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Extend linear range of modulation index for 3-phase inverters
Control / Modulators
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.
The figures below illustrates the working principle of the 3-Phase Overmodulation block in conjunction with the Symmetrical PWM.