Abstract：High input frequency will be a great challenge to the two-stage matrix converter (TSMC) when it is applied to 360~800Hz aero variable-speed constant-frequency generation system. Low order harmonics are observed in both output voltages and input currents of TSMC if the conventional asymmetric dual space vector modulation is used. In this paper, the conception of pulse orthocenter is introduced via a simplified Buck circuit model, and the influence of pulse orthocenter drifting on actual output voltage is demonstrated. The harmonic spectrum of TSMC is then analyzed, indicating that asymmetric modulation causes 3nωin±(3m±1)ωo low order harmonics in output voltages and (3n±1)th order harmonics in input currents. Analysis results are verified by simulation and experiment, providing theoretical basis for further performance optimization of TSMC.
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