Simulation of enhanced phased-shifted PWM carrier disposition for interleaved voltage-source inverter

Power electronic

This a novel implementation of pulse width modulation that improves the quality of the line- to-line output voltages in interleaved multiphase voltage-source inverters(VSIs). In multiphase VSIs with n interleaved parallel-connected legs, the best single-phase output voltage is achieved when the carriers are evenly phase shifted. However, switching among non adjacent levels can be observed at regular intervals in the line-to- line voltages, causing bad harmonic performance. With the proposed method, switching in the line-to- line voltages happens exclusively between adjacent levels. The modulator utilizes two sets of n evenly phase-shifted carriers that are dynamically allocated. Because of its generality, the proposed implementation is valid for any number of phases and any number of legs in parallel. A MATLAB/Simulink model has been set up for simulation purposes. Selected experimental results obtained from a three-phase VSI made up with two and three legs in parallel per phase are reported, confirming the enhancement attained with the proposed implementation.

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