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System Simulator (system + simulator)
Selected AbstractsRobust load,frequency regulation: A real-time laboratory experimentOPTIMAL CONTROL APPLICATIONS AND METHODS, Issue 6 2007Hassan Bevrani Abstract This paper addresses a new method for robust decentralized design of proportional-integral-based load,frequency control (LFC) with communication delays. In the proposed methodology, the LFC problem is reduced to a static output feedback control synthesis for a multiple delays power system, and then the control parameters are easily carried out using robust H, control technique. To demonstrate the efficiency of the proposed control strategy, an experimental study has been performed on the Analog Power System Simulator at the Research Laboratory of the Kyushu Electric Power Co. in Japan. Copyright © 2007 John Wiley & Sons, Ltd. [source] A study on a new AVR parameter tuning concept using on-line measured data with the real-time simulatorEUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 3 2006Joong-Moon Kim Abstract Automatic voltage regulator (AVR) parameter tuning for voltage control of power system generators has generally been performed with the analytic methods and the simulation methods, which mostly depend on off-line linear mathematical models of power system. However, due to the nonlinear nature of power system, the mathematical models of the excitation system may not be correct. So the excitation control system performances with the parameter set that is tuned by using the mathematical model, may not be appropriate for some operating conditions. This paper presents an AVR parameter tuning method using on-line measured data of the excitation control system with parameter optimization technique. As this method utilizes on-line operating data, it can overcome the limitation of model uncertainty problems of conventional method. To validate the proposed tuning concept, a scaled model excitation system is connected to the real-time power system simulator, and the proposed tuning concept is tested. Copyright © 2006 John Wiley & Sons, Ltd. [source] Opportunities for manipulating catchment water balance by changing vegetation type on a topographic sequence: a simulation studyHYDROLOGICAL PROCESSES, Issue 6 2008Enli Wang Abstract This simulation study explores opportunities to reduce catchment deep drainage through better matching land use with soil and topography, including the ,harvesting' (evapotranspiration) of excess water running on to lower land units. A farming system simulator was coupled with a catchment hydrological framework to enable analysis of climate variability and 11 different land-use options as they impact the catchment water balance. These land-use options were arranged in different configurations down a sequence of three hydrologically interconnected slope units (uphill, mid-slope and valley floor land units) in a subcatchment of Simmons Creek, southern New South Wales, Australia. With annual crops, the valley floor land units were predicted to receive 187 mm year,1 of run-on water in addition to annual rainfall in 1 in 10 years, and in excess of 94 mm year,1 in 1 in 4 years. In this valley floor position, predicted drainage averaged approximately 110 mm year,1 under annual crops and pastures, whereas permanent tree cover or perennial lucerne was predicted to reduce drainage by up to 99%. The planting of trees or lucerne on the valley floor units could ,harvest' run-on water, reducing drainage for the whole subcatchment with proportionately small reduction in land areas cropped. Upslope land units, even though often having shallower soil, will not necessarily be the most effective locations to plant perennial vegetation for the purposes of recharge reduction. Water harvesting opportunities are site specific, dependent on the amounts and frequency of flows of water to lower landscape units, the amounts and frequency of deep drainage on the different land units, the relative areas of the different land units, and interactions with land use in the different slope positions. Copyright © 2007 John Wiley & Sons, Ltd. [source] The concept of the gas turbine-based hybrid vehicle: system, design and configuration issuesINTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 9 2006Roberto Capata Abstract The object of this study is a theoretical and experimental analysis of a new hybrid propulsion system for a passenger sedan in which the thermal engine is a small gas turbine set. Some preliminary results on the possibility of replacing the conventional ICE of a hybrid ,series' configuration by a turbogas were presented and discussed in previous papers by the same authors: several possible designs were examined under both a thermodynamic and an operative point of view. This paper presents a summary of the project and constitutes an attempt to put things in a proper engineering perspective: the technical feasibility of the project is assessed via a calculation of the required mission loads, a preliminary design of the most important elements of the propulsive system, the choice of the mission control strategy and the implementation of a numerical system simulator. The experiments that provided a verification for the assumed component efficiencies were carried out, in cooperation with the Research Centre of ENEA-Casaccia, on an ELLIOTT TA-45 group. Our results, though only preliminary, allow for a direct comparison between a GT-hybrid vehicle and a modern diesel car, and indicate that the GT-hybrid may be actually a competitor for the FC-powered vehicle concept. Our ,optimal' configuration is a combination of a 100 kg battery pack and two turbogas set of 5 and 16 kW, respectively. Copyright © 2005 John Wiley & Sons, Ltd. [source] Advanced da Vinci surgical system simulator for surgeon training and operation planningTHE INTERNATIONAL JOURNAL OF MEDICAL ROBOTICS AND COMPUTER ASSISTED SURGERY, Issue 3 2007L. W. Sun Abstract Background Although patients benefit considerably from minimally invasive surgery, the use of new instruments such as robotic systems is challenging for surgeons, and extensive training is required. Method We developed a computer-based simulator of the da Vinci Surgical System, modelling the robot and designing a new interface. Results The simulator offers users a two-handed interface to control a realistic model of the da Vinci robot. The simulator can be applied (i) to provide an environment in which to practice simple surgical skills and (ii) to serve as a visualization platform on which to validate port placement and robot pose for operation planning. Conclusions Virtual reality is a useful technique for medical training. The simulator is currently in its early stages, but this preliminary work is promising. Copyright © 2007 John Wiley & Sons, Ltd. [source] | ||||||||||