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A two stages robust Generalized PI feedback controller for a single-phase active multilevel rectifier is proposed. The controller is based on the system modeled in the d-q synchronous reference frame. Based on input-output linearization theory a current controller that decouples the d-q components and compensates unknown perturbations is obtained. Performing a transformation of the system, stability...
A control scheme constituted by a nonlinear state feedback current controller and a PI voltage controller for a single-phase active multilevel rectifier is designed. The control is based on the system modeled in the d-q synchronous reference frame. Through input-output linearization theory a current controller that decouples the d-q components is obtained. Stability of zero dynamics is verified. Due...
The increasing speed-gap between processor and memory and the limited memory bandwidth make last-level cache performance crucial for CMP architectures. non uniform cache architectures (NUCA) have been introduced to deal with this problem. This memory organization divides the whole memory space into smaller pieces or banks allowing nearer banks to have better access latencies than further banks. Moreover,...
In recent years, the use of active rectifiers has become common to correct problems as low power factor and harmonics in the AC mains, besides it can compensate the DC bus before load changes. Some of these rectifiers are also able to compensate voltage sags. Power losses studies have been developed for this kind of topologies; however, the behavior of these is not mentioned under voltage sags conditions...
Usually, active rectifiers are used as power factor compensators besides to its natural ability to maintain load regulation in the DC bus. Since the AC mains can be affected by voltage sags, is convenient to extend the Single- Phase Active Multi-Level Rectifier functions to have ride- through voltage sag capability. It is important to know the safety operation limits under all possible circumstances...
An active rectifier has two control objectives: current tracking and voltage regulation. Against dynamic nonlinear loads or voltage sags it is difficult to achieve both objectives. This paper deals whit analysis, design and implementation a passivity-based control to track a current reference and a PI controller to regulate de DC bus voltage. Moreover, the bus regulation has adequately performance...
Voltage sags are one of the most important power quality problems, affecting industrial and commercial customers. Industrial processes are particularly sensitive to relatively minor voltage sags. Utilities have been improved their fault-recovery capabilities, however it is still impossible to eliminate faults in the systems. Therefore, customers will have to improve the ride-through capability of...
Voltage sags are one of the most important power quality problems, affecting industrial and commercial customers. These events are usually associated with a fault somewhere on the supplying power system. Industrial processes are particularly sensitive to relatively small voltage sags; therefore, customers will have to improve the ride-through capability of the system equipment in their facilities...
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