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High-harmonic diffractive lens color compensation
Applied Optics, 2021Large diameter, high-harmonic diffractive lenses could find applications in future space telescopes. Residual chromatic aberrations from these lenses can cause significant blurring. Solutions to reduce chromatic dispersion and other aberrations to diffraction-limited performance are discussed. A design example based on a 240-mm-
Zichan, Wang +2 more
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Adaptive harmonic blocking compensator
IEEE Transactions on Power Delivery, 2003Properties of a compensator with adaptive balancing and harmonic blocking features for correcting the power factor of the load, balancing an unbalanced load, and reducing the waveform distortion caused by harmonic generating loads are presented in the paper.
null Shih-Min Hsu, L.S. Czarnecki
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Decentralized Compensation of Harmonics
EPE Journal, 1993Caused by the increasing use of dc power supplies based on rectifiers with capacitive smoothing, Fig. 1, the harmonic voltage levels are continuously rising in public mains systems.
R. Gretsch, W. Gunselmann
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Proceedings of the IEEE International Conference on Industrial Technology (ICIT'96), 2002
New compensation method of specific number harmonics currents is proposed and its excellent compensation effects are explained in comparison with conventional versatile compensation. In addition, preference compensation of specific number harmonics currents is also proposed and experimental data with a small model proves the superiority of this method.
M. Yano, S. Kuramochi, N. Nanaumi
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New compensation method of specific number harmonics currents is proposed and its excellent compensation effects are explained in comparison with conventional versatile compensation. In addition, preference compensation of specific number harmonics currents is also proposed and experimental data with a small model proves the superiority of this method.
M. Yano, S. Kuramochi, N. Nanaumi
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Dead-time compensation strategy with adaptive harmonic compensator
2014 International Conference on Applied Electronics, 2014This paper aims at compensating the dead-time effects in the vector-controlled induction motor system. It is used a feed-forward approach for the fundamental compensation and a feedback loop with adaptive GM filter and PI controllers for a harmonic compensation. The simulation results demonstrate the effectiveness of the proposed compensation strategy.
Buchta Ludek, Pohl Lukas
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Harmonic blocking compensator: Frequency properties
European Transactions on Electrical Power, 1998AbstractResonant harmonic filters (RHF) commonly used for reducing waveform distortion in distribution systems have a number of disadvantages. Their effectiveness degrades with an increase in the distortion of the distribution voltage. The current harmonics other than those to which the filter is tuned can be amplified.
S.‐M. Hsu, L. S. Czarneeki
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A Current Reference Compensation Scheme for Second Harmonic Current Compensator
2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia), 2020The instantaneous output power of the two-stage single-phase inverter pulsates at twice the output voltage frequency. The second harmonic current compensator (SHCC) can eliminate the influence of the second harmonic current (SHC) in the front-end dc-dc converter and input dc source.
Hao Dang, Xinbo Ruan
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CURRENT HARMONIC COMPENSATION USING PREDICTIVE CONTROLLERS
Journal of Circuits, Systems and Computers, 2004The power quality has become a major concern since late 1980's. There has been increasing interest in studying power quality problems, one of which is the existence of the current/voltage harmonics. In order to eliminate these harmonics, different methods have so far been proposed and developed.
MOHAMMAD HAERI, KAMIAR KORDARI
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Selective harmonics compensator
International School on Nonsinusoidal Currents and Compensation 2013 (ISNCC 2013), 2013An algorithm for selective harmonics compensator is presented in this paper. The algorithm is based on moving discrete Fourier transformation. The correctness of the algorithm has been confirmed by simulation studies. The paper includes current waveforms and their spectra of three-phase compensator.
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Instantaneous line voltage controlled harmonics compensator
2000 26th Annual Conference of the IEEE Industrial Electronics Society. IECON 2000. 2000 IEEE International Conference on Industrial Electronics, Control and Instrumentation. 21st Century Technologies and Industrial Opportunities (Cat. No.00CH37141), 2002We propose a line voltage harmonic compensator for the distribution line voltage distortion and the nonlinear load harmonic current by using a simple shunt active filter with series inductances. The instantaneous terminal voltages of the common supply line are controlled to the sinusoidal waveforms by the instantaneous compensation current.
T. Ohnishi, M. Hojo, N. Matsui
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