Nonlinear current control of three phase converter

The workhorse in static electric power processing both in AC-DC and in DC-AC power conversion is the three-phase full-bridge power converter. This paper is concerned with the strange behaviour of the tolerance band AC current control of a three-phase full bridge AC-DC power converter with six controlled switches and a high filter capacitor on the DC side. Here, the current control differs from the one of a DC-AC inverter due to the fact that the supply voltage, frequency and impedance are known and both the supply voltage and the frequency are near constant. Using a space vector-based special control algorithm, the system response received from simulation can be chaotic but it can be locked to a periodic orbit as well. The periodic response is preferred.