RESUMEN
The paper proposes a tuning procedure for a multioscillatory current controller in a three-phase three-wire grid connected converter operating under distorted voltage conditions. The control system should provide high quality sinusoidal currents. This is achieved by implementing internal models of expected disturbances - multioscillatory terms. Tuning of such systems is challenging if the objective is to guarantee a certain level of stability margins. The multiloop disk margin analysis may be a perfect candidate solution. This analysis combined with a global optimization produces controller gains that can be transferred to the physical system. The paper provides the first complete experimental verification of the multioscillatory full state feedback grid current control system with a designer specified stability margin in the form of disk radius.
RESUMEN
The paper presents a novel control method based on a dual thread speed controller with modified multi-oscillatory control for speed ripple reduction in a switched reluctance machine-based drive. The method is based on on-line phase current shaping. The paper describes a dual thread angle-sampled multi-oscillatory control (ASMOSC) theory for speed ripple reduction of a switched reluctance machine under variable speed. Description of the entire cascaded speed control system with linear controllers is also provided, along with an implementation description for ASMOSC. This includes practical hints on how to apply the control system to a dual core microcontroller. The frequency-domain stability analysis for a designed control system under variable speed conditions is presented. The overall performance of the control system is verified numerically and experimentally on a laboratory setup with an 4-phase 8/6 SRM-based drive.