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This paper presents an integrated DC-DC buck converter using the synthetic ripple hysteresis control scheme with a fast transient path to define the boundary of hysteresis band. The hysteresis band and switching frequency depend on load current changes; therefore, it accelerates regulation and reduces overshoot. Full chip simulation results indicated output voltage recovery time is shortened within...
The Brushless Doubly-Fed Induction Generator (BDFIG) shows commercial promise as replacement for doubly-fed slip-ring generators for wind power applications by offering reduced capital and operational costs due to its brushless operation. In order to facilitate its commercial deployment, the capabilities of the BDFIG system to comply with grid code requirements have to be assessed. This paper, for...
This paper presents a new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
In this paper a fuzzy controller is designed for a recently developed voltage-boosting converter, named KY converter. The fuzzy controller neatly controls the switches of a 2nd-order KY converter via pulse-width-modulation (PWM) technology, which yields the voltage conversion ratio 2-plus-D where D represents the duty cycle. Experimental results show that the design simultaneously achieves faster...
This paper deals with analysis and reduction of dc-voltage fluctuations in a single-phase active power filter caused by a sudden load change. The analysis reveals that the delay time of the harmonic detection causes dc-voltage fluctuations in transient states. A new control method is proposed to reduce the dc-voltage fluctuations, based on the analysis. As a result, the dc capacitor can be reduced...
This paper proposes a novel UPFC damping control scheme using fuzzy controllers working on local signals. The design of controller is based on the time-domain analysis of the system transient energy function (TEF) and implemented by using fuzzy controllers to damp low frequency electromechanical power oscillations. The detailed design procedure of fuzzy based damping controllers is firstly addressed...
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