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Search Results (3)

Search Parameters:
Keywords = single-phase uncontrolled rectifier

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17 pages, 2606 KiB  
Article
Experimental Investigation of Controlled and Uncontrolled Rectifiers for Low-Power Wind Turbines
by Ahmad Alzahrani
Appl. Sci. 2023, 13(7), 4120; https://doi.org/10.3390/app13074120 - 23 Mar 2023
Cited by 2 | Viewed by 3247
Abstract
The holistic objective of producing 100% renewable generated electricity motivates the development of low-power and efficient domestic wind turbines. The wind turbine’s efficiency can be maximized by operating it in a variable speed configuration, thus harvesting all the wind power. However, the harvesting [...] Read more.
The holistic objective of producing 100% renewable generated electricity motivates the development of low-power and efficient domestic wind turbines. The wind turbine’s efficiency can be maximized by operating it in a variable speed configuration, thus harvesting all the wind power. However, the harvesting process requires a two-stage conversion from AC to DC and from DC–DC or DC–AC. The paper aims to analyze the performance of the first stage of AC–DC rectification in terms of output voltage ripple and voltage regulation when the loading conditions vary abruptly. In addition, this work investigates the basic uncontrolled and controlled rectification methods for low-power wind turbines. The role of the output capacitance and its effect on output voltage ripples is illustrated. Finally, the paper highlights the design of a three-phase controlled rectifier using a simple yet effective firing angle control of a silicon-controlled rectifier (SCR) device. The delay caused due to the firing angle variations is reported in the simulations and experimental results to support the conclusion drawn from this study. Full article
(This article belongs to the Special Issue Research and Development on DC-DC Power Converters)
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14 pages, 4829 KiB  
Article
Control and Design of a Boost-Based Electrolytic Capacitor-Less Single-Phase-Input Drive
by Alex Musetti, Hossein Sadegh Lafmejani and Alessandro Soldati
Energies 2022, 15(16), 5929; https://doi.org/10.3390/en15165929 - 16 Aug 2022
Cited by 2 | Viewed by 2005
Abstract
Adjustable-speed drives with single-phase input require a power factor correction front-end, usually implemented by a boost converter, to reduce the current distortion from the uncontrolled rectifier; this stage is then followed by a three-phase inverter. Bulky electrolytic capacitors are used to limit the [...] Read more.
Adjustable-speed drives with single-phase input require a power factor correction front-end, usually implemented by a boost converter, to reduce the current distortion from the uncontrolled rectifier; this stage is then followed by a three-phase inverter. Bulky electrolytic capacitors are used to limit the direct current voltage ripple resulting from the rectification of the single-phase input. This leads to increased system size and shorter lifetime. In this work, the usual boost front-end is exploited to actively control the DC link voltage ripple while limiting the input current distortion and, hence, the power factor, even if not reaching unity. However, Power Factor is greatly improved with respect to the uncontrolled rectifier alone. This approach permits one to reduce the required capacitance, allowing the substitution of the electrolytic capacitor with a long-life low-equivalent-series-resistance film one. A control targeting capacitor voltage level, ripple, and boost inductor peak current is presented, together with practical design models. The synergic control of the boost front-end and of the machine drive is presented as well. The resulting converter is tested with resistive load and permanent-magnet synchronous machine drive, highlighting the advantages and limits of the proposed solution. Full article
(This article belongs to the Special Issue High Performance Permanent Magnet Synchronous Motor Drives)
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21 pages, 2955 KiB  
Article
An Appropriate Index to Assess the Global Cancellation Level of the Harmonic Currents Consumed by a Set of Single-Phase Uncontrolled Rectifiers and a Set of Fluorescent Lamps
by Juan José Mesas, Luis Sainz, Lluís Monjo and Joaquín Pedra
Energies 2022, 15(12), 4315; https://doi.org/10.3390/en15124315 - 13 Jun 2022
Cited by 1 | Viewed by 1529
Abstract
An in-depth study of harmonic current reduction in European commercial buildings due to the harmonic cancellation effect when a set of single-phase uncontrolled rectifiers and a set of fluorescent lamps are connected at the same voltage level is essential, since both types of [...] Read more.
An in-depth study of harmonic current reduction in European commercial buildings due to the harmonic cancellation effect when a set of single-phase uncontrolled rectifiers and a set of fluorescent lamps are connected at the same voltage level is essential, since both types of non-linear loads are very present in commercial and residential sectors. This paper provides an appropriate index to assess the global cancellation level of the harmonic currents for this study. The equivalent circuit per phase of the typical three-phase power system of European commercial installations is presented and simplified for the cancellation analysis of the harmonic currents consumed by a set of multiple identical single-phase uncontrolled rectifiers and a set of multiple identical fluorescent lamps connected at the same voltage level. The suitability and usefulness of the proposed index are shown by applying it to that analysis, which leads to some results of practical interest. This index can be generalized to any number of sets of multiple identical non-linear loads and can be applied in graphical and optimization studies that will allow a greater benefit from the harmonic cancellation effect to be obtained given the global nature of the index. Full article
(This article belongs to the Special Issue Power Quality in the Modeling of Machines and Electrical Devices)
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