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This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using odd-harmonic repetitive control, and aims at obtaining good closed-loop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller,...
This paper derives the inherent relationship between repetitive control (RC) and resonant control. RC is a “broad spectrum” but a slow harmonic suppressor, while resonant control is fast but can be only used to eliminate one specific frequency signal. Most important, based on this, a general internal model principle (IMP) based controller is proposed to offer “tailor-made” high performance control...
The design of a multiphase DC/DC power converter with bounded switching frequency based on the sliding mode control concept is proposed whose main goal is the suppression of chattering. In the framework of this approach: the width of hysteresis loops of switching elements are selected such that oscillation frequency is the same in all phases; the switching command in each phase is chosen as a function...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
Unlike conventional power system, the system voltage and frequency of some renewable energy resources based stand-alone distribution generation (DG) system maybe controlled by power electronics converters. This paper presents the control of parallel operation multi-converters in a DG system. The investigated stand-alone DG system is constructed by two local DG subsystems; in each of them, two power...
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