The high proliferation of converter-dominated Distributed Renewable Energy Sources (DRESs) at the distribution grid level has gradually replaced conventional synchronous generators (SGs) transmission system, resulting in emerging stability and security challenges. inherent characteristics SGs are currently used for providing ancillary services (ASs), following instructions Transmission System Operator, while DRESs obliged to offer specific system support functions, without being remunerated...

The continuous penetration of renewable energy resources (RES) into the mix and transition traditional electric grid towards a more intelligent, flexible interactive system, has brought electrical load forecasting to foreground smart planning operation. Predicting is challenging task due its high volatility uncertainty, either when it refers distribution system or single household. In this paper, novel methodology introduced which leverages advantages state-of-the-art deep learning...

In this work we propose a new hybrid model, combination of the manifold learning Principal Components (PC) technique and traditional multiple regression (PC-regression), for short medium-term forecasting daily, aggregated, day-ahead, electricity system-wide load in Greek Electricity Market period 2004–2014. PC-regression is shown to effectively capture intraday, intraweek annual patterns load. We compare our model with number classical statistical approaches (Holt-Winters exponential...

In recent years there has been an increasing number of papers in the literature, applying methods and techniques Nonlinear Dynamics to time series electrical activity normal electrocardiograms (ECGs) various human subjects. Most these studies are based primarily on correlation dimension estimates, conclude that dynamics ECG signal is deterministic occurs a chaotic attractor, whose can distinguish between healthy severely malfunctioning cases. this paper, we first demonstrate calculations...

The increasing penetration of variable renewable energy (VRE) sources into the electrical grid poses significant challenges for balancing power system supply and demand. In order to cope with these challenges, flexibility is needed. Therefore, operators need evaluate plan ahead adequacy their systems in ensure reliable operation under high VRE penetration. this context, we present a suitable high-level assessment study applied on real system, namely Greek that based actual data can provide...

The extent to which daily return data from the Athens' Stock Exchange Index exhibits non-linear and chaotic characteristics is investigated by employing multiple tests both Economics' Natural Sciences' fields. BDS test Rescale Range (R/S) analysis provide evidence for non-linearity fractality due noisy chaos, respectively, while methods of dynamics, like correlation dimension related tests, as well as, Lyapunov exponents, give consistent results, do not rule out possibility deterministic...

We study the co-evolution of dynamics or co-movement two electricity markets, Italian and Greek, by studying their wholesale day-ahead prices, simultaneously in time-frequency domain. Co-movement is alternatively referred as market integration financial economics markets are internationally integrated if reward for risk identical regardless one trades in. The innovation this work application wavelet analysis more specifically coherence to estimate dynamic interaction between these prices....

In this paper we examine and compare the efficiency of four European electricity markets (NordPool, Italian, Spanish Greek) different microstructure level maturity, by testing weak form Efficient Market Hypothesis (EMH). To quantify deviation each market from ‘ideal’ or ‘benchmark random walk’, have constructed a Composite Electricity Efficiency Index (EMEI), inspired similar works on other energy commodities. The proposed index consists linear nonlinear components one measuring feature...

Anorexia nervosa is associated with impaired cognitive flexibility and central coherence, i.e., the ability to provide an overview of complex information. Therefore, aim present study was evaluate EEG features elicited from patients anorexia healthy controls during mental tasks (valid invalid Aristotelian syllogisms paradoxes). Particularly, we examined combination most significant selected (relative power time–frequency domain wavelet-estimated EEG-specific waves, Higuchi fractal dimension...

Increasing the generation of electric power from renewable energy sources (RESs) creates important challenges to transmission system operators (TSOs) for balancing system. To address these challenges, adequate flexibility is required. In this context, TSOs carry out assessment studies evaluate level and ensure that a stable operation under high RESs integration can be achieved. These take into consideration numerous scenarios incorporating different assumptions temperature, penetration, load...

We aim to investigate whether EEG dynamics differ in adults with ASD (Autism Spectrum Disorders), ADHD (attention-deficit/hyperactivity disorder), compared healthy subjects during the performance of an innovative cognitive task: Aristotle's valid and invalid syllogisms. follow Neuroanatomical differences type criterion assessing results our study supporting or not dual-process theory Kahneman, 2011) (Systems I & II thinking).We recorded EEGs from 14 scalp electrodes 30 ADHD, 24 healthy,...

A chaotic analysis approach was applied to an earthquake time series recorded in the Japanese area order test assumption that process could be manifestation of a low dimensional process. For study seismicity we have used consisting differences between two consecutive seismic events with magnitudes greater than 2.6. The results our show underlying mechanism, as expressed by series, can described dynamics. power spectrum shows law profile slopes, α=1.4 frequency and α=0.05 high regions, while...

The European Commission’s Target Model’s main objective is to integrate electricity markets, leading a single internal energy market and guaranteeing the instantaneous balance between generation demand. According target model for trading, proposed by Network Transmission System Operators Electricity (ENTSO-E), within each zone, can be traded freely without taking into consideration network limitations. In contrast, cross-border exchanges with other areas are taken account. Cross-border trade...

Italy, Greece, and, to a lesser degree, Bulgaria have experienced fast growth in their renewable generation capacity (RESc) over the last several years. The consequences of this fact include decrease spot wholesale prices electricity markets and significant effect on cross border trading (CBT) among neighboring interconnected countries. In work, we empirically analyzed historical data fundamental market variables (i.e., prices, load, RES generation) as well CBT (imports, exports, commercial...

We aim to investigate whether EEG dynamics differ in adults with ASD (Autism Spectrum Disorders) and ADHD (attention-deficit/hyperactivity disorder) compared healthy subjects during the performance of an innovative cognitive task, Aristotle’s valid invalid syllogisms, how these differences correlate brain regions behavioral data for each subject. recorded EEGs from 14 scalp electrodes (channels) 21 ADHD, ASD, healthy, normal subjects. The were exposed a set tasks (inducing varying loads),...

Energy market gradual integration across Europe led to increased interest on cross-border trading. Cross-border trade leads additional stress the interconnection lines, resulting in increasing network congestion, which turn restricts electricity Thus, calculating available capacity for is of great importance market. Today, Available Transfer Capacity (ATC) mechanism dominates, but this methodology sounds be replaced by Flow-Based (FB) approach Europe. This paper investigates congestion...

This paper primarily aims to demonstrate how TSO, and DSO shall act in a coordinated manner procure, activate innovative flexibility services reliable, efficient way. The objective of this is the financial, system reliability benefits TSO can exhibit by leveraging flexibility, under different coordination frameworks between operators, order alleviate overvoltages caused Ferranti effect. For purpose, service-oriented market introduced. A case study from Greek power used conduct cost-benefit...