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The problem of Active Disturbance Rejection control for active power filters subject to periodic disturbances is tackled by means of a discrete-time Generalized Proportional Integral (GPI) observer-based control. An extended state observer-based control scheme is proposed for the active filter application according to the Active Disturbance Rejection strategy. In this scheme, model uncertainties and...
In this paper, a modified Sheppard–Taylor converter operating in continuous inductor current mode and discontinuous capacitor voltage mode (CICM/DCVM) is studied and implemented. The operation sequences are described and the averaged model of the converter over a switching cycle is developed. With the obtained, the dc characteristics of the converter were derived, and design criteria for components...
In this article a Current Source Matrix Converter is considered. A feedback control system with Power Factor Correction is developed for the converter Direct and Indirect structures. The operation principles and modulation techniques are introduced and described. Also the proposed control strategy is verified by computer simulation and obtained results are published and investigated.
This paper presents a non-isolated boost integrated buck rectifier/energy storage DC-DC (NI-BIBRED) converter fed brushless DC (BLDC) motor dive. The speed of proposed drive is controlled by adjusting the DC link voltage of voltage source inverter (VSI) feeding a BLDC motor. The BLDC motor is electronically commutated to operate the VSI in fundamental frequency switching for reduced switching losses...
This paper presents the proposal of a three-phase current-source shunt active power filter (CS-SAPF) with photovoltaic grid interface. The proposed system combines the compensation of reactive power and harmonics with the injection of energy from a solar photovoltaic array into the electrical power grid. The proposed equipment presents the advantage of giving good use to the current-source inverter,...
This work presents a new configuration of power factor correction (PFC) based isolated Sheppard-Taylor converter for feeding brushless DC (BLDC) motor drive. In this work, fundamental frequency switching (FFS) of voltage source inverter (VSI) is used for reducing the switching losses in six solid-state switches of the VSL This is achieved by electronic commutation of BLDC motor and the DC bus voltage...
This paper deals with the power factor correction (PFC) in a brushless DC (BLDC) motor drive using a boost-forward single-stage isolated power-factor-corrected power supply (SSIPP). The DC link voltage of the voltage source inverter (VSI) feeding BLDC motor is varied for controlling the speed of a BLDC motor. Moreover, the BLDC motor is commutated electronically such that the six solid state switches...
Traditional LED drivers generally use electrolytic capacitor as the storage element which will restrict the lifetime and power density of drivers. In this paper, an electrolytic capacitor-less LED driver which pluses an auxiliary winding in the transformer and an additional full-bridge circuit to Flyback converter is proposed. It not only eliminates the electrolytic capacitor to extend the lifetime,...
In general, Boost circuit is widely used as PFC circuit to achieve high power factor (PF), but the power supply needs to add a Buck circuit in the case of low-voltage output applications. Two-stage circuit requires more components and two control circuits. On the other hand, as the power levels increase, the full-bridge diode rectifier reduces the converter efficiency due to the large conduction losses...
This paper introduces the multifunctional circuit which is called as active DC-link circuit (ADLC) in single-phase diode rectifier system without electrolytic capacitor. This circuit is located to DC-link node in parallel and shows many performances such as energy buffer for decoupling ripple power and power factor correction (PFC) by controlling instantaneous system power. Therefore the diode rectifier...
A LC filter can be added to the input of the conventional buck converter to make the converter operate in discontinuous capacitor voltage mode. In this mode, the converter obtains the inherent power factor correction. Besides, both the input and output current will be continuous. This makes it possible for the converter operating at a high power level range. The input current will follow the input...
This paper presents a bridgeless SEPIC topology with Power Factor Correction (PFC) to charge electric vehicle battery. The converter offers a few advantages such as reduce total component count and reduction of conduction loss during the conversion AC to DC, hence higher overall system efficiency. The PFC converter operated under continuous conduction mode (CCM) with average current mode control strategy...
In this paper, a novel single-stage ac/dc converter for micro-scale wind power generation system is proposed. The power factor correction of input line currents for wind power is achieved so as to reduce the harmonic currents and decrease the noise of three-phase wind turbine. The proposed converter has both zero-voltage switching in the primary-side switches and zero-current switching in the secondary-side...
In this paper, a new single phase ac-dc PFC bridgeless rectifier with multiplier stage to improve the efficiency at low input voltage and reduce the switch-voltage stress, is introduced. The absence of an input rectifier bridge in the proposed rectifier and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved...
A large Petrochemical company installed nearly 50,000 HP of electrical submersible pumps (ESP's) at an existing midwest USA oil field. Being equipped with Adjustable Speed Drives (ASD's) these ESP's introduced high levels of current harmonic distortion which resulted in 14%–19% voltage harmonic distortion at the Electrical Utility supply. Initially, the Utility noticed the low power factor (PF) and...
This paper introduces a new bridgeless rectifier that operates with high power factor and high efficiency. The proposed rectifier is derived from the conventional single-ended primary inductance converter (SEPIC) and it is suitable for universal line applications. Multiplier cells have been introduced in the literature to extend the converter gain and to decrease the voltage stresses across the converter...
A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering...
Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED-ballast are important factors in order to improve the overall system. In addition, size and costs are a relevant factor in the highly competitive LED market. With the benefits...
A modular interleaving power cell system for input voltage range of 19–265 V DC or AC consists of 15 or 6 Watts cells, operates at fixed frequency. A boost stage providing PFC, and an isolating regenerative snubber fly-back stage delivering 30 V DC at the output is combined.
Wave energy converters generally suffer from a low operating power factor due to the nature of the long wavelength water wave and the inductance of the electrical generator employed in the conversion process. A Forced Commutated Series Capacitor (FCSC) converter can be connected between the generator and the load circuit to prevent power factor degradation. This paper describes the effectiveness of...
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