Results 41 to 50 of about 1,002,790 (325)

A new method for harmonic impedance estimation [PDF]

2018 18th International Conference on Harmonics and Quality of Power (ICHQP), 2018
Determining the harmonic responsibilities of utility and customer side at a PCC has been a great concern in harmonic research, and utility harmonic impedance is a key factor for assessing harmonic emission levels. When background harmonic is unstable, traditional methods have a large error.
Fang-Wei Xu, Lu Wang, Jin-Shuai Zhao, Ying Chen, Lin Xu, Can Hu   +5 more
openaire   +1 more source

Islanding detection method of multi‐port photovoltaic DC micro grid based on harmonic impedance measurement

IET Renewable Power Generation, 2019
DC Grid does not transmit reactive power, nor does it offer frequency and phase issues. This results in malfunction of conventional islanding detection methods (IDMs) that rely on the above quantities.
Jia Ke, Zhu Zhengxuan, Zhao Qijuan, Yang Zhe, B. Tianshu   +4 more
semanticscholar   +1 more source

On the determination of the boundary impedance from the far field pattern

, 2009
We consider the Helmholtz equation in the half space and suggest two methods for determining the boundary impedance from knowledge of the far field pattern of the time-harmonic incident wave.
Godin, Yuri A., Vainberg, Boris
core   +1 more source

Frequency Dependent Specific Heat from Thermal Effusion in Spherical Geometry [PDF]

, 2010
We present a novel method of measuring the frequency dependent specific heat at the glass transition applied to 5-polyphenyl-4-ether. The method employs thermal waves effusing radially out from the surface of a spherical thermistor that acts as both a ...
Bo Jakobsen, G. Harrison, H. S. Carslaw, L. D. Landau, Niels Boye Olsen, T. Christensen, Tage Christensen   +6 more
core   +2 more sources

Utility harmonic impedance estimation based on time series clustering and improved Pettitt method

International Journal of Electrical Power & Energy Systems
Utility harmonic impedance estimation is critical for power quality assessment and improvement. Noninvasive methods without injecting harmonics are widely adopted to estimate utility harmonic impedance using natural load variations.
Wentao Li, Shunliang Wang, Hao Tu, Hong Miao, Ning Jiao, Tianqi Liu   +5 more
doaj   +1 more source

Wide-Band Harmonic Impedance Measurement Device for Wind Grid Based on Cascaded H-Bridge Converter

Zhongguo dianli, 2022
In wind power generation, the coupling of the wind farm power pooling system with the grid may cause high frequency resonance problems and affect the power quality of the grid.
Yongjun YU, Liguo XU, Zijie LIN, Binghan SUN, Qiujiang LIU, Zhensheng WU, Zhijie REN   +6 more
doaj   +1 more source

Impedance matching in photonic crystal microcavities for Second Harmonic Generation

, 2005
By numerically integrating the three-dimensional Maxwell equations in the time domain with reference to a dispersive quadratically nonlinear material, we study second harmonic generation in planar photonic crystal microresonators.
Andrea Di Falco, Armstrong, Ashkin, Berger, Boscolo, Claudio Conti, Di Falco, Di Falco, Franken, Gaetano Assanto, Ishihara, Joannopoulos, Jugessur, Martorell, Mingaleev, Mondia, Mookherjea, Sohler, Spillane, Srinivasan, Vuckovic, Xu   +21 more
core   +1 more source

Harmonic impedance estimation based on improved rank estimation

Journal of Physics: Conference Series
In response to the issue of harmonic data anomalies affecting harmonic impedance estimation, a method based on improved rank regression is proposed, building upon the foundation of rank estimation.
Dianlang Wang, Jing Chen, Qi Yin, Hanlin Ding, Qingsong Liu, Hong Miao   +5 more
semanticscholar   +1 more source

Optimal design of single-tuned passive filters using response surface methodology [PDF]

, 2015
This paper presents an approach based on Response Surface Methodology (RSM) to find the optimal parameters of the single-tuned passive filters for harmonic mitigation.
Abdel Aleem, SHE, Balci, ME, Karaoglan, AD, Sakar, S, Zobaa, AF   +4 more
core   +1 more source

A Composite Strategy for Harmonic Compensation in Standalone Inverter Based on Linear Active Disturbance Rejection Control

Energies, 2019
This paper proposes a harmonic compensation control with disturbance rejection function for a standalone inverter. Due to the LC type three-phase three-leg inverter is connected to nonlinear loads, low-order harmonic components appears in the inverter ...
Hui Li, Yue Qu, Junwei Lu, Shuang Li
doaj   +1 more source