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JPE, Vol. 18, No. 1, January 2018
Double Line Voltage Synthesis Strategy for Three-to-Five Phase Direct Matrix Converters
Rutian Wang, Yanfeng Zhao, Xingjun Mu, and Weiquan Wang
Area High Power Converters
Abstract This paper proposes a double line voltage synthesis (DLVS) strategy for three-to-five phase direct matrix converters. In the proposed strategy, the input and expected output voltages are divided into 6 segments and 10 segments, respectively. In addition, in order to obtain the maximum voltage transfer ratio (VTR), the input line voltages and ˇ°source keyˇ± should be selected reasonably according to different combinations of input and output segments. Then, the corresponding duty ratios are calculated to determine the switch sequences in different segment combinations. The output voltages and currents are still sinusoidal and symmetrical with little lower order harmonics under unbalanced or distorted input voltages by using this strategy. In addition, the common mode voltage (CMV) can be suppressed by rearranging some of the switching states. This strategy is analyzed and studied by a simulation model established in MATLAB/Simulink and an experimental platform, which is controlled by a DSP and FPGA. Simulation and experimental results verify the feasibility and validity of the proposed DLVS strategy.
Keyword Common mode voltage,Direct matrix converter,Double line voltage synthesis strategy,Source key,Three-to-five phase,Unbalanced or distorted input voltages
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