The Experts below are selected from a list of 17634 Experts worldwide ranked by ideXlab platform
Alex Stojcevski - One of the best experts on this subject based on the ideXlab platform.
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Design and Implementation of a Hybrid Single T-Type Double H-Bridge Multilevel Inverter (STDH-MLI) Topology
Energies, 2019Co-Authors: Muhyaddin Rawa, Marif Daula Siddique, Saad Mekhilef, Noraisyah Mohamed Shah, Hussain Bassi, Mehdi Seyedmahmoudian, Ben Horan, Alex StojcevskiAbstract:Multilevel inverters are proficient in achieving a high-quality staircase output Voltage Waveform with a lower amount of harmonic content. In this paper, a new hybrid multilevel inverter topology based on the T-type and H-bridge module is presented. The proposed topology aims to achieve a higher number of levels utilizing a lower number of switches, direct current (dc) Voltage sources, and Voltage stresses across different switches. The basic unit of the proposed single T-type and double H-bridge multilevel inverter (STDH-MLI) produces 15 levels at the output using three dc Voltage sources. The proposed topology can be extended by connecting a larger number of dc Voltage sources in the T-type section. The nearest level control (NLC) switching technique is used to generate gate pulses for switches to achieve a high-quality output Voltage Waveform. In addition, a simplified way to achieve NLC is also described in the paper. A detailed comparison with other similar topologies is provided to set the benchmark of the proposed topology. Finally, experimental work is carried out to validate the performance of the proposed topology.
Muhyaddin Rawa - One of the best experts on this subject based on the ideXlab platform.
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Design and Implementation of a Hybrid Single T-Type Double H-Bridge Multilevel Inverter (STDH-MLI) Topology
Energies, 2019Co-Authors: Muhyaddin Rawa, Marif Daula Siddique, Saad Mekhilef, Noraisyah Mohamed Shah, Hussain Bassi, Mehdi Seyedmahmoudian, Ben Horan, Alex StojcevskiAbstract:Multilevel inverters are proficient in achieving a high-quality staircase output Voltage Waveform with a lower amount of harmonic content. In this paper, a new hybrid multilevel inverter topology based on the T-type and H-bridge module is presented. The proposed topology aims to achieve a higher number of levels utilizing a lower number of switches, direct current (dc) Voltage sources, and Voltage stresses across different switches. The basic unit of the proposed single T-type and double H-bridge multilevel inverter (STDH-MLI) produces 15 levels at the output using three dc Voltage sources. The proposed topology can be extended by connecting a larger number of dc Voltage sources in the T-type section. The nearest level control (NLC) switching technique is used to generate gate pulses for switches to achieve a high-quality output Voltage Waveform. In addition, a simplified way to achieve NLC is also described in the paper. A detailed comparison with other similar topologies is provided to set the benchmark of the proposed topology. Finally, experimental work is carried out to validate the performance of the proposed topology.
John N. Chiasson - One of the best experts on this subject based on the ideXlab platform.
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Reduced Switching-Frequency Active Harmonic Elimination for Multilevel Converters
IEEE Transactions on Industrial Electronics, 2008Co-Authors: Zhong Du, Laren M. Tolbert, John N. Chiasson, Burak OzpineciAbstract:This paper presents a reduced switching-frequency active-harmonic-elimination method (RAHEM) to eliminate any number of specific order harmonics of multilevel converters. First, resultant theory is applied to transcendental equations to eliminate low-order harmonics and to determine switching angles for a fundamental frequency-switching scheme. Next, based on the number of harmonics to be eliminated, Newton climbing method is applied to transcendental equations to eliminate high-order harmonics and to determine switching angles for the fundamental frequency-switching scheme. Third, the magnitudes and phases of the residual lower order harmonics are computed, generated, and subtracted from the original Voltage Waveform to eliminate these low-order harmonics. Compared to the active-harmonic-elimination method (AHEM), which generates square waves to cancel high-order harmonics, RAHEM has lower switching frequency. The simulation results show that the method can effectively eliminate all the specific harmonics, and a low total harmonic distortion (THD) near sine wave is produced. An experimental 11-level H-bridge multilevel converter with a field-programmable gate-array controller is employed to experimentally validate the method. The experimental results show that RAHEM does effectively eliminate any number of specific harmonics, and the output Voltage Waveform has low switching frequency and low THD.
