Abstract
In this paper, different Pulse Width Modulation (PWM) strategies for operating with a low-switching frequency, a topology that combines Conventional Matrix Converters (CMCs), and Coupled Reactors (CRs) are presented and discussed. The principles of the proposed strategies are first discussed by a conceptual analysis and later validated by simulation. The paper shows how the combination of CMCs and CRs could be of special interest for sharing the current among these converters’ modules, being possible to scale this solution to be a modular system. Therefore, the use of coupled reactors allows one to implement phase shifters that give the solution the ability to generate a stair-case load voltage with the desired power quality even the matrix converters are operated with a low-switching frequency close to the grid frequency. The papers also address how the volume and weight of the coupled reactors decrease with the growth of the fundamental output frequency, making this solution especially appropriate for high power applications that are supplied at high AC frequencies (for example, in airport terminals, where a supply of 400 Hz is required).
Highlights
The energy conversion in the AC grid realized by power electronics devices always needs efficiency, reliability, and compatibility [1]
To formulate conclusions one should consider the results presented in Figure 20b, in which the Root Mean Square (RMS) load currents have been compared to the reference current
This article studies nature and presents conceptual research and discusses the different Pulse Width Modulation (PWM) strategies for operating, with a low-switching frequency for the proposed topology. It shows how the unconventional combination of Conventional Matrix Converters (CMCs) modules and Coupled Reactors (CRs) could improve the quality of energy conversion
Summary
The energy conversion in the AC grid realized by power electronics devices always needs efficiency, reliability, and compatibility [1]. Reduction of switching frequency of the power electronic devices without a significant decreases of the output voltage quality can be achieved by using multilevel AC–DC–AC topology [8]. This device converts an AC input voltage into the DC voltage and the voltage smoothing bulk electrolytic capacitor in the DC-link circuit is required for this purpose. To transfer the obtained energy to the grid, the generated voltage should be converted and synchronized with the three-phase source This task is performed with the use of power electronic converters, by the matrix converter in particular. The main goal of the authors of the publication was to develop such modulation and preliminary simulation studies
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