Overmodulation techniques for the three-to-five phase indirect matrix converter with space vector PWM

This paper proposes three overmodulation schemes in the three-to-five phase indirect matrix converter. The first scheme uses only the adjacent large vectors to produce the reference output voltages. The second scheme improves on that by reducing vector elimination in the d₂-q₂ vector space based on the requirements of the output. The third scheme reduces the overmodulation requirements of the inverter stage by utilizing the available dc-link voltage. All three schemes are shown to be able to increase the voltage transfer ratio of the three-to-five phase indirect matrix converter from 0.7886 to 0.9233 by producing some low order harmonics. The second and third schemes have lower THD generation compared to the first scheme, but require additional calculation for vector elimination. The third scheme generates lower THD on the output compared to the second scheme, but produces some even harmonics. Experimental results from a prototype three-to-five phase indirect matrix converter validate the three proposed schemes.