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active harmonic elimination for multilevel converters
IEEE Transactions on Power Electronics, 2006Co-Authors: Laren M. Tolbert, John N. ChiassonAbstract:This paper presents an active harmonic elimination method to eliminate any number of specific higher order harmonics of multilevel converters with equal or unequal dc Voltages. First, resultant theory is applied to transcendental equations characterizing the harmonic content to eliminate low order harmonics and to determine switching angles for the fundamental frequency switching scheme and a unipolar switching scheme. Next, the residual higher order harmonics are computed and subtracted from the original Voltage Waveform to eliminate them. The simulation results show that the method can effectively eliminate the specific harmonics, and a low total harmonic distortion (THD) near sine wave is produced. An experimental 11-level H-bridge multilevel converter with a field programmable gate array controller is employed to implement the method. The experimental results show that the method does effectively eliminate any number of specific harmonics, and the output Voltage Waveform has low THD.
Steven B Leeb - One of the best experts on this subject based on the ideXlab platform.
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Voltage Waveform transient identification for autonomous load coordination
IEEE Access, 2019Co-Authors: Spencer C Shabshab, Peter Lindahl, Kendall Nowocin, Steven B LeebAbstract:Significant electrical loads such as HVAC systems can be made “aware” of the operation of other loads nearby in the electric grid. Local examination of the utility Voltage Waveform can provide this awareness without the need for a dedicated communication network. This is particularly true in low-inertia microgrids and “soft” sections of a utility network. This paper presents techniques for extracting frequency and Voltage harmonic transients corresponding to individual load events. With data collected from a microgrid energized by diesel generators, we demonstrate the ability to identify the operation of HVAC units and generator dispatch events from their transient effects on the Voltage using a cross-correlation based scoring algorithm. Ultimately, incorporating such awareness into load controllers allows loads to autonomously meet system-level objectives in addition to their individual requirements. For example, HVAC units could maintain occupant comfort while also reducing the utility’s peak aggregate electrical demand by consuming electricity on a schedule interleaved with the operation of other nearby HVAC units.
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transient event detection for nonintrusive load monitoring and demand side management using Voltage distortion
Applied Power Electronics Conference, 2006Co-Authors: Robert W Cox, Steven B Leeb, Steven R Shaw, L.k. NorfordAbstract:This paper describes a simple system that can be used for autonomous demand-side management in a load site such as a home or commercial facility. The system identifies the operation of individual loads using transient patterns observed in the Voltage Waveform measured at an electric service outlet. The theoretical foundation of the measurement process is introduced, and a preprocessor that computes short-time estimates of the spectral content of the Voltage Waveform is described. The paper presents several example measurements demonstrating the ability of the system to obtain estimates of the spectral content of the Voltage Waveform.
Noraisyah Mohamed Shah - One of the best experts on this subject based on the ideXlab platform.
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Design and Implementation of a Hybrid Single T-Type Double H-Bridge Multilevel Inverter (STDH-MLI) Topology
Energies, 2019Co-Authors: Muhyaddin Rawa, Marif Daula Siddique, Saad Mekhilef, Noraisyah Mohamed Shah, Hussain Bassi, Mehdi Seyedmahmoudian, Ben Horan, Alex StojcevskiAbstract:Multilevel inverters are proficient in achieving a high-quality staircase output Voltage Waveform with a lower amount of harmonic content. In this paper, a new hybrid multilevel inverter topology based on the T-type and H-bridge module is presented. The proposed topology aims to achieve a higher number of levels utilizing a lower number of switches, direct current (dc) Voltage sources, and Voltage stresses across different switches. The basic unit of the proposed single T-type and double H-bridge multilevel inverter (STDH-MLI) produces 15 levels at the output using three dc Voltage sources. The proposed topology can be extended by connecting a larger number of dc Voltage sources in the T-type section. The nearest level control (NLC) switching technique is used to generate gate pulses for switches to achieve a high-quality output Voltage Waveform. In addition, a simplified way to achieve NLC is also described in the paper. A detailed comparison with other similar topologies is provided to set the benchmark of the proposed topology. Finally, experimental work is carried out to validate the performance of the proposed topology.
