The Experts below are selected from a list of 33894 Experts worldwide ranked by ideXlab platform
Jiajun Bai - One of the best experts on this subject based on the ideXlab platform.
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design of absorptive transmissive frequency selective surface based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
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Design of Absorptive/Transmissive Frequency-Selective Surface Based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
Mohd Hasan Ali - One of the best experts on this subject based on the ideXlab platform.
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Lyapunov Function Controlled Parallel Resonance Fault Current Limiter for Transient Stability Enhancement of Power System
2018 North American Power Symposium (NAPS), 2018Co-Authors: Mohammad Ashraf Hossain Sadi, Mohd Hasan AliAbstract:In this paper, a Lyapunov function control based Parallel Resonance type fault current limiter (PRFCL) is proposed to enhance the transient stability of the multimachine power system. The proposed controller is unique in the sense that it offers global stability, voltage and current feedbacks in the controller loops. The performance of the proposed Lyapunov function controlled PRFCL is compared with that of a previously proposed static nonlinear controlled PRFCL. The detailed controller design, analysis, and stability investigations are carried out for the IEEE 39 bus power system by the MATLAB/SIMULINK environment. From the simulation results and different quantifying parameters, it has been deduced that the proposed Lyapunov function controlled PRFCL is effective in improving the transient stability of the power system, and also it performs better than the static nonlinear controlled PRFCL.
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Fault ride through capability improvement of DFIG based wind farm by fuzzy logic controlled Parallel Resonance fault current limiter
Electric Power Systems Research, 2017Co-Authors: Gilmanur Rashid, Mohd Hasan AliAbstract:Abstract Doubly fed induction generator (DFIG) based wind farms offer some distinct advantages, but their vulnerable nature to grid fault is problematic for the stable operation of power systems with higher wind power penetration. Fault ride through (FRT) capability is a requirement imposed through the grid codes to ensure stable power system operation. A fuzzy logic controlled Parallel Resonance fault current limiter (FLC-PRFCL) is proposed to aid the DFIG based wind farms to achieve improved FRT capability. To check the effectiveness of the proposed FLC-PRFCL, temporary symmetric and asymmetric faults were applied to the multi-machine system, to which a DFIG based wind farm is connected. The performance of the proposed FLC-PRFCL was compared with that of the crowbar, the bridge-type fault current limiter (BFCL) and conventional proportional-integral (PI) control based PRFCL (PI-PRFCL). Simulations were performed using the Matlab/Simulink software. It was found that the proposed FLC-PRFCL is an effective device for FRT capability improvement of the DFIG based wind farm. Moreover, the proposed FLC-PRFCL outperforms the crowbar, the BFCL, and the PI-PRFCL.
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transient stability augmentation of pv dfig sg based hybrid power system by Parallel Resonance bridge fault current limiter
Electric Power Systems Research, 2016Co-Authors: Md Kamal Hossain, Mohd Hasan AliAbstract:Abstract This paper proposes a Parallel-Resonance bridge type fault current limiter (PRBFCL) to augment the transient stability of a hybrid power system consisting of a photovoltaic (PV) power generation source, a doubly-fed induction generator (DFIG)-based wind energy system, and a synchronous generator (SG). The PRBFCL is designed such a way that it can provide sufficient damping characteristics to the studied power system. The effectiveness of the proposed PRBFCL in improving the transient stability and enhancing the dynamic performance of the hybrid power system is verified by applying both balanced and unbalanced faults in the power network. Also, its performance is compared with that of the bridge type fault current limiter (BFCL) and the fault ride through (FRT) schemes, i.e. FRT schemes of PV, DFIG, and with the AVR and governor of synchronous generator (SG). Some indexes are used to quantify the system performance. Simulation results obtained from the Matlab/Simulink software show that the proposed PRBFCL is effective in maintaining stable operation of the PV, wind generator, and synchronous generator during the grid fault. Moreover, the performance of the PRBFCL is better than that of the BFCL and the FRT methods in every aspect.
