Detection algorithm of ultra-high harmonics in distribution networks

2021 ◽  
pp. 1-8
Author(s):  
Xin Shen ◽  
Hongchun Shu ◽  
Min Cao ◽  
Junbin Qian ◽  
Nan Pan
Keyword(s):  
New Technologies ◽  
Electricity Consumption ◽  
Distribution Networks ◽  
Detection Algorithm ◽  
High Order ◽  
High Order Harmonic ◽  
High Harmonics ◽  
Harmonic Analysis Method ◽  
The One ◽  
Effective Models

Power quality of distribution network is an emerging issue due to rapid increase in usage of non-linear loads on the one hand and utilization of sensitive devices on the other hand. Especially, harmonic emission is an important concern in both electric utilities and end users of electric power. Therefore, an accurate and rapid harmonic analysis method is of interest. New technologies have enabled the investigation of electricity consumption mode at an unprecedented scale and in multiple dimensions. However, an effective method that can capture the complexity of all the factors relevant to understanding a phenomenon such as ultrahigh harmonics (2–15 kHz). How to detect the super high order harmonic accurately has become the premise and foundation of the study of super high order harmonic. The key challenge in developing such approaches is the identification of effective models to provide a comprehensive and relevant systems view. An ideal method can identify super high harmonics and predict outcomes, by measured data across several dimensions variation. In this paper, the data integration, current methods and available implementation is discussed. Finally, the current challenges in integrative methods is discussed.

The research on active boost PFC

2020 ◽  
Vol 20 (3) ◽  
pp. 839-852
Author(s):  
Xuepeng Liu ◽  
Jianping Li
Keyword(s):  
Frequency Domain ◽  
Phase Angle ◽  
Power Factor ◽  
Time Domain ◽  
High Order ◽  
Wave Form ◽  
High Order Harmonic ◽  
Current Wave ◽  
The One

The current wave form of active boost PFC is simulated in time domain and frequency domain. With the voltage of 220 v, the inductance of 15 mH, the capacitance of 5040 μF, the load of 2500 W, the integrated power factor, fundamental power factor, and distortion are analyzed. The distortion is enhanced with the increase of frequency. Comparing high-order harmonic part under 10 mH and 15 Mh, it is demonstrated that the appropriate OFF phase angle changes with different requirement: the angle is 37 degree with distortion in least while the one is 34 degree with maximum integrated power factor. Topology and results are proposed. The results demonstrate that the power factor of real PFC circuit is up to 0.975.

scholarly journals Extended model for optimizing high-order harmonic generation in absorbing gases

2021 ◽  
Author(s):  
Balázs Major ◽  
Katalin Varju
Keyword(s):  
Harmonic Generation ◽  
Pressure Profile ◽  
High Order ◽  
Study Phase ◽  
Extended Model ◽  
High Order Harmonic Generation ◽  
Propagation Length ◽  
High Order Harmonic ◽  
The One ◽  
In The Beginning

Abstract We report on an extended version of the one-dimensional model proposed by Constant et al. [Phys. Rev. Lett 82(8), 1668 (1999)] to study phase matching of high-order harmonic generation in absorbing and dispersive medium. The model - expanded from zeroth to first order - can be used with media having a pressure profile varying linearly with propagation length. Based on the new formulas, the importance of having a generation medium that ends abruptly with a steep pressure gradient for achieving high flux is highlighted. In addition to further rule-of-thumb guidelines for harmonic-flux optimization, it is shown that having a steep increase of pressure in the beginning of the medium increases harmonic flux, while it also decreases the required medium length to reach the absorption-limited maximum.

Relativistic high-order harmonic generation

2003 ◽  
Vol 50 (3-4) ◽  
pp. 375-386
Author(s):  
D. B. MilosÕeviĆ ◽  
W. Becker
Keyword(s):  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

The Dilemma between Aligned Expectations and Diversity in Innovation

2018 ◽  
Author(s):  
Timur Ergen
Keyword(s):  
New Technologies ◽  
Historical Case ◽  
History Of Capitalism ◽  
Synthetic Fuel ◽  
The Us ◽  
History Of ◽  
The One ◽  
Technology Policies ◽  
Lock In ◽  
Innovation Processes

This chapter brings together arguments from economics, sociology, and political economy to show that innovation processes are characterized by a dilemma between the advantages of aligned expectations—including greater coordination and investment—and those of diversity, including superior openness to new technological possibilities. To illustrate the argument, the chapter discusses a historical case involving one of the largest coordinated peace-time attempts to hasten technological innovation in the history of capitalism, namely the US energy technology policies of the 1970s and 1980s. Close examination of the commercialization of photovoltaics and synthetic fuel initiatives illustrates both sides of the dilemma between shared versus diverse expectations in innovation: coordination but possible premature lock-in on the one hand, and openness but possible stagnation on the other. The chapter shows that even the exploration and interpretation of new technologies may be as much a product of focused investment as of trial-and-error search.

High order harmonic reflections from long pitch fibre grating

1998 ◽  
Vol 34 (1) ◽  
pp. 114
Author(s):  
Y. Chen ◽  
J. Palmer ◽  
P. Davis ◽  
L. Li
Keyword(s):  
High Order ◽  
High Order Harmonic
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