Pole-restraining control of three-phase Active Front End

State-of-the-art control approaches often neglect the time-variant characteristics of power-electronic systems in favour of a time-averaged approach. In consequence, the resulting system is partly instable, thus not optimally controlled. The pole-restraining control (PRC) removes the inherent instability, giving considerably improved dynamic behaviour. These improvements are demonstrated for three-phase Active Front Ends (AFE). The essentials of the pole-restraining control approach are explained, the improved transient behaviour is illustrated by comparison to other state-of-the-art control schemes.