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Switching Power Converters, 2nd Edition by Dorin O. Neacsu

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5

Vectorial PWM for Basic Three-Phase Inverters

Previous chapters have explained the need for pulse width modulation (PWM), control of three-phase converters and presented some conventional methods that generate PWM on each phase independently. Some limitations in their practical implementation have stimulated efforts to find other principles to generate PWM controls. The most remarkable is the analysis of the three-phase inverter in the complex plane by the Vector Space theory. Understanding the mathematical representation of the inverter operation in the complex plane provided a tool for the generation of a new PWM algorithm called space vector modulation (SVM). (Note the difference between a vector space, which means a space of vectors, ...

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