Optimized state feedback regulation of 3DOF helicopter system via extremum seeking

In this paper, an optimized state feedback regulation of a 3 degree of freedom (DOF) helicopter is designed via extremum seeking (ES) technique. Multi-parameter ES is applied to optimize the tracking performance via tuning State Vector Feedback with Integration of the Control Error (SVFBICE). Discrete multivariable version of ES is developed to minimize a cost function that measures the performance of the controller. The cost function is a function of the error between the actual and desired axis positions. The controller parameters are updated online as the optimization takes place. This method significantly decreases the time in obtaining optimal controller parameters. Simulations were conducted for the online optimization under both fixed and varying operating conditions. The results demonstrate the usefulness of using ES for preserving the maximum attainable performance

Digital AFC control of a three-phase three-wire unity-power-factor PWM rectifier

Nowadays, ac/dc power converters must fulfill more and more design constraints with respect to the electrical grid: harmonics reduction, operation with sags and swells and/or high grid impedances, etc. This is a challenge for the controllers, since they must be robust enough to ensure the stability of the system, specially when working the conditions are not the ideal ones. In this paper, a discrete-time control technique based on Adaptive Feed-forward Cancellation (AFC) is proposed for a three-phase three-wire rectifier with a LCL input filter. The continuous-time design method for resonators has been translated into the discrete-time domain. Thus, the controller has been entirely designed in discrete-time, avoiding approximate conversions of the controller from the continuous-time domain. Besides, the usual unit computational delay in sampled-data control systems is taken into account. The simulation results show that this kind of resonant control is not only robust, but also presents a good performance.Peer Reviewe

Digital AFC control of a three-phase three-wire unity-power-factor PWM rectifier

Nowadays, ac/dc power converters must fulfill more and more design constraints with respect to the electrical grid: harmonics reduction, operation with sags and swells and/or high grid impedances, etc. This is a challenge for the controllers, since they must be robust enough to ensure the stability of the system, specially when working the conditions are not the ideal ones. In this paper, a discrete-time control technique based on Adaptive Feed-forward Cancellation (AFC) is proposed for a three-phase three-wire rectifier with a LCL input filter. The continuous-time design method for resonators has been translated into the discrete-time domain. Thus, the controller has been entirely designed in discrete-time, avoiding approximate conversions of the controller from the continuous-time domain. Besides, the usual unit computational delay in sampled-data control systems is taken into account. The simulation results show that this kind of resonant control is not only robust, but also presents a good performance.Peer Reviewe

Diseño, implementación y evaluación de diferentes estrategias de control orientadas al rechazo activo de perturbaciones para un rectificador PFC que permitan obtener una alta calidad de energía eléctrica medida desde los parámetros de PF y THD de corriente

Este trabajo muestra la implementación de controladores no convencionales (Resonadores, Repetitivos, y GPI), para la corrección dinámica del factor de potencia en rectificadores monofásicos y trifásicos conmutados, dichas implementaciones permiten aumentar el desempeño en variables como factor de potencia y THD, aumentando de esta manera la calidad de la energía que estos dispositivos utilizan de la redes eléctricas. Rechazando las perturbaciones inherentes en este sistema como presencia de armónicos, desbalances, SAC, y cambios de carga.Abstract. This work shows the implementation of unconventional controllers (Resonators, repetitive, and GPI), for dynamic power factor correction switched in single and three phase rectifiers, these implementations allow increased performance variables such as power factor and THD, increasing Thus the quality of these devices utilize energy of power grids. Rejecting disturbances inherent in this system as the presence of harmonics, imbalances, SAC, and load changes.Maestrí