AC/DC Three-Level PWM Converter
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Mohsen Aleenejad on 30 Jul 2020
The reason is that the topology is not physically able to follow the negative reference. The load consists of two parallel resistive branches. There is no power/energy generaor (at the right side of the converter) to constantly put back the energy into the 600V three phase system. As a rsult, the active power is always positive and Id cannot remain negative.
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