Abstract
The main aim of the paper is to find a control method for a multilevel matrix converter (MMC) that enables the elimination of common mode voltage (CMV). The method discussed in the paper is based on a selection of converter configurations and the instantaneous output voltages of MMC represented by rotating space vectors. The choice of appropriate configurations is realized by the use of space vector modulation (SVM), with the application of Venturini modulation functions. A multilevel matrix converter, which utilizes a multilevel structure in a traditional matrix converter (MC), can achieve an improved output voltage waveform quality, compared with the output voltage of MC. The carrier-based implementation of SVM is presented in this paper. The carrier-based implementation of SVM avoids any trigonometric and division operations, which could be required in a general space vector approach to the SVM method. With use of the proposed control method, a part of the high-frequency output voltage distortion components is eliminated. The application of the presented modulation method eliminates the CMV in MMC what is presented in the paper. Additionally, the possibility to control the phase shift between the appropriate input and output phase voltages is obtained by the presented control strategy. The results of the simulation and experiment confirm the utility of the proposed modulation method.
Highlights
A multilevel matrix converter (MMC) is a frequency converter, whose topology [1,2,3,4,5,6,7,8] was proposed by analogy to multilevel inverters and its aim is the reduction of the voltage rating of the switches with respect to the supply voltages and the further improvement of the synthesized current and voltage waveforms
The problem with appearing common mode voltage (CMV) is concerned with all the converters being controlled by the use of the pulse width modulation (PWM) method, both indirect frequency converters with a DC link, as well as a direct matrix converter (MC) and MMC
Because the topology of MMC is the modification of conventional MC, the analysis of the cancelation methods of CMV used in MC would be valuable in finding the control method to eliminate the CMV in MMC
Summary
A multilevel matrix converter (MMC) is a frequency converter, whose topology [1,2,3,4,5,6,7,8] was proposed by analogy to multilevel inverters and its aim is the reduction of the voltage rating of the switches with respect to the supply voltages and the further improvement of the synthesized current and voltage waveforms. Two scientific centres paid attention to the analysis of MMC operations and two different control methods were developed there. The main goal in using either of the modulation methods in controlling MMC is the synthesis of the referenced sinusoidal output voltage and sinusoidal input current by controlling the input displacement angle. The application of these methods is involved with appearing CMV on the output terminals. The problem with appearing CMV is concerned with all the converters being controlled by the use of the pulse width modulation (PWM) method, both indirect frequency converters with a DC link, as well as a direct matrix converter (MC) and MMC. Because the topology of MMC is the modification of conventional MC, the analysis of the cancelation methods of CMV used in MC would be valuable in finding the control method to eliminate the CMV in MMC
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