same power rating and thermal limitation of the USMC described in [31,32].…”