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New perspectives for computer-aided discrimination of Parkinson's disease and essential tremor
Petra Povalej, J.A. Gallego, J. P. Romero, Vojko Glaser, E. Rocon, Julián Benito-León, Félix Bermejo-Pareja, Ignacio Posada, Aleš Holobar, 2017, original scientific article

Abstract: Pathological tremor is a common but highly complex movement disorder, affecting ~5% of population older than 65 years. Different methodologies have been proposed for its quantification. Nevertheless, the discrimination between Parkinson's disease tremor and essential tremor remains a daunting clinical challenge, greatly impacting patient treatment and basic research. Here, we propose and compare several movement-based and electromyography-based tremor quantification metrics. For the latter, we identified individual motor unit discharge patterns from high-density surface electromyograms and characterized the neural drive to a single muscle and how it relates to other affected muscles in 27 Parkinson's disease and 27 essential tremor patients. We also computed several metrics from the literature. The most discriminative metrics were the symmetry of the neural drive to muscles, motor unit synchronization, and the mean log power of the tremor harmonics in movement recordings. Noteworthily, the first two most discriminative metrics were proposed in this study. We then used decision tree modelling to find the most discriminative combinations of individual metrics, which increased the accuracy of tremor type discrimination to 94%. In summary, the proposed neural drive-based metrics were the most accurate at discriminating and characterizing the two most common pathological tremor types.
Keywords: Parkinson's disease, essential tremor, electromyography, wrist movements, motor units, muscular excitation, decision tree
Published: 03.11.2017; Views: 24; Downloads: 0
.pdf Full text (3,31 MB)

Implementation aspects of a BDD package supporting general decision diagrams
Robert Meolic, 2016, invited lecture at foreign university

Abstract: General decision diagram is a loose term for a superset of different types of decision diagrams - we are interested in joining BDDs, FDDs, and different types of suppressed DDs, e.g. ZBDDs. I will present: The current state of our BDD package Biddy (functionalities and details about the original implementation aspects). Our ideas for efficient implementation of ZBDDs (which could be used for all types of suppressed DDs).New type od decision diagrams called ZFDD (somehow symmetric to ZBDD). A rough draft about the implementation of a package supporting general decision diagrams.
Keywords: Binary Decision Diagram, Zero-suppressed Binary Decision Diagram, Boolean function, Algorithm, BDD package, Biddy
Published: 26.10.2017; Views: 34; Downloads: 3
.pdf Full text (1,07 MB)

The impact of wind-power generation on the planning of regulating reserve
Dunja Srpak, Boštjan Polajžer, 2017, original scientific article

Abstract: This paper presents new approach to the optimal distribution of the regulating reserve (RR) in a set of available regulating generation units. It is developed using evolutionary computation for the transmission-loss minimization and power-flow computation by applying the iterative method with a reactive power correction for voltage control. The approach involves the use of actual operating data directly from the network’s dispatch centre as well as daily and hourly plans of wind and load power for determining the RR requirements for the load frequency control (LFC). By testing the proposed approach on a case study, the possibility of implementing it on real power systems is demonstrated. The obtained results of the testing with actual data from the Croatian control area indicate substantial savings in ancillary service costs for the LFC and the considerable impact of different variations from the plan of each individual wind-power plant on the optimal RR distribution.
Keywords: evolutionary computation, frequency control, optimization, power systems, wind power generation
Published: 24.10.2017; Views: 29; Downloads: 0
.pdf Full text (1,52 MB)

Practicality of base load renewable generation in India
Karthik Subramanya Bhat, Udo Bachhiesl, published scientific conference contribution

