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Microcontroller-based Walsh function PWM modulation with harmonic injection technique

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4 Author(s)
Rosu, S.G. ; Politeh. Univ. of Bucharest, Bucharest, Romania ; Radoi, C. ; Florescu, A. ; Stocklosa, O.

An improved pulse width modulation (PWM) method for three-phase inverters using the Walsh function harmonic elimination method with harmonic injection technique is presented, together with a noniterative algorithm that produces a set of linear equations that relates switching angles with the output phase voltage fundamental. The approach used gives a set of solutions with a near-linear trajectory which can be approximated by straight-line curve fitting. Thus, on-line control of fundamental amplitude and frequency is possible with a microcontroller-based implementation. The novel use of harmonic injection technique maximizes the output line voltage fundamental. The theoretical predictions are confirmed by computer simulation and DSC-based hardware implementation.

Published in:

Automation Quality and Testing Robotics (AQTR), 2010 IEEE International Conference on  (Volume:3 )

Date of Conference:

28-30 May 2010

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