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Asymmetrical fault ride through capacity augmentation of DFIG based wind farms by Parallel Resonance fault current limiter
2016 IEEE Power and Energy Society General Meeting (PESGM), 2016Co-Authors: Gilmanur Rashid, Mohd Hasan AliAbstract:Doubly fed induction generator (DFIG) based wind farms faces challenge to maintain fault ride through (FRT) as they are vulnerable to the grid faults. The asymmetrical faults are also problematic like the symmetrical faults, as the asymmetrical faults introduce electromechanical stress on turbine generator systems and may cause grid code violation. To augment the asymmetrical FRT capacity and handle the asymmetrical faults, a Parallel Resonance fault current limiter (PRFCL) is proposed. To check the effectiveness of the proposed PRFCL, double-line-to-ground (2LG), line-to-line (2L) and single-line-to-ground (1LG) faults were applied to the multi-machine power system where the DFIG based wind farm is connected. Performance of the PRFCL is compared with that of the bridge-type fault current limiter (BFCL). Simulations executed in Matlab/Simulink show that the PRFCL is a very effective auxiliary device to augment the asymmetrical FRT capacity and outperforms the BFCL.
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Application of Parallel Resonance fault current limiter for fault ride through capability augmentation of DFIG based wind farm
2016 IEEE PES Transmission and Distribution Conference and Exposition (T&D), 2016Co-Authors: Gilmanur Rashid, Mohd Hasan AliAbstract:Doubly fed induction generator (DFIG) based wind generators are vulnerable to the grid faults, as their stator windings are directly connected to the grid. Fault ride through (FRT) capability of a wind farm is very important, as it is a common requirement by the grid codes practiced all over the world. In this work, to enhance the FRT capability of a DFIG based wind farm, the Parallel Resonance fault current limiter (PRFCL) is proposed. To check the effectiveness of the proposed PRFCL, its performance is compared with that of the bridge-type fault current limiter (BFCL). A three-phase-to-ground (3LG) fault was applied to one of the double circuit transmission lines at the wind farm connection point of the multi-machine system to investigate the FRT capability. Simulations were carried out in Matlab/Simulink environment. Simulation results show that the PRFCL is a very effective auxiliary device to achieve better FRT. Moreover, it was found that the PRFCL outperforms the BFCL.
Qiang Chen - One of the best experts on this subject based on the ideXlab platform.
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design of absorptive transmissive frequency selective surface based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
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Design of Absorptive/Transmissive Frequency-Selective Surface Based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
Shilin Yang - One of the best experts on this subject based on the ideXlab platform.
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design of absorptive transmissive frequency selective surface based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
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Design of Absorptive/Transmissive Frequency-Selective Surface Based on Parallel Resonance
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Qiang Chen, Shilin Yang, Jiajun BaiAbstract:This communication presents a novel frequency-selective surface (FSS) with high in-band transmission at high frequency and wideband absorption at low frequency. It consists of a resistive sheet and a metallic bandpass FSS separated by a foam spacer. The resistive element is realized by inserting a strip-type Parallel $LC$ (PLC) structure into the center of a lumped-resistor-loaded metallic dipole. The PLC resonates at the passband of the bandpass FSS and exhibits an infinite impedance, which splits the resistive dipole into two short sections per the surface current; this setup allows for high in-band transmission at high frequency. Below the Resonance frequency, the PLC becomes finite inductive and the entire FSS performs as an absorber with the metallic FSS as a ground plane. The surface current distribution on the resistive element can be controlled at various frequencies via the PLC structure. The wideband absorption and high in-band transmission of the proposed design are verified by both numerical simulation and experimental measurements. The potential extension to polarization-insensitive designs is also discussed.
Ying Cheng - One of the best experts on this subject based on the ideXlab platform.
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Series and Parallel Resonance Problem of Wideband Frequency Harmonic and Its Elimination Strategy
IEEE Transactions on Power Electronics, 2014Co-Authors: Zhikang Shuai, Chunming Tu, John Shen, Ying ChengAbstract:The extensive use of pulse width modulation control technology in smart grid will lead to prominent enlargement of high-frequency harmonics. The effects of the distributed capacitances of transmission line and transformer that are neglected previously will be very obvious. The performance of the traditional harmonic eliminating method for wideband harmonic is limited, which will lead to huge challenge to the analysis, evaluation, and elimination of harmonics as well as series and Parallel Resonance problem. In this paper, to accurately describe the influence of wideband harmonic on smart grid, the multiterminal analysis model of harmonic degradation in smart grid is established, especially the distributed capacitances of the transmission line and the transformer are considered. Then, a novel topology of hybrid active power filter (HAPF) for Resonance damping and multitype harmonic eliminating is proposed. The Resonance damping model of the new topology is established; analysis results indicate that the proposed HAPF has a good harmonic Resonance damping characteristic. Both simulation and experimental results have validated the validity of the theoretical analysis in this paper.
