The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In wireless sensor networks (WSN), location information acquisition is critical to guarantee their performance. This paper presents a hybrid positioning method in WSN with high precision. Reference nodes transmit linear frequency modulation continuous wave (FMCW), general nodes estimate the range difference to reference nodes based on the received signals' frequency difference. The location information...
A microgrid is a controllable component of the smart grid defined as a part of distribution network capable of supplying its own local load even in the case of disconnection from the upstream network. Microgrids incorporate large amount of renewable and non-renewable distributed generation (DG) that are connected to the system either directly or by power electronics (PE) interface. The diversity of...
Efficient flood management requires accurate real time forecasts to allow early warnings, real time control of hydraulics structures or other actions. Commercially available computing tools typically use, for flow or level forecasting, hydraulic models derived from the numerical approximation of Saint-Venant equations. These tools need powerful computers, accurate knowledge of the riverbed topography...
We present a Nonlinear Model Predictive Control (NMPC) algorithm for real-time control of large-scale river networks in delta areas. The algorithm consists of an iterative, finite-horizon optimization of the system over a short-term control horizon. The underlying set of nonlinear internal process models represents relevant physical phenomena such as flow routing in the river network, and the dynamics...
The paper describes a specifically adapted optimization method to design the structure and to define the parameters of a central water management system (including local controllers) in a cascade of hydropower plants, with minimum design and realization efforts. The local controller and the central water management system are designed using a hydrodynamic-numerical model coupled with control algorithms,...
Freeway traffic state estimation is one of the central components in real-time traffic management and information applications. Recent studies show that the classic kinematic wave model can be formulated and solved more efficiently and accurately in Lagrangian (vehicle number-time) coordinates. This paper investigates the opportunities of the Lagrangian form for state estimation. The main advantage...
In order to improve the precision of navigation positioning, a more accurate solution of GPS positioning equations is required. A new algorithm is developed and improvement of existing algorithms has been made in this paper to improve the precision. For each algorithm, simulation is made respectively. Simulation results show that compared to old ones, the new algorithm can improve the solution precision...
The problem of satisfying constraints imposed on a dynamical system that operates under a load schedule is considered from the perspective of using model predictive control to set free inputs across time. We formulate an approach incorporating information about the schedule and identify conditions for when it is guaranteed to work. The proposed method is motivated and simulated within the context...
Open-channels networks used for water distribution are subject to algal developments that can induce major disturbances such as clogging issues on hydraulic devices (pipes, weirs, filters,...). We already studied the use of flushes to manage these algae developments. The flush is carried out by increasing the hydraulic shear conditions using the hydraulic structures of the canal network. In response...
Incorporating weather forecasts in the control of land surface water levels requires predicting the outcome of a control action. In Model-Predictive Control (MPC) such predictions are generated by a model of the water system. The actuators in this specific application typically cause discontinuities in this model. Avoiding complex solving techniques for such hybrid systems, this paper introduces an...
In order to provide safety against high sea water levels, in many low-lying countries on the one hand dunes are maintained at a certain safety level and dikes are built, while on the other hand large control structures that can be controlled dynamically are constructed. Currently, these structures are often operated purely locally, without coordination on actions between different structures. Automatically...
Sludge recycling system is an important part of wastewater treatment plants. Because of the lack of control model and ensure water quality, the sludge recycle flow rate is controlled by high percentage of the influent to the wastewater treatment plants generally, which result in high energy consumption and decreasing of handling capacity. At present, the artificial intelligence modeling technique...
The main canal of the middle route of South-to-North Water Transfer Project crosses four drainage areas and eight latitudes from south to north, almost across half of China in a north-south direction, and most part of the main canal is in the north of the Yellow River. Different degree of Ice freezing will occur from the north to the south in winter, and may cause disasters such as ice jamming and...
Hydraulic simulation models of water distribution networks (WDN) are routinely used for operational investigations and network design purposes. However, their full potential is often never realized because in the majority of cases, they have been calibrated with data collected manually from the field during a single historic time period and reflects the network operational conditions that were prevalent...
From the current research review and defects of the present leakage prediction model analysis, a multivariate grey GM (0, N) (Multi-factor Grey Model) considering the water supply pressure, water supply volume and frequency of leakage was proposed, finally it was used to predict the leakage of water pipe network, the results showed that the precision of grey GM (0, N) model was greatly improved in...
Environment protection and preservation is an in season issue today, more than ever before. It has become a critical concern as the climate change threatens the sustainability of human societies; in this context exploitation of any technological advance in protecting the environment is more than welcome. Wireless sensor network applications appear as a promising technology, very helpful to many environmental...
Model Predictive Control (MPC) has received wide attention from both the academic and industrial societies, mainly in the chemical industries, and is fast gaining popularity in Electro-Mechanical industrial systems. Great success stories of applications of MPC to industrial systems have been reported. However, the model based nature of this control methodology raises numerous questions of robustness,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.