Cost-Efficient Control of a Common Distribution System With Non-Identical Warehouses

1998 ◽  
pp. 503-508
Author(s):  
Ulrich Tüshaus ◽  
Christoph Wahl
Keyword(s):  
Distribution System ◽  
Common Distribution ◽  
Efficient Control ◽  
Cost Efficient

scholarly journals Cluster Analysis of Distribution Grids in Baden-Württemberg

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4016 ◽  
Author(s):  
Tobias Rösch ◽  
Peter Treffinger
Keyword(s):  
Distribution System ◽  
Structural Characteristics ◽  
Peak Load ◽  
Distribution Grid ◽  
Development Data ◽  
Western Germany ◽  
Grid Construction ◽  
Cost Efficient ◽  
Regenerative Energy ◽  
Distribution Grids

With the growing share of renewable energies in the electricity supply, transmission and distribution grids have to be adapted. A profound understanding of the structural characteristics of distribution grids is essential to define suitable strategies for grid expansion. Many countries have a large number of distribution system operators (DSOs) whose standards vary widely, which contributes to coordination problems during peak load hours. This study contributes to targeted distribution grid development by classifying DSOs according to their remuneration requirement. To examine the amendment potential, structural and grid development data from 109 distribution grids in South-Western Germany, are collected, referring to publications of the respective DSOs. The resulting data base is assessed statistically to identify clusters of DSOs according to the fit of demographic requirements and grid-construction status and thus identify development needs to enable a broader use of regenerative energy resources. Three alternative algorithms are explored to manage this task. The study finds the novel Gauss-Newton algorithm optimal to analyse the fit of grid conditions to regional requirements and successfully identifies grids with remuneration needs. It is superior to the so far used K-Means algorithm. The method developed here is transferable to other areas for grid analysis and targeted, cost-efficient development.

scholarly journals Development of a Poisoned Bait Strategy against the Silverfish Ctenolepisma longicaudata (Escherich, 1905)

Insects ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 852
Author(s):  
Anders Aak ◽  
Morten Hage ◽  
Heidi Heggen Lindstedt ◽  
Bjørn Arne Rukke
Keyword(s):  
Field Experiments ◽  
Control Method ◽  
Initial Mixture ◽  
Mass Trapping ◽  
Safe Strategy ◽  
Efficient Control ◽  
Environmentally Safe ◽  
Safe Control ◽  
Cost Efficient ◽  
Spray Treatment

Pest management strives to be an efficient, yet healthy and environmentally safe control method, and the use of poisoned bait often fulfils these criteria. In the present study, we show that bait with indoxacarb as the active ingredient is highly efficient for controlling Ctenolepisma longicaudata (Escherich, 1905) and two of its relatives, Lepisma saccharina (Linnaeus, 1758) and Ctenolepisma calva (Ritter, 1910). Applying small bait droplets (size ~10 mg) along the walls of several types of buildings, at no more than 0.5 to 1.0 g bait per 100 m2, was a cost-efficient and safe strategy for the knockdown and eradication of C. longicaudata. During field experiments, the demography changed from an initial mixture of different stages to total dominance of early instars preceding the population collapse. Poisonous bait outcompeted mass-trapping with sticky-traps and conventional insect spray treatment for the efficient control of C. longicaudata in apartments. Different droplet densities (1 vs. 0.5/m2) and active ingredients (indoxacarb vs. clothianidin) did not have different effects in field experiments. These results show that poisoned bait is a highly relevant tool for managing C. longicaudata and potentially against other silverfish infestations.

