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In recent years, the use of renewable energy carriers has been considerably increasing. The trend is associated mainly with the gradual depletion of reserves of fossil fuels and with problems of the impact of conventional power engineering on the environment, mostly connected with emissions of greenhouse gases. The paper presents statistical data on electricity generation from renewable energy sources...
The purpose of this paper is to present the LPV affine modeling of a Wind Energy Conversion System driven DFIG. It also deals with the analysis and the simulation of the established model. For that, starting from the system's electrical equations, we demonstrate the obtaining of the uncertain state space model of the DFIG. Then, we define a method that allows giving directly the variation range of...
This paper addresses the problem of discretization for uncertain linear systems with time-delay, uncertainty being of type bounded norm. Model is uncertain when the system modeling errors in the operating range controlled by the command are poorly known. A new approximated discretization method and digital design for control systems with time-delay are proposed. Numerical examples are given to demonstrate...
A new direct synthesis method for tuning the Pseudo-Derivative Feedback controller for integrating as well as stable or unstable first order processes with time delay is presented. The proposed control structure and tuning method ensure smooth closed-loop response to set-point changes, fast regulatory control and sufficient robustness against parametric uncertainty. Simulation results show that the...
The reverse logistics network design is gaining in importance because of environmental concerns and issues related to social corporate responsibility‥ To efficiently implement product recovery activity, a reverse logistics network is needed which can add value to the used products for the resale in new markets otherwise designing such a complex network would be unproductive. In this research, an approach...
C2C is an important part of E-commerce, even in the economic crisis it is still rapidly growing. However, compared with the traditional economy, the research on the network economy is still in its infancy. So this paper aims to C2C market to find consumer behavior rules. Differential pricing exists in C2C market, too. But the main reason is the uncertainty of product quality. Because different kinds...
The Smart Grid vision has been sparked by the need for a more reliable, efficient, and sustainable energy network. However, new technologies and new policies intended to realize this vision may increase significantly the complexity of the power network. In particular, with greater consumer and supplier choice, and with the introduction of renewable energy resources that are often unpredictable, the...
At most time, supply chain is a hybrid dynamic system composed of continuous material flow, discrete information flow and their interaction. Traditional method of modeling and simulation of supply chain looking supply chain as discrete event system can't reflect systemic dynamic complexity. In this paper, two kinds of order decision-making simulation model of supply chain, discrete model and discrete-continuous...
Water management arises in the context of social systems where human perceptions form the basis for problem definition. Actors construct various cognitive interpretations of the problem causes, and therefore, preferred solutions and responsibility attribution. Differences in interpretations may lead to conflicts, ambiguity, policy controversies and partial solutions. Thus, it is essential to share...
Risk management of engineering project is a complicated uncertainty problem. Based on the theory of set pair analysis (SPA), stochastic simulation of triangular fuzzy numbers, herein, a novel analysis model for the project risk management was discussed. A concept of multi-element connection number of the set pair was introduced to express the hierarchy and fuzziness of membership between the evaluation...
The objective of this study was to discuss the effects of spatial information on hydrologic simulation. WinVAST model was applied for hydrologic simulation. Synthetic watershed and scenario designs were discussed in this study. The result shows that both the accuracy of watershed delineation and the completeness of rainfall records can influence hydrologic simulations. Increase to delineation resolution...
The evaluation of economic efficiency of industrial enterprises is a comprehensive uncertainty system problem. Based on the theory of set pair analysis, stochastic simulation of triangular fuzzy numbers, a novel evaluation method for the economic efficiency of industrial enterprises was investigated in this paper. A concept of multi-element connection number of the set pair, which was consisted of...
Complex Logistics (CL) is a netlike logistics chain consisting of manufacturer entities, wholesaler entities and retailer entities. This paper describes a simulation tool, CLSim, developed for analyzing CL behavior and performance with uncertain customer demands which are described by imprecise natural language expressions and they are modeled in CLSim by fuzzy sets. Two types of models are combined...
This paper deals with the selection of the best of a finite set of systems, where best is defined with respect to the maximum mean simulated performance. We extend the ideas of the knowledge gradient, which accounts for the expected value of one stage of simulation, by accounting for the future value of the option to simulate over multiple stages. We extend recent work on the economics of simulation,...
The focus of the paper is on the long-term effects of the construction of a physical interconnection between SEE and Italy using a 1000-MW DC link from Italy to Albania. The impacts of this interconnection path are significant for the markets in Italy and SEE. The modeling issues are discussed and the simulation tool used to emulate the possible developments is presented. The use of scenario analysis...
This work reports real-time soft-error rate (SER) testing of semiconductor static memories in both altitude and underground environments to separate the component of the SER induced by the cosmic rays (i.e. primarily by atmospheric neutrons) from that caused by on-chip radioactive impurities (alpha-particle emitters). Two European dedicated sites were used to perform long-term real-time measurements...
For application researches of the detection for the gas signal source, a method for orientation estimation of the gas signal source in the two-dimensional space and its algorithm are presented in the paper. In the method, a mode of dual-line gas sensor array is applied to sample the signals of the gas concentration in real time, and the time delay estimation, an approach of the signal processing,...
This paper deals with the identification and robust control of a biological wastewater treatment process. The identification has been done on the basis of the minimization of an Euclidian-distance criterion, with respect to the model coefficients. The robust control of the biological wastewater treatment process has been accomplished through QFT (quantitative feedback theory) techniques. To this end...
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