Abstract: India, among several other countries globally, now faces a unique situation where managing the energy transition process without hurting the economic development becomes the highlight of its policies. The Indian power sector is highly carbon intensive, with coal based power providing 70% of the total electricity generated. Renewable energy occupies around 15% of the capacity mix. Energy access along with several other challenges, pose an obstacle to the needed transition to clean energy. As the seasonal load variations in India are not prominent, cheap coal based power supplies most of the load profile,while gas power plants are used for peak loads. The myth that renewable energy sources cannot meet baseload demand has become widely accepted and wide-spread, given their fluctuating nature. Several studies demonstrate an optimistic transition to 100% renewable sources might just be possible in the coming decades. In a carbon-rich power sector like India, the ‘base load’ mind set is a pretty big and powerful hurdle, as ensuring base load generation becomes a major issue with implications directly affecting the country’s economy. In this study, an effort has been made to discuss whether base load renewable generation in India is feasible, and the challenges involved.
Keywords: India, base load, renewable generation, energy transition, carbon intensive
Published: 11.10.2017; Views: 25; Downloads: 1
.pdf Full text (970,31 KB)

What is it worth?
Petra Gsodam, Heinrich Stigler, published scientific conference contribution

Abstract: High lifetimes and high capital intensities characterize fixed assets of electric utilities. The historical cost concept implicate that long-lasting fixed assets are shown too low in balance sheets of electric utilities: the real value of long-lasting assets is not shown because of nominal price increases. An alternative to show the real value of longterm assets represents the capital stock concept based on replacement values less depreciations (net capital stock). To calculate the capital stock, information regarding the level of investment in each power plant at the time of construction (historical acquisition values) and with regard to a common base year (replacement values) is necessary. This paper shows how the not-standardized investments in hydropower plants can be estimated and how the capital stock of run-of-river and threshold hydropower plants can be calculated. Long-term assets in the form of run-of-river and threshold hydropower plants are compared based on historic costs and replacement values. The paper concludes that given nominal price increases for replacement investments, as is the case with long-lasting hydropower plants, only depreciations based on replacement values can ensure preservation of the company’s assets.
Keywords: fixed assets, electric utilities, balance sheet, capital stock, depreciation
Published: 11.10.2017; Views: 25; Downloads: 1
.pdf Full text (1,51 MB)

Involving consumers in the programmes of consumption adjustment by using dynamic tariffing within the European Project Flex4Grid
Kristijan Koželj, Anton Kos, Damjan Bobek, published scientific conference contribution

Abstract: The distribution company Elektro Celje d.d. as a member of the International Consortium has successfully applied for the European Programme Tender on Research and Innovations Horizon 2020 with Flex4Grid project focusing on solutions that would allow flexibility management of users – the so-called prosumers of the distribution network in the field of consumption as well as power generation. Flex4Grid, a European Development Project, focuses primarily on the development of an open technological system for data management and service provision which would allow managing user or prosumer flexibility of the distribution network in respect of their power consumption as well as power generation. Prosumer flexibility is a capability of prosumers to adjust their consumption or power generation to the needs of other stakeholders within the system, and could be rewarded for such adjustment. The service will be offered in a computer cloud where anonymised data will be collected. Some new business models will be developed and some new incentives for prosumer participation in such projects will be introduced.
Keywords: Horizon 2020, Flex4Grid, data management, service provision, distribution networks
Published: 11.10.2017; Views: 41; Downloads: 2
.pdf Full text (376,67 KB)

Vključevanje odjemalcev v programe prilagajanja odjema z uporabo dinamičnega tarifiranja v sklopu Evropskega projekta Flex4Grid
Kristijan Koželj, Anton Kos, Damjan Bobek, published scientific conference contribution

Abstract: Podjetje Elektro Celje, d.d. je kot član mednarodnega konzorcija uspešno kandidiralo na razpisu evropskega programa za razvoj in inovacije Horizon 2020 s projektom Flex4Grid, ki se nanaša na rešitve, ki bodo omogočale upravljanje prožnosti uporabnikov tako pri porabi kakor tudi pri proizvodnji električne energije. Evropski razvojni projekt Flex4Grid se osredotoča na razvoj odprtega tehnološkega sistema za upravljanje podatkov in zagotavljanje storitev, ki bodo omogočale upravljanje prožnosti uporabnikov - prosumerjev distribucijskega omrežja tako pri porabi kakor tudi pri proizvodnji električne energije. Prožnost uporabnika pomeni, da je le-ta sposoben prilagajati porabo ali proizvodnjo potrebam drugih deležnikov v sistemu in bi lahko bil za svoje prilagajanje nagrajen. Storitev bo potekala v računalniškem oblaku, kjer bodo zbrani anonimizirani podatki. Razvili bomo nove poslovne modele in predstavili spodbude za sodelovanje odjemalcev v takšnih projektih.
Keywords: Horizont 2020, Flex4Grid, upravljanje podatkov, zagotavljanje storitev, distribucijsko omrežje
Published: 10.10.2017; Views: 19; Downloads: 1
.pdf Full text (495,77 KB)

