3-Phase Overmodulation

Purpose

Extend linear range of modulation index for 3-phase inverters

Library

Control / Modulators

Description

../../_images/overmodulation.svg

For three-phase signals, this block extends the linear range of the modulation index from \([-1, 1]\) to \([-1.154, 1.154]\) by adding a zero-sequence offset. This block may be used for the control of three-phase converters without neutral point connection such as the IGBT Converter (3ph).

Fig. 171 illustrates the working principle of the 3-Phase Overmodulation block in conjunction with the Symmetrical PWM.

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Fig. 171 Working principle of the 3-Phase Overmodulation block