A hybrid current control for a controlled rectifier

A current controller must satisfy the contradictory requirements of having a fast dynamic response in transient and a low harmonic content in steady state, characteristics that are found in linear and hysteresis controllers, respectively. Predictive current controllers partly satisfy these requirements but at expenses of complexity. The present work proposes an alternative approach for modifying the linear controller in order to have a faster response. This consists of the One Cycle Control (OCC) current controller modified by the use of a lead-lag compensator. An additional feature of this controller is that it can be implemented with DSP. Besides mathematical analysis, simulation and experimental results are presented to validate the proposed controller.