An Improved of Multiple Harmonic Sources Identification in Distribution System with Inverter Loads by Using Spectrogram

2016 ◽  
Vol 7 (4) ◽  
pp. 1355
Author(s):  
M.H. Jopri ◽  
A.R. Abdullah ◽  
M. Manap ◽  
M.R. Yusoff ◽  
T. Sutikno ◽  
...  
Keyword(s):  
Significant Relationship ◽  
Distribution System ◽  
Correct Identification ◽  
Time Frequency ◽  
Sources Identification ◽  
Frequency Representation ◽  
Cost Efficient ◽  
Relationship Of ◽  
Accuracy Speed ◽  
Time Frequency Distribution

This paper introduces an improved of multiple harmonic sources identification that been produced by inverter loads in power system using time-frequency distribution (TFD) analysis which is spectrogram.  The spectrogram is a very applicable method to represent signals in time-frequency representation (TFR) and the main advantages of spectrogram are the accuracy, speed of the algorithm and use low memory size such that it can be computed rapidly. The identification of multiple harmonic sources is based on the significant relationship of spectral impedances which are the fundamental impedance (Z1) and harmonic impedance (Zh) that extracted from TFR. To verify the accuracy of the proposed method, MATLAB simulations carried out several unique cases with different harmonic producing loads on IEEE 4-bus test feeder cases. It is proven that the proposed method is superior with 100% correct identification of multiple harmonic sources. It is envisioned that the method is very accurate, fast and cost efficient to localize harmonic sources in distribution system.

scholarly journals An Improved Detection and Classification Technique of Harmonic Signals in Power Distribution by Utilizing Spectrogram

2017 ◽  
Vol 7 (1) ◽  
pp. 12
Author(s):  
M.H. Jopri ◽  
A.R. Abdullah ◽  
M. Manap ◽  
M.R. Yusoff ◽  
T. Sutikno ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Percent Correct ◽  
Time Frequency ◽  
Harmonic Signals ◽  
Classification Technique ◽  
Result Show ◽  
Cost Efficient ◽  
Rule Based Classifier

This paper introduces an improved detection and classification technique of harmonic signals in power distribution using time-frequency distribution (TFD) analysis which is spectrogram.  The spectrogram is an appropriate approach to signify signals in jointly time-frequency domain and known as time frequency representation (TFR). The spectral information of signals can be observed and estimated plainly from TFR due to identify the characteristics of the signals. Based on rule-based classifier and the threshold settings that referred to IEEE Standard 1159 2009, the detection and classification of harmonic signals for 100 unique signals consist of various characteristic of harmonics are carried out successfully. The accuracy of proposed method is examined by using MAPE and the result show that the technique provides high accuracy. In addition, spectrogram also gives 100 percent correct classification of harmonic signals. It is proven that the proposed method is accurate, fast and cost efficient for detecting and classifying harmonic signals in distribution system.

scholarly journals An Identification of Multiple Harmonic Sources in a Distribution System by Using Spectrogram

2018 ◽  
Vol 7 (2) ◽  
pp. 244-256
Author(s):  
M. H. Jopri ◽  
A. R. Abdullah ◽  
M. Manap ◽  
T. Sutikno ◽  
M. R. Ab Ghani
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Power Flow ◽  
Flow Direction ◽  
Correct Identification ◽  
Power Distribution System ◽  
Time Frequency ◽  
Frequency Representation ◽  
Identification Technique ◽  
Cost Efficient

The identification of multiple harmonic sources (MHS) is vital to identify the root causes and the mitigation technique for a harmonic disturbance. This paper introduces an identification technique of MHS in a power distribution system by using a time-frequency distribution (TFD) analysis known as a spectrogram. The spectrogram has advantages in term of its accuracy, a less complex algorithm, and use of low memory size compared to previous methods such as probabilistic and harmonic power flow direction. The identification of MHS is based on the significant relationship of spectral impedances, which are the fundamental impedance (Z1) and harmonic impedance (Zh) that estimate the time-frequency representation (TFR). To verify the performance of the proposed method, an IEEE test feeder with several different harmonic producing loads is simulated. It is shown that the suggested method is excellent with 100% correct identification of MHS. The method is accurate, fast and cost-efficient in the identification of MHS in power distribution arrangement.

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