This paper proposes a combined power quality-optimal control of the three-phase grid connected power converter. By using the technique of decoupling control, the mathematical model of the three-phase power converter i...
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This paper proposes a combined power quality-optimal control of the three-phase grid connected power converter. By using the technique of decoupling control, the mathematical model of the three-phase power converter is developed in the dq rotating reference frame and it is linearized around the operating point. The optimal control problem is with free-end point, infinite time horizon, and without constraints. The proposed optimal control is obtained as a solution of the Algebraic Riccati Equation. The numerical simulations based on the Matlab/Simulink software show the validity of the proposed solution.
The concept of Low Density Parity Check (LDPC) coding over Galois Fields GF (q = 2 p ) is a generalization of the industry standard binary LDPC coding. The performance for short block length codes is significantly hig...
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The concept of Low Density Parity Check (LDPC) coding over Galois Fields GF (q = 2 p ) is a generalization of the industry standard binary LDPC coding. The performance for short block length codes is significantly higher for non-binary codes (over higher order GF fields), but on the other hand, the decoding complexity is increased. Therefore the hardware implementation of a decoder is still a challenging task. Most of the few implementations known from the literature use multiplierless computing units. In this article we present a different approach that does not exclude multiplier blocks from the decoder module. This approach is specifically intended for FPGA (Field Programmable Gate Array) implementation. We propose the decoding algorithm formulation that uses multiplications in the computation step of the Check Nodes and summations performed in the Bit Nodes. The main reason is to enable mapping a part of the algorithm to the multiplier cores available in the FPGA devices. In the article we present the decoder structure that has been developed and the construction of its building blocks. We also provide synthesis results for the Xilinx FPGAs and simulation results for a simple BPSK (Binary Phase Shift Keying) modulation model over AWGN (Additive White Gaussian Noise) channel.
This paper deals with human action classification by utilizing spatio-temporal (ST) co-occurrences between labels of video-words that are stored within ST correlo-grams. Mutual information based clustering method is e...
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Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the couplin...
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Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the coupling process acoustic emission signals are generated by: the mechanical setup of tap changer, contacts operation, and other phenomena. For most on load tap changers types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register acoustic emission signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. Acoustic emission signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of acoustic emission signals generated by on load tap changers working under laboratory conditions, with applied measuring transducers with different transmittances, is presented in the paper. The comparative analysis was performed in order to determine their suitability for on load tap changers technical condition diagnosis. Based on the results achieved, one transducer which allows the registration of acoustic events generated during on load tap changers operation was selected.
The paper presents studies on the improvement and development of cooperation methods for cost optimization in power supply systems using polygeneration technology. A support for cooperating operators, which are respon...
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The integration of Web-Services, smart agents and “smart objects” enables enterprise innovation and competitiveness in a globalized economy. The paper proposes a multi view modelling framework that enables enterpris...
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The integration of Web-Services, smart agents and “smart objects” enables enterprise innovation and competitiveness in a globalized economy. The paper proposes a multi view modelling framework that enables enterprises to develop context-awareness and to achieve sustainable interoperability.
This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, calle...
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This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, called efficient fractal dimension (EFD), which is based on the remaining sequences is calculated. The discriminating capacity and the time efficiency of EFD are evaluated in comparison with fractal dimension (FD) computed by box counting both theoretically and empirically. The results revealed that EFD is better than FD for texture identification and classification.
The paper presents the concept of project life cycle optimization, which is based on the formalization of domain knowledge and decomposition of the controlled system into subsystems. The formalization of knowledge con...
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Tactile sensing plays an important role in robot hand manipulation. This papers presents an analysis of the raw values produced by a biomimetic tactile sensor and the proposed solution organized in a pipeline processi...
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Tactile sensing plays an important role in robot hand manipulation. This papers presents an analysis of the raw values produced by a biomimetic tactile sensor and the proposed solution organized in a pipeline processing structure to overcome the signal's noncompliances and issues for further processing. Even if this paper focuses on the data generated by the SynTouch BioTac sensor, the results and implemented modules can be applied to a wide range of tactile sensors.
The objective of this paper is to design a real-time control solution for chemical processes, namely the ethylene reactor, the key-installation in the petrochemical industry. The controller used is lag or lead control...
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The objective of this paper is to design a real-time control solution for chemical processes, namely the ethylene reactor, the key-installation in the petrochemical industry. The controller used is lag or lead controller, a simple yet suitable control tool. This article deals with the problem of finding all first order controllers that stabilize a given LTI continuous time or discrete time plant and attain various performance specifications. The main tool for the controller design is Neimarks D-decomposition, which was originally introduced in 1949 in the Russian control literature. The process data have been measured from an assembly of pyrolysis reactors on the petrochemical platform from Pitesti, Romania.
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