A multiinput converter for photovoltaic (PV) power system applications with power factor correction (PFC), maximum power point tracking (MPPT), and ripple-free input currents (RFIC) is proposed in this paper. With pha...
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A multiinput converter for photovoltaic (PV) power system applications with power factor correction (PFC), maximum power point tracking (MPPT), and ripple-free input currents (RFIC) is proposed in this paper. With phase-shifted pulse-width-modulation (PWM) control, the multiinput converter can draw power from the utility line and PV arrays individually or simultaneously and deliver it to the load. In addition, an almost unity power factor for the utility line and an MPPT for PV arrays can also be achieved. Moreover, the upper power switches of each input-stage circuit in the proposed converter are operated with zero-current-switching (ZCS) at turn-off transition and the lower ones are operated with zero-voltage-switching (ZVS) at turn-on transition. Hence, the switching losses of the power switches can be reduced. Experimental measurements are demonstrated to verify the performance of the proposed multiinput converter.
The improved current-doubler-rectifier zero-voltage-switching PWM full-bridge converter (CDR ZVS PWM FB converter) achieves ZVS for the switches in a wide load range with the use of the energy stored in the output fil...
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The improved current-doubler-rectifier zero-voltage-switching PWM full-bridge converter (CDR ZVS PWM FB converter) achieves ZVS for the switches in a wide load range with the use of the energy stored in the output filter inductances, and the rectifier diodes commute naturally, therefore no oscillation and voltage spike occurs. The transformer needs no special manufacture method to limit the leakage inductance. The ZVS achievement and the design considerations for the output filter inductances and the blocking capacitor are discussed for the improved CDR ZVS PWM FB converter. A 540 W prototype converter is built in the lab to verify the operational principle and design considerations for the improved converter, the experimental results are also included.
This paper proposes a family of modulation strategies for PWM three-level (TL) converters. The modulation strategies can be classified into two kinds according to the turn-off sequence of the two switches of the pair ...
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This paper proposes a family of modulation strategies for PWM three-level (TL) converters. The modulation strategies can be classified into two kinds according to the turn-off sequence of the two switches of the pair of switches. The concept of the leading switches and the lagging switches is introduced to realize soft-switching for PWM TL converters. The realization of soft-switching for both the leading switches and the lagging switches is proposed, based on which, soft-switching PWM TL converters can be classified into two kinds: zero-voltage-switching (ZVS) and zero-voltage and zero-current-switching (ZVZCS), for which the suitable modulation strategies are pointed out respectively from the family of modulation strategies. A novel ZVZCS TL converter is proposed, its operation principle and parameter design are analyzed, and the experimental results are included also.
In this paper, we present new Lyapunov and Lagrange stability results for pulse-width-modulated (PWM) feedback systems with linear and nonlinear plants. For systems with linear plants, we consider the noncritical case...
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In this paper, we present new Lyapunov and Lagrange stability results for pulse-width-modulated (PWM) feedback systems with linear and nonlinear plants. For systems with linear plants, we consider the noncritical case, where the poles of the transfer function of the plant are all in the left-half of the complex plane and the critical case, where one pole is at the origin while the remaining poles are all in the left-half of the complex plane. For these systems we apply the Direct Method of Lyapunov to establish new and improved results for both Lyapunov and Lagrange stability. As in most existing results for PWM feedback systems obtained by the Lyapunov method, we employ quadratic Lyapunov functions in our analysis. However, in the proofs we make use of different majorizations, requiring hypotheses that differ significantly from those used in the existing results. Additionally, and perhaps more importantly, we incorporate into our results optimization procedures that improve our results significantly. We demonstrate the applicability and quality of our results by means of five specific examples that are identical to examples presented in the literature. For PWM feedback systems with nonlinear plants we show that under reasonable conditions. the stability properties of the trivial solution of such systems can be deduced from the stability properties of the trivial solution of PWM feedback systems with corresponding linearized plant, for both noncritical and critical cases. (C) 2001 Published by Elsevier Science Ltd.
This paper proposes a family of modulation strategies including nine modulation strategies for PWM three-level converters. The modulation strategies can be classified into two kinds according to the turn-off sequence ...
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ISBN:
(纸本)780003464X
This paper proposes a family of modulation strategies including nine modulation strategies for PWM three-level converters. The modulation strategies can be classified into two kinds according to the turn-off sequence of the two power switches of the switches pair. The concept of the leading switches and the lagging switches is introduced to realize soft-switching for PWM three-level converters. The realization of soft-switching for both the leading switches and the lagging switches is proposed, based on which, soft-switching techniques for PWM three-level converters can be classified into two kinds: Zero-Voltage-Switching (ZVS) and Zero-Voltage and Zero-Current-Switching (ZVZCS). The modulation strategies and topologies for the two kinds of soft-switching PWM three-level converters are proposed.
Dynamical adaptive regulation of pulse-width-modulation (PWM) controlled power supplies is proposed using a suitable combination of average dynamical input–output linearization and the ‘backstepping’ controller des...
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Dynamical adaptive regulation of pulse-width-modulation (PWM) controlled power supplies is proposed using a suitable combination of average dynamical input-output linearization and the 'backstepping' controlle...
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Dynamical adaptive regulation of pulse-width-modulation (PWM) controlled power supplies is proposed using a suitable combination of average dynamical input-output linearization and the 'backstepping' controller design method. Nonlinear average models of de to de power supplies are not transformable to parametric pure nor parametric strict feedback canonical forms by means of parameter-independent state co-ordinate transformation. A more direct approach is therefore proposed for implementing the fundamental ideas related to the so called 'non-overparametrized' adaptive backstepping algorithm which avoids explicit transformations to the above mentioned canonical forms. Dynamical adaptive feedback controllers are developed for the regulation of the input-inductor current towards desirable constant values. The validity of the proposed approach, regarding control objectives and robustness with respect to unmodelled, yet unmatched, and bounded stochastic perturbation inputs, is tested through digital computer simulations. (C) 1997 by John Wiley & Sons, Ltd.
In this article, a new approach is proposed for the design of a pulsewidth Modulated (PWM) feedback control scheme, regulating a Full Bridge Buck Converter in both stabilization and AC signal tracking tasks. The appr...
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In this article, a new approach is proposed for the design of a pulsewidth Modulated (PWM) feedback control scheme, regulating a Full Bridge Buck Converter in both stabilization and AC signal tracking tasks. The approach is based on the specification of a dynamical feedback control law which accomplishes asymptotic stabilization to a pre-selected constant operating point, or, alternatively, indirect asymptotic sinusoidal output voltage tracking for the average PWM converter model. The approach emphasizes the use of Fliess's Generalized Observability Canonical Form of the average converter model and partial inversion techniques.
Adaptive discontinuous feedback regulators, of static nature, are proposed for the stabilization of switch-mode controlled systems. An average pulse-width-modulation (PWM) model controlled by a piecewise smooth, and l...
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Adaptive discontinuous feedback regulators, of static nature, are proposed for the stabilization of switch-mode controlled systems. An average pulse-width-modulation (PWM) model controlled by a piecewise smooth, and limited, duty ratio function is used as the basis for a static adaptive controller design which locally stabilizes the system motions, through imposed linearization, towards a constant equilibrium point.
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