In this document we show the evaluation of an already introduced handover management solution which can be used to provide ubiquitous connections and seamless Internet access. The new solution makes use of GNSS locati...
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In this document we show the evaluation of an already introduced handover management solution which can be used to provide ubiquitous connections and seamless Internet access. The new solution makes use of GNSS location information and previous records of network parameters. The method exploits the benefits of multihomed mobility configurations. Based on actual GNSS coordinates and previously recorded data, the system is able to predict handovers and to prepare itself for the appearance of networks. By implementing the proposed solution in a real-life multihomed test environment, handover latency is almost totally eliminated.
This paper describes the implementation of Wavelet Transform and Spectral Energy analysis on samples of simulated voltage and current waveforms obtained from PSCAD/EMTDC for each of the all possible fault scenarios in...
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This paper describes the implementation of Wavelet Transform and Spectral Energy analysis on samples of simulated voltage and current waveforms obtained from PSCAD/EMTDC for each of the all possible fault scenarios in a modeled 500 kV transmission network. The fault detection and classification of each fault scenarios is determined based on results of the voltage and current waveforms analysis in time and wavelet domains. The analysis is carried out including variation in fault types, inception angles and locations with a practically arbitrarily assumed fault duration. The analytical results shows that the described technique is highly dependable and is able to detect and classify different kinds of faults along a transmission line whatever is the fault type, inception angle and location.
This paper presents modeling of the 500 kV transmission line located between Bang-Saphan 2 (BSP2) and Chom-Bung (CBG) substations, Thailand. The network is modeled based on the transient simulation program- PSCAD/EMTD...
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This paper presents modeling of the 500 kV transmission line located between Bang-Saphan 2 (BSP2) and Chom-Bung (CBG) substations, Thailand. The network is modeled based on the transient simulation program- PSCAD/EMTDC. The equivalent circuit of BSP2 and CBG is obtained from the actual parameters. The initial condition parameters are verified by PSS/E, an electrical simulation program. After the modeling has been established, a fault analysis is done by using PSCAD/EMTDC in order to study the system response when fault constrains are applied. This paper has illustrated that how the information on the sampled voltage and current waveforms derived from PSCAD/EMDTC modeling and simulation can be used for fault detection, classification and location.
Automatic generation control (AGC) is one of the most profitable ancillary services of power systems. The main goal of AGC is to maintain zero steady state errors for frequency deviation and good tracking of load dema...
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Automatic generation control (AGC) is one of the most profitable ancillary services of power systems. The main goal of AGC is to maintain zero steady state errors for frequency deviation and good tracking of load demands in a power system. However, the system performance is often constrained by governor dead band nonlinearity. This paper addresses a sliding mode controller for a single area power system with governor dead band. Two RBF neural networks are employed in this presented method, where one network is designed to compensate the dead band and the other network is designed to approximate the output of the dead band. The weight update formulas of the two RBF networks are derived from Lyapunov direct method. Finally, simulation results show the feasibility of the presented method for the AGC problem of a single area power system.
A new cell voltage equalizer topology for future plug-in hybrid electric vehicles (PHEV) or renewable energy storage has been proposed in this paper. This topology has fewer components compared to the conventional top...
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A new cell voltage equalizer topology for future plug-in hybrid electric vehicles (PHEV) or renewable energy storage has been proposed in this paper. This topology has fewer components compared to the conventional topologies found in the literatures, and therefore, it could reduce cost and fabrication complexity. This new circuit is based on a time shared fly-back converter, and any number of series connected cells could be used in a string without any apparent issues. Each cell in a string shares this converter during its allocated time slot provided by the microcontroller. In addition, dynamic allocations of the time slots are possible to achieve faster cell balancing, and the circuit dynamically distributes depleted charge among cells in a regenerative fashion - ensuring a very high efficiency. The prototype of a four-cell lithium-ion battery balancer circuit was designed and implemented. Simulation and experimental results are presented to verify the operation of the new topology.
The multidelays linear control systems described by difference differential equations are often studied in modern control theory. In this paper, the delay-independent stabilization algebraic criteria and the theorem o...
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The multidelays linear control systems described by difference differential equations are often studied in modern control theory. In this paper, the delay-independent stabilization algebraic criteria and the theorem of delay-independent stabilization for linear systems with multiple time-delays are established by using the Lyapunov functional and the Riccati algebra matrix equation in the matrix theory. An illustrative example and the simulation result, show that the approach to linear systems with multiple time-delays is effective.
Based on the essential theory of bond graph, a novel modeling method which is called power transfer function is presented in this paper. This method has so many advantages: with this method we can set up the systems&#...
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Based on the essential theory of bond graph, a novel modeling method which is called power transfer function is presented in this paper. This method has so many advantages: with this method we can set up the systems' model easily; and the power transfer model is more visual than the bond graph model; it is more convenient than the bond graph model when emulated by the simulink of Matlab; it is easier to calculate the system's transfer function. This paper sets up the model to different power systems by both the bond graph and the power transfer function, the systems' transfer function results and the Matlab simulink results prove this power transfer function is valid and advanced.
In this paper, we propose a novel control framework for online dynamic resource assignment using a conjunctive and disjunctive rule-based Discrete Event controller (DEC). The framework includes an energy optimization ...
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In this paper, we propose a novel control framework for online dynamic resource assignment using a conjunctive and disjunctive rule-based Discrete Event controller (DEC). The framework includes an energy optimization model which is formulated by linear programming approach, and is solved online using commercial solvers. Dispatching rules are then fired based on the most energy-efficient workflow. Using an industrial case study, a simulation of the proposed energy-driven control framework is presented in the existence of resource degradation or failure. Simulation results show the effectiveness of online dynamic resource assignment in energy optimization with a reduction of 0.162 kWh per work-piece as compared to static resource assignment in existing control methods.
This paper investigates a robust fuzzy sliding mode control (FSMC) for the synchronization of chaotic systems. By using Lyapunov function the sliding surfaces are proposed for the chaotic system which is express by T-...
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This paper investigates a robust fuzzy sliding mode control (FSMC) for the synchronization of chaotic systems. By using Lyapunov function the sliding surfaces are proposed for the chaotic system which is express by T-S fuzzy model. The design is based on the concept of parallel distributed compensation (PDC). The designed sliding mode controller such that the global system confined on the sliding surfaces is asymptotically stable. The proposed controller can guarantee asymptotical synchronization of both drive and response systems. Finally, the corresponding numerical simulation results demonstrate the effectiveness of the proposed schemes.
To reduce energy consumption for sustainable and energy-efficient manufacturing, a good understanding of the dynamic energy consumption patterns on the manufacturing shop floor is essential. In this paper, we introduc...
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To reduce energy consumption for sustainable and energy-efficient manufacturing, a good understanding of the dynamic energy consumption patterns on the manufacturing shop floor is essential. In this paper, we introduce a novel approach to address the challenge of missing operation context information during in-situ energy data measurement. Finite-State Machines (FSMs) are used to model the engineering processes, and a two-stage framework for online classification of real time energy measurement data in terms of machine operation states is proposed for energy audit and machine management. The first stage uses advanced signal processing techniques to reduce noise while preserving important features, and the second stage uses intelligent pattern recognition algorithms to cluster energy consumption patterns. Our proposed two-stage framework is evaluated on an industrial injection moulding system using a Savizky-Golay (SG) filter and a Neural Network (NN), and our experimental results show a 95.85% accuracy in identification of machine operation states.
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