Električna poljska jakost srednjenapetostnega podpornega izolatorja z različnim številom reber
Mirza Sarajlić, Peter Kitak, Nermin Sarajlić, Jože Pihler, published scientific conference contribution

Abstract: Članek obravnava modeliranje srednjenapetostnega podpornega izolatorja. V programskem orodju Matlab je izdelan model izolatorja, nato je izveden izračun električnega polja v programskem orodju Elefant. Poudarek je namenjen zunanji obliki izolatorja. V članku so prikazani primeri izolatorja z različnim številom reber in njihov vpliv na električno polje izolatorja.
Keywords: električna poljska jakost, srednja napetost, podporni izolator, elefant, matlab
Published: 10.10.2017; Views: 21; Downloads: 1
.pdf Full text (1,09 MB)

Algoritem za izračun napovedi trenutne moči sončne elektrarne s pomočjo nevronskih omrežij
Mihael Skornšek, Gorazd Štumberger, published scientific conference contribution

Abstract: Delo obravnava spremljanje in primerjavo obratovalnih lastnosti sončnih elektrarn. Vsa odstopanja v delovanju lahko spremljamo z dodatnimi meritvami na elektrarni, kot sta sončno obsevanje in temperatura celice. Na podlagi polletnih meritev parametrov delovanja je s pomočjo umetnega nevronskega omrežja v programskem paketu Matlab pripravljen algoritem za izračun napovedane moči sončne elektrarne v danem trenutku, s katerim lahko ovrednotimo pravilno delovanje le-te. Omenjeni algoritem predstavlja nadgradnjo sistema za spremljanje obratovanja sončne elektrarne. Večja razlika med izmerjenimi in z algoritmom določenimi trenutnimi izhodnimi močmi sončne elektrarne kaže na neustrezno delovanje posameznih elementov sončne elektrarne in potrebo po podrobnejšem preverjanju.
Keywords: algoritmi, napovedovanje, trenutna moč, sončne elektrarne, nevronsko omrežje
Published: 10.10.2017; Views: 22; Downloads: 1
.pdf Full text (704,58 KB)

Primer optimizacije obratovanja distribucijskega omrežja s prevezavami, obratovanjem v zanki in generiranjem jalove moči
Matej Pintarič, Miran Rošer, Gorazd Štumberger, published scientific conference contribution

Abstract: Članek obravnava problematiko povečevanja priključene moči odjema v omrežju, ki že obratuje blizu mejne obremenitve. Za določitev maksimalne še sprejemljive priključne moči so v optimizacijskem postopku ukrepi prevezav, obratovanja v zanki in generacije jalove moči. Vsi so analizirani s pomočjo programa za izračun pretokov energije. Delo prikazuje rezultate izračunov pretokov energije na obstoječem razdeljevalnem omrežju. Izveden je bil izračun maksimalne moči dveh industrijskih odjemalcev, ki želita povečati odjem, na podlagi maksimalne obremenitve omrežja brez upoštevanja razpršene proizvodnje v omrežju. Izvedena je tudi analiza delovanja omrežja v zaključeni zanki pri normalni obremenitvi in obremenitvi z maksimalno močjo. Podana je rešitev problema previsokih napetosti v omrežju ob preveliki generaciji moči razpršenega vira v omrežju.
Keywords: optimizacija, distribucijsko omrežje, prevezave, obratovanje v zanki, generiranje jalove moči
Published: 10.10.2017; Views: 19; Downloads: 2
.pdf Full text (455,29 KB)

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