Microcontroller-based Walsh function PWM modulation with harmonic injection technique

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...

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Bibliographic Details
Main Authors: Rosu, S G, Radoi, C, Florescu, A, Stocklosa, O
Format: Conference Proceeding
Language:English
Subjects:
Computer simulation
Curve fitting
Equations
Frequency
Hardware
Phase modulation
Pulse inverters
Pulse width modulation
Pulse width modulation inverters
Voltage
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Summary: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.
DOI:10.1109/AQTR.2